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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Deletes the large object</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.pdo-pgsql.html">PostgreSQL (PDO)</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.pdo-sqlite.html">SQLite (PDO)</a></div> <div class="up"><a href="ref.pdo-pgsql.html">PostgreSQL (PDO)</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pdo-pgsqllobunlink" class="refentry"> <div class="refnamediv"> <h1 class="refname">PDO::pgsqlLOBUnlink</h1> <p class="verinfo">(PHP 5 >= 5.1.2, PECL pdo_pgsql:1.0.1-1.0.2)</p><p class="refpurpose"><span class="refname">PDO::pgsqlLOBUnlink</span> — <span class="dc-title">Deletes the large object</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>PDO::pgsqlLOBUnlink</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$oid</tt></span> )</div> <p class="para rdfs-comment"> Deletes a large object from the database identified by OID. </p> <blockquote><p><b class="note">Note</b>: <span class="simpara"> This function must be called within a transaction. </span> </p></blockquote> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">oid</tt></i></span> <dd> <p class="para"> A large object identifier </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>PDO::pgsqlLOBUnlink()</b> example</b></p> <div class="example-contents"><p> This example unlinks a large object from the database prior to deleting the row that references it from the blobs table we've been using in our <a href="function.pdo-pgsqllobcreate.html" class="function">PDO::pgsqlLOBCreate()</a> and <a href="function.pdo-pgsqllobopen.html" class="function">PDO::pgsqlLOBOpen()</a> examples. </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$db </span><span style="color: #007700">= new </span><span style="color: #0000BB">PDO</span><span style="color: #007700">(</span><span style="color: #DD0000">'pgsql:dbname=test host=localhost'</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">, </span><span style="color: #0000BB">$pass</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$db</span><span style="color: #007700">-></span><span style="color: #0000BB">setAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">PDO</span><span style="color: #007700">::</span><span style="color: #0000BB">ATTR_ERRMODE</span><span style="color: #007700">, </span><span style="color: #0000BB">PDO</span><span style="color: #007700">::</span><span style="color: #0000BB">ERRMODE_EXCEPTION</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$db</span><span style="color: #007700">-></span><span style="color: #0000BB">beginTransaction</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$db</span><span style="color: #007700">-></span><span style="color: #0000BB">pgsqlLOBUnlink</span><span style="color: #007700">(</span><span style="color: #0000BB">$oid</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">$db</span><span style="color: #007700">-></span><span style="color: #0000BB">prepare</span><span style="color: #007700">(</span><span style="color: #DD0000">"DELETE FROM BLOBS where ident = ?"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">execute</span><span style="color: #007700">(array(</span><span style="color: #0000BB">$some_id</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">$db</span><span style="color: #007700">-></span><span style="color: #0000BB">commit</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pdo-pgsqllobopen.html" class="function" rel="rdfs-seeAlso">PDO::pgsqlLOBOpen()</a></li> <li class="member"><a href="function.pdo-pgsqllobcreate.html" class="function" rel="rdfs-seeAlso">PDO::pgsqlLOBCreate()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.pdo-pgsql.html">PostgreSQL (PDO)</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.pdo-sqlite.html">SQLite (PDO)</a></div> <div class="up"><a href="ref.pdo-pgsql.html">PostgreSQL (PDO)</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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