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38 lines
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HTML
38 lines
2.1 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>从大型对象中读入数据</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-lo-read" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_lo_read</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_lo_read</span> — <span class="dc-title">从大型对象中读入数据</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-seealsr" id="refsect1-function.pg-lo-read-unknown-unknown-unknown-seealsr">
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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_lo_read</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$large_object</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$len</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_lo_read()</strong></span> 从大型对象中读入最多 <code class="parameter">len</code> 字节的数据并以字符串返回。<code class="parameter">large_object</code> 指定了有效的大型对象的资源号，<code class="parameter">len</code> 则指定了大型对象的段所允许的最大长度。如果出错则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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要使用大型对象（lo）接口，需要将其放置在事务块中。
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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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本函数以前的名字为 <em>pg_loread()</em>。
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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_lo_read_all.html" class="function">pg_lo_read_all()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |