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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
<?xml version='1.0' encoding="utf-8"?>
<!-- $Revision: 297078 $ -->
<refentry xml:id="pdostatement.bindcolumn" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>PDOStatement->bindColumn</refname>
<refpurpose>
Bind a column to a PHP variable
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>PDOStatement::bindColumn</methodname>
<methodparam><type>mixed</type><parameter>column</parameter></methodparam>
<methodparam><type>mixed</type><parameter role="reference">param</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>type</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>maxlen</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>driverdata</parameter></methodparam>
</methodsynopsis>
<para>
<function>PDOStatement::bindColumn</function> arranges to have a
particular variable bound to a given column in the result-set from a
query. Each call to <function>PDOStatement::fetch</function> or
<function>PDOStatement::fetchAll</function> will update all the variables
that are bound to columns.
</para>
<note>
<para>
Since information about the columns is not always available to PDO until
the statement is executed, portable applications should call this
function <emphasis>after</emphasis> <function>PDOStatement::execute</function>.
</para>
<para>
However, to be able to bind a LOB column as a stream when using the
<emphasis>PgSQL driver</emphasis>, applications should call this method
<emphasis>before</emphasis> calling <function>PDOStatement::execute</function>,
otherwise the large object OID will be returned as an integer.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>column</parameter></term>
<listitem>
<para>
Number of the column (1-indexed) or name of the column in the result set.
If using the column name, be aware that the name should match the
case of the column, as returned by the driver.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>param</parameter></term>
<listitem>
<para>
Name of the PHP variable to which the column will be bound.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>type</parameter></term>
<listitem>
<para>
Data type of the parameter, specified by the PDO::PARAM_* constants.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>maxlen</parameter></term>
<listitem>
<para>
A hint for pre-allocation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>driverdata</parameter></term>
<listitem>
<para>
Optional parameter(s) for the driver.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Binding result set output to PHP variables</title>
<para>
Binding columns in the result set to PHP variables is an effective
way to make the data contained in each row immediately available to
your application. The following example demonstrates how PDO allows
you to bind and retrieve columns with a variety of options and with
intelligent defaults.
</para>
<programlisting role="php">
<![CDATA[
<?php
function readData($dbh) {
$sql = 'SELECT name, colour, calories FROM fruit';
try {
$stmt = $dbh->prepare($sql);
$stmt->execute();
/* Bind by column number */
$stmt->bindColumn(1, $name);
$stmt->bindColumn(2, $colour);
/* Bind by column name */
$stmt->bindColumn('calories', $cals);
while ($row = $stmt->fetch(PDO::FETCH_BOUND)) {
$data = $name . "\t" . $colour . "\t" . $cals . "\n";
print $data;
}
}
catch (PDOException $e) {
print $e->getMessage();
}
}
readData($dbh);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
apple red 150
banana yellow 175
kiwi green 75
orange orange 150
mango red 200
strawberry red 25
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>PDOStatement::execute</function></member>
<member><function>PDOStatement::fetch</function></member>
<member><function>PDOStatement::fetchAll</function></member>
<member><function>PDOStatement::fetchColumn</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- 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
-->
|
