mirror of
https://github.com/php/doc-zh.git
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161 lines
4.6 KiB
XML
Executable File
161 lines
4.6 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 3f2e2d4a8c98368d8cd5dcf73d4728dfb4517f6d Maintainer: dallas Status: ready -->
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<!-- CREDITS: mowangjuanzi -->
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<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.7 -->
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<refentry xml:id="function.pg-trace" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>pg_trace</refname>
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<refpurpose>启用 PostgreSQL 连接的追踪</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>pg_trace</methodname>
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<methodparam><type>string</type><parameter>filename</parameter></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>mode</parameter><initializer>"w"</initializer></methodparam>
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<methodparam choice="opt"><type class="union"><type>PgSql\Connection</type><type>null</type></type><parameter>connection</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>trace_mode</parameter><initializer>0</initializer></methodparam>
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</methodsynopsis>
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<para>
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<function>pg_trace</function> 启用 PostgreSQL 前后端通讯的追踪并记录到文件。要完全理解结果，需要熟悉 PostgreSQL 通讯协议的内部工作原理。
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</para>
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<para>
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对不熟悉的人来说，追踪发送到服务器的查询错误依然有用，例如可以用 <command>grep '^To backend' trace.log</command> 来查看实际发送到 PostgreSQL
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服务器的查询。更多信息参考 <link xlink:href="&url.pgsql.manual;">PostgreSQL 手册</link>。
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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>filename</parameter></term>
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<listitem>
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<para>
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写入追踪日志的文件完整路径和文件名，与 <function>fopen</function> 一致。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>mode</parameter></term>
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<listitem>
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<para>
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可选的文件访问模式，同 <function>fopen</function>。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>connection</parameter></term>
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<listitem>
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&pgsql.parameter.connection-with-nullable-default;
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>trace_mode</parameter></term>
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<listitem>
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<para>
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可选的 trace 模式，使用下列常量 <constant>PGSQL_TRACE_SUPPRESS_TIMESTAMPS</constant> 和
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<constant>PGSQL_TRACE_REGRESS_MODE</constant>
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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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&return.success;
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>8.3.0</entry>
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<entry>
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新增 <parameter>trace_mode</parameter>。
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</entry>
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</row>
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&pgsql.changelog.connection-object;
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<row>
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<entry>8.0.0</entry>
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<entry>
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<parameter>connection</parameter> 现在可为 null。
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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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><function>pg_trace</function> 示例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$pgsql_conn = pg_connect("dbname=mark host=localhost");
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if ($pgsql_conn) {
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pg_trace('/tmp/trace.log', 'w', $pgsql_conn);
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pg_query("SELECT 1");
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pg_untrace($pgsql_conn);
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// Now /tmp/trace.log will contain backend communication
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} else {
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print pg_last_error($pgsql_conn);
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exit;
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}
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?>
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]]>
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</programlisting>
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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><function>fopen</function></member>
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<member><function>pg_untrace</function></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:"~/.phpdoc/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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