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https://github.com/sigmasternchen/php-doc-en
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# Also rollback a change that shouldn't have make it in the last commit git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@226684 c90b9560-bf6c-de11-be94-00142212c4b1
140 lines
3.6 KiB
XML
140 lines
3.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.10 $ -->
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<refentry id="function.PDO-exec">
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<refnamediv>
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<refname>PDO->exec()</refname>
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<refpurpose>
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Execute an SQL statement and return the number of affected rows
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<classsynopsis>
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<ooclass><classname>PDO</classname></ooclass>
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<methodsynopsis>
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<type>int</type><methodname>exec</methodname>
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<methodparam><type>string</type><parameter>statement</parameter></methodparam>
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</methodsynopsis>
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</classsynopsis>
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<para>
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<xref linkend="function.PDO-exec" /> executes an SQL statement in
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a single function call, returning the number of rows affected by the
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statement.
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</para>
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<para>
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<xref linkend="function.PDO-exec" /> does not return results from a SELECT
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statement. For a SELECT statement that you only need to issue once
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during your program, consider issuing <xref linkend="function.PDO-query" />.
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For a statement that you need to issue multiple times, prepare
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a PDOStatement object with <xref linkend="function.PDO-prepare" /> and issue
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the statement with <xref linkend="function.PDOStatement-execute" />.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>statement</parameter></term>
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<listitem>
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<para>
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The SQL statement to prepare and execute.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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<xref linkend="function.PDO-exec" /> returns the number of rows that were modified
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or deleted by the SQL statement you issued. If no rows were affected,
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<xref linkend="function.PDO-exec" /> returns <literal>0</literal>.
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</para>
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&return.falseproblem;
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<para>
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The following example incorrectly relies on the return value of
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<xref linkend="function.PDO-exec" />, wherein a statement that affected 0 rows
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results in a call to <function>die</function>:
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<programlisting role="php">
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<![CDATA[
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<?php
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$db->exec() or die($db->errorInfo());
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?>
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]]>
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</programlisting>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Issuing a DELETE statement</title>
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<para>
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Count the number of rows deleted by a DELETE statement with no WHERE
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clause.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
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/* Delete all rows from the FRUIT table */
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$count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'");
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/* Return number of rows that were deleted */
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print("Deleted $count rows.\n");
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Deleted 1 rows.
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="function.PDO-prepare" /></member>
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<member><xref linkend="function.PDO-query" /></member>
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<member><xref linkend="function.PDOStatement-execute" /></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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