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Redis determines whether the value exists

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2019-06-04 16:55:2514095browse

Redis supports five data types:

string (string)

hash (hash)

list (list)

set ( Set)

zset(sorted set: ordered set)

Redis determines whether the value exists

redis determines whether the value exists

In SISMEMBER in the set and ZRANK, ZREVRANK, and ZSCORE in the ordered set can all determine whether a member is in the set!

Example:

The set command in redis to determine whether a certain value exists in the value of a certain key: sismember, if it exists, it returns 1, if it does not exist, it returns 1 Return 0

127.0.0.1:6379>sismember mySet 3  ---返回值为0,因为myset的set成员中只有1,2没有3
127.0.0.1:6379>sismember mySet 2   ---返回值为1,因为myset的Set成员中存在2.

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