How do I create an object in MyBatis (Spring) mapper using select on a table (Spring)?

How do I create an object in MyBatis (Spring) mapper using select on a table (Spring)?

By : Radu Andrei
Date : November 17 2020, 01:00 AM
To fix the issue you can do It's all written in the documentation in the part where they mention the Advanced ResultMaps.
If your University class is something like this:
code :
public class University{
    private Long id;
    private String name;
    private List<Student> students;
    // getters, setters, etc.
public class Student{
    private String name_ofStudent;
    private Double GPA;
    private Integer age;
    private String major;
    private Long id;
    private Long universityId;
    // getters, setters, etc.
<select parameterType="Long" resultMap="UniversityResultMap">
    SELECT U.uni_id, U.uni_name, S.name_ofStudent, S.gpa, S.age, S.major, S.stu_id, S.stu_uni_id
    WHERE U.ID = #{id}
<resultMap id="StudentResultMap" resultMap="java.Student">
    <result column="NAME_OFSTUDENT" jdbcType="VARCHAR" property="name_ofStudent" />
    <result column="GPA" jdbcType="DECIMAL" property="GPA" />
    <result column="AGE" jdbcType="DECIMAL" property="age" />
    <result column="MAJOR" jdbcType="VARCHAR" property="major" />
    <result column="STU_ID" jdbcType="DECIMAL" property="id" />
    <result column="STU_UNI_ID" jdbcType="DECIMAL" property="universityId" />

<resultMap id="UniversityResultMap" parameterType="Long" resultMap="java.University">
    <id column="UNI_ID" jdbcType="DECIMAL" property="id" />
    <result column="NAME" jdbcType="VARCHAR" property="name" />
    <collection  property="students" ofType="java.Student" resultMap="StudentResultMap"/>

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NullPointerException using Spring to @autowire mybatis mapper

NullPointerException using Spring to @autowire mybatis mapper

By : Fabio Iommi
Date : March 29 2020, 07:55 AM
help you fix your problem When we are talking about the jars used we need to coordinate the specific annotations with their concerned domains:
@SpringBean annotation for action type beans @Autowire annotation for Spring type beans
Set different ExecutorType for a specific mybatis-spring mapper

Set different ExecutorType for a specific mybatis-spring mapper

By : Luc Dandrel
Date : March 29 2020, 07:55 AM
Hope that helps After a lot of tries, I decided to change my approach to solve this problem. I defined programmatically a new SqlSessionFactory, generating a new SqlSession with the Batch Executor and I used that one. Since it is an entirely different SqlSessionFactory, it seems it doesn't give problem if I use 2 differents ExecutorType. Here a sample working code:
code :
Environment environment = new Environment("TEST", new JdbcTransactionFactory(), dataSource);
        Configuration configuration = new Configuration(environment);

        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(configuration);
        SqlSession sqlSession = ssf.openSession(ExecutorType.BATCH);
        try {

            StagingFileMapper sfm = sqlSession.getMapper(StagingFileMapper.class);
            for(Record r : staging){
                StagingFile sf = new StagingFile();
                //set your sf fields
        } catch (Exception e) {
            //manage exception
Can I set Spring AOP pointcut on mybatis mapper?

Can I set Spring AOP pointcut on mybatis mapper?

By : rymac
Date : March 29 2020, 07:55 AM
it helps some times This question has been asked dozens of times here, and always by people who want to use Spring AOP, but never really bothered to look into its documentation or at least search StackOverflow before posting questions. How can you survive as a developer like this?
The short answer is:
How can we map multiple tables in Mapper.xml using mybatis-spring?

How can we map multiple tables in Mapper.xml using mybatis-spring?

By : Heinja
Date : March 29 2020, 07:55 AM
around this issue I'm not sure if I understand your question correctly. If you are talking about how to deal with different tables, it's not a good practice to use one single mapper. It's better to split it and register your mappers in many ways. One of the examples is
code :
  <mapper resource="org/mybatis/builder/AuthorMapper.xml"/>
  <mapper resource="org/mybatis/builder/BlogMapper.xml"/>
  <mapper resource="org/mybatis/builder/PostMapper.xml"/>
How to write two parasmeters in Spring MyBatis Mapper?

How to write two parasmeters in Spring MyBatis Mapper?

By : akalest0s
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The problem with the current approach
You currently your mapping set up in a way that doesn't accept your parameters into the DAO layer parameterType="java.util.HashMap"
code :
public List<HashMap<String, Object>> getBoardCommentOfComment(int board_idx, int board_comm_idx) 
   HashMap<String, Object> parameters = new HashMap<String, Object>();
   parameters.put("board_idx", board_idx);
   parameters.put("board_comm_idx", board_comm_idx");
   List<HashMap<String, Object>> c_of_c_list = boardDao.selectCommentOfComment(board_idx, board_comm_idx);
   return c_of_c_list;
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