How to use MyBatis’ ResultHandler to process the result set.

In MyBatis, you can use a ResultHandler to process query results. A ResultHandler is a callback interface that allows you to customize implementation to handle query results. Below are the general steps for using a ResultHandler to handle result sets.

1. Create a class that implements the ResultHandler interface, which needs to implement the handleResult method to handle query results.

public class MyResultHandler implements ResultHandler {
    @Override
    public void handleResult(ResultContext resultContext) {
        // 处理查询结果
        Object resultObject = resultContext.getResultObject();
        System.out.println(resultObject);
    }
}

1. Use ResultHandler to process the result set when querying.

try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
    MyResultHandler resultHandler = new MyResultHandler();
    sqlSession.select("namespace.selectStatement", parameter, resultHandler);
}

In the code above, the results of the selectStatement query are handled using MyResultHandler. The results of the query will be passed to the handleResult method of MyResultHandler for processing.

By using a custom ResultHandler, it is possible to implement more flexible and personalized processing logic to handle query results in a special way or add additional functionality.