Shulou(Shulou.com)06/01 Report--

Summary of common data types in redis

Redis stores data in the form of key-value pairs key-value, and there are five types of data stored in String,List,Set,Map and ordered collections

Most of the commands for these five data types are similar, often confused and summed up in their spare time.

Type 1: String

1append key value

If key exists, append value to the original value

If it does not exist, create a new one with key as the key and value as the value.

2get key

Returns the string associated with key. Return nil if key does not exist

3bitcount key

Returns the number of bits in a given string that are set to 1

4decr key

Minus one of the numeric values stored in key

5decrby key num

The value stored in key minus num

6getbit key offset

Gets the bit on the specified offset for the string value stored by key

7getrange key start end

Returns the string between start and end stored in key

8getset key value

Sets the value of the given key to value and returns the original value of key

9incr adds one of the numeric values stored in key

10incrby key num

Add the value stored in key to num

11mget key1 key2...

Returns the values of all given key

12mset key1 value1 key2 value2...

Set multiple key-value pairs at the same time

13setex key seconds value

Set the key value key-value pair and set the lifetime of key

14strlen key

Returns the length of the value stored by key

Type 2: HASH (hash), also known as hash

1hset key-name key value

Set a bunch of key-value pairs key value in the hash table named key-name

2hsetnx key-name key value

Set a bunch of key-value pairs key value in the hash table named key-name if and only if key does not exist.

3hmset key-name key1 value1 key2 value2...

Set multiple key-value pairs for a hash named key-name.

4hget key-name key

Get the value named key in the key-name hash table

5hmget key-name key1 key2...

Get the key key1 key2 in the hash table named key-name. Value of

6hgetall key-name

Get all the key-value pairs contained in the hash

7hvals key-name

Gets all the values contained in the hash

8hkeys key-name

Gets all the keys contained in the hash

9hlen key-name

Returns the number of key-value pairs contained in the hash

10hdel key-name key1 key2

Delete one or more values in the hash

11hincrby key-name key increment

Add the value stored in the key key to the integer increment in the hash named key-name

Type 3: list (List)

1lpop key-name

Remove and return the header element of the list key (the leftmost element)

2rpop key-name

Remove and return the tail element of the list key (the rightmost element)

3lpush key-name value1 value2

Push one or more values into the header of the list (leftmost)

4rpush key-name value1 value2...

Push one or more values to the end of the list (rightmost)

5lpushx key-name value

Insert the value value into the header of the list key-name if and only if key exists and is a list

6rpushx key-name value

Insert the value value at the end of the list key-name if and only if key exists and is a list

7ltrim key start stop

Prune a list to retain the elements in the specified range, and elements that no longer specify the interval will be deleted.

8lset key-name index value

Set the value of index in the table below the key-name list to value

9lrange key-name start stop

Returns the elements in the specified range in the list key-name.

10llen key-name

Returns the length of the list key-name

Type 4: collection (SET)

1sadd key-name item1 item2...

Add one or more elements to the collection key-name

2srem key-name item1 item2

Remove one or more elements from the collection key-name

3scard key-name

Returns the number of all elements contained in the collection

4sismember key-name item

Determine whether the item element is a member of the collection key-name

5smembers key-name

Returns all members of the key-name

6sdiff key-name1 key-name2..

Returns the element after the difference operation between the first set and the other sets

7sinter key-name1 key-name2

Returns elements that exist in all sets at the same time, intersection operation

8sunion key-name1 key-name2...

Returns elements that exist in at least one set, union operation

9smove key-name1 key-name2 item

Move item elements from the key-name1 collection to the key-name2 collection

10spop key-name

Removes and returns a random element in the key-name collection

Type 5: ordered set

1zadd key-name score1 member1 [score2 member2]

Add one or more member elements and their score score to the key-name collection

2zrem key-name member1 member2...

Remove one or more members of an ordered set and key-name

3zcard key-name

Returns the number of elements in an ordered collection

4zrank key-name member

Returns the ranking of element member in an ordered set

5zcount key-name min max

Returns the number of members whose score is between min max

6zscore key-name member

Returns the score of the member member in the key-name ordered set

7zrange key-name start stop

Returns the elements in the ordered collection that rank between start stop.

8zincrby key-name increment member

Add an incremental increment to the member member in the ordered collection key-name.

If you have different opinions, you are welcome to discuss common progress with each other.

References include josiah L. Carlson redis in action

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.