PL/SQL学习笔记之事务

一：事务自动提交的开启与关闭

1）开启事务自动提交：则每一个INSERT，UPDATE或DELETE命令执行时，都提交一次事务。

SET AUTOCOMMIT ON;

2）关闭事务自动提交：则执行到COMMIT语句时，才将事务提交。

SET AUTOCOMMIT OFF;

二：保存点：在需要创建保存点的地方，创建一个 SAVEPOINT 变量。

INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (7, 'Rajnish', 27, 'HP', 9500.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (8, 'Riddhi', 21, 'WB', 4500.00 );
SAVEPOINT sav1; //创建保存点

三：提交：COMMIT语句提交事务。

INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (1, 'Ramesh', 32, 'Ahmedabad', 2000.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (2, 'Khilan', 25, 'Delhi', 1500.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (3, 'kaushik', 23, 'Kota', 2000.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (4, 'Chaitali', 25, 'Mumbai', 6500.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (5, 'Hardik', 27, 'Bhopal', 8500.00 );
INSERT INTO CUSTOMERS (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (6, 'Komal', 22, 'MP', 4500.00 );
COMMIT; //提交

四：回滚

1）回滚所有

ROLLBACK;

2）回滚至某个保存点

ROLLBACK TO SAVEPOINT savepointi_name;