Comments on: PHP MySQLi and Multiple Prepared Statements

By: Using Cursors with PHP MySQLi and Multiple Prepared Statements

Using Cursors with PHP MySQLi and Multiple Prepared Statements — Tue, 30 Mar 2010 11:38:46 +0000

[...] my post on using PHP MySQLi and multiple prepared statements at the same time someone commented that using cursors could do the same thing. With that comment I dug some more and [...]

By: carson

carson — Tue, 16 Feb 2010 03:03:22 +0000

@bill I didn't want to return a ton of duplicated data from the join is all. It feels cleaner to make the second round trip.

By: Bill Karwin

Bill Karwin — Mon, 15 Feb 2010 21:31:37 +0000

Is this a simplified example? Why don't you do this in one query using a join:

select p.id, p.title, c.user_id
from post p left outer join comment c on p.id = c.post_id
where p.id = 1000;

Granted, that will give return n rows with repeating values in the post columns, but you won't have to worry about commands out of sync.

By: Andrey

Andrey — Tue, 09 Feb 2010 13:47:18 +0000

You can also use cursors, with 5.0+ then you don't need to store the result. Cursors fetch data row by row and every fetch means a round-trip to the server. The data is materialized on the server side. Thus, if the results are big cursors are not recommended.