mybatis-plus set

MyBatis-Plus is a popular persistence framework for Java applications, which provides additional features and enhancements to the original MyBatis framework. When it comes to the "set" operation in MyBatis-Plus, it typically refers to updating records in a database table.

In MyBatis-Plus, you can use the `UpdateWrapper` or `LambdaUpdateWrapper` class to build update operations with the "set" clause. Here is an example of how to use the "set" operation in MyBatis-Plus:

UpdateWrapper<User> updateWrapper = new UpdateWrapper<>();
updateWrapper.set("name", "John")
            .set("age", 25)
            .eq("id", 1);

int affectedRows = userMapper.update(null, updateWrapper);

In this example, we create an `UpdateWrapper` instance and use the `set` method to specify the columns and their new values that we want to update. We then use other methods like `eq` to add conditions for the update operation, in this case, updating records with the ID equal to 1.

Finally, we call the `update` method on the mapper interface, passing `null` as the entity parameter because we are only updating specific columns without modifying other fields. The `update` method returns the number of affected rows.

This is just a basic example, and there are more advanced features available in MyBatis-Plus for complex update operations. You can refer to the official documentation or explore more examples to learn about other functionalities provided by MyBatis-Plus.