MySQL存储过程：无法从PHP代码运行

Question

I have the below stored procedure to check the user name availability

DELIMITER $$;

DROP PROCEDURE IF EXISTS tv_check_email$$

CREATE PROCEDURE tv_check_email (IN username varchar(50))
BEGIN
  select USER_ID from tv_user_master where EMAIL=username;
END$$

DELIMITER ;$$

When I run this from my MySQL front end tool, it is works just fine:

call tv_check_email('shyju@techies.com')

But when trying to execute from the PHP page, I get an error like

"PROCEDURE mydatabase.tv_check_email can't return a result set in the given context"

I am sure that my PHP version is 5.2.6.

Answer 1

You need to bind your result into an OUT parameter.

See the mysql docs on stored procedures

mysql> delimiter //

mysql> CREATE PROCEDURE simpleproc (OUT param1 INT)
    -> BEGIN
    ->   SELECT COUNT(*) INTO param1 FROM t;
    -> END;
    -> //
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> CALL simpleproc(@a);
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT @a;
+------+
| @a   |
+------+
| 3    |

+------+

Answer 2

It looks like if you use the mysqli PHP library you can actually retrieve your result set without having to use an OUT variable and another query to retrieve your value. This article covers the details:

http://amountaintop.com/php-5-and-mysql-5-stored-procedures-error-and-solution-qcodo

Answer 3

Cody is not 100% right. You can bind your resulting return columns and return select data from within a stored procedure.

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$stmt = $mysqli->prepare("call tv_check_email(?)");
$stmt->bind_param('s', "shyju@techies.com");
$stmt->execute();

$stmt->bind_result($userid);

while ($stmt->fetch()) {
  printf("User ID: %d\n", $userid);
}

$stmt->close();
$mysqli->close();