[] Redis Redis based learning (II) Basic Redis command of the operation, persistence

1. Redis basic commands

1.1 Redis data structure

• redis is stored: data key, value format, wherein the key is a string, value five different data structures
  • value data structure:
    1. String type string
    2. Hash type hash: map format
    3. List type list: linkedlist format. Support repeating elements
    4. Collection types set: do not allow duplicate elements
    5. Type ordered set sortedset: not allow duplicate elements, and sequential elements

String String type 1.2

• Storage: set key value

127.0.0.1:6379> set username zhangsan
OK

• Get: get key

127.0.0.1:6379> get username
"zhangsan"

• Delete: del key

127.0.0.1:6379> del username 
(integer) 1

1.3 Types hash hash

• Storage: hset key field value

127.0.0.1:6379> hset myhash username lisi
(integer) 1
127.0.0.1:6379> hset myhash password 123
(integer) 1

• Obtain:

1. hget key field: obtaining a value corresponding to the specified field

127.0.0.1:6379> hget myhash username
"lisi"

2. hgetall key: Get all the field and value

127.0.0.1:6379> hgetall myhash
1) "username"
2) "lisi"
3) "password"
4) "123"

• Delete: hdel key field

127.0.0.1:6379> hdel myhash username
(integer) 1

1.4 List Type list

You can add an element to the head of the list (on the left) or tails (to the right)

• Add to:
  1. lpush key value: the list of elements into the left table
  2. rpush key value: the elements are added to the right of the list

127.0.0.1:6379> lpush myList a
(integer) 1
127.0.0.1:6379> lpush myList b
(integer) 2
127.0.0.1:6379> rpush myList c
(integer) 3

• Gets: lrange key start end: acquiring range

127.0.0.1:6379> lrange myList 0 -1
1) "b"
2) "a"
3) "c"

• delete:

* lpop key： 删除列表最左边的元素，并将元素返回
* rpop key： 删除列表最右边的元素，并将元素返回

1.5 collection type set

Do not allow duplicate elements

• Storage: sadd key value

127.0.0.1:6379> sadd myset a
(integer) 1
127.0.0.1:6379> sadd myset a
(integer) 0

• Gets: smembers key: get all the elements in the collection set

127.0.0.1:6379> smembers myset
1) "a"

• Delete: srem key value: deleting an element set collection

127.0.0.1:6379> srem myset a
(integer) 1

1.6 indexed collections sortedset

We do not allow duplicate elements and sequential elements. Each element will be associated with a type of score double.
It is to redis from small to large order of collection of member passing score.

• Storage: zadd key score value

127.0.0.1:6379> zadd mysort 60 zhangsan
(integer) 1
127.0.0.1:6379> zadd mysort 50 lisi
(integer) 1
127.0.0.1:6379> zadd mysort 80 wangwu
(integer) 1

• 获取：zrange key start end [withscores]

127.0.0.1:6379> zrange mysort 0 -1
1) "lisi"
2) "zhangsan"
3) "wangwu"

127.0.0.1:6379> zrange mysort 0 -1 withscores
1) "zhangsan"
2) "60"
3) "wangwu"
4) "80"
5) "lisi"
6) "500"

• Delete: zrem key value

127.0.0.1:6379> zrem mysort lisi
(integer) 1

1.7-class instruction

1. keys * : 查询所有的键
2. type key ： 获取键对应的value的类型
3. del key：删除指定的key value

2. endurance of

• redis is an in-memory database, when redis server restart, restart the computer acquisition, data will be lost, we can redis data memory persistence saved to the hard disk file.
• redis persistence mechanism:
  1. RDB
  2. AOF

2.1 RDB

The default mode, no configuration, default on the use of this mechanism

• A certain time interval, the detection of the change key, and persistent data

1. Edit redis.windwos.conf file

#   after 900 sec (15 min) if at least 1 key changed
save 900 1
#   after 300 sec (5 min) if at least 10 keys changed
save 300 10
#   after 60 sec if at least 10000 keys changed
save 60 10000

2. Redis restart the server, and specify the configuration file name

D:\redis-2.8.9>redis-server.exe redis.windows.conf

2.2 AOF

Logging way, the recording operation of each command. After each command can operate, persistent data

1. Edit redis.windwos.conf file

appendonly no（关闭aof） --> appendonly yes （开启aof）

appendfsync always ： 每一次操作都进行持久化
appendfsync everysec ： 每隔一秒进行一次持久化
appendfsync no	 ： 不进行持久化