How to determine which database is selected

Question

Just use mysql_query (or mysqli_query, even better, or use PDO, best of all) with:

SELECT DATABASE() FROM DUAL;

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Addendum:

There is much discussion over whether or not FROM DUAL should be included in this or not. On a technical level, it is a holdover from Oracle and can safely be removed. If you are inclined, you can use the following instead:

SELECT DATABASE();

That said, it is perhaps important to note, that while FROM DUAL does not actually do anything, it is valid MySQL syntax. From a strict perspective, including braces in a single line conditional in JavaScript also does not do anything, but it is still a valid practice.

SELECT DATABASE();

p.s. I didn't want to take the liberty of modifying @cwallenpoole's answer to reflect the fact that this is a MySQL question and not an Oracle question and doesn't need DUAL.

You can always use STATUS command to get to know Current database & Current User

In the comments of http://www.php.net/manual/de/function.mysql-db-name.php I found this one from ericpp % bigfoot.com:

If you just need the current database name, you can use MySQL's SELECT DATABASE() command:

<?php
function mysql_current_db() {
    $r = mysql_query("SELECT DATABASE()") or die(mysql_error());
    return mysql_result($r,0);
}
?>