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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<refentry id="function.mysqli-query">
<refnamediv>
<refname>mysqli_query</refname>
<refname>mysqli->query</refname>
<refpurpose>Performs a query on the database</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>mixed</type><methodname>mysqli_query</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
<methodparam choice='opt'><type>int</type><parameter>resultmode</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (method):</para>
<classsynopsis>
<ooclass><classname>mysqli</classname></ooclass>
<methodsynopsis>
<type>mixed</type><methodname>query</methodname>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
<methodparam choice='opt'><type>int</type><parameter>resultmode</parameter></methodparam>
</methodsynopsis>
</classsynopsis>
<para>
The <function>mysqli_query</function> function is used to simplify the
act of performing a query against the database represented by the
<parameter>link</parameter> parameter.
</para>
<para>
Functionally, using this
function is identical to calling <function>mysqli_real_query</function>
followed either by <function>mysqli_use_result</function> or
<function>mysqli_store_result</function> where <parameter>query</parameter>
is the query string itself and <parameter>resultmode</parameter> is
either the constant <literal>MYSQLI_USE_RESULT</literal> or
<literal>MYSQLI_STORE_RESULT</literal> depending
on the desired behavior. By default, if the
<parameter>resultmode</parameter> is not provided
<literal>MYSQLI_STORE_RESULT</literal> is used.
</para>
<para>
If you execute <function>mysqli_query</function> with <parameter>resultmode</parameter>
<literal>MYSQLI_USE_RESULT</literal> all subsequent calls will return error
<literal>Commands out of sync</literal> unless you call <function>mysqli_free_result</function>.
</para>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
&return.success; For <literal>SELECT, SHOW, DESCRIBE</literal> or
<literal>EXPLAIN</literal> <function>mysqli_query</function> will return
a result object.
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_real_query</function>,
<function>mysqli_multi_query</function>&listendand;
<function>mysqli_free_result</function>.
</para>
</refsect1>
<refsect1>
&reftitle.examples;
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", $result->num_rows);
/* free result set */
$result->close();
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!$mysqli->query("SET @a:='this will not work'")) {
printf("Error: %s\n", $mysqli->error);
}
$result->close();
}
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */
mysqli_free_result($result);
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Error: %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
Table myCity successfully created.
Select returned 10 rows.
Error: Commands out of sync; You can't run this command now
]]>
</screen>
</refsect1>
</refentry>
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