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123 lines
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HTML
123 lines
6.3 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>将大型对象导出到文件</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-export" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_lo_export</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_export</span> — <span class="dc-title">将大型对象导出到文件</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pg-lo-export-description">
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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_export</strong></span>
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([ <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
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], <span class="methodparam"><span class="type">int</span> <code class="parameter">$oid</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$pathname</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_lo_export()</strong></span> takes a large object in a
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PostgreSQL database and saves its contents to a file on the local
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filesystem.
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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_loexport()</em>。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.pg-lo-export-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">connection</code></dt>
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<dd>
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<p class="para">
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PostgreSQL database connection resource. When
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<code class="parameter">connection</code> is not present, the default connection
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is used. The default connection is the last connection made by
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<span class="function"><a href="pg_connect.html" class="function">pg_connect()</a></span> or <span class="function"><a href="pg_pconnect.html" class="function">pg_pconnect()</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">oid</code></dt>
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<dd>
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<p class="para">
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要导出的数据库里的大型对象的 <var class="varname"><var class="varname">OID</var></var>。
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</p>
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</dd>
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<dt>
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<code class="parameter">pathname</code></dt>
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<dd>
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<p class="para">要导出的数据库里的大型对象的文件在客户端上完整路径和文件名。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.pg-lo-export-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pg-lo-export-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2502">
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<p><strong>Example #1 <span class="function"><strong>pg_lo_export()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /> $database </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=jacarta"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #DD0000">"begin"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$oid </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_lo_create</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_lo_open</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #0000BB">$oid</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_lo_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #DD0000">"large object data"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_lo_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_lo_export</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #0000BB">$oid</span><span style="color: #007700">, </span><span style="color: #DD0000">'/tmp/lob.dat'</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #DD0000">"commit"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.pg-lo-export-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="pg_lo_import.html" class="function" rel="rdfs-seeAlso">pg_lo_import()</a> - 将文件导入为大型对象</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |