Demo for https://stackoverflow.com/q/73685798/1261766

Mapping two independent result sets.

so-73685798/README.md

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+Mapping two independent result sets.
+
+https://stackoverflow.com/q/73685798/1261766
+
+This demo requires a running MS SQL Server instance.
+You may need to edit the data source settings in /src/test/resources/test/mybatis-config.xml.
+
+Tested with
+
+- Microsoft SQL Server 15.00.4073
+- mssql-jdbc 11.1.2.jre8-preview
+
+```sh
+$ svn export https://github.com/harawata/mybatis-issues/trunk/so-73685798
+$ cd so-73685798
+$ mvn test
+```

so-73685798/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.mybatis.issues</groupId>
+  <artifactId>so-73685798</artifactId>
+  <packaging>jar</packaging>
+  <version>0.0.1-SNAPSHOT</version>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-core</artifactId>
+      <version>2.18.0</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.microsoft.sqlserver</groupId>
+      <artifactId>mssql-jdbc</artifactId>
+      <version>11.1.2.jre8-preview</version>
+    </dependency>
+    <dependency>
+      <groupId>org.mybatis</groupId>
+      <artifactId>mybatis</artifactId>
+      <version>3.5.11</version>
+    </dependency>
+  </dependencies>
+</project>

so-73685798/src/test/java/test/Artist.java

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+package test;
+
+public class Artist {
+  private Integer id;
+  private String name;
+
+  public Integer getId() {
+    return id;
+  }
+
+  public void setId(Integer id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+}

so-73685798/src/test/java/test/DivideOut.java

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+package test;
+
+import java.util.List;
+
+public class DivideOut {
+  public List<Movie> movie;
+  public List<Artist> artist;
+
+  public List<Movie> getMovie() {
+    return movie;
+  }
+
+  public void setMovie(List<Movie> movie) {
+    this.movie = movie;
+  }
+
+  public List<Artist> getArtist() {
+    return artist;
+  }
+
+  public void setArtist(List<Artist> artist) {
+    this.artist = artist;
+  }
+}

so-73685798/src/test/java/test/Mapper.java

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+package test;
+
+import java.util.List;
+
+public interface Mapper {
+  DivideOut selectMultiple();
+
+  List<List<?>> selectTwoLists();
+}

so-73685798/src/test/java/test/Movie.java

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+package test;
+
+public class Movie {
+  private Integer id;
+  private String name;
+  private Integer year;
+
+
+  public Integer getId() {
+    return id;
+  }
+
+  public void setId(Integer id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Integer getYear() {
+    return year;
+  }
+
+  public void setYear(Integer year) {
+    this.year = year;
+  }
+}

so-73685798/src/test/java/test/SimpleTest.java

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+package test;
+
+import static org.junit.Assert.*;
+
+import java.io.Reader;
+import java.sql.Connection;
+import java.util.List;
+
+import org.apache.ibatis.io.Resources;
+import org.apache.ibatis.jdbc.ScriptRunner;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class SimpleTest {
+
+  private static SqlSessionFactory sqlSessionFactory;
+
+  @BeforeClass
+  public static void setUp() throws Exception {
+    // create an SqlSessionFactory
+    try (Reader reader = Resources.getResourceAsReader("test/mybatis-config.xml")) {
+      sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
+    }
+    // prepare in-memory database
+    try (SqlSession session = sqlSessionFactory.openSession();
+        Connection conn = session.getConnection();
+        Reader reader = Resources.getResourceAsReader("test/CreateDB.sql")) {
+      ScriptRunner runner = new ScriptRunner(conn);
+      runner.setLogWriter(null);
+      runner.runScript(reader);
+    }
+  }
+
+  @Test
+  public void getOneDivideOut() {
+    try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
+      Mapper mapper = sqlSession.getMapper(Mapper.class);
+      DivideOut out = mapper.selectMultiple();
+      List<Movie> movies = out.movie;
+      assertEquals(3, movies.size());
+      assertEquals("Movie1", movies.get(0).getName());
+      assertEquals("Movie2", movies.get(1).getName());
+      assertEquals("Movie3", movies.get(2).getName());
+      List<Artist> artists = out.artist;
+      assertEquals(2, artists.size());
+      assertEquals("John", artists.get(0).getName());
+      assertEquals("Jane", artists.get(1).getName());
+    }
+  }
+
+  @Test
+  public void getTwoLists() {
+    try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
+      Mapper mapper = sqlSession.getMapper(Mapper.class);
+      List<List<?>> lists = mapper.selectTwoLists();
+      @SuppressWarnings("unchecked")
+      List<Movie> movies = (List<Movie>) lists.get(0);
+      assertEquals(3, movies.size());
+      assertEquals("Movie1", movies.get(0).getName());
+      assertEquals("Movie2", movies.get(1).getName());
+      assertEquals("Movie3", movies.get(2).getName());
+      @SuppressWarnings("unchecked")
+      List<Artist> artists = (List<Artist>) lists.get(1);
+      assertEquals(2, artists.size());
+      assertEquals("John", artists.get(0).getName());
+      assertEquals("Jane", artists.get(1).getName());
+    }
+  }
+
+}

so-73685798/src/test/resources/log4j2.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Configuration>
+  <Appenders>
+    <Console name="stdout" target="SYSTEM_OUT">
+      <PatternLayout pattern="%5p [%t] - %m%n" charset="utf-8" />
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Root level="trace">
+      <AppenderRef ref="stdout" />
+    </Root>
+  </Loggers>
+</Configuration>

so-73685798/src/test/resources/test/CreateDB.sql

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+drop table if exists Movie;
+drop table if exists Artist;
+
+create table Movie (
+  id_ int,
+  name_ varchar(20),
+  year_ int
+);
+create table Artist (
+  id_ int,
+  name_ varchar(20)
+);
+
+insert into Movie (id_, name_, year_) values (1, 'Movie1', 2020);
+insert into Movie (id_, name_, year_) values (2, 'Movie2', 2008);
+insert into Movie (id_, name_, year_) values (3, 'Movie3', 1988);
+
+insert into Artist (id_, name_) values (1, 'John');
+insert into Artist (id_, name_) values (2, 'Jane');

so-73685798/src/test/resources/test/Mapper.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="test.Mapper">
+
+  <resultMap id="movieResult" type="test.Movie">
+    <id property="id" column="id"/>
+    <result property="name" column="name"/>
+    <result property="year" column="year"/>
+  </resultMap>
+
+  <resultMap id="artistResult" type="test.Artist">
+    <id property="id" column="id"/>
+    <result property="name" column="name"/>
+  </resultMap>
+
+  <resultMap id="multipleQueriesResult" type="test.DivideOut" autoMapping="true">
+    <id column="parentId" />
+    <collection property="movie"
+                resultSet="movies"
+                resultMap="movieResult" />
+    <collection property="artist"
+                resultSet="artists"
+                resultMap="artistResult" />
+  </resultMap>
+
+  <select id="selectMultiple" resultSets="dummy,movies,artists"
+    resultMap="multipleQueriesResult" statementType="CALLABLE">
+    BEGIN
+      SELECT 1             AS parentId
+    END
+    BEGIN
+      SELECT
+             M.ID_         AS id,
+             M.NAME_       AS name,
+             M.YEAR_       AS year
+      FROM Movie AS M
+    END
+    BEGIN
+      SELECT A.ID_   AS id,
+             A.NAME_ AS name
+      FROM Artist AS A
+    END
+  </select>
+
+  <select id="selectTwoLists" resultMap="movieResult,artistResult"
+      statementType="CALLABLE">
+    BEGIN
+      SELECT
+             M.ID_         AS id,
+             M.NAME_       AS name,
+             M.YEAR_       AS year
+      FROM Movie AS M
+    END
+    BEGIN
+      SELECT A.ID_   AS id,
+             A.NAME_ AS name
+      FROM Artist AS A
+    END
+  </select>
+
+</mapper>

so-73685798/src/test/resources/test/mybatis-config.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration
+    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+    "http://mybatis.org/dtd/mybatis-3-config.dtd">
+
+<configuration>
+
+  <environments default="development">
+    <environment id="development">
+      <transactionManager type="JDBC">
+        <property name="" value="" />
+      </transactionManager>
+      <dataSource type="UNPOOLED">
+        <property name="driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
+        <property name="url" value="jdbc:sqlserver://127.0.0.1:1433;databaseName=test;encrypt=false" />
+        <property name="username" value="sa" />
+        <property name="password" value="Abcdefg7" />
+      </dataSource>
+    </environment>
+  </environments>
+
+  <mappers>
+    <mapper class="test.Mapper" />
+  </mappers>
+
+</configuration>