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Transitioning to PDO/MySQL.  Need help  with counting rows in table

Posted on 2014-12-23
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Last Modified: 2014-12-23
I need to count rows in one table and compare to number of rows in another to make sure they are equal.

I have something incorrect to get data from the import table.   I am getting the following error:
Fatal error: Call to undefined method PDO::execute()

$query18 = "SELECT COUNT(*) FROM Download";
$conn->prepare($query18);       
$conn->execute();
$number_of_rows = $query18->fetchColumn();
echo $number_of_rows;

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Question by:lawrence_dev
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Expert Comment

by:AngryBinary
ID: 40515066
Typo. Try "conn->exec();"
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AngryBinary earned 500 total points
ID: 40515074
Actually, that's not going to give you the result you want. Try this instead:

$query18 = "SELECT COUNT(*) FROM Download";
$statement = $conn->prepare($query18);      
$statement->execute();
$number_of_rows = $statement->fetchColumn();
echo $number_of_rows;
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Author Closing Comment

by:lawrence_dev
ID: 40515089
Thank You!!!!
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LVL 58

Expert Comment

by:Gary
ID: 40515123
Invariably you are not doing a query just to get the number of rows, but wanting to know how many rows your query returned before working on the data - e.g. for pagination
So this would be the better way to do it.

$query18 = "SELECT * FROM Download";
$conn->query($query18);       

$totalrecords=$conn->query('SELECT FOUND_ROWS()')->fetch(PDO::FETCH_COLUMN); // Get result count

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Author Comment

by:lawrence_dev
ID: 40515129
Gary, I will ask another related question.   Coming shortly.
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