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Asked: 2026-05-10T21:16:30+00:00

I use lazy connection to connect to my DB within my DB object. This

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I use lazy connection to connect to my DB within my DB object. This basically means that it doesn’t call mysql_connect() until the first query is handed to it, and it subsequently skips reconnecting from then on after.

Now I have a method in my DB class called disconnectFromDB() which pretty much calls mysql_close() and sets $_connected = FALSE (so the query() method will know to connect to the DB again). Should this be called after every query (as a private function) or externally via the object… because I was thinking something like (code is an example only)

$students = $db->query('SELECT id FROM students');  $teachers = $db->query('SELECT id FROM teachers');

Now if it was closing after every query, would this slow it down a lot as opposed to me just adding this line to the end

$db->disconnectFromDB();

Or should I just include that line above at the very end of the page?

What advantages/disadvantages do either have? What has worked best in your situation? Is there anything really wrong with forgetting to close the mySQL connection, besides a small loss of performance?

Appreciate taking your time to answer.

Thank you!

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1 Answer

  1. As far as I know, unless you are using persistent connections, your MySQL connection will be closed at the end of the page execution.

    Therefore, you calling disconnect will add nothing and because you do the lazy connection, may cause a second connection to be created if you or another developer makes a mistake and disconnects at the wrong time.

    Given that, I would just allow my connection to close automatically for me. Your pages should be executing quickly, therefore holding the connection for that small amount of time shouldn’t cause any problems.

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