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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
<refentry id="function.PDO-exec">
<refnamediv>
<refname>PDO::exec</refname>
<refpurpose>
Execute an SQL statement and return the number of affected rows
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>PDO::exec</methodname>
<methodparam><type>string</type><parameter>statement</parameter></methodparam>
</methodsynopsis>
<para>
<function>PDO::exec</function> executes an SQL statement in
a single function call, returning the number of rows affected by the
statement.
</para>
<para>
<function>PDO::exec</function> does not return results from a SELECT
statement. For a SELECT statement that you only need to issue once
during your program, consider issuing <function>PDO::query</function>.
For a statement that you need to issue multiple times, prepare
a PDOStatement object with <function>PDO::prepare</function> and issue
the statement with <function>PDOStatement::execute</function>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>statement</parameter></term>
<listitem>
<para>
The SQL statement to prepare and execute.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
<function>PDO::exec</function> returns the number of rows that were modified
or deleted by the SQL statement you issued. If no rows were affected,
<function>PDO::exec</function> returns <literal>0</literal>.
</para>
&return.falseproblem;
<para>
The following example incorrectly relies on the return value of
<function>PDO::exec</function>, wherein a statement that affected 0 rows
results in a call to <function>die</function>:
<programlisting role="php">
<![CDATA[
<?php
$db->exec() or die($db->errorInfo());
?>
]]>
</programlisting>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Issuing a DELETE statement</title>
<para>
Count the number of rows deleted by a DELETE statement with no WHERE
clause.
</para>
<programlisting role="php">
<![CDATA[
<?php
$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
/* Delete all rows from the FRUIT table */
$count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'");
/* Return number of rows that were deleted */
print("Deleted $count rows.\n");
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Deleted 1 rows.
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>PDO::prepare</function></member>
<member><function>PDO::query</function></member>
<member><function>PDOStatement::execute</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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