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

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"