07.哈希数据类操作.md

• 1. hset 设置哈希field域的值
• 2. hmset 设置哈希多个field域的值
• 3. hget 获取field域的值
• 4. hmget 获取多个field域的值
• 5. hgetall 获取所有field域和值
• 6. hlen 获取field的数量
• 7. hdel 删除field域
• 8. hexists 判断field域是否存在
• 9. hincrby 使field域的值加上整数
• 10. hincrbyfloat 使field域的值加上浮点数
• 11. hkeys 获取所有所有field域的名字
• 12. kvals 获取所有所有field域的值

1. hset 设置哈希field域的值

hset key field value
# 把key中 filed域的值设为value
# 注:如果没有field域，直接添加，如果有，则覆盖原field域的值

# 示例
127.0.0.1:6379> hset user name zhangsan
(integer) 1
127.0.0.1:6379> hset user age 25
(integer) 1
127.0.0.1:6379> hset user gender male
(integer) 1

2. hmset 设置哈希多个field域的值

hmset key field1 value1 [field2 value2 field3 value3 ......fieldn valuen]
# 一次设置多个field和对应的value

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
OK

3. hget 获取field域的值

hget key field
# 获取field域的值

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
OK
127.0.0.1:6379> hget user age
"26

4. hmget 获取多个field域的值

hget key field
# 获取多个field域的值

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
OK
127.0.0.1:6379> hmget user name age
1) "lisi"
2) "26"

5. hgetall 获取所有field域和值

hgetall key
# 获取哈希key的所有field域和值

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
127.0.0.1:6379> hgetall user
1) "name"
2) "lisi"
3) "age"
4) "26"
5) "gender"
6) "male"

6. hlen 获取field的数量

hlen key
# 获取field的数量

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
127.0.0.1:6379> hlen user
(integer) 3

7. hdel 删除field域

hdel key field
# 删除key中 field域

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
127.0.0.1:6379> hdel user age
(integer) 1
127.0.0.1:6379> hgetall user
1) "name"
2) "lisi"
3) "gender"
4) "male"

8. hexists 判断field域是否存在

hexists key field
# 判断key中有没有field域

# 示例
127.0.0.1:6379> hmset user name lisi age 26 gender male
OK
127.0.0.1:6379> hexists user age
(integer) 1
127.0.0.1:6379> hexists user height
(integer) 0

9. hincrby 使field域的值加上整数

hincrby key field value
# 使key中的field域的值加上整型值value

# 示例
127.0.0.1:6379> hmset user name zhangsan height 158
OK
127.0.0.1:6379> hincrby user height 2
(integer) 160

10. hincrbyfloat 使field域的值加上浮点数

hincrbyfloat key field value
# 使key中的field域的值加上浮点值value

# 示例
127.0.0.1:6379> hmset user name zhangsan height 158
OK
127.0.0.1:6379> hincrbyfloat user height 5.5
"165.5"

11. hkeys 获取所有所有field域的名字

hkeys key
# 获取key中所有的field

# 示例
127.0.0.1:6379> hmset user name zhangsan age 25 gender male
OK
127.0.0.1:6379> hkeys user
1) "name"
2) "age"
3) "gender"

12. kvals 获取所有所有field域的值

kvals key
# 返回key中所有的value

# 示例
127.0.0.1:6379> hmset user name zhangsan age 25 gender male
OK
127.0.0.1:6379> hvals user
1) "zhangsan"
2) "25"
3) "male"