redis determines whether key exists

The Redis EXISTS command is used to check whether a given key exists.

Recommended manual： Redis command operation Chinese manual

redis EXISTS command The basic syntaxis as follows:

redis 127.0.0.1:6379> EXISTS KEY_NAME

Available version>= 1.0.0

Return value

If the key exists, return 1, otherwise return 0.

Example

redis 127.0.0.1:6379> EXISTS w3cschoolcc-new-key (integer) 0

Now we create a key named w3cschoolcc-new-key and assign a value, and then use the EXISTS command.

redis 127.0.0.1:6379> set w3cschoolcc-new-key newkey OK redis 127.0.0.1:6379> EXISTS w3cschoolcc-new-key (integer) 1 redis 127.0.0.1:6379>

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