redis basic api

Global command (five basic structures string hsah list set zset)
    keys * List all keys, * can replace
    dbsize with a specific match (recommended) The size of the library, that is, the total key
    exists key Whether there is a key
    del key Delete key
    expire key seconds seconds after key expires
    ttl key remaining expiration time
    type key key type
    object encoding key internal encoding of key
string
    set key value Set the value of the
    key setnx key value Set the value of the key, the key cannot exist
    setxx key value Set the value of the key, the key must exist
    get key Get the value of the key
    mset key1 value1 key2 value2 ...... Batch set the value of the key
    mget key1 key2 key3 ...... Get the value of the key in batches
    incr key key value increments automatically, if there is no corresponding key, the default value is set to 0
    append key value append key value
    strlen key value length
    getset key value set mental return to old value
    setrange key offset value set key value offset
    getrange key start end Get the value range of the key
    Internal code
        int 8-byte long integer
        embstr String less than or equal to 39 bytes
        raw String greater than 39 bytes
Hash
    hset key field value Set the value of the hash
    hget kek field Get the hash
    hdel key field delete the field value of the hash hlen
    key get the length of the hash key
    hmset key field1 value1 field2 value2 batch set the hash value
    hmget key field1 field2 batch get the hash value
    Whether there is a corresponding field value in the hexists key field hash
    hkeys * Similar to keys * but this is the hvals key corresponding to the hash
    Get all the values
    ​​of the key hgetall key Get all the filed-value
    hincrby key field The filed in the hash is incremented
    hincrbyfloat key field The filed in the hash is self-incrementing
    hstrlen key field The length of the filed in the hash is
    internally encoded
        ziplist The compressed list
        hashtable
list
    rpush lpush linsert         rpush
        key value1 value2 Left insert data
        lpush key value1 value2 Right insert data
/After inserting data
    lrange lindex llen
        lrange key start end Take out the data in the range
        lindex key index Get the data at the specified position
        llen key Get the length of the list
    lpop rpop lrem ltrim
        lpop key Delete data from the left
        rpop key Delete data from the right
        lrem key count value Find a value equal to value and delete it
        ltrim key start end Only keep the data within the range Data
    lset
        lset key index newValue Modify the value of the specified index subscript
    blpop brpop
        blpop key1 key2 ...... timeout Block pop-up
        brpop key1 key2 ...... timeout
    Internal code
        ziplist
        linkedlist
set sadd
    key value1 value2 Add value
    srem key value1 value2 Delete value
    scar key Calculate the number of elements
    sismember key value Whether to set
    Yuanshu srandmember key [count] Randomly return the specified number of
    Yuanshu spop key Pop up an element at random
    smembers key Get all elements
    sinter key1 key2 .... .. Intersection
    sunion key1 key2 ...... Union
    sdiff key1 key2 ...... Difference
    sinterstore key key1 key2 ...... Intersection and store
    sunionstore key1 key2 ...... Union union Store
    sdiffstore key1 key2 ...... difference set and store
    internally encoded
        intset
        hashtable
ordered set
    zadd key score1 member1 score2 member2 ...... Add set
    zcard key Delete set
    zscore key member Calculate member score
    zrank key member Calculate member rank
    zrevrank key member Calculate member reverse rank
    zrem key member1 member2 ...... Delete set element
    zincrby key increment member self-increment of the set element
    zrange key start end take out the set element
    zrevrange key start end reverse take out the set element
    zrangebyscore key min max take out the set element according to the score
    zrevrangebyscore key min max take out the set element according to the reversal score
    zcount key min max return the specified The set of scores
    zremrangebyrank key start end deletes the specified set element according to the rank
    zremrangebyscore key min max delete the specified set element according to the score
    internal code
        ziplist
        skiplist
key management
    rename key newkey rename the key value
    randomkey randomly select a key value
    expire key seconds seconds after the key expires
    persist key persistent key
    setex key value seconds set the key value, and set the expiration time
    move key db move the key to another database
    dump key persist the key
    restore key restore the key
    flushdb clear the current database
    flushall clear all databases