Preface
() is a method provided by the RedisTemplate class for manipulating Hash types. It can be used to perform various operations on the Hash data structure in Redis, such as setting field values, getting field values, deleting field values, etc.
Here are some commonly used () methods and their usage examples:
put: Set the value of the hash field
().put("myhash", "field1", "value1");putAll: Set the value of multiple hash fields
Map<String, Object> map = new HashMap<>();
("field1", "value1");
("field2", "value2");
().putAll("myhash", map);Set expiration time
().getOperations().expire(keyString,10, );
get: Get the value of the hash field
Object value = ().get("myhash", "field1");multiGet: Get the value of multiple hash fields
List<Object> values = ().multiGet("myhash", ("field1", "field2"));hasKey: determines whether the specified field exists in the hash
Boolean hasKey = ().hasKey("myhash", "field1");keys: Get all fields of the hash
Set<Object> keys = ().keys("myhash");values: Get all values of the hash
List<Object> values = ().values("myhash");entries: Get all fields and corresponding values of the hash
Map<Object, Object> entries = ().entries("myhash");increment: Increase the value of the specified field to a specified step size
Long incrementedValue = ().increment("myhash", "field1", 5);delete: delete the specified field
Long deletedFields = ().delete("myhash", "field1");These examples show some common uses of () methods, and you can choose the appropriate method to operate according to your specific business needs.
Please note that in the example "myhash" is the key name of the hash, "field1", "field2", etc. are the fields to be set or obtained, and "value1", "value2", etc. are the values corresponding to the fields.
Summarize
This is the article about the introduction and examples of the usage of () in this article. For more related usage of () please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!