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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>Escape a string for insertion into a bytea field</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="function.pg-end-copy.html">pg_end_copy</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-escape-string.html">pg_escape_string</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pg-escape-bytea" class="refentry"> <div class="refnamediv"> <h1 class="refname">pg_escape_bytea</h1> <p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_escape_bytea</span> — <span class="dc-title"> Escape a string for insertion into a bytea field </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>pg_escape_bytea</b></b></span> ([ <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$connection</tt></span> ], <span class="methodparam"><span class="type">string</span> <tt class="parameter">$data</tt></span> )</div> <p class="para rdfs-comment"> <b>pg_escape_bytea()</b> escapes string for bytea datatype. It returns escaped string. </p> <blockquote><p><b class="note">Note</b>: When you <i>SELECT</i> a bytea type, PostgreSQL returns octal byte values prefixed with '\' (e.g. \032). Users are supposed to convert back to binary format manually. <br /> This function requires PostgreSQL 7.2 or later. With PostgreSQL 7.2.0 and 7.2.1, bytea values must be cast when you enable multi-byte support. i.e. <i>INSERT INTO test_table (image) VALUES ('$image_escaped'::bytea);</i> PostgreSQL 7.2.2 or later does not need a cast. The exception is when the client and backend character encoding does not match, and there may be multi-byte stream error. User must then cast to bytea to avoid this error. <br /> </p></blockquote> </div><div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">connection</tt></i></span> <dd> <p class="para"> PostgreSQL database connection resource. When <i><tt class="parameter">connection</tt></i> is not present, the default connection is used. The default connection is the last connection made by <a href="function.pg-connect.html" class="function">pg_connect()</a> or <a href="function.pg-pconnect.html" class="function">pg_pconnect()</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">data</tt></i></span> <dd> <p class="para"> A <a href="language.types.string.html" class="type string">string</a> containing text or binary data to be inserted into a bytea column. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A <a href="language.types.string.html" class="type string">string</a> containing the escaped data. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.2.0</td> <td colspan="1" rowspan="1" align="left"><i><tt class="parameter">connection</tt></i> added</td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>pg_escape_bytea()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php <br /> </span><span style="color: #FF8000">// Connect to the database<br /> </span><span style="color: #0000BB">$dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'dbname=foo'</span><span style="color: #007700">);<br /> <br /> </span><span style="color: #FF8000">// Read in a binary file<br /> </span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #0000BB">file_get_contents</span><span style="color: #007700">(</span><span style="color: #DD0000">'image1.jpg'</span><span style="color: #007700">);<br /> <br /> </span><span style="color: #FF8000">// Escape the binary data<br /> </span><span style="color: #0000BB">$escaped </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_escape_bytea</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);<br /> <br /> </span><span style="color: #FF8000">// Insert it into the database<br /> </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"INSERT INTO gallery (name, data) VALUES ('Pine trees', '{$escaped}')"</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.pg-unescape-bytea.html" class="function" rel="rdfs-seeAlso">pg_unescape_bytea()</a></li> <li class="member"><a href="function.pg-escape-string.html" class="function" rel="rdfs-seeAlso">pg_escape_string()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-end-copy.html">pg_end_copy</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-escape-string.html">pg_escape_string</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</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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