<?xml version="1.0" encoding="utf-8"?>

<!-- $Revision$ -->

<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: dallas Status: ready -->

<!-- CREDITS: mowangjuanzi -->

<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->

<refentry xml:id="function.pg-last-error" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>pg_last_error</refname>

<refpurpose>得到某连接的最后一条错误信息</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>string</type><methodname>pg_last_error</methodname>

<methodparam choice="opt"><type class="union"><type>PgSql\Connection</type><type>null</type></type><parameter>connection</parameter><initializer>&null;</initializer></methodparam>

</methodsynopsis>

<para>

<function>pg_last_error</function> 返回指定 <parameter>connection</parameter> 的最后一条错误信息。

</para>

<para>

错误信息可能会被调用的 PostgreSQL(libpq) 内部函数覆盖。如果 PostgreSQL 的内部模块函数产生了多个错误，则可能不能返回适当的错误信息。

</para>

<para>

使用 <function>pg_result_error</function>、<function>pg_result_error_field</function>、<function>pg_result_status</function>

和 <function>pg_connection_status</function> 用于更好的错误处理。

</para>

<note>

<para>

本函数以前的名字为 <function>pg_errormessage</function>。

</para>

</note>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>connection</parameter></term>

<listitem>

&pgsql.parameter.connection-with-nullable-default;

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

<type>string</type>，包含指定 <parameter>connection</parameter> 的最后一条错误消息。

</para>

</refsect1>

<refsect1 role="changelog">

&reftitle.changelog;

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

&pgsql.changelog.connection-object;

<row>

<entry>8.0.0</entry>

<entry>

<parameter>connection</parameter> 现在可为 null。

</entry>

</row>

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title><function>pg_last_error</function> 示例</title>

<programlisting role="php">

<![CDATA[

<?php

$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

// 查询失败

$res = pg_query($dbconn, "select * from doesnotexist");

echo pg_last_error($dbconn);

?>

]]>

</programlisting>

</example>

</para>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><function>pg_result_error</function></member>

<member><function>pg_result_error_field</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

-->