Bug #16495 Updated: Can mysql_select_db return the previously selected db?

ID: 16495 Updated by: pgl@instinct.org Reported By: pgl@instinct.org Status: Open Bug Type: Feature/Change Request Operating System: FreeBSD PHP Version: 4.1.2 New Comment: How about a function that would give you access to the information output from the "\s" command? mysql_get_server_info, _client_info(), and _host_info() don't display this. And if this function could be implemented, might it be possible for PHP to call it before selecting to a new db (but only if RETURN_OLD_DBNAME was specified when calling mysql_select_db())? Previous Comments: ------------------------------------------------------------------------ [2002-04-26 09:31:29] mfischer@php.net I think you can't accurately implement the tracking of which database you're currently using. As long as you are using mysql_select_db() it's possible to track it with the current mysql resource context. But if you issue a mysql_query() like "use another_db" you're getting out of sync. ------------------------------------------------------------------------ [2002-04-26 09:27:54] pgl@instinct.org Would it be possible to add a flag to the end of the function call to specify that you want it to return the name of the previously selected db? eg: $old_db_name = mysql_select_db('somedb', RETURN_OLD_DBNAME); ? ------------------------------------------------------------------------ [2002-04-08 11:55:20] pgl@instinct.org True, but given that currently the only possible values the function can return are TRUE or FALSE, it seems unlikely that anyone would actually do that. Is there any other way to get the name of the current db inside a function without using global? ------------------------------------------------------------------------ [2002-04-08 11:45:32] mfischer@php.net Well, I can see. If someone wrote if (true === mysql_select_db( ... it's broken (and the API has been long this way). ------------------------------------------------------------------------ [2002-04-08 11:37:30] pgl@instinct.org Would it be possible for mysql_select_db() to return the previously selected db on success, and false (as it does already) on failure? That would make it more useful for times when you want to use another db temporarily, eg: function auth() { // choose the auth db $old_db_name = mysql_select_db('authdb'); // ... code to authenticate a user here ... // change back to whatever was being used before mysql_select_db($old_db_name); } I can't see how adding this would break any existing scripts, either, as the returned value would still have to be true (you can't create databases called '' in mysql, can you?). regards, Peter Lowe. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=16495&edit=1