mybatis-plus selectOne

MyBatis-Plus is a popular Java persistence framework that extends the functionality of MyBatis. It provides additional features and simplifies the development of MyBatis-based applications.

In MyBatis-Plus, the `selectOne` method is used to query a single record from the database based on the specified conditions. It returns a single entity object that matches the query criteria.

Here is an example of using `selectOne` in MyBatis-Plus:

User user = new User();
user.setId(1);

User result = userMapper.selectOne(new QueryWrapper<>(user));

In this example, we create a `User` object and set the `id` property to 1. We then use `selectOne` method of the `userMapper` to query a single record from the database based on the `id` match.

Please note that `userMapper` is an instance of the MyBatis mapper interface, which is automatically generated by MyBatis-Plus based on your entity class. The `QueryWrapper` is used to specify the query conditions.

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