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魔王卷子
077a542f80
* Update pg-delete.xml * Update pg-end-copy.xml * Update pg-escape-bytea.xml * Update pg-escape-string.xml * Update pg-escape-string.xml * Update pg-fetch-all.xml * Update pg-delete.xml * Update pg-delete.xml * Update pg-escape-bytea.xml * Update pg-escape-string.xml * Update pg-fetch-all.xml
138 lines
3.8 KiB
XML
Executable File
138 lines
3.8 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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<refentry xml:id='function.pg-escape-bytea' xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>pg_escape_bytea</refname>
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<refpurpose>
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转义字符串以插入到 bytea 字段
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</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>string</type><methodname>pg_escape_bytea</methodname>
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<methodparam choice="opt"><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
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<methodparam><type>string</type><parameter>data</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>pg_escape_bytea</function> 转义 bytea 数据类型的字符串。返回转义后的字符串。
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</para>
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<note>
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<para>
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当 <literal>SELECT</literal> bytea 类型时，PostgreSQL 返回前缀为“\”的八进制字节值（例如 \032）。用户需要手动转换为二进制格式。
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</para>
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<para>
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本函数需要 PostgreSQL 7.2 及其更高版本。在 PostgreSQL 7.2.0 和 7.2.1 版中，如果使用了多字节支持，必须强制转换 bytea
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类型。即 <literal>INSERT INTO test_table (image) VALUES ('$image_escaped'::bytea);</literal>，在 PostgreSQL 7.2.2
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及其更高版本不需要强制转换。异常情况是当客户端和后端字符编码不匹配时，可能会有多字节流错误。然后用户必须强制转换 bytea 以避免此错误。
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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>connection</parameter></term>
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<listitem>
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&pgsql.parameter.connection-with-unspecified-default;
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>data</parameter></term>
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<listitem>
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<para>
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包含要插入到 bytea 列中的文本或二进制数据的 <type>string</type>。
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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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包含转义数据的 <type>string</type>。
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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.connection-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_escape_bytea</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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// 连接到数据库
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$dbconn = pg_connect('dbname=foo');
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// 读入二进制文件
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$data = file_get_contents('image1.jpg');
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// 转义二进制数据
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$escaped = pg_escape_bytea($data);
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// 将其插入数据库
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pg_query("INSERT INTO gallery (name, data) VALUES ('Pine trees', '{$escaped}')");
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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_unescape_bytea</function></member>
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<member><function>pg_escape_string</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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