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git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@117801 c90b9560-bf6c-de11-be94-00142212c4b1
102 lines
3.3 KiB
XML
Executable File
102 lines
3.3 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.3 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.7 Maintainer: dallas Status: ready -->
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<refentry id="function.pg-fetch-array">
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<refnamediv>
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<refname>pg_fetch_array</refname>
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<refpurpose>提取一行作为数组</refpurpose>
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</refnamediv>
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<refsect1>
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<title>说明</title>
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<methodsynopsis>
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<type>array</type><methodname>pg_fetch_array</methodname>
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<methodparam><type>resource</type><parameter>result</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>row</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>result_type</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>pg_fetch_array</function> 返回一个与所提取的行（tuples/records）相一致的数组。如果如果没有更多行可供提取，则返回 &false;。
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</para>
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<para>
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<function>pg_fetch_array</function> 是 <function>pg_fetch_row</function> 的扩展版本。在返回的数组中不仅以数字索引方式存放数据（字段编号），默认情况下还用字段名做索引存放数据（字段名）。
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</para>
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<para>
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<parameter>row</parameter> 是想要取得的行（记录）的编号。第一行为 0。
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</para>
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<para>
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<parameter>result_type</parameter> 是可选参数，控制着怎样初始化返回值。<parameter>result_type</parameter>
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是一个常量，可以有以下取值：<constant>PGSQL_ASSOC</constant>，<constant>PGSQL_NUM</constant>
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和 <constant>PGSQL_BOTH</constant>。取值为 <constant>PGSQL_ASSOC</constant> 时
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<function>pg_fetch_array</function> 返回用字段名作为键值索引的关联数组，取值为
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<constant>PGSQL_NUM</constant> 时用字段编号作为键值，取值为
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<constant>PGSQL_BOTH</constant> 时则同时用两者作为键值。默认值是 <constant>PGSQL_BOTH</constant>。
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<note>
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<para>
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<parameter>result_type</parameter> 是在 PHP 4.0 中才加入的参数。
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</para>
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</note>
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</para>
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<para>
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<function>pg_fetch_array</function> 并不明显比使用 <function>pg_fetch_row</function> 慢，而且在使用中提供了更大的方便。
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</para>
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<para>
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<example>
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<title>PostgreSQL fetch array</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$conn = pg_pconnect ("dbname=publisher");
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if (!$conn) {
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echo "An error occured.\n";
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exit;
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}
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$result = pg_query ($conn, "SELECT * FROM authors");
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if (!$result) {
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echo "An error occured.\n";
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exit;
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}
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$arr = pg_fetch_array ($result, 0, PGSQL_NUM);
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echo $arr[0] . " <- array\n";
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$arr = pg_fetch_array ($result, 1, PGSQL_ASSOC);
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echo $arr["author"] . " <- array\n";
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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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<para>
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参见 <function>pg_fetch_row</function> 和 <function>pg_fetch_object</function> 以及 <function>pg_fetch_result</function>。
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</para>
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<note>
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<para>
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从 4.1.0 开始，<parameter>row</parameter> 成为可选参数。每次调用 <function>pg_fetch_array</function>，内部的行计数器都会加一。
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</para>
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</note>
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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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