事务

1.开启事务,提交事务

127.0.0.1:6379> multi
OK
127.0.0.1:6379> set k1 v1
QUEUED
127.0.0.1:6379> set k2 v2
QUEUED
127.0.0.1:6379> exec
1) OK
2) OK
127.0.0.1:6379> keys *
1) "k2"
2) "k1"

2.开启事务,放弃事务

127.0.0.1:6379> multi
OK
127.0.0.1:6379> set k3 v3
QUEUED
127.0.0.1:6379> set k4 v4
QUEUED
127.0.0.1:6379> discard
OK
127.0.0.1:6379> keys *
1) "k2"
2) "k1"

3.开启事务,放到队列报错,执行,全部失效

127.0.0.1:6379> multi
OK
127.0.0.1:6379> set k1 v1
QUEUED
127.0.0.1:6379> set k2
(error) ERR wrong number of arguments for 'set' command
127.0.0.1:6379> exec
(error) EXECABORT Transaction discarded because of previous errors.
127.0.0.1:6379>
127.0.0.1:6379> keys *
(empty list or set)

4.开启事务,放到队列没报错,执行期间报错,执行后,正确的依然生效

127.0.0.1:6379> multi
OK
127.0.0.1:6379> set k1 v1
QUEUED
127.0.0.1:6379> incr k1
QUEUED
127.0.0.1:6379> set k2 v2
QUEUED
127.0.0.1:6379> exec
1) OK
2) (error) ERR value is not an integer or out of range
3) OK
127.0.0.1:6379> keys *
1) "k2"
2) "k1"
127.0.0.1:6379>

真实案例

乐观锁vs悲观锁



watch命令

秒杀案例