redis hash

I. Concept In Redis, there is also a hash type for the structure of key-value pairs like other languages, and the key value of a redis hash type is itself a key-value pair structure. Such as: Key value User:1 Key value Code 01 Name Shl Use

Redis Hash is a string-type field and value mapping table, and hash is particularly useful for storing objects. Each hash in a Redis can store 2^32-1 key-value pairs (more than 4 billion). Example 127.0.0.1:6379> hmset runoobkey name "

Php methods and code examples for operating hash and zset data in redis. In the previous blog, the main types are string, list, and set. hash and zset type 1 are listed below. hset description: set the field value in the hash table key to value. If the key does not exist, the previous blog mainly belongs to the string,

is returned. 10, hincrby Description: adds an incremental increment to the field value of the hash table key. An increment can also be a negative number, which is equivalent to performing a subtraction operation on a given domain.Parameter: key field incrementReturned value: the field value in the key of the hash table after the HINCRBY command is executed. 11, hkeys Description: return all fields in the

hashing (hash)The Hash type in Redis can be seen as a map container with string key and string value. This type is ideal for storing object information. such as the user's username password and so on. Each Hash can store 4,294,967,295 key-value pairs Storage (Hset) Hset key field Value field does not exist and is stor

Redis Hash is a string-type field and value mapping table. Its addition, delete operations are O (1) (average). Hash is particularly useful for storing objects. there is a single string type compared to each field of an object. Storing an object in a hash type takes up less memory and makes it easier to access the enti

This article mainly introduces php methods and code examples for operating hash and zset data in redis. This article describes 26 groups of functions or methods, for more information, see the previous blog: string, list, and set. The following are hash and zset types. 1, hset Description: sets the field value in the key field of the

The hash table is also one of the data structures supported by Redis, which uses both redis_encoding_ziplist (compressed list) and redis_encoding_ht (data Dictionary) encoding methods.When a hash table uses a compressed list, it uses the following structure to store the data (see ZIPLIST.C):+---------+------+------+------+------+------+------+------+------+------

hdel key field [field ...] Deletes one or more specified domains in the hash table key, and the nonexistent fields are ignored.In versions below Redis2.4, Hdel can delete only a single domain at a time, and if you need to delete multiple domains in an atomic time, include the command in the Multi/exec block.Available versions:2.0.0+Complexity of Time:O (n), n is the number of fields to be deleted.return value:The number of domains successfully remove

Description: Adds increment increment to the value of the field field in the hash table key. An increment can also be a negative number, which is equivalent to subtracting a given field.Parameters: Key field incrementReturn value: The value of the field field in the hash table key after executing the Hincrby command. 11,hkeys Description: Returns all the fields in the

Tags: redis--hashRedis Hash is a string-type field and value mapping table, and hash is particularly useful for storing objects.1, Hset Method:Hset key field valueSet the value of the field (field) fields in the hash table key to value.If the key does not exist, a new hash t

During cluster deployment, for high availability purposes, sessions are often shared and shared into two categories: Session replication and centralized management.Redis can play a more important role in the centralized management of the session.Two main factors restricting the session centralized sharing:1. The session must have an HA mechanism to ensure that the session is not lost in the event of a failure of some servers in the cluster.2. Session life cycle Management.3. The session size is

Redis Hash Key command Implementation (T_hash) 1. Hash command Introduction All Redis hash commands are shown in the following table: Redis hash command in detail Serial N

This article mainly introduces php methods and code examples for operating hash and zset data in redis. This article describes 26 groups of functions or methods. For more information, see This article mainly introduces php methods and code examples for operating hash and zset data in redis. This article describes 26 gr

;>>>>>>>>>>>>>>>>>>"); Mapofh.entries (TID); System.out.println (">>>>>>>>>>>>>>>>>>>>>>>>>>" +entries2.tostring ()); for(Object key:keys) {ofh.increment (Tid,key,111); } Mapofh.entries (TID); System.out.println (">>>>>>>>>>>>>>>>>>>>>>>>>>" +entries3.tostring ()); for(Object key:keys) {ofh.increment (Tid,key,-11); } Mapofh.entries (TID); System.out.println (">>>>>>>>>>>>>>>>>>>>>>>>>>" +entries4.tostring ()); Ofh.delete (Tid,keys.toarray ()); System.out.println ("Delete Success >>>>>>>