A good suggestion. Should I add it like a prefix?

private $prefix;

And then have it assigned at the setHandler.
And a function to change, which would automaticly trigger the disconnect, then connect again using the new prefix ?

I'm not exactly sure if all the databases uses same commands cause I've only used Mysql.

Mysqli, do they have it like mysql_connect, but using mysqli instead of mysql: mysqli_connect ?
And how about query, and array, do they all use the same command, just a different prefix?

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