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* Update pg-lo-create.xml * Update pg-lo-open.xml * Update pg-field-num.xml * Update pg-field-size.xml * Update pg-field-type.xml * Update pg-free-result.xml * Update pg-last-error.xml * Update pg-last-oid.xml * Update pg-lo-close.xml * Update pg-lo-export.xml * Update pg-lo-unlink.xml * Update pg-lo-read-all.xml * Update pg-lo-read.xml * Update pg-lo-read.xml
129 lines
3.2 KiB
XML
Executable File
129 lines
3.2 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: dallas Status: ready -->
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<!-- CREDITS: mowangjuanzi -->
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<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.74 -->
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<refentry xml:id="function.pg-lo-read" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>pg_lo_read</refname>
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<refpurpose>读取大对象</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 class="union"><type>string</type><type>false</type></type><methodname>pg_lo_read</methodname>
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<methodparam><type>PgSql\Lob</type><parameter>lob</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>8192</initializer></methodparam>
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</methodsynopsis>
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<para>
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<function>pg_lo_read</function> 从大对象中读取最多 <parameter>length</parameter> 字节的数据并以 <type>string</type> 返回。
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</para>
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<para>
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要使用大对象接口，必须将其封装在一个事务块中。
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</para>
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<note>
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<para>
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本函数以前的名字为 <function>pg_loread</function>。
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</para>
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</note>
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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>lob</parameter></term>
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<listitem>
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&pgsql.parameter.lob;
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>length</parameter></term>
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<listitem>
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<para>
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可选的要返回的最大字节数。
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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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包含来自大对象的 <parameter>length</parameter> 字节的 <type>string</type>，或错误时为 &false;。
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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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&pgsql.changelog.lob-object;
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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_lo_read</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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$doc_oid = 189762345;
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$database = pg_connect("dbname=jacarta");
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pg_query($database, "begin");
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$handle = pg_lo_open($database, $doc_oid, "r");
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$data = pg_lo_read($handle, 50000);
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pg_query($database, "commit");
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echo $data;
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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>pg_lo_read_all</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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