-
Notifications
You must be signed in to change notification settings - Fork 715
/
objectid.xml
153 lines (134 loc) · 4.64 KB
/
objectid.xml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<reference xml:id="class.mongodb-bson-objectid" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
<title>The MongoDB\BSON\ObjectId class</title>
<titleabbrev>MongoDB\BSON\ObjectId</titleabbrev>
<partintro>
<!-- {{{ MongoDB\BSON\ObjectId intro -->
<section xml:id="mongodb-bson-objectid.intro">
&reftitle.intro;
<para>
BSON type for an
<link xlink:href="&url.mongodb.docs.bson;#objectid">ObjectId</link>. The
value consists of 12 bytes, where the first four bytes are a timestamp
that reflect the ObjectId's creation. Specifically, the value consists of:
</para>
<itemizedlist>
<listitem><simpara>a 4-byte value representing the seconds since the Unix epoch,</simpara></listitem>
<listitem><simpara>a 5-byte random number unique to a machine and process, and</simpara></listitem>
<listitem><simpara>a 3-byte counter, starting with a random value.</simpara></listitem>
</itemizedlist>
<para>
In MongoDB, each document stored in a collection requires a unique
<literal>_id</literal> field that acts as a primary key. If an inserted
document omits the <literal>_id</literal> field, the extension automatically
generates an ObjectId for the <literal>_id</literal> field.
</para>
<para>
Using ObjectIds for the <literal>_id</literal> field provides the following
additional benefits:
</para>
<itemizedlist>
<listitem><simpara>The creation time of the ObjectId may be accessed using the <methodname>MongoDB\BSON\ObjectId::getTimestamp</methodname> method.</simpara></listitem>
<listitem><simpara>Sorting on an <literal>_id</literal> field that stores ObjectId values is roughly equivalent to sorting by creation time.</simpara></listitem>
</itemizedlist>
</section>
<!-- }}} -->
<section xml:id="mongodb-bson-objectid.synopsis">
&reftitle.classsynopsis;
<!-- {{{ Synopsis -->
<classsynopsis>
<ooclass><classname>MongoDB\BSON\ObjectId</classname></ooclass>
<!-- {{{ Class synopsis -->
<classsynopsisinfo>
<modifier>final</modifier>
<ooclass>
<classname>MongoDB\BSON\ObjectId</classname>
</ooclass>
<oointerface>
<interfacename>MongoDB\BSON\ObjectIdInterface</interfacename>
</oointerface>
<oointerface>
<interfacename>MongoDB\BSON\Type</interfacename>
</oointerface>
<oointerface>
<interfacename>Serializable</interfacename>
</oointerface>
<oointerface>
<interfacename>JsonSerializable</interfacename>
</oointerface>
<oointerface>
<interfacename>Stringable</interfacename>
</oointerface>
</classsynopsisinfo>
<!-- }}} -->
<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.mongodb-bson-objectid')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[not(@role='procedural')])" />
</classsynopsis>
<!-- }}} -->
</section>
<section role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>PECL mongodb 1.12.0</entry>
<entry>
Implements <interfacename>Stringable</interfacename> for PHP 8.0+.
</entry>
</row>
<row>
<entry>PECL mongodb 1.3.0</entry>
<entry>
<para>
Renamed from <literal>MongoDB\BSON\ObjectID</literal> to
<literal>MongoDB\BSON\ObjectId</literal>.
</para>
<para>
Implements <interfacename>MongoDB\BSON\ObjectIdInterface</interfacename>.
</para>
</entry>
</row>
<row>
<entry>PECL mongodb 1.2.0</entry>
<entry>
Implements <interfacename>Serializable</interfacename> and
<interfacename>JsonSerializable</interfacename>.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</section>
</partintro>
&reference.mongodb.bson.entities.objectid;
</reference>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->