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odbc:sql_query(S, "SELECT {fn CURDATE()}").
{selected,[[]],[{"2012-10-02"}]} 1
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{selected …">
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<header>
<h1 class="entry-title"><a href="/blog/2012/07/02/odbc-sql/">ODBC, MS SQL Server and Erlang</a></h1>
<p class="meta">
<time datetime="2012-07-02T19:12:00+04:00" pubdate data-updated="true">Jul 2<span>nd</span>, 2012</time>
</p>
</header>
<div class="entry-content"><h2>Date and time</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>odbc:sql_query(S, "SELECT {fn CURDATE()}").
</span><span class='line'>{selected,[[]],[{"2012-10-02"}]}</span></code></pre></td></tr></table></div></figure>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>odbc:sql_query(S, "SELECT getdate()").
</span><span class='line'>{selected,[[]],[{ {{2012,10,23},{2,6,37}} }]}</span></code></pre></td></tr></table></div></figure>
<p><code>{{2012,10,23},{2,6,37}}</code> has a type <code>sql_datetime</code>.</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2012/07/02/odbc/">Install ODBC and MS SQL Server Client for Erlang</a></h1>
<p class="meta">
<time datetime="2012-07-02T19:12:00+04:00" pubdate data-updated="true">Jul 2<span>nd</span>, 2012</time>
</p>
</header>
<div class="entry-content"><p>Here we are connecting to MS SQL Server 2008 on MS Windows XP from Erlang on Debian Linux.</p>
<h2>Part 1</h2>
<p>Install utilities (FreeTDS SQL client):</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'># apt-get freetds-bin freetds-dev</span></code></pre></td></tr></table></div></figure>
<p>Try to connect with the <code>tsql</code> command from the <code>freetds-bin</code> package:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>tsql -H %ip_address_or_hostname% -p %port_number% -U %username% -P %password%</span></code></pre></td></tr></table></div></figure>
<p>or (with actual values for me):</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ tsql -H PI -p 1433 -U test -P test
</span><span class='line'>locale is "en_US.UTF-8"
</span><span class='line'>locale charset is "UTF-8"
</span><span class='line'>using default charset "UTF-8"
</span><span class='line'>1>
</span></code></pre></td></tr></table></div></figure>
<p>If you see the counter (1, 2, 3, …), most likely tsql is unable to connect to
the indicated server. Check the firewall’s settings.</p>
<p><code>sqsh</code> is an alternative for <code>tsql</code> (more powerful).</p>
<h2>Part 2</h2>
<p>Install the ODBC client driver.</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>apt-get install tdsodbc</span></code></pre></td></tr></table></div></figure>
<h2>Problems? Part 2a</h2>
<p><code>tdsodbc</code> uses <code>unixodbc</code> library, that conflicts with <code>libiodbc2</code>. <code>libiodbc2</code>
is a dependency for soprano, that is a dependency for the most of KDE applications.</p>
<p>So, you cannot use the KDE and UnixODBC in Debian (the bug from 2011 year).</p>
<p>This conflict can be fixed, downloading the patched versions of the packages from
here:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>http://packages.ubuntu.com/precise/libsoprano4
</span><span class='line'>http://packages.ubuntu.com/precise/i386/soprano-daemon</span></code></pre></td></tr></table></div></figure>
<p>If you don’t use KDE or the bug was fixed, skip this step.</p>
<h2>Part 3</h2>
<p>Update the config files:</p>
<p>/etc/odbc.ini</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>[odbc-test]
</span><span class='line'>Description = test
</span><span class='line'>Driver = ms-sql
</span><span class='line'>Servername = odbc-test
</span><span class='line'>UID = test
</span><span class='line'>Database = test_db
</span><span class='line'>Port = 1433</span></code></pre></td></tr></table></div></figure>
<p>/etc/odbcinst.ini</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>[ms-sql]
</span><span class='line'>Description = TDS connection
</span><span class='line'>Driver = /usr/lib/i386-linux-gnu/odbc/libtdsodbc.so
</span><span class='line'>Setup = /usr/lib/i386-linux-gnu/odbc/libtdsS.so
</span><span class='line'>UsageCount = 1
</span><span class='line'>FileUsage = 1</span></code></pre></td></tr></table></div></figure>
<p>Test it:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$isql -v odbc-test test test
</span><span class='line'>SQL></span></code></pre></td></tr></table></div></figure>
<h2>Part 4</h2>
<p>Try it from Erlang:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>1> odbc:start().
</span><span class='line'>ok
</span><span class='line'>2> {ok, S} = odbc:connect("DSN=odbc-test;UID=test;PWD=test", []).
</span><span class='line'>{ok,<0.44.0>}
</span><span class='line'>3> odbc:sql_query(S, "SELECT 1").
</span><span class='line'>{selected,[[]],[{1}]}</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2012/07/02/dialyzer/">Dialyzer</a></h1>
<p class="meta">
<time datetime="2012-07-02T19:12:00+04:00" pubdate data-updated="true">Jul 2<span>nd</span>, 2012</time>
</p>
</header>
<div class="entry-content"><p>Dializer is a static analysis tool.
It uses Persistent Lookup Table for storing information.
First of all, we need to build PLT:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>dialyzer --build_plt --apps erts kernel stdlib
</span></code></pre></td></tr></table></div></figure>
<p>It is time for a cup of coffee, because it will take about 20 minutes.
Fortunately, it can be called only once.</p>
<p>The next step is only 3-minutes long, but it will be called regularly.
This command will show the errors:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>dialyzer -n -nn -pa ../xapian/ebin -pa deps/seqbind/ebin/ -pa
</span><span class='line'>deps/erlando/ebin/ -pa deps/parse_trans/ebin/ --src src/ deps/erlando/src/
</span><span class='line'>deps/poolboy/src/
</span></code></pre></td></tr></table></div></figure>
<p>The parameters are:</p>
<ul>
<li><code>-n</code> Skip the plt check when running Dialyzer. Useful when working with
installed plts that never change.</li>
</ul>
<p>It saves few seconds.</p>
<ul>
<li><code>-nn</code> Bypass the native code compilation of some key files that Dialyzer
heuristically performs when dialyzing many files; this avoids the
compilation time but it may result in (much) longer analysis time.</li>
</ul>
<p>The native code compilation is slow. So, add this parameter to save time.</p>
<ul>
<li><p><code>-pa</code> This parameter adds the code for parse transforms.</p></li>
<li><p><code>--src</code> Add the source code and few dependencies to analyze.</p></li>
</ul>
<p>The errors in dependencies will be also shown.</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2012/06/15/pipes/">Pipes</a></h1>
<p class="meta">
<time datetime="2012-06-15T18:23:00+04:00" pubdate data-updated="true">Jun 15<span>th</span>, 2012</time>
</p>
</header>
<div class="entry-content"><h1>Using Xapian through a pipe</h1>
<p>To avoid linking with Xapian you can use a port:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='erlang'><span class='line'><span class="nn">xapian_server</span><span class="p">:</span><span class="n">open</span><span class="p">(</span><span class="nv">Path</span><span class="p">,</span> <span class="p">[</span><span class="n">port</span><span class="p">]).</span>
</span></code></pre></td></tr></table></div></figure>
<p>C-port allows to use Erlang VM and Xapian in different memory spaces.
If a port crashes, Erlang VM will be still alive.</p>
<p>But I think, it does not help to avoid GPL restrictions:
the whole program will be a derivative work.</p>
<p>GPL is a sly license. :)</p>
</div>
</article>
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<a href="/blog/archives">Blog Archives</a>
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<section>
<h1>Recent Posts</h1>
<ul id="recent_posts">
<li class="post">
<a href="/blog/2012/07/02/odbc-sql/">ODBC, MS SQL Server and Erlang</a>
</li>
<li class="post">
<a href="/blog/2012/07/02/odbc/">Install ODBC and MS SQL Server client for Erlang</a>
</li>
<li class="post">
<a href="/blog/2012/07/02/dialyzer/">Dialyzer</a>
</li>
<li class="post">
<a href="/blog/2012/06/15/pipes/">Pipes</a>
</li>
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