CALL Statement调用存储过程

CALL sp_name([parameter[,...]])
CALL sp_name[()]

CREATE PROCEDURE p (OUT ver_param VARCHAR(25), INOUT incr_param INT)
BEGIN
  # Set value of OUT parameter
  SELECT VERSION() INTO ver_param;
  # Increment value of INOUT parameter
  SET incr_param = incr_param + 1;
END;

mysql> SET @increment = 10;
mysql> CALL p(@version, @increment);
mysql> SELECT @version, @increment;
+------------------+------------+
| @version         | @increment |
+------------------+------------+
| 5.7.20-debug-log |         11 |
+------------------+------------+

mysql> SET @increment = 10;
mysql> PREPARE s FROM 'CALL p(?, ?)';
mysql> EXECUTE s USING @version, @increment;
mysql> SELECT @version, @increment;
+------------------+------------+
| @version         | @increment |
+------------------+------------+
| 5.7.20-debug-log |         11 |
+------------------+------------+