mysql存储过程repeat循环给多个表名相似的表添加相同字段

-- 给task表及子表添加客户类型字段
DELIMITER // --结束符号定义为//
drop procedure if exists taskAddFieldPro// 
CREATE PROCEDURE taskAddFieldPro()  
BEGIN  
    DECLARE tableName varchar(50) default '';   
    DECLARE done INT DEFAULT 0;  
    DECLARE taskCursor CURSOR FOR select table_name from information_schema.tables where table_schema='uc_ipcc_cloud_ai' and table_name like  'tb_ucpaas_task_run%';  
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;  
    OPEN taskCursor;  
    REPEAT  
      FETCH taskCursor INTO tableName;  
      IF not done THEN  
         set @sql=concat('alter table ',tableName,' add cust_type char(1) DEFAULT NULL COMMENT "A/B/C/D/E/F"');
         PREPARE stmt from @sql; 
         execute stmt;
      END IF;  
    UNTIL done END REPEAT;  
    CLOSE taskCursor;
END 
//
DELIMITER; -- 重新定义为分号
CALL taskAddFieldPro();