Java MyBatis Plus Query Example: Retrieving a User by Email

This code creates a new instance of the 'admin' class and then creates a 'QueryWrapper' object to query the database for a record with an email of '777888@qq.com'. It then calls the 'selectOne' method on the 'admin1' object, passing in the 'queryWrapper' as a parameter. This method returns an instance of the 'admin' class that matches the query criteria, which is then assigned to the 'admin2' variable. Finally, the code prints the value of 'admin2' to the console.