MySQL stored procedure exception handling error code: 1337

 Baidu is saying , To declare variables first , Restart cursor .

 The cursor (cursor) Must be declared before declaring the handler , And variables and conditions must be declared before declaring cursors or handlers .

Error code ： 1337

Variable or condition declaration after cursor or handler declaration

The wrong way to write ：

DROP PROCEDURE IF EXISTS `proc_statistical` ;


DELIMITER ;;


CREATE DEFINER = `root` @`localhost` PROCEDURE `proc_statistical` () 
BEGIN
  #Routine body goes here...
  -- Traversal data end flag
  DECLARE t_error INTEGER DEFAULT 0;
  -- Bind the end flag to the cursor   
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND SET @t_error = 1;

  DECLARE cnt INT ;
  
  START TRANSACTION ;
  Content
  
        IF @t_error = 1 THEN    
            ROLLBACK; 
            // Log failure
        ELSE    
            // Log success
            COMMIT;    
        END IF;  
END ;;


DELIMITER ;


CALL proc_statistical();

Error message reporting error ：

Will prompt in  DECLARE t_error INTEGER DEFAULT 0;  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND S Error on the right .

Error code ： 1337
Variable or condition declaration after cursor or handler declaration

After a careful search of the information, I found that ： If you define the cursor before other variables , There will be errors 1337.

Correct writing ：

DROP PROCEDURE IF EXISTS `proc_statistical` ;


DELIMITER ;;


CREATE DEFINER = `root` @`localhost` PROCEDURE `proc_statistical` () 
BEGIN
  #Routine body goes here...

  DECLARE cnt INT ;
  -- Traversal data end flag
  DECLARE t_error INTEGER DEFAULT 0;
  -- Bind the end flag to the cursor   
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND SET @t_error = 1;

  
  START TRANSACTION ;
  Content
  
        IF @t_error = 1 THEN    
            ROLLBACK; 
            // Log failure
        ELSE    
            // Log success
            COMMIT;    
        END IF;  
END ;;


DELIMITER ;


CALL proc_statistical();