Redis

Database has no name , The default is 16 individual , adopt 0-15 To mark , Connect redis The first database is selected by default

select 5 choice 5 The database

Key value pair

key ： character string

value ： character string 、 Hash 、 list 、 aggregate 、 Ordered set

string type
    set        name    zhang
    setex    name    3    zhang    # Set expiration time
    mset    name    zhang    name    h...    # Set multiple key values
    append    key        value        # Additional
Key command ：
    keys    *
    exists    key        # Judge key Whether there is
    type    key        # see key type
    del        key1 key2...    # Delete key
    expire    key 3    # Set expiration time
    ttl        key        # View effective time
    
hash type
    For storing objects , The object structure is an attribute , value
    The type of value is string
    
    hset    key    field    value
    hmset    key    field1    value1    field2    value2...   # Set multiple properties
    hkeys    key1                                                          # View the properties of the specified key
    hget    key    field                                                   # Get the value of the property
    hmget     key    field1    field2                                # Get values for multiple properties
    hvals    key                                                             # Get the values of all properties
    del                                                                         # Delete the whole hash Key value
    hdel    key    field    field2                                      # Delete attribute , The value corresponding to the property will also be deleted
    
list type
    The element type of the list is string
    Sort by insertion order
    lpush    key    value1    value2                                       # Insert data on the left
    lrange    key    start    stop                                            # see
    rpush    key    value1    value2                                       # Insert data on the right
    linsert    key    before perhaps after     Existing elements , The new element    # Insert the element before or after the specified element
    lset    key    index    value                                              # Set the element value of the specified index location （ The index can be negative ）
    lrem    key    count    value                                           # Put the list before count The value of the second occurrence is value Element delete
                count>0, Remove from the beginning to the end
                count<0, Remove from the tail to the head
                count=0, Remove all
                
                
set type
    unordered set
    Element is string type
    Element is unique , No repetition
    There is no modification operation for the collection
    
    sadd    key        member1 member2...            # Additive elements
    smembers    key                                             # Get elements
    srem    key     Elements                                           # Deletes the specified element
    
zset type
    Ordered set
    Element is string type
    Element is unique , No repetition
    Each element is associated with a doouble Type of score, Said the weight , Sort elements from small to large by weight
    There are no modifications
    
    zadd key score1 member1 score2 member2...        # add to
    zadd a4 5 wangwu 3 zhangsan
    zrange key start stop                                              # Specifies to get the elements in the scope ,start,stop Is the subscript index of the element
    zrangebyscore key min max                                   # obtain score Values in min and max Between the elements
    zscore key member                                                # Get the weight of members in the collection
    zrem key    member1 member2...                          # Deletes the specified element
    zremrangebyscore    key min max                         # Delete the element whose weight is within the specified range