• redis:hash哈希类型的操作


    1. hash哈希类型的操作

    1.1. hset key field value

    语法:hset key field value

    作用:把keyfield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

    例:

    127.0.0.1:6379> hset user1 name lisi

    (integer) 1

    127.0.0.1:6379> hset user1 age 22

    (integer) 1

    1.2. hget key field

    语法:hget key field

    作用:返回keyfield域的值

    127.0.0.1:6379> hset user1 name lisi

    (integer) 1

    127.0.0.1:6379> hset user1 age 22

    (integer) 1

    127.0.0.1:6379> hget user1 name

    "lisi"

    127.0.0.1:6379> hget user1 age

    "22"

    1.3. hmset key field value [field value ...]

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

    作用:设置域(field1 ... fieldn)及其对应的值(value1 ... valuen

    返回值:ok

    例:

    127.0.0.1:6379> hmset user2 name wangwu age 25

    OK

    1.4. hmget key field [field ...]

    语法:hmget key field [field ...]

    作用:返回key中域field1 field2 ... 的值

    返回值:存在返回对应的值;不存在返回nil

    例:

    127.0.0.1:6379> hmset user2 name wangwu age 25

    OK

    127.0.0.1:6379> hmget user2 name age

    1) "wangwu"

    2) "25"

    127.0.0.1:6379> hmget user2 name age sex

    1) "wangwu"

    2) "25"

    3) (nil)

    1.5. hgetall key

    语法:hgetall key

    作用:返回key中所有域与其值

    例:

    127.0.0.1:6379> hset user1 name lisi

    (integer) 1

    127.0.0.1:6379> hset user1 age 22

    (integer) 1

    127.0.0.1:6379> hgetall user1

    1) "name"

    2) "lisi"

    3) "age"

    4) "22"

    127.0.0.1:6379> hmset user2 name wangwu age 25

    OK

    127.0.0.1:6379> hgetall user2

    1) "name"

    2) "wangwu"

    3) "age"

    4) "25"

    1.6. hdel key field [field ...]

    语法:hdel key field [field ...]

    作用:删除keyfield

    返回值:真正删除掉的field(域)的个数

    例:

    127.0.0.1:6379> hgetall user2

    1) "name"

    2) "wangwu"

    3) "age"

    4) "25"

    127.0.0.1:6379> hdel user2 age

    (integer) 1

    127.0.0.1:6379> hgetall user2

    1) "name"

    2) "wangwu"

    127.0.0.1:6379> hdel user2 haha

    (integer) 0

    127.0.0.1:6379> hmset user2 name tom age 23 score 99

    OK

    127.0.0.1:6379> hgetall user2

    1) "name"

    2) "tom"

    3) "age"

    4) "23"

    5) "score"

    6) "99"

    127.0.0.1:6379> hdel user2 name age score

    (integer) 3

    127.0.0.1:6379> hmset user2 name tom age 23 score 99

    OK

    127.0.0.1:6379> hdel user2 name age score haha

    (integer) 3

    1.7. hlen key

    语法:hlen key

    作用:返回key中域(field)的个数

    注:不存在的key返回0

    例:

    127.0.0.1:6379> hmset user2 name tom age 23 score 99

    OK

    127.0.0.1:6379> hlen user2

    (integer) 3

    127.0.0.1:6379> hmset user3 name lisa age 21

    OK

    127.0.0.1:6379> hlen user3

    (integer) 2

    1.8. hexists key field

    语法:hexists key field

    作用:判断key中是否存在field

    返回值:存在返回1;不存在返回0

    例:

    127.0.0.1:6379> hmset user3 name lisa age 21

    OK

    127.0.0.1:6379> hexists user3 name

    (integer) 1

    127.0.0.1:6379> hexists user3 score

    (integer) 0

    1.9. hkeys key

    语法:hkeys key

    作用:返回key的所有域(field

    例:

    127.0.0.1:6379> hgetall user3

    1) "name"

    2) "lisa"

    3) "age"

    4) "21"

    5) "score"

    6) "90"

    127.0.0.1:6379> hkeys user3

    1) "name"

    2) "age"

    3) "score"

    1.10. hvals key

    语法:hvals key

    作用:返回key的所有域(field)的值(value

    例:

    127.0.0.1:6379> hgetall user3

    1) "name"

    2) "lisa"

    3) "age"

    4) "21"

    5) "score"

    6) "90"

    127.0.0.1:6379> hvals user3

    1) "lisa"

    2) "21"

    3) "92.5"

  • 相关阅读:
    Python数据结构之字符串
    Python中的logging模块
    Python资源大全中文版
    test
    Python数据结构之元组
    Python之StringIO和BytesIO
    Python标准库之pathlib
    Ubuntu下安装pyenv管理多版本python
    生成器 Generator
    CIDR网段格式
  • 原文地址:https://www.cnblogs.com/reyinever/p/10041231.html
Copyright © 2020-2023  润新知