学校网站建设审批,优秀的手机网站案例,网站建设美橙,网站开发 制作文章目录 Redis之hash类型1. 设置一个字段/获取一个字段2. 获取所有字段值3. 判断字段是否存在4. 设置多个字段/获取多个字段5. 只获取字段名/字段值6. 获取某个key内全部数量7. 增加数字8. 删除key内字段9. 字段不存在时赋值10. 应用场景 Redis之hash类型 redis的hash类型就像Java中的MapString, MapObject,Object
1. 设置一个字段/获取一个字段
设置一个字段HSET key field value 获取一个字段HGET key field
127.0.0.1:6379 hset user id 1
(integer) 1
127.0.0.1:6379 hget user id
12. 获取所有字段值
HGETALL key
127.0.0.1:6379 hgetall user
1) id
2) 13. 判断字段是否存在
HEXISTS key field 存在返回1不存在返回0.
127.0.0.1:6379 hexists user id
(integer) 1
127.0.0.1:6379 hexists user name
(integer) 0
127.0.0.1:6379 hgetall user
1) id
2) 14. 设置多个字段/获取多个字段
设置多个字段HMSET key field value [field value …] 获取多个字段HMGET key field [field …]
127.0.0.1:6379 hgetall user
1) id
2) 1
127.0.0.1:6379 hmset user name zhangsan address xian score 99
OK
127.0.0.1:6379 hmget user id name
1) 1
2) zhangsan
127.0.0.1:6379 hmget user id name address score
1) 1
2) zhangsan
3) xian
4) 99
127.0.0.1:6379 hgetall user
1) id
2) 1
3) name
4) zhangsan
5) address
6) xian
7) score
8) 995. 只获取字段名/字段值
获取字段名HKEYS key 获取字段值HVALS key
127.0.0.1:6379 hgetall user
1) id
2) 1
3) name
4) zhangsan
5) address
6) xian
7) score
8) 99
127.0.0.1:6379 hkeys user
1) id
2) name
3) address
4) score
127.0.0.1:6379 hvals user
1) 1
2) zhangsan
3) xian
4) 99
127.0.0.1:6379 hvals person
(empty list or set)
127.0.0.1:6379 hkeys person
(empty list or set)6. 获取某个key内全部数量
HLEN key
127.0.0.1:6379 hgetall user
1) id
2) 1
3) name
4) zhangsan
5) address
6) xian
7) score
8) 99
127.0.0.1:6379 hlen user
(integer) 47. 增加数字
HINCRBY key field increment
127.0.0.1:6379 hget user id
1
127.0.0.1:6379 hincrby user id 5
(integer) 6
127.0.0.1:6379 hget user id
68. 删除key内字段
HDEL key field
127.0.0.1:6379 hgetall user
1) id
2) 6
3) name
4) zhangsan
5) address
6) xian
7) score
8) 99
127.0.0.1:6379 hkeys user
1) id
2) name
3) address
4) score
127.0.0.1:6379 hdel user address
(integer) 1
127.0.0.1:6379 hgetall user
1) id
2) 6
3) name
4) zhangsan
5) score
6) 99
127.0.0.1:6379 hkeys user
1) id
2) name
3) score9. 字段不存在时赋值
HSETNX key field value
127.0.0.1:6379 hkeys user
1) id
2) name
3) score
127.0.0.1:6379 hsetnx user address xian
(integer) 1
127.0.0.1:6379 hkeys user
1) id
2) name
3) score
4) address
127.0.0.1:6379 hvals user
1) 6
2) zhangsan
3) 99
4) xian
127.0.0.1:6379 hgetall user
1) id
2) 6
3) name
4) zhangsan
5) score
6) 99
7) address
8) xian
127.0.0.1:6379 hsetnx user score 98
(integer) 0
127.0.0.1:6379 hgetall user
1) id
2) 6
3) name
4) zhangsan
5) score
6) 99
7) address
8) xian10. 应用场景
购物车 用户id为100的用户购物车买了商品item1 1件, 商品item2 1件然后增加商品item2 到4件查看用户总共买了多少商品每个商品分别是多少。 127.0.0.1:6379 hset shopcar:uid100 item1 1
(integer) 1
127.0.0.1:6379 hset shopcar:uid100 item2 1
(integer) 1
127.0.0.1:6379 hincrby shopcar:uid100 item2 3
(integer) 4
127.0.0.1:6379 hlen shopcar:uid100
(integer) 2
127.0.0.1:6379 hgetall shopcar:uid100
1) item1
2) 1
3) item2
4) 4
