mybatis plus updateById

MyBatis Plus provides a convenient method called `updateById` for updating records in the database based on the primary key. This method allows you to update a single record by specifying the primary key value and the updated values.

Here's an example of using `updateById` in MyBatis Plus:

// Assuming you have a mapper interface called UserMapper

// Create an instance of the entity class with the updated values
User user = new User();
user.setId(1L); // Assuming 1 is the primary key value
user.setName("New Name");
user.setAge(25);

// Call the updateById method on the mapper interface
userMapper.updateById(user);

In this example, we first create an instance of the entity class `User` with the updated values. Then, we call the `updateById` method on the `UserMapper` interface, passing in the updated `User` object.

This method will generate an update SQL statement based on the entity class and update the record in the database with the specified primary key value.

I hope this helps! Let me know if you have any more questions.