Mysql InnoDB行锁实现方式

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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

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