PHP PDO - Using MySQL Variables

Question

I\'m trying to run a query in PHP using PDO. The query has some variables at the top to determine a rank, except the when using the SET @var in the $sql, it returns an empty

Answer 1

Found the solution here: https://stackoverflow.com/a/4685040/1266457

Thank you :)

To fix:

// Prepare and execute the variables first
$sql = "
SET @prev_value = NULL;
SET @rank_count = 0;
SET @rank_increasing = 0;
";
$sth = $dbh->prepare($sql);
$sth->execute();

// Run the main query
$sql = "
SELECT a.*
     , @rank_increasing := @rank_increasing + 1 AS row_num
     , CASE
       WHEN @prev_value = score 
          THEN @rank_count
       WHEN @prev_value := score 
          THEN @rank_count := @rank_increasing
       END AS rank
  FROM ( 
       -- INLINE VIEW --
       ) a
"; ...