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archived-doc-zh/reference/pgsql/functions/pg-query.xml
Dallas Wang 9a2f55cb0a Correct Line-endings.
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<?xml version="1.0" encoding="gb2312"?>
<!-- $Revision: 1.2 $ -->
<!-- $Author: dallas $ -->
<!-- EN-Revision: 1.3 Maintainer: dallas Status: ready -->
<refentry id="function.pg-query">
<refnamediv>
<refname>pg_query</refname>
<refpurpose>执行查询</refpurpose>
</refnamediv>
<refsect1>
<title>说明</title>
<methodsynopsis>
<type>resource</type><methodname>pg_query</methodname>
<methodparam><type>resource</type><parameter>connection</parameter></methodparam>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
</methodsynopsis>
<para>
<function>pg_query</function> 在查询可以执行时返回查询结果资源号。如果查询失败或者提供的连接号无效则返回 &false;。如果连接号有效,则可以用 <function>pg_last_error</function> 函数来提取详细的错误信息。<function>pg_last_error</function> 发送一条 SQL 语句到 <parameter>connection</parameter> 资源指定的 PostgreSQL 数据库。<parameter>connection</parameter> 必须是由 <function>pg_connect</function><function>pg_pconnect</function> 返回的合法连接号。本函数返回值是一个其它 PostgreSQL 函数例如 <function>pg_fetch_array</function> 可以用来访问查询结果的查询结果资源号。
<note>
<simpara>
<parameter>connection</parameter><function>pg_query</function> 中的可选参数。如果没有指定 <parameter>connection</parameter>,则使用默认连接。默认连接是 <function>pg_connect</function><function>pg_pconnect</function> 所打开的最后一个连接。
</simpara>
<simpara>
尽管 <parameter>connection</parameter> 参数可以省略,但不推荐这样做。因为这样可能会导致很难发现脚本中的错误。
</simpara>
</note>
</para>
<note>
<para>
本函数以前的名字为 <literal>pg_exec()</literal><literal>pg_exec()</literal> 函数为了兼容性的原因仍然可以使用,但是鼓励用户使用新的名字。
</para>
</note>
<para>
参见 <function>pg_connect</function><function>pg_pconnect</function><function>pg_fetch_array</function><function>pg_fetch_object</function><function>pg_num_rows</function><function>pg_affected_rows</function>
</para>
</refsect1>
</refentry>
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