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This article mainly introduces "what Redis data types are there". In daily operation, I believe many people have doubts about what Redis data types there are. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the questions of "what Redis data types"! Next, please follow the editor to study!

Preface

Redis is a memory-based database that provides certain persistence functions. Redis is a key-value database that uses key as an index to find the corresponding cache data information and return it to the caller. The current Redis supports six data types, namely, String, List, set, hash, zset, and cardinality.

Using Redis programming, we need to be familiar with these six data types and understand their commonly used commands. These six data types defined by Redis can not only provide simple storage functions, but also perform some calculations on the stored data.

The six data types of Redis specify that the values stored in the data type specify that STRING (string) can be saved strings, integers and floating-point numbers can be manipulated on strings, such as adding characters or finding substrings: if it is an integer or floating-point number, calculations can be implemented, such as self-increment and other LIST (list) it is a linked list Each of its nodes contains a string Redis that supports inserting or popping nodes from both ends of the linked list, or clipping it by offset You can also read one or more nodes, delete or find SET (collection) such as nodes according to conditions, it is a collector, but it is unordered, in which each element is a string, and it is unique, and each element can be added, read, or deleted: detect whether an element is in the collection; calculate its intersection, union and difference with other sets, etc. Randomly read elements from the set ZSET (ordered set) it is an ordered collection, can contain strings, integers, floating-point numbers, scores (score), the sorting of elements is determined according to the size of the score, you can add, delete, delete, modify elements, according to the range of scores or members to obtain the corresponding element HyperLogLog (cardinality), its function is to calculate repeated values To determine the number of storage only provides the cardinality of the operation, does not provide the returned function HASH (hash hash table) it is similar to the Java language Map, is a key-value corresponding to the unordered list can delete, change a single key-value pair, you can also get all the key-value pairs, on the "which Redis data types" study is over, I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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