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    <p>Prepared statements DO use query cache, but it does have conditions:</p> <ul> <li><a href="http://bugs.mysql.com/bug.php?id=735" rel="nofollow">http://bugs.mysql.com/bug.php?id=735</a></li> <li><a href="http://dev.mysql.com/doc/refman/5.1/en/query-cache-operation.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.1/en/query-cache-operation.html</a></li> <li><a href="http://dev.mysql.com/doc/refman/5.5/en/query-cache-operation.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.5/en/query-cache-operation.html</a></li> </ul> <p>From the 5.1 Doc:</p> <blockquote> <p>Before MySQL 5.1.17, prepared statements do not use the query cache. Beginning with 5.1.17, prepared statements use the query cache under certain conditions, which differ depending on the preparation method: </p> <ul> <li>Statements that are issued using the binary protocol using mysql_stmt_prepare() and mysql_stmt_execute(). </li> <li>Statements that are issued using the text (nonbinary) protocol using PREPARE and EXECUTE. See Section 12.6, “SQL Syntax for Prepared Statements”.</li> </ul> </blockquote> <p>Which the 5.5 Doc restates as:</p> <blockquote> <p>Prepared statements that are issued using the binary protocol using mysql_stmt_prepare() and mysql_stmt_execute(), are subject to limitations on caching. Comparison with statements in the query cache is based on the text of the statement after expansion of ? parameter markers. The statement is compared only with other cached statements that were executed using the binary protocol. That is, for query cache purposes, prepared statements issued using the binary protocol are distinct from prepared statements issued using the text protocol. </p> </blockquote>
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    1. POPDO in mysql performance
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    1. CO"Before MySQL 5.1.17, prepared statements do not use the query cache. Beginning with 5.1.17, prepared statements use the query cache under certain conditions, which differ depending on the preparation method: ... Statements that are issued using the binary protocol using mysql_stmt_prepare() and mysql_stmt_execute()"
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    2. CO@thomasrutter - Good idea to quote the doc rather than just link to it. I've added the documentation to be more helpful
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    3. COThere are also some qualifications below that text - for example, caching is done after expansion of "?" parameters, and there are a couple of things to note according to whether you use PREPARE and EXECUTE or whether you use the API functions prepare() etc.
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