Mysql InnoDB行锁实现方式

只有通过索引条件检索数据，InnoDB才使用行级锁，否则，InnoDB将使用表锁！

新建表并插入数据

create table test(id int,name varchar(10)) engine=innodb;
insert into test values(1,'1'),(2,'2'),(3,'3'),(4,'4');

session_1	session_2
mysql> set autocommit=0; Query OK, 0 rows affected (0.00 sec) mysql> select * from test where id = 1 ; +------+------+ | id   | name | +------+------+ | 1    | 1    | +------+------+ 1 row in set (0.00 sec)	mysql> set autocommit=0; Query OK, 0 rows affected (0.00 sec) mysql> select * from test where id = 2 ; +------+------+ | id   | name | +------+------+ | 2    | 2    | +------+------+ 1 row in set (0.00 sec)
mysql> select * from tab_no_index where id = 1 for update; +------+------+ | id   | name | +------+------+ | 1    | 1    | +------+------+ 1 row in set (0.00 sec)
	mysql> select * from tab_no_index where id = 2 for update; 等待

创建一个id索引即可实现行及锁