Redis Notes, Installation and Common Commands

Reprinted in: http://www.itxuexiwang.com/a/shujukujishu/redis/2016/0216/96.html?1455870708 1.

A brief introduction to

redis Redis is a member of the NoSql family, an in-memory database of key-value pairs. But it supports saving data to local. This is better than memcached.

Disadvantages: No local data buffering, no complete data aggregation support yet.

Advantages : Simple configuration, ease of use, high performance, support for different data types (

hashes , lists, sets, sorted sets) the cache

Second, install the

unofficial version of the windows version. But "maintained by the Microsoft team" is the official statement. Download, decompress and run the

official Linux version of the server. The specific installation is also very simple.

Copy code as follows:


$ wget http://download.redis.io/releases/redis-2.8.17.tar.gz
$ tar xzf redis-2.8 .17.tar.gz
$ cd redis-2.8.17
$ make





3. Common commands
  
    set key value insert key
　　get key get value
    keys * query all keys
　　del key delete key
　　　　 flushall
    Commands related to clearing database connection operations

    quit: close the connection (connection)
    auth: simple password authentication


Persistence

    save: synchronously save data to disk
    bgsave: asynchronously save data to disk
    lastsave: return the last successful data saved to disk Unix timestamp
    shundown: save data synchronously to disk, then shut down the service


remote service control

    info: provide server information and statistics
    monitor: dump received requests in real time
    slaveof: change replication policy settings
    config: configure Redis server


at The command of value operation

    exists(key): confirms whether a key exists
    del(key): deletes a key
    type(key): returns the type of the value
    keys(pattern): returns all keys that satisfy the given pattern
    randomkey: randomly returns the key space a
    keyrename(oldname, newname): rename the key
    dbsize: return the number of keys in the current database
    expire: set the active time of a key (s)
    ttl: get the active time of a key
    select(index): query by index
    move(key, dbindex): move the key in the current database to the dbindex database
    flushdb: delete all keys in the currently selected database
    flushall: delete all keys in all databases The command for key


to String operation

    set(key, value): assign a value to the string named key in the database value
    get(key): return the value of the string named key in the database
    getset(key, value): give the name key The string is given to the last value
    mget(key1, key2,..., key N): Returns the value of multiple strings in the library
    setnx(key, value): Adds a string, the name is key, and the value is value
    setex(key, time, value): add a string to the library, set the expiration time time
    mset(key N, value N): set the value of multiple strings in batches
    msetnx(key N, value N): if all strings named key i do not exist
    incr(key): increment the string named key by 1
    incrby(key, integer): increment the string named key by integer
    decr(key): the string named key minus 1 operation
    decrby(key, integer): the string named key is reduced by integer
    append(key, value): the value of the string named key is appended value
    substr(key, start, end ): return the substring


of

    named key rpush(key, value): add an element whose value is value to the end of the list named key lpush(key, value): add an element named key to the end of the list
    named key Add an element whose value is value to the head of the list
    llen(key): returns the length of the list named key
    lrange(key, start, end): returns the element between start and end in the list named key
    ltrim(key, start, end): intercept the list
    named key lindex(key, index): return the element at the index position in the list named key
    lset(key, index, value): assign a value to the element at the index position in the list named key
    lrem(key, count, value): delete the element whose value is value in the list of count keys
    lpop(key): return and delete the first element in the list named key
    rpop(key): return and delete the one named key tail element in list
    blpop(key1, key2,… key N, timeout): The block version of the lpop command.
    brpop(key1, key2,… key N, timeout): The block version of rpop.
    rpoplpush(srckey, dstkey): Returns and deletes the tail element of the list named srckey, and adds the element to the head of the list named dstkey The command


for Set operation sadd

    (key, member): to the list named key Add an element to the set member
    srem(key, member): delete the element in the set named key member
    spop(key): randomly return and delete an element in the set named key
    smove(srckey, dstkey, member): move to Set element
    scar(key): Returns the cardinality of the set named key
    sismember(key, member): Whether member is an element of the set named key
    sinter(key1, key2,…key N): Find the intersection
    sinterstore(dstkey, ( keys)) : finds the intersection and saves the intersection to the set of
    dstkeys sunion(key1, (keys)) : finds the union
    sunionstore(dstkey, (keys)) : finds the union and saves the union to the set of dstkeys
    sdiff(key1, (keys)) : find the difference
    sdiffstore(dstkey, (keys)) : find the difference and save the difference to the set of
    dstkey smembers(key) : return all elements of the set named key
    srandmember(key ) : Randomly returns an element of the set named key Commands


for Hash operations

    hset(key, field, value): Add an element field to the hash named key
    hget(key, field): Return to the hash named key The value corresponding to field
    hmget(key, (fields)): Returns the value corresponding to field i in the hash named key
    hmset(key, (fields)): Add the element field
    hincrby(key, field, integer): increase the value of the field in the hash named key by integer
    hexists(key, field): whether there is a field with the key field in the hash named key
    hdel(key, field): delete the key in the hash named key
    hlen(key): returns the number of elements in the hash named key hkeys (key): returns
    all keys in the hash named key
    hvals(key): returns the value corresponding to all keys in the hash named key
    hgetall(key): Returns all keys (fields) and their corresponding values ​​in the hash named key