| [整理]mysql事务隔离级别，小测试[3] | ||
| 添加日期：2016/7/29 17:35:03 | 快速返回 返回列表 | 阅读1655次 |
+------------------------+ | @@session.tx_isolation | +------------------------+ | REPEATABLE-READ | +------------------------+ 1 row in set mysql> start transaction; Query OK, 0 rows affected mysql> select * from test; +----+------+ | id | name | +----+------+ | 1 | bbb2 | | 2 | aaa2 | +----+------+ 2 rows in set mysql> SELECT @@session.tx_isolation; +------------------------+ | @@session.tx_isolation | +------------------------+ | REPEATABLE-READ | +------------------------+ 1 row in set mysql> start transaction; Query OK, 0 rows affected mysql> select * from test; +----+------+ | id | name | +----+------+ | 1 | bbb2 | | 2 | aaa2 | +----+------+ 2 rows in set mysql> up^date test set name="ccc1" where id=1; Query OK, 1 row affected Rows matched: 1 Changed: 1 Warnings: 0 mysql> up^date test set name="ddd1" where id=2; Query OK, 1 row affected Rows matched: 1 Changed: 1 Warnings: 0 事务A更新，给id为1和2的上锁。 mysql> in^sert into test(name) values("eee"); Query OK, 1 row affected 事务B正常插入 mysql> select * from test; +----+------+ | id | name | +----+------+ | 1 | ccc1 | | 2 | ddd1 | +----+------+ 2 rows in set mysql> commit; Query OK, 0 rows affected mysql> commit; Query OK, 0 rows affected mysql> select * from test; +----+------+ | id | name | +----+------+ | 1 | ccc1 | | 2 | ddd1 | | 3 | eee | +----+------+ 3 rows in set mysql> select * from test; +----+------+ | id | name | +----+------+ | 1 | bbb2 | | 2 | aaa2 | | 3 | eee | +----+------+ 3 rows in set --------------------------------------- 结论： REPEATABLE-READ级别下： 由于id是主键索引，是唯一索引，所以id=1和2的，只给自己上了锁（其他事务插入的id一定不是1和2），其他记录插入无影响。 |
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