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48 lines
2.4 KiB
HTML
48 lines
2.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>取消 bytea 类型中的字符串转义</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.pg-unescape-bytea" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_unescape_bytea</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_unescape_bytea</span> — <span class="dc-title">
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取消 bytea 类型中的字符串转义
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</span></p>
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</div>
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<div class="refsect1 unknown-unknown-exampleu" id="refsect1-function.pg-unescape-bytea-unknown-unknown-exampleu">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>pg_unescape_bytea</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_unescape_bytea()</strong></span> 将
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bytea 数据类型中的字符串取消转义。返回未转义的字符串(二进制)。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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当 SELECT bytea 类型,PostgreSQL
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返回用 \ 前导的八进制字节值(例如 \032)。用户需要自行将其转换回二进制格式。
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</p>
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<p class="para">
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本函数需要
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PostgreSQL 7.2 或更新版本。在
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PostgreSQL 7.2.0 和 7.2.1
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中,当激活了多字节支持时必须强制转换为 bytea 类型,例如
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<em>INSERT INTO test_table (image)
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VALUES ('$image_escaped'::bytea);</em>。PostgreSQL 7.2.2
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或更新版本不需要强制转换。例外是当客户端和后端的字符编码不匹配时,有可能出现多字节流错误。用户必须强制转换为 bytea 来避免此错误。
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</p>
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</p></blockquote>
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<p class="para">
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参见 <span class="function"><a href="pg_escape_bytea.html" class="function">pg_escape_bytea()</a></span> 和
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<span class="function"><a href="pg_escape_string.html" class="function">pg_escape_string()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |