<!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>Selects a database and executes a query on it</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.mysql-db-name.html">mysql_db_name</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.mysql-drop-db.html">mysql_drop_db</a></div>
<div class="up"><a href="ref.mysql.html">MySQL Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.mysql-db-query" class="refentry">
<div class="refnamediv">
<h1 class="refname">mysql_db_query</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_db_query</span> — <span class="dc-title">Selects a database and executes a query on it</span></p>
</div>
<div id="function.mysql-db-query-refsynopsisdiv">
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">This extension is deprecated as of PHP 5.5.0, and will be removed in the future.
Instead, the <a href="book.mysqli.html" class="link">MySQLi</a> or <a href="ref.pdo-mysql.html" class="link">PDO_MySQL</a> extension should be used.
See also <a href="mysqlinfo.api.choosing.html" class="link">MySQL: choosing an API</a> guide and
<a href="faq.databases.html#faq.databases.mysql.deprecated" class="link">related FAQ</a> for more information.
Alternatives to this function include:</p>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="mysqli.select-db.html" class="function">mysqli_select_db()</a></span> then the query</li>
<li class="member"> <span class="methodname"><a href="pdo.construct.html" class="methodname">PDO::__construct()</a></span></li>
</ul>
</div>
</div>
<div class="refsect1 description" id="refsect1-function.mysql-db-query-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">resource</span> <span class="methodname"><strong>mysql_db_query</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$database</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
[, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</code><span class="initializer"> = NULL</span></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>mysql_db_query()</strong></span> selects a database, and executes a
query on it.
</p>
<div class="warning"><strong class="warning">Warning</strong><p class="simpara">This function has been
<em class="emphasis">DEPRECATED</em> as of PHP 5.3.0. Relying on this feature is
highly discouraged.</p></div>
</div>
<div class="refsect1 parameters" id="refsect1-function.mysql-db-query-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">database</code></em></span>
<dd>
<p class="para">
The name of the database that will be selected.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">query</code></em></span>
<dd>
<p class="para">
The MySQL query.
</p>
<p class="para">
Data inside the query should be <a href="function.mysql-real-escape-string.html" class="link">properly escaped</a>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">
link_identifier</code></em></span><dd>
<p class="para">The MySQL connection. If the
link identifier is not specified, the last link opened by
<span class="function"><a href="function.mysql-connect.html" class="function">mysql_connect()</a></span> is assumed. If no such link is found, it
will try to create one as if <span class="function"><a href="function.mysql-connect.html" class="function">mysql_connect()</a></span> was called
with no arguments. If no connection is found or established, an
<strong><code>E_WARNING</code></strong> level error is generated.</p></dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.mysql-db-query-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns a positive MySQL result resource to the query result,
or <strong><code>FALSE</code></strong> on error. The function also returns <strong><code>TRUE</code></strong>/<strong><code>FALSE</code></strong> for
<em>INSERT</em>/<em>UPDATE</em>/<em>DELETE</em>
queries to indicate success/failure.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.mysql-db-query-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.3.0</td>
<td>
This function now throws an E_DEPRECATED notice.
</td>
</tr>
<tr>
<td>4.0.6</td>
<td>
This function is deprecated, do not use this function. Use
<span class="function"><a href="function.mysql-select-db.html" class="function">mysql_select_db()</a></span> and
<span class="function"><a href="function.mysql-query.html" class="function">mysql_query()</a></span> instead.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.mysql-db-query-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-1574">
<p><strong>Example #1 <span class="function"><strong>mysql_db_query()</strong></span> alternative example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'mysql_host'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_user'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_password'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Could not connect to mysql'</span><span style="color: #007700">;<br /> exit;<br />}<br /><br />if (!</span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'mysql_dbname'</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Could not select database'</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">'SELECT foo FROM bar WHERE id = 42'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"DB Error, could not query the database\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #DD0000">'MySQL Error: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br /><br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">];<br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.mysql-db-query-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
Be aware that this function does <em class="emphasis">NOT</em>
switch back to the database you were connected before. In other words,
you can't use this function to <em class="emphasis">temporarily</em> run a
sql query on another database, you would have to manually switch back.
Users are strongly encouraged to use the
<em>database.table</em> syntax in their sql queries or
<span class="function"><a href="function.mysql-select-db.html" class="function">mysql_select_db()</a></span> instead of this function.
</p>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.mysql-db-query-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.mysql-query.html" class="function" rel="rdfs-seeAlso">mysql_query()</a> - Send a MySQL query</span></li>
<li class="member"> <span class="function"><a href="function.mysql-select-db.html" class="function" rel="rdfs-seeAlso">mysql_select_db()</a> - Select a MySQL database</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="function.mysql-db-name.html">mysql_db_name</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.mysql-drop-db.html">mysql_drop_db</a></div>
<div class="up"><a href="ref.mysql.html">MySQL Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
