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+```sql
+## 要操作的表结构与数据
+create table bank(
+ id int primary key auto_increment ,
+ username varchar(10),
+ money int
+);
+
+INSERT INTO `bank` VALUES (1, '张三', 100);
+INSERT INTO `bank` VALUES (2, '李四', 200);
+
+
+
+## 练习题：
+1, 手动关闭系统全局的全动提交。查询表内容，新增一个自己的帐号，和金额，最后回滚。再查询表内容；
+
+set @@autocommit =0;
+SELECT * FROM bank;
+INSERT into bank VALUES(3,'关松涛',1);
+SELECT * FROM bank;
+ROLLBACK;
+SELECT * FROM bank;
+
+2，用 START TRANSACTION 开启事务，查询表内容，把李四的金额改成5000，回滚事务，再查询表内容；
+
+START TRANSACTION;
+SELECT * FROM bank;
+UPDATE bank set money =5000 WHERE id =2;
+SELECT * FROM bank;
+ROLLBACK;
+SELECT * FROM bank;
+
+3，用 START TRANSACTION 开启事务，查询表内容，把李四的金额改成5000，提交事务，再查询表内容；
+
+
+START TRANSACTION;
+SELECT * FROM bank;
+UPDATE bank set money =5000 WHERE id =2;
+COMMIT;
+SELECT * FROM bank;
+
+4，用 START TRANSACTION 开启事务，查询表内容，把张三的金额改成666，设置保存点s1，用自己姓名添加个新账户，金额888888，设置保存s2，回滚到s1保存点，再查询表内容；
+
+START TRANSACTION;
+SELECT * FROM bank;
+UPDATE bank set money =666 WHERE id =1;
+SAVEPOINT s1;
+INSERT into bank VALUES(3,'关松涛',888888);
+SAVEPOINT s2;
+SELECT * FROM bank;
+ROLLBACK to s1;
+SELECT * FROM bank;
+
+5，[作业]创建一个实现银行转账业务的存储函数transfer(),传入合适的参数如转出账户编号，转入账户编号，转账金额，返回是否转账成功。
+ 提醒.要考虑转出金额不足的情况
+ 
+ DROP PROCEDURE if exists transfer;
+CREATE PROCEDURE transfer(IN rollout_id INT ,IN rollin_id INT,IN roll_money int)
+  BEGIN 
+  DECLARE pd VARCHAR(20) DEFAULT '转账失败,余额不足';
+  DECLARE ye int;
+  SELECT money into ye FROM bank WHERE id=rollout_id;
+  START TRANSACTION;
+  IF ye>roll_money THEN
+	 UPDATE bank SET money =money-roll_money WHERE id=rollout_id;
+   UPDATE bank SET money =money+roll_money WHERE id=rollin_id;
+  COMMIT;
+  SET pd ='转账成功';
+ELSE
+	ROLLBACK;
+END IF;
+SELECT pd as '状态';
+  END;
+  
+  call transfer(2,1,9999);
+```
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