How can I execute multiple procedures continuously? - php

Question

Here is my code:
$query = "CALL user_top_categories_score(?, 'ALL', 0, 1)";
$sth = $this->dbh->prepare($query);
$sth->execute([$user_id]);
$category = $sth->fetchAll(PDO::FETCH_ASSOC);
$query = "CALL user_top_tags_score(?, 'ALL', 0, 3)";
$sth = $this->dbh->prepare($query);
$sth->execute([$user_id]);
$tags = $sth->fetchAll(PDO::FETCH_ASSOC);
It throws this error:
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in C:\xampp\htdocs\myweb\others\user.php:71 Stack trace: #0 C:\xampp\htdocs\myweb\others\user.php(71): PDO->prepare('CALL user_top_t...') #1 C:\xampp\htdocs\myweb\application\other.php(24): user->index() #2 C:\xampp\htdocs\myweb\index.php(152): require_once('C:\xampp\htdocs...') #3 {main} thrown in C:\xampp\htdocs\myweb\others\user.php on line 71
Also I've used closeCursor() right after fetchAll(), based on this solution. But sadly it throws a new error:
Warning: Packets out of order. Expected 1 received 9. Packet size=7 in C:\xampp\htdocs\myweb\others\user.php on line 72
Warning: PDO::prepare(): MySQL server has gone away in C:\xampp\htdocs\myweb\others\user.php on line 72
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in C:\xampp\htdocs\myweb\others\user.php:72 Stack trace: #0 C:\xampp\htdocs\myweb\others\user.php(72): PDO->prepare('CALL user_top_t...') #1 C:\xampp\htdocs\myweb\application\other.php(24): user->index() #2 C:\xampp\htdocs\myweb\index.php(152): require_once('C:\xampp\htdocs...') #3 {main} thrown in C:\xampp\htdocs\myweb\others\user.php on line 72
Any idea how can I fix the problem?
Noted1: Each of queries above work separately. I mean, when I call a single procedure, it works as well.
Noted2: Each procedure returns a result set. I mean there is a SELECT statement in those procedures.

Answer 1

You may have just one SELECT in your procedure, but the API doesn't know that. It has to assume you might have multiple result sets returned from your procedure, therefore fetchAll() alone doesn't close the cursor.
You have to keep calling nextRowset() until it has returned a false result, indicating that all results have been returned from this statement.
See also my answer to How can I use a stored procedure in a MySql database with Zend Framework? (I answered this in 2009!).

Answer 2

Well, in the case of Stored Procedure, the $result object is more complex. In the case of applying MVC, multiple source can load multiple call statements, and the cursor from the first $result can be in the next to the last element of the array (In thise case, the Result has no more elements, in other way, is set to false). For me, worked clear all stored result.
Code:
function clearStoredResults($mysqli_link){ #------------------------------------
while($mysqli_link->next_result()){ if($l_result = $mysqli_link->store_result()){ $l_result->free(); } } }
And finally:
function execQuery($sql){
global $conexion;
try {
$result=$conexion->query($sql);
while($row = $result->fetch_assoc()){
$new_array[] = $row; // Inside while loop
}
return $new_array;
} catch (Exception $e) {
echo $e->getMessage();
}
finally {
clearStoredResults($conexion);
}
}
I recomend to explore with care. You can use administrative tools form mysql or mariabd and php, to explore the effects.