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db.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Db() — MongoDB Node.JS Driver 0.9.9.8 documentation</title>
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<div class="body">
<div class="section" id="db">
<h1>Db()<a class="headerlink" href="#db" title="Permalink to this headline">¶</a></h1>
<div class="section" id="constructor">
<h2>Constructor<a class="headerlink" href="#constructor" title="Permalink to this headline">¶</a></h2>
<p>Create a new Db instance.</p>
<blockquote>
<div><dl class="class">
<dt id="Db">
<em class="property">class </em><tt class="descname">Db</tt><big>(</big><big>)</big><a class="headerlink" href="#Db" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
<li><strong>databaseName</strong> (<em>string</em>) – name of the database.</li>
<li><strong>serverConfig</strong> (<em>object</em>) – server config object.</li>
<li><strong>[options]</strong> (<em>object</em>) – additional options for the collection.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</div></blockquote>
<dl class="docutils">
<dt>Options</dt>
<dd><ul class="first last simple">
<li><strong>strict</strong> {true | {w:n, wtimeout:n} | {fsync:true}, default:false}, execute insert with a getLastError command returning the result of the insert command.</li>
<li><strong>native_parser</strong> {Boolean, default:false}, use c++ bson parser.</li>
<li><strong>forceServerObjectId</strong> {Boolean, default:false}, force server to create _id fields instead of client.</li>
<li><strong>pkFactory</strong> {Object}, object overriding the basic ObjectID primary key generation.</li>
<li><strong>slaveOk</strong> {Boolean, default:false}, allow reads from secondaries.</li>
<li><strong>serializeFunctions</strong> {Boolean, default:false}, serialize functions.</li>
<li><strong>raw</strong> {Boolean, default:false}, peform operations using raw bson buffers.</li>
<li><strong>recordQueryStats</strong> {Boolean, default:false}, record query statistics during execution.</li>
<li><strong>reaper</strong> {Boolean, default:false}, enables the reaper, timing out calls that never return.</li>
<li><strong>reaperInterval</strong> {Number, default:10000}, number of miliseconds between reaper wakups.</li>
<li><strong>reaperTimeout</strong> {Number, default:30000}, the amount of time before a callback times out.</li>
<li><strong>retryMiliSeconds</strong> {Number, default:5000}, number of miliseconds between retries.</li>
<li><strong>numberOfRetries</strong> {Number, default:5}, number of retries off connection.</li>
</ul>
</dd>
</dl>
</div>
<div class="section" id="constants">
<h2>Constants<a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h2>
<table border="1" class="docutils">
<colgroup>
<col width="27%" />
<col width="18%" />
<col width="55%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Constant Name</th>
<th class="head">Value</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>Db.DEFAULT_URL</td>
<td>‘mongodb://localhost:27017/default’</td>
<td>Default URL</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="open">
<h2>open<a class="headerlink" href="#open" title="Permalink to this headline">¶</a></h2>
<p>Initialize the database connection.</p>
<dl class="function">
<dt>
<tt class="descname">open</tt><big>(</big><em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>callback</strong> (<em>function</em>) – returns index information.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of a simple single server db connection</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
</pre></div>
</div>
<p>Simple replicaset connection setup, requires a running replicaset on the correct ports</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="c1">// Replica configuration</span>
<span class="kd">var</span> <span class="nx">replSet</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ReplSetServers</span><span class="p">([</span>
<span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s1">'localhost'</span><span class="p">,</span> <span class="mi">30000</span><span class="p">,</span> <span class="p">{</span> <span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">true</span> <span class="p">}</span> <span class="p">),</span>
<span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s1">'localhost'</span><span class="p">,</span> <span class="mi">30001</span><span class="p">,</span> <span class="p">{</span> <span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">true</span> <span class="p">}</span> <span class="p">),</span>
<span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s1">'localhost'</span><span class="p">,</span> <span class="mi">30002</span><span class="p">,</span> <span class="p">{</span> <span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">true</span> <span class="p">}</span> <span class="p">)</span>
<span class="p">]</span>
<span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_test_'</span><span class="p">,</span> <span class="nx">replSet</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">p_db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="nx">p_db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="id1">
<h2>db<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>Create a new Db instance sharing the current socket connections.</p>
<dl class="function">
<dt>
<tt class="descname">db</tt><big>(</big><em>dbName</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>dbName</strong> (<em>string</em>) – the name of the database we want to use.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">db a db instance using the new database.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>Simple example connecting to two different databases sharing the socket connections below.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Reference a different database sharing the same connections</span>
<span class="c1">// for the data transfer</span>
<span class="kd">var</span> <span class="nx">secondDb</span> <span class="o">=</span> <span class="nx">db</span><span class="p">.</span><span class="nx">db</span><span class="p">(</span><span class="s2">"integration_tests_2"</span><span class="p">);</span>
<span class="c1">// Fetch the collections</span>
<span class="kd">var</span> <span class="nx">multipleColl1</span> <span class="o">=</span> <span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s2">"multiple_db_instances"</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">multipleColl2</span> <span class="o">=</span> <span class="nx">secondDb</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s2">"multiple_db_instances"</span><span class="p">);</span>
<span class="c1">// Write a record into each and then count the records stored</span>
<span class="nx">multipleColl1</span><span class="p">.</span><span class="nx">insert</span><span class="p">({</span><span class="nx">a</span><span class="o">:</span><span class="mi">1</span><span class="p">},</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">multipleColl2</span><span class="p">.</span><span class="nx">insert</span><span class="p">({</span><span class="nx">a</span><span class="o">:</span><span class="mi">1</span><span class="p">},</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Count over the results ensuring only on record in each collection</span>
<span class="nx">multipleColl1</span><span class="p">.</span><span class="nx">count</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">count</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">count</span><span class="p">);</span>
<span class="nx">multipleColl2</span><span class="p">.</span><span class="nx">count</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">count</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">count</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="close">
<h2>close<a class="headerlink" href="#close" title="Permalink to this headline">¶</a></h2>
<p>Close the current db connection, including all the child db instances. Emits close event if no callback is provided.</p>
<dl class="function">
<dt>
<tt class="descname">close</tt><big>(</big><em>[forceClose][, callback]</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>[forceClose]</strong> (<em>boolean</em>) – connection can never be reused.</li>
<li><strong>[callback]</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example that shows how to force close a db connection so it cannot be reused.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">1</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Fetch a collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'shouldCorrectlyFailOnRetryDueToAppCloseOfDb'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">collection</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Insert a document</span>
<span class="nx">collection</span><span class="p">.</span><span class="nx">insert</span><span class="p">({</span><span class="nx">a</span><span class="o">:</span><span class="mi">1</span><span class="p">},</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Force close the connection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">(</span><span class="kc">true</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Attemp to insert should fail now with correct message 'db closed by application'</span>
<span class="nx">collection</span><span class="p">.</span><span class="nx">insert</span><span class="p">({</span><span class="nx">a</span><span class="o">:</span><span class="mi">2</span><span class="p">},</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="s1">'db closed by application'</span><span class="p">,</span> <span class="nx">err</span><span class="p">.</span><span class="nx">message</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
<p>An example of a simple single server db connection and close function</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Close the connection with a callback that is optional</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="admin">
<h2>admin<a class="headerlink" href="#admin" title="Permalink to this headline">¶</a></h2>
<p>Access the Admin database</p>
<dl class="function">
<dt>
<tt class="descname">admin</tt><big>(</big><span class="optional">[</span><em>callback</em><span class="optional">]</span><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>[callback]</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">admin the admin db object.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>Example showing how to access the Admin database for admin level operations.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Use the admin database for the operation</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">admin</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">adminDb</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="collectionsinfo">
<h2>collectionsInfo<a class="headerlink" href="#collectionsinfo" title="Permalink to this headline">¶</a></h2>
<p>Returns a cursor to all the collection information.</p>
<dl class="function">
<dt id="collectionsInfo">
<tt class="descname">collectionsInfo</tt><big>(</big><span class="optional">[</span><em>collectionName</em><span class="optional">]</span>, <em>callback</em><big>)</big><a class="headerlink" href="#collectionsInfo" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>[collectionName]</strong> (<em>string</em>) – the collection name we wish to retrieve the information from.</li>
<li><strong>callback</strong> (<em>function</em>) – returns option results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of retrieveing the information of all the collections.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Create a collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">createCollection</span><span class="p">(</span><span class="s1">'test_collections_info'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">r</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Return the information of a single collection name</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collectionsInfo</span><span class="p">(</span><span class="s2">"test_collections_info"</span><span class="p">).</span><span class="nx">toArray</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">items</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">items</span><span class="p">.</span><span class="nx">length</span><span class="p">);</span>
<span class="c1">// Return the information of a all collections, using the callback format</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collectionsInfo</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">cursor</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Turn the cursor into an array of results</span>
<span class="nx">cursor</span><span class="p">.</span><span class="nx">toArray</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">items</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">items</span><span class="p">.</span><span class="nx">length</span> <span class="o">></span> <span class="mi">0</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">})</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="collectionnames">
<h2>collectionNames<a class="headerlink" href="#collectionnames" title="Permalink to this headline">¶</a></h2>
<p>Get the list of all collection names for the specified db</p>
<dl class="function">
<dt id="collectionNames">
<tt class="descname">collectionNames</tt><big>(</big><span class="optional">[</span><em>collectionName</em><span class="optional">]</span>, <em>callback</em><big>)</big><a class="headerlink" href="#collectionNames" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>[collectionName]</strong> (<em>string</em>) – the collection name we wish to filter by.</li>
<li><strong>callback</strong> (<em>function</em>) – returns option results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of retrieveing the collection names for a database.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Create a collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">createCollection</span><span class="p">(</span><span class="s1">'test_collections_info'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">r</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Return the information of a single collection name</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collectionNames</span><span class="p">(</span><span class="s2">"test_collections_info"</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">items</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">items</span><span class="p">.</span><span class="nx">length</span><span class="p">);</span>
<span class="c1">// Return the information of a all collections, using the callback format</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collectionNames</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">items</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">items</span><span class="p">.</span><span class="nx">length</span> <span class="o">></span> <span class="mi">0</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="collection">
<h2>collection<a class="headerlink" href="#collection" title="Permalink to this headline">¶</a></h2>
<p>Fetch a specific collection (containing the actual collection information)</p>
<dl class="docutils">
<dt>Options</dt>
<dd><ul class="first last simple">
<li><strong>safe</strong> {true | {w:n, wtimeout:n} | {fsync:true}, default:false}, executes with a getLastError command returning the results of the command on MongoDB.</li>
<li><strong>slaveOk</strong> {Boolean, default:false}, Allow reads from secondaries.</li>
<li><strong>serializeFunctions</strong> {Boolean, default:false}, serialize functions on the document.</li>
<li><strong>raw</strong> {Boolean, default:false}, perform all operations using raw bson objects.</li>
<li><strong>pkFactory</strong> {Object}, object overriding the basic ObjectID primary key generation.</li>
</ul>
</dd>
</dl>
<dl class="function">
<dt>
<tt class="descname">collection</tt><big>(</big><em>collectionName</em><span class="optional">[</span>, <em>options</em><span class="optional">]</span><span class="optional">[</span>, <em>callback</em><span class="optional">]</span><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>collectionName</strong> (<em>string</em>) – the collection name we wish to access.</li>
<li><strong>[options]</strong> (<em>object</em>) – returns option results.</li>
<li><strong>[callback]</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of retrieving a collection from a db using the collection function.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Grab a collection without a callback no safe mode</span>
<span class="kd">var</span> <span class="nx">col1</span> <span class="o">=</span> <span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">);</span>
<span class="c1">// Grab a collection with a callback but no safe operation</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">col2</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Grab a collection with a callback in safe mode, ensuring it exists (should fail as it's not created)</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">,</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">col3</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">err</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">);</span>
<span class="c1">// Create the collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">createCollection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Retry to get the collection, should work as it's now created</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">,</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">col3</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="collections">
<h2>collections<a class="headerlink" href="#collections" title="Permalink to this headline">¶</a></h2>
<p>Fetch all collections for the current db.</p>
<dl class="function">
<dt>
<tt class="descname">collections</tt><big>(</big><em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>callback</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of retrieving all collections for a db as Collection objects</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Create the collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">createCollection</span><span class="p">(</span><span class="s1">'test_correctly_access_collections'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Retry to get the collection, should work as it's now created</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">collections</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">collections</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">collections</span><span class="p">.</span><span class="nx">length</span> <span class="o">></span> <span class="mi">0</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="eval">
<h2>eval<a class="headerlink" href="#eval" title="Permalink to this headline">¶</a></h2>
<p>Evaluate javascript on the server</p>
<dl class="docutils">
<dt>Options</dt>
<dd><ul class="first last simple">
<li><strong>nolock</strong> {Boolean, default:false}, Tell MongoDB not to block on the evaulation of the javascript.</li>
</ul>
</dd>
</dl>
<dl class="function">
<dt>
<tt class="descname">eval</tt><big>(</big><em>code</em><span class="optional">[</span>, <em>parameters</em><span class="optional">]</span><span class="optional">[</span>, <em>options</em><span class="optional">]</span>, <em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>code</strong> (<em>code</em>) – javascript to execute on server.</li>
<li><strong>[parameters]</strong> (<em>object</em>) – the parameters for the call.</li>
<li><strong>[options]</strong> (<em>object</em>) – the options</li>
<li><strong>callback</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>A whole bunch of examples on how to use eval on the server.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">1</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Evaluate a function on the server with the parameter 3 passed in</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'function (x) {return x;}'</span><span class="p">,</span> <span class="p">[</span><span class="mi">3</span><span class="p">],</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a function on the server with the parameter 3 passed in no lock aquired for eval</span>
<span class="c1">// on server</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'function (x) {return x;}'</span><span class="p">,</span> <span class="p">[</span><span class="mi">3</span><span class="p">],</span> <span class="p">{</span><span class="nx">nolock</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a function on the server that writes to a server collection</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'function (x) {db.test_eval.save({y:x});}'</span><span class="p">,</span> <span class="p">[</span><span class="mi">5</span><span class="p">],</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Locate the entry</span>
<span class="nx">client</span><span class="p">.</span><span class="nx">collection</span><span class="p">(</span><span class="s1">'test_eval'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">collection</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">collection</span><span class="p">.</span><span class="nx">findOne</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">item</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">item</span><span class="p">.</span><span class="nx">y</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="c1">// Evaluate a function with 2 parameters passed in</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'function (x, y) {return x + y;}'</span><span class="p">,</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">],</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a function with no parameters passed in</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'function () {return 5;}'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a statement</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s1">'2 + 3;'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a statement using the code object</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="k">new</span> <span class="nx">Code</span><span class="p">(</span><span class="s2">"2 + 3;"</span><span class="p">),</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a statement using the code object including a scope</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="k">new</span> <span class="nx">Code</span><span class="p">(</span><span class="s2">"return i;"</span><span class="p">,</span> <span class="p">{</span><span class="s1">'i'</span><span class="o">:</span><span class="mi">2</span><span class="p">}),</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate a statement using the code object including a scope</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="k">new</span> <span class="nx">Code</span><span class="p">(</span><span class="s2">"i + 3;"</span><span class="p">,</span> <span class="p">{</span><span class="s1">'i'</span><span class="o">:</span><span class="mi">2</span><span class="p">}),</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="p">});</span>
<span class="c1">// Evaluate an illegal statement</span>
<span class="nx">db</span><span class="p">.</span><span class="nb">eval</span><span class="p">(</span><span class="s2">"5 ++ 5;"</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">err</span> <span class="k">instanceof</span> <span class="nb">Error</span><span class="p">);</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">ok</span><span class="p">(</span><span class="nx">err</span><span class="p">.</span><span class="nx">message</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">);</span>
<span class="c1">// Let's close the db</span>
<span class="nx">test</span><span class="p">.</span><span class="nx">done</span><span class="p">();</span>
<span class="p">});</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="nx">test</span><span class="p">.</span><span class="nx">done</span><span class="p">();</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="dereference">
<h2>dereference<a class="headerlink" href="#dereference" title="Permalink to this headline">¶</a></h2>
<p>Dereference a dbref, against a db</p>
<dl class="function">
<dt>
<tt class="descname">dereference</tt><big>(</big><em>dbRef</em>, <em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>dbRef</strong> (<em>dbref</em>) – db reference object we wish to resolve.</li>
<li><strong>callback</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of dereferencing values.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Get a second db</span>
<span class="kd">var</span> <span class="nx">secondDb</span> <span class="o">=</span> <span class="nx">db</span><span class="p">.</span><span class="nx">db</span><span class="p">(</span><span class="s1">'integration_tests_2'</span><span class="p">);</span>
<span class="c1">// Create a dereference example</span>
<span class="nx">secondDb</span><span class="p">.</span><span class="nx">createCollection</span><span class="p">(</span><span class="s1">'test_deref_examples'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">collection</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Insert a document in the collection</span>
<span class="nx">collection</span><span class="p">.</span><span class="nx">insert</span><span class="p">({</span><span class="s1">'a'</span><span class="o">:</span><span class="mi">1</span><span class="p">},</span> <span class="p">{</span><span class="nx">safe</span><span class="o">:</span><span class="kc">true</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">ids</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// Let's build a db reference and resolve it</span>
<span class="kd">var</span> <span class="nx">dbRef</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">DBRef</span><span class="p">(</span><span class="s1">'test_deref_examples'</span><span class="p">,</span> <span class="nx">ids</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">_id</span><span class="p">,</span> <span class="s1">'integration_tests_2'</span><span class="p">);</span>
<span class="c1">// Resolve it including a db resolve</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">dereference</span><span class="p">(</span><span class="nx">dbRef</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">item</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">item</span><span class="p">.</span><span class="nx">a</span><span class="p">);</span>
<span class="c1">// Let's build a db reference and resolve it</span>
<span class="kd">var</span> <span class="nx">dbRef</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">DBRef</span><span class="p">(</span><span class="s1">'test_deref_examples'</span><span class="p">,</span> <span class="nx">ids</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">_id</span><span class="p">);</span>
<span class="c1">// Simple local resolve</span>
<span class="nx">secondDb</span><span class="p">.</span><span class="nx">dereference</span><span class="p">(</span><span class="nx">dbRef</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">item</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">item</span><span class="p">.</span><span class="nx">a</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="logout">
<h2>logout<a class="headerlink" href="#logout" title="Permalink to this headline">¶</a></h2>
<p>Logout user from server, fire off on all connections and remove all auth info</p>
<dl class="function">
<dt>
<tt class="descname">logout</tt><big>(</big><em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>callback</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of using the logout command for the database.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Add a user to the database</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">addUser</span><span class="p">(</span><span class="s1">'user'</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Authenticate</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">authenticate</span><span class="p">(</span><span class="s1">'user'</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">true</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="c1">// Logout the db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">logout</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">true</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="authenticate">
<h2>authenticate<a class="headerlink" href="#authenticate" title="Permalink to this headline">¶</a></h2>
<p>Authenticate a user against the server.</p>
<dl class="function">
<dt>
<tt class="descname">authenticate</tt><big>(</big><em>username</em>, <em>password</em>, <em>callback</em><big>)</big></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
<li><strong>username</strong> (<em>string</em>) – username.</li>
<li><strong>password</strong> (<em>string</em>) – password.</li>
<li><strong>callback</strong> (<em>function</em>) – returns the results.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">null</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p><strong>Examples</strong></p>
<blockquote>
<div><p>An example of using the authenticate command.</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">Db</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Db</span><span class="p">,</span>
<span class="nx">Server</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Server</span><span class="p">,</span>
<span class="nx">ReplSetServers</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ReplSetServers</span><span class="p">,</span>
<span class="nx">ObjectID</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">ObjectID</span><span class="p">,</span>
<span class="nx">Binary</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Binary</span><span class="p">,</span>
<span class="nx">GridStore</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">GridStore</span><span class="p">,</span>
<span class="nx">Code</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">Code</span><span class="p">,</span>
<span class="nx">BSON</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'mongodb'</span><span class="p">).</span><span class="nx">pure</span><span class="p">().</span><span class="nx">BSON</span><span class="p">,</span>
<span class="nx">assert</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'assert'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">db</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Db</span><span class="p">(</span><span class="s1">'integration_tests'</span><span class="p">,</span> <span class="k">new</span> <span class="nx">Server</span><span class="p">(</span><span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="mi">27017</span><span class="p">,</span>
<span class="p">{</span><span class="nx">auto_reconnect</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="nx">poolSize</span><span class="o">:</span> <span class="mi">4</span><span class="p">}),</span> <span class="p">{</span><span class="nx">native_parser</span><span class="o">:</span> <span class="kc">false</span><span class="p">});</span>
<span class="c1">// Establish connection to db</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">db</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Add a user to the database</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">addUser</span><span class="p">(</span><span class="s1">'user'</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">err</span><span class="p">);</span>
<span class="c1">// Authenticate</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">authenticate</span><span class="p">(</span><span class="s1">'user'</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="kc">true</span><span class="p">,</span> <span class="nx">result</span><span class="p">);</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</pre></div>
</div>
</div></blockquote>
</div>
<div class="section" id="adduser">
<h2>addUser<a class="headerlink" href="#adduser" title="Permalink to this headline">¶</a></h2>
<p>Add a user to the database.</p>
<dl class="docutils">
<dt>Options</dt>