1. Create a user
GRANT
{
SELECT, UPDATE, DELETE, INSERT (permission), ALL (representing all privileges)
}
ON database.table to 'username'@'host IP' identified by 'password';
FOR EXAMPLE：
GRANT SELECT ON testdb.testtable TO 'user'@'%' identified by '123456';
Create a user named user with a password of 123456. All IPs can log in with this username and password, and have the SELECT query permission on the testtable table of the testdb database;
2. View permissions
show grants for user;
Notice:
In general, this is enough, you can read all table data in the database, modify and insert data into the specified database table;
Sometimes you may find that you have authorized and refreshed the permissions, but your permissions do not seem to be successful, so you should use the following tricks, and then you can!
The trick below:
show variables like 'read_only';
If found to be ON, change to OFF
set GLOBAL read_only = OFF;
flush privileges;
In this way, it is found that the permissions set before can work;