redis学习（一）

设置值hset 获取值hget
127.0.0.1:6379> hset phone name apple
(integer) 1
127.0.0.1:6379> hget phone name
"apple"

同时设置多个字段和值(键相同)hset，同时获取多个字段的值(键相同)hget
127.0.0.1:6379> hmset phone price 12000 from America
OK127.0.0.1:6379> hmget phone name price from
1) "apple"
2) "12000"
3) "America"

查看键中所有字段
127.0.0.1:6379> hkeys phone
1) "name"
2) "price"
3) "from"

查看键中所有值127.0.0.1:6379> hvals phone
1) "apple"
2) "12000"
3) "America"

查看键中所有的字段和值
127.0.0.1:6379> hgetall phone
1) "name"
2) "apple"
3) "price"
4) "12000"
5) "from"
6) "America"

查看键中字段的个数
127.0.0.1:6379> hlen phone
(integer) 3

查看键中是否存在某个字段
127.0.0.1:6379> hexists phone price
(integer) 1

键中某个字段增加一定值，只能是数字类型
127.0.0.1:6379> hincrby phone price 1000
(integer) 13000
127.0.0.1:6379> hget phone price
"13000"
127.0.0.1:6379> hincrby phone name 100
(error) ERR hash value is not an integer

如果字段不存在则赋值，如果存在则不赋值

127.0.0.1:6379> hsetnx phone price 11000
(integer) 0
127.0.0.1:6379> hget phone price
"13000"
127.0.0.1:6379> hsetnx phone generation 12
(integer) 1
127.0.0.1:6379> hget phone generation
"12"

删除键中某个字段
127.0.0.1:6379> hdel phone generation
(integer) 1
127.0.0.1:6379> hkeys phone
1) "name"
2) "price"
3) "from"

删除键
127.0.0.1:6379> del phone
(integer) 1
127.0.0.1:6379> exists phone
(integer) 0

总结：
增/改：hset hmset hsetnx hincrby
删：hdel
查：hget hmget hkeys hvals hgetall hlen hexists