MySQL事务处理和锁定语句

本文只介绍基础、常用的 MySQL 语法语句，更详细的语法语句请移步这里。
另本文所使用的数据库及对应的表请参考MySQL数据定义语句。

1 START TRANSACTION, COMMIT和ROLLBACK 语法

语法

START TRANSACTION | BEGIN [WORK]
COMMIT [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
ROLLBACK [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
SET AUTOCOMMIT = {0 | 1}

1.1 事务例子

BEGIN;
INSERT INTO SC VALUES(201215122, 4, 78);
COMMIT;

查看一下有没有插入数据成功

BEGIN;
INSERT INTO SC VALUES(201215125, 4, 85);
ROLLBACK;

查看一下数据

2 SAVEPOINT和ROLLBACK TO SAVEPOINT 语法

语法

SAVEPOINT identifier
ROLLBACK [WORK] TO SAVEPOINT identifier
RELEASE SAVEPOINT identifier

2.1 示例

BEGIN;
UPDATE SC
SET Grade=82
WHERE Sno = 201215122
AND Cno = 4;
SAVEPOINT point1;
INSERT INTO SC VALUES(201215125, 4, 69);
SAVEPOINT point2;
ROLLBACK TO point1;

3 LOCK TABLES和UNLOCK TABLES 语法

语法

LOCK TABLES
    tbl_name [AS alias] {READ [LOCAL] | [LOW_PRIORITY] WRITE}
    [, tbl_name [AS alias] {READ [LOCAL] | [LOW_PRIORITY] WRITE}] ...
UNLOCK TABLES