Crazy God redis notes 03

redis Basic knowledge description of ：

redis The default is 16 A database ：

Let's go and have a look at our redis.conf The configuration file ：

We can see that there is indeed 16 A database .

  By default, the first one is 0 A database .

have access to select To switch databases ：

We can use select Switch database , It can be used dbsize Look at the size of the database . Different data can be stored in different databases .

We add a data to the database ：

Different databases can be used to store different values .

We can also use keys * View all of the database key

We can use flushall Empty all libraries .

It can also be used. flushdb Empty the current library ：

Redis It's single threaded ：

I emptied the previous Library .

Then we add another data ：

We can also use it here exists Determine whether a key exists ：

1 On behalf of there 0 nonexistence .

We are now using these commands in the native generation . Behind us we will use springboot To operate these commands to do the same thing .

We can also use move To move one of our key To another database .

We can use the database 1 See our this name The attribute is .

Now let's do some operations ：

Now let's set up our name The survival time is 10 second ,10 Seconds after the failure .

We can go through ttl see name The remaining life of , Here we can see ,name It's dead 2 The second .

We found that name It's gone .

We can put cookie Save it like this , You can also do hot news , Set the lifetime of hotspot data like this , Update after expiration . You can also use this when doing single sign on .

Now let's judge our key What kind of ：

We can see our current key All are string Type of , Later we will go set Some other types .