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PHP mysql_db_query

PHP original manual for mysql_db_query [ show | php.net ]


(PHP 4, PHP 5)

mysql_db_querySelects a database and executes a query on it


This function was deprecated in PHP 5.3.0, and it and the entire original MySQL extension was removed in PHP 7.0.0. Instead, use either the actively developed MySQLi or PDO_MySQL extensions. See also the MySQL: choosing an API guide and its related FAQ entry for additional information. Alternatives to this function include:


resource mysql_db_query ( string $database , string $query [, resource $link_identifier = NULL ] )

mysql_db_query() selects a database, and executes a query on it.



The name of the database that will be selected.


The MySQL query.

Data inside the query should be properly escaped.


The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() had been called with no arguments. If no connection is found or established, an E_WARNING level error is generated.

Return Values

Returns a positive MySQL result resource to the query result, or FALSE on error. The function also returns TRUE/FALSE for INSERT/UPDATE/DELETE queries to indicate success/failure.


Version Description
5.3.0 This function now throws an E_DEPRECATED notice.


Example #1 mysql_db_query() alternative example


if (!$link mysql_connect('mysql_host''mysql_user''mysql_password')) {
'Could not connect to mysql';

if (!
mysql_select_db('mysql_dbname'$link)) {
'Could not select database';

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

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

while (
$row mysql_fetch_assoc($result)) {





Be aware that this function does NOT switch back to the database you were connected before. In other words, you can't use this function to temporarily run a sql query on another database, you would have to manually switch back. Users are strongly encouraged to use the database.table syntax in their sql queries or mysql_select_db() instead of this function.

See Also