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MySQL PHP API  /  ...  /  mysql_db_query

5.5.8 mysql_db_query

Copyright 1997-2014 the PHP Documentation Group.

  • mysql_db_query

    Selects 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:

mysqli_select_db then the query


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 was 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.


5.3.0This function now throws an E_DEPRECATED notice.


Example 5.12 mysql_db_query alternative example


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

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

$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();

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





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


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