php-doc-en/reference/mysql/functions/mysql-db-query.xml

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<refentry xml:id="function.mysql-db-query" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysql_db_query</refname>
  <refpurpose>Send a MySQL query</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>mysql_db_query</methodname>
   <methodparam><type>string</type><parameter>database</parameter></methodparam>
   <methodparam><type>string</type><parameter>query</parameter></methodparam>
   <methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>mysql_db_query</function> selects a database, and executes a 
   query on it.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>database</parameter></term>
     <listitem>
      <para>
       The name of the database that will be selected.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>query</parameter></term>
     <listitem>
      <para>
       The MySQL query.
      </para>
     </listitem>
    </varlistentry>
    &mysql.linkid.description;
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a positive MySQL result resource to the query result,
   or &false; on error. The function also returns &true;/&false; for
   <literal>INSERT</literal>/<literal>UPDATE</literal>/<literal>DELETE</literal>
   queries to indicate success/failure.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.3.0</entry>
       <entry>
        This function now throws an E_DEPRECATED notice.
       </entry>
      </row>
      <row>
       <entry>4.0.6</entry>
       <entry>
        This function is deprecated, do not use this function. Use 
        <function>mysql_select_db</function> and 
        <function>mysql_query</function> instead.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mysql_db_query</function> alternative example</title>
    <programlisting role="php">
<![CDATA[
<?php

if (!$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')) {
    echo 'Could not connect to mysql';
    exit;
}

if (!mysql_select_db('mysql_dbname', $link)) {
    echo 'Could not select database';
    exit;
}

$sql    = 'SELECT foo FROM bar WHERE id = 42';
$result = mysql_query($sql, $link);

if (!$result) {
    echo "DB Error, could not query the database\n";
    echo 'MySQL Error: ' . mysql_error();
    exit;
}

while ($row = mysql_fetch_assoc($result)) {
    echo $row['foo'];
}

mysql_free_result($result);

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Be aware that this function does <emphasis role="strong">NOT</emphasis>
    switch back to the database you were connected before. In other words,
    you can't use this function to <emphasis>temporarily</emphasis> run a
    sql query on another database, you would have to manually switch back.
    Users are strongly encouraged to use the
    <literal>database.table</literal> syntax in their sql queries or
    <function>mysql_select_db</function> instead of this function.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysql_query</function></member>
    <member><function>mysql_select_db</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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