【Redis学习笔记】06 Redis 哈希类型基本操作

1. MySQL 数据格式缓存到 Redis

MySQL 的 user 表:
id  name  job  age
1   boss  it   18
2   wei   it   24
3   cokz  it   30

Redis 的 hash 类型：key名规则：对应数据库的表名:ID
key    field1 value field2 value field3 value
user:1 name   boss  job    it    age    18
user:2 name   wei   job    it    age    24
user:3 name   cokz  job    it    age    30

2. 哈希类型常用命令

命令	含义	语法
HMSET	设置一个hash key	HMSET key 字段1 value1 字段2 value2
HMGET	查看 hash key	HMGETkey 字段1 value1 字段2 value2
HMGETALL	查看key中的所有值	HMGETALL key

3. 创建哈希key

语法：HMSET key field value [field value ...]

127.0.0.1:6379> HMSET user:1 name   boss  job    it    age    18
OK
127.0.0.1:6379> HMSET user:2 name   wei   job    it    age    24
OK
127.0.0.1:6379> HMSET user:3 name   cokz  job    it    age    30
OK

4. 查看Hash里的指定字段的值

# MySQL：select name from user where id = 1;
127.0.0.1:6379> HMGET user:1 name
1) "boss"
127.0.0.1:6379> HMGET user:1 name age job age
1) "boss"
2) "18"
3) "it"
4) "18"

5. 查看Hash里的所有字段的值

# MySQL：select * from user where id = 1;
HGETALL user:1

127.0.0.1:6379> HGETALL user:1
1) "name"
2) "boss"
3) "job"
4) "it"
5) "age"
6) "18"

6. 向已有的key中增加字段

127.0.0.1:6379> HMSET user:1 job IT
OK
127.0.0.1:6379> HGETALL user:1
1) "name"
2) "boss"
3) "job"
4) "IT"
5) "age"
6) "18"