Redis Basic Learning (iii)-KEY operations

First, the relevant operation of key

1. Delete

Del key1 Key2 ... Keyn

Function: Delete 1 or more keys.

Return value: The nonexistent key is ignored, returning the number of really deleted keys.

2. Renaming

Rename Key Newkey

Function: Assign a new key to key name note: If Newkey already exists, then the Newkey's original value is overwritten.

3. Random key

Function: Returns the Random key.

4. Is there a key

Exists key

Function: Determines whether the key exists, returns 1/0.

5. Determine the type of key

Type key

Function: Returns the type of the value stored by key with String,link,set,order set, hash.

6. Query the valid time of key

TTL key

Function: Query Key's lifetime return: number of seconds.

7. Set the validity period of key

Expire key seconds

Function: Sets the life cycle of the key, in seconds.

Persist key

Function: Specifies that the key is permanently valid.

Redis Basic Learning (iii)-key actions