Brandon: RAM is cheap, but not always expendable depending on what
you're doing.
Using count() on results from PDOStatement::fetchAll() is fine on small
result sets.
Keep in mind that this will certainly blow up on very large result sets,
especially depending on your memory_limit for php. Avoiding this problem
is the primary reason I use prepared statements for retrieving data.
If you're working with small result sets you could avoid using prepared
statements altogether, which would greatly simplify doing something like
getting a row count.
If you don't absolutely need your code to be portable across multiple
database servers, I would encourage you to experiment with the
rowCount() method and see if it works for your setup. (I ran a quick
test in my mysql environment and it worked fine for a SELECT statement.
Sqlite doesn't seem to support it because the actual sqlite library
doesn't support it. Haven't looked into postgres or others.)
Another thing to be aware of (at least with mysql), and speaking to
Lester's point, is that you can use SQL_CALC_FOUND_ROWS (with mysql,
anyway) to get a total count when you are using LIMITs on your result
set (which would be advisable if you're returning these results in a web
interface).
-Matt
On 09/09/2012 02:40 PM, brandon wrote:
That's how I'd do it. Extend the PDO interface on your abstract class
to include a "num_rows()" method that utilizes that higher level
count($this->result). It might be a little more overhead... but RAM is
cheap... and there's always forking/extending the library in C/C++...
-Brandon
On 2012-09-09 11:49, Michael Stowe wrote:
How are you using the number? Probably the easiest way is to utilize
PDOStatement::FetchAll() and then do a count() on that result set.
- Mike
Sent from my iPhone
On Sep 9, 2012, at 11:42 AM, Stefan Wixfort <stefan.wixfort@xxxxxx>
wrote:
Hi Jim
I've had some success with querying using pdo and prepared
statements as
well. One thing that I'm curious about is
How does one handle the need to get the number of rows returned by a
Select? The documentation is very clear that PDO doesn't return that
value for a Select statement (depending upon driver?) and there were a
couple of solutions that made no sense to me. There was even one that
did a completely separate query just to get the row count which makes
even less sense.
I believe you are referring to "SELECT COUNT(*)..."
Because I couldn't find a different way I use that.
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
