mysql创建存储过程实现取款业务，需要向 transInfo 表添加一条记录，并修改 cardInfo 表中对应账号的余额。

好的，下面是实现这个需求的 MySQL 存储过程：

DELIMITER //

CREATE PROCEDURE `withdraw`(IN `account` VARCHAR(20), IN `amount` DECIMAL(10,2))
BEGIN
    DECLARE `balance` DECIMAL(10,2);
    DECLARE `trans_id` INT;
    
    START TRANSACTION;
    
    SELECT `balance` INTO `balance` FROM `cardInfo` WHERE `cardNo` = `account` FOR UPDATE;
    
    IF `balance` >= `amount` THEN
        UPDATE `cardInfo` SET `balance` = `balance` - `amount` WHERE `cardNo` = `account`;
        
        INSERT INTO `transInfo` (`cardNo`, `transDate`, `transType`, `amount`) VALUES (`account`, NOW(), 'withdraw', `amount`);
        
        SET `trans_id` = LAST_INSERT_ID();
        
        COMMIT;
        
        SELECT CONCAT('Withdrawal of ', `amount`, ' successful. Transaction ID is ', `trans_id`, ', Remaining balance is ', `balance` - `amount`, '.') AS `result`;
    ELSE
        ROLLBACK;
        
        SELECT 'Insufficient balance.' AS `result`;
    END IF;
END //

DELIMITER ;

这个存储过程名为 `withdraw`，接受两个参数：`account` 为账户号码，`amount` 为取款金额。它会检查账户余额是否足够，如果足够，则会向 `transInfo` 表中插入一条记录，并更新 `cardInfo` 表中对应账号的余额；否则会回滚事务。

可以通过以下语句调用这个存储过程：

CALL withdraw('1234567890', 100);

其中，`1234567890` 为账户号码，`100` 为取款金额。存储过程会返回一个值，表示操作的结果。