Redis的使用(客户端)

Posted 2021-03-05 Yan_Hao

Redis

Redis的入门应用

Redis是key-value型数据库

Redis 里的单行命令都是原子的 是为了同时有多个用户对同一个数据修改

string

• set key value

  • 子主题 1

    • SET server:name "fido"

    • GET server:name => "fido"

    • EXISTS server:name => 1

    • EXISTS server:blabla => 0

    • SET connections 10

    • INCR connections => 11

    • INCR connections => 12

    • DEL connections

    • INCR connections => 1

    • It is also possible to increment the number contained inside a key by a specific amount:

    • INCRBY connections 100 => 101

    • And there are similar commands in order to decrement the value of the key.

    • DECR connections => 100

    • DECRBY connections 10 => 90

• get key
• exists key
• DEL key

• EXPIRE key 100

  • 100秒后删除

  • TTL key

    • 显示还有几秒删除
    • 只要set key 一次 之前的计时失效 TTL key 返回-1
    • 返回-2说明计时过了 这东西被删了

  • PERSIST key

    • 让这个计时结束

      • 永久保存

• INCR key

  • INCRBY key 100

• DECR key

  • DECRBY key 100

• 不能简单的get key ?value=value+1 set key value

list

• 对头尾操作较快 且 有序号的

• lpush friend "yanhao"

  • rpush friend "yanhao"
  • lpush friend 1 2 3 4

  • 执行顺序是

    • lpush friend 1
    • lpush friend 2
    • lpush friend 3
    • lpush friend 4

  • 所以结果是 4 3 2 1

• lrange friend 0 -1

  • 切片

  • example

    • LRANGE friends 0 -1 => 1) "Sam", 2) "Alice", 3) "Bob"
    • LRANGE friends 0 1 => 1) "Sam", 2) "Alice"
    • LRANGE friends 1 2 => 1) "Alice", 2) "Bob"

    • lrange friend 0 10

      • 1) "Sam", 2) "Alice", 3) "Bob"

    • lrange friend -3 -1

      • 1) "Sam", 2) "Alice", 3) "Bob"

• lset friend 0 "yanhao"

  • 把friend这个list里面的第0个元素改成"yanhao"

• lpop friend

  • rpop friend
  • 子主题 2

• llen

set

• sadd setname "yanhao"

  • return 0

    • 没加成功,因为本来就有这个key了

  • return 1

    • 加成功了
• sismember setname "yanhao"
• smembers friend
• sincr
• sdecr

• srem friend "yanhao"

  • return 0
  • return 1

• srandmeber friend 2

  • 随机返回数据成员

• spop

  • 随机删

• sunion set1 set2

sorted set

• 在set的同时加上一个用来排序的东西
• ZADD fruit 1 apple
• ZADD fruit 2 banano

• Zrange fruit 0 1

  • 切片

hashes

• hset user:37 name "yanhao"
• hgetall user:37
  

• hmset user:37 name "yanhao" age 17

  • 同时设置多个
• hget user:37 name

• hincrby user:37 name 2

  • name会加2

• hdel

分支主题 2

分支主题 3

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