PDO Connection : row count using where clause

Question

I want to count the no of rows in my database..along with where clause and AND clause..

please show me how can we do that in pdo..

these are my queries:

$stmt=$dbh->prepare("SELECT * from questions  where (category_id = ?) AND (complexity_id = ?) ORDER BY RAND()");

$stmt->execute(array($_POST['category'],$_POST['complexity'])); 
    $data = $stmt->fetchAll(PDO::FETCH_OBJ)

count:

$nRows = $dbh->query("SELECT COUNT(*) FROM questions");

i need to write both queries in one query only..

Answer 1

you can use fetchColumn .

 $number_of_rows=$stmt->fetchColumn(); // will give no. of rows
 $data = $stmt->fetchAll(PDO::FETCH_ASSOC)// give the data array

Answer 2

If your queries are different

If your queries are different , like it shown in the question, then keep them as two separate queries. There is no way to get them in one. Just leave it two separate queries, it's all right.

If your queries actually the same

If your queries actually the same, and you want to get your data filtered and also get the number of rows, then you don't need the second query at all. In PHP, there is a function called count(). You can use it to count results returned by your first query.

$nRows = count($data);

as simple as that

Answer 3

Can you just use

$stmt=$dbh->prepare("SELECT COUNT(*) from questions  where (category_id = ?) AND (complexity_id = ?)");

query?