<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Returns result set metadata from a prepared statement</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="mysqli-stmt.reset.html">mysqli_stmt::reset</a></div> <div class="next" style="text-align: right; float: right;"><a href="mysqli-stmt.send-long-data.html">mysqli_stmt::send_long_data</a></div> <div class="up"><a href="class.mysqli-stmt.html">mysqli_stmt</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="mysqli-stmt.result-metadata" class="refentry"> <div class="refnamediv"> <h1 class="refname">mysqli_stmt::result_metadata</h1> <h1 class="refname">mysqli_stmt_result_metadata</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">mysqli_stmt::result_metadata</span> -- <span class="refname">mysqli_stmt_result_metadata</span> — <span class="dc-title">Returns result set metadata from a prepared statement</span></p> </div> <div class="refsect1 description" id="refsect1-mysqli-stmt.result-metadata-description"> <h3 class="title">Description</h3> <p class="para">Object oriented style</p> <div class="methodsynopsis dc-description"> <span class="type"><a href="class.mysqli-result.html" class="type mysqli_result">mysqli_result</a></span> <span class="methodname"><strong>mysqli_stmt::result_metadata</strong></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment">Procedural style</p> <div class="methodsynopsis dc-description"> <span class="type"><a href="class.mysqli-result.html" class="type mysqli_result">mysqli_result</a></span> <span class="methodname"><strong>mysqli_stmt_result_metadata</strong></span> ( <span class="methodparam"><span class="type"><a href="class.mysqli-stmt.html" class="type mysqli_stmt">mysqli_stmt</a></span> <code class="parameter">$stmt</code></span> )</div> <p class="para rdfs-comment"> If a statement passed to <span class="function"><a href="mysqli.prepare.html" class="function">mysqli_prepare()</a></span> is one that produces a result set, <span class="function"><strong>mysqli_stmt_result_metadata()</strong></span> returns the result object that can be used to process the meta information such as total number of fields and individual field information. </p> <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as: <ul class="itemizedlist"> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.field-count.html" class="function">mysqli_num_fields()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.fetch-field.html" class="function">mysqli_fetch_field()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.fetch-field-direct.html" class="function">mysqli_fetch_field_direct()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.fetch-fields.html" class="function">mysqli_fetch_fields()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli.field-count.html" class="function">mysqli_field_count()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.field-seek.html" class="function">mysqli_field_seek()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.current-field.html" class="function">mysqli_field_tell()</a></span></p></li> <li class="listitem"><p class="para"> <span class="function"><a href="mysqli-result.free.html" class="function">mysqli_free_result()</a></span></p></li> </ul> </p> </p></blockquote> <p class="para"> The result set structure should be freed when you are done with it, which you can do by passing it to <span class="function"><a href="mysqli-result.free.html" class="function">mysqli_free_result()</a></span> </p> <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para"> The result set returned by <span class="function"><strong>mysqli_stmt_result_metadata()</strong></span> contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with <span class="function"><a href="mysqli-stmt.fetch.html" class="function">mysqli_stmt_fetch()</a></span>. </p> </p></blockquote> </div> <div class="refsect1 parameters" id="refsect1-mysqli-stmt.result-metadata-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter"> stmt</code></em></span><dd> <p class="para">Procedural style only: A statement identifier returned by <span class="function"><a href="mysqli.stmt-init.html" class="function">mysqli_stmt_init()</a></span>.</p></dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-mysqli-stmt.result-metadata-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a result object or <strong><code>FALSE</code></strong> if an error occurred. </p> </div> <div class="refsect1 examples" id="refsect1-mysqli-stmt.result-metadata-examples"> <h3 class="title">Examples</h3> <div class="example" id="example-1716"> <p><strong>Example #1 Object oriented style</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$mysqli </span><span style="color: #007700">= new </span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">, </span><span style="color: #DD0000">"test"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DROP TABLE IF EXISTS friends"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"CREATE TABLE friends (id int, name varchar(20))"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">prepare</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM friends"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">execute</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* get resultset for metadata */<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">result_metadata</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* retrieve field information from metadata result set */<br /></span><span style="color: #0000BB">$field </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch_field</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Fieldname: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$field</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close resultset */<br /></span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> <div class="example" id="example-1717"> <p><strong>Example #2 Procedural style</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">, </span><span style="color: #DD0000">"test"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"DROP TABLE IF EXISTS friends"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"CREATE TABLE friends (id int, name varchar(20))"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT id, name FROM friends"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysqli_stmt_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* get resultset for metadata */<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_stmt_result_metadata</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* retrieve field information from metadata result set */<br /></span><span style="color: #0000BB">$field </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_fetch_field</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Fieldname: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$field</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close resultset */<br /></span><span style="color: #0000BB">mysqli_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">mysqli_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </div> <div class="refsect1 seealso" id="refsect1-mysqli-stmt.result-metadata-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="mysqli.prepare.html" class="function" rel="rdfs-seeAlso">mysqli_prepare()</a> - Prepare an SQL statement for execution</span></li> <li class="member"> <span class="function"><a href="mysqli-result.free.html" class="function" rel="rdfs-seeAlso">mysqli_free_result()</a> - Frees the memory associated with a result</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="mysqli-stmt.reset.html">mysqli_stmt::reset</a></div> <div class="next" style="text-align: right; float: right;"><a href="mysqli-stmt.send-long-data.html">mysqli_stmt::send_long_data</a></div> <div class="up"><a href="class.mysqli-stmt.html">mysqli_stmt</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>