Failing test involving Oracle's multiple result sets

a.k.a. implicit cursor ?
https://stackoverflow.com/q/42091653/1261766

Author: harawata

pom.xml

@@ -204,6 +204,12 @@
       <version>9.1.0</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.oracle.database.jdbc</groupId>
+      <artifactId>ojdbc8</artifactId>
+      <version>23.6.0.24.10</version>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
@@ -254,6 +260,12 @@
       <version>${testcontainers.version}</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.testcontainers</groupId>
+      <artifactId>oracle-free</artifactId>
+      <version>${testcontainers.version}</version>
+      <scope>test</scope>
+    </dependency>
     <!-- For javadoc link -->
     <dependency>
       <groupId>com.microsoft.sqlserver</groupId>

src/test/java/org/apache/ibatis/submitted/oracle_implicit_cursor/Author.java

@@ -0,0 +1,83 @@
+/*
+ *    Copyright 2009-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package org.apache.ibatis.submitted.oracle_implicit_cursor;
+
+import java.util.List;
+import java.util.Objects;
+
+public class Author {
+  private Integer id;
+  private String name;
+  private List<Book> books;
+
+  public Author() {
+    super();
+  }
+
+  public Author(Integer id, String name, List<Book> books) {
+    super();
+    this.id = id;
+    this.name = name;
+    this.books = books;
+  }
+
+  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 List<Book> getBooks() {
+    return books;
+  }
+
+  public void setBooks(List<Book> books) {
+    this.books = books;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(books, id, name);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!(obj instanceof Author)) {
+      return false;
+    }
+    Author other = (Author) obj;
+    return Objects.equals(books, other.books) && Objects.equals(id, other.id) && Objects.equals(name, other.name);
+  }
+
+  @Override
+  public String toString() {
+    return "Author [id=" + id + ", name=" + name + ", books=" + books + "]";
+  }
+}

src/test/java/org/apache/ibatis/submitted/oracle_implicit_cursor/Book.java

@@ -0,0 +1,72 @@
+/*
+ *    Copyright 2009-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package org.apache.ibatis.submitted.oracle_implicit_cursor;
+
+import java.util.Objects;
+
+public class Book {
+  private Integer id;
+  private String name;
+
+  public Book() {
+    super();
+  }
+
+  public Book(Integer id, String name) {
+    super();
+    this.id = id;
+    this.name = 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;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, name);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!(obj instanceof Book)) {
+      return false;
+    }
+    Book other = (Book) obj;
+    return Objects.equals(id, other.id) && Objects.equals(name, other.name);
+  }
+
+  @Override
+  public String toString() {
+    return "Book [id=" + id + ", name=" + name + "]";
+  }
+}

src/test/java/org/apache/ibatis/submitted/oracle_implicit_cursor/Mapper.java

@@ -0,0 +1,28 @@
+/*
+ *    Copyright 2009-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package org.apache.ibatis.submitted.oracle_implicit_cursor;
+
+import java.util.List;
+
+public interface Mapper {
+
+  List<Author> selectImplicitCursors_Statement();
+
+  List<Author> selectImplicitCursors_Prepared();
+
+  List<Author> selectImplicitCursors_Callable();
+
+}

src/test/java/org/apache/ibatis/submitted/oracle_implicit_cursor/OracleImplicitCursorTest.java

@@ -0,0 +1,78 @@
+/*
+ *    Copyright 2009-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package org.apache.ibatis.submitted.oracle_implicit_cursor;
+
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
+
+import java.util.List;
+import java.util.function.Function;
+
+import org.apache.ibatis.BaseDataTest;
+import org.apache.ibatis.mapping.Environment;
+import org.apache.ibatis.session.Configuration;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+import org.apache.ibatis.testcontainers.OracleTestContainer;
+import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+@Tag("TestcontainersTests")
+class OracleImplicitCursorTest {
+
+  private static SqlSessionFactory sqlSessionFactory;
+
+  @BeforeAll
+  static void setUp() throws Exception {
+    Configuration configuration = new Configuration();
+    Environment environment = new Environment("development", new JdbcTransactionFactory(),
+        OracleTestContainer.getUnpooledDataSource());
+    configuration.setEnvironment(environment);
+    configuration.addMapper(Mapper.class);
+    sqlSessionFactory = new SqlSessionFactoryBuilder().build(configuration);
+
+    BaseDataTest.runScript(sqlSessionFactory.getConfiguration().getEnvironment().getDataSource(),
+        "org/apache/ibatis/submitted/oracle_implicit_cursor/CreateDB.sql");
+  }
+
+  @Test
+  void shouldImplicitCursors_Statement() {
+    doTest(Mapper::selectImplicitCursors_Statement);
+  }
+
+  @Test
+  void shouldImplicitCursors_Prepared() {
+    doTest(Mapper::selectImplicitCursors_Prepared);
+  }
+
+  @Test
+  void shouldImplicitCursors_Callable() {
+    doTest(Mapper::selectImplicitCursors_Callable);
+  }
+
+  private void doTest(Function<Mapper, List<Author>> query) {
+    try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
+      Mapper mapper = sqlSession.getMapper(Mapper.class);
+      List<Author> authors = query.apply(mapper);
+      assertIterableEquals(
+          List.of(new Author(1, "John", List.of(new Book(1, "C#"), new Book(2, "Python"), new Book(5, "Ruby"))),
+              new Author(2, "Jane", List.of(new Book(3, "SQL"), new Book(4, "Java")))),
+          authors);
+    }
+  }
+}

src/test/java/org/apache/ibatis/testcontainers/OracleTestContainer.java

@@ -0,0 +1,57 @@
+/*
+ *    Copyright 2009-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package org.apache.ibatis.testcontainers;
+
+import javax.sql.DataSource;
+
+import org.apache.ibatis.datasource.pooled.PooledDataSource;
+import org.apache.ibatis.datasource.unpooled.UnpooledDataSource;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.oracle.OracleContainer;
+
+@Testcontainers
+public final class OracleTestContainer {
+
+  private static final String DB_NAME = "mybatis_test";
+  private static final String USERNAME = "u";
+  private static final String PASSWORD = "p";
+  private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";
+
+  @Container
+  private static final OracleContainer INSTANCE = initContainer();
+
+  private static OracleContainer initContainer() {
+    @SuppressWarnings("resource")
+    var container = new OracleContainer("gvenzl/oracle-free:slim-faststart").withDatabaseName(DB_NAME)
+        .withUsername(USERNAME).withPassword(PASSWORD);
+    container.start();
+    return container;
+  }
+
+  public static DataSource getUnpooledDataSource() {
+    return new UnpooledDataSource(OracleTestContainer.DRIVER, INSTANCE.getJdbcUrl(), OracleTestContainer.USERNAME,
+        OracleTestContainer.PASSWORD);
+  }
+
+  public static PooledDataSource getPooledDataSource() {
+    return new PooledDataSource(OracleTestContainer.DRIVER, INSTANCE.getJdbcUrl(), OracleTestContainer.USERNAME,
+        OracleTestContainer.PASSWORD);
+  }
+
+  private OracleTestContainer() {
+  }
+}

src/test/resources/org/apache/ibatis/submitted/oracle_implicit_cursor/CreateDB.sql

@@ -0,0 +1,49 @@
+--
+--    Copyright 2009-2025 the original author or authors.
+--
+--    Licensed under the Apache License, Version 2.0 (the "License");
+--    you may not use this file except in compliance with the License.
+--    You may obtain a copy of the License at
+--
+--       https://www.apache.org/licenses/LICENSE-2.0
+--
+--    Unless required by applicable law or agreed to in writing, software
+--    distributed under the License is distributed on an "AS IS" BASIS,
+--    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+--    See the License for the specific language governing permissions and
+--    limitations under the License.
+--
+
+-- @DELIMITER |
+begin
+  execute immediate 'drop table author';
+exception
+  when others then
+    if sqlcode != -942 then
+      raise;
+    end if;
+end;
+begin
+  execute immediate 'drop table book';
+exception
+  when others then
+    if sqlcode != -942 then
+      raise;
+    end if;
+end;
+|
+-- @DELIMITER ;
+
+create table author (id int, name varchar(10));
+
+insert into author (id, name) values (1, 'John');
+insert into author (id, name) values (2, 'Jane');
+
+
+create table book (id int, author_id int, name varchar(10));
+
+insert into book (id, author_id, name) values (1, 1, 'C#');
+insert into book (id, author_id, name) values (2, 1, 'Python');
+insert into book (id, author_id, name) values (3, 2, 'SQL');
+insert into book (id, author_id, name) values (4, 2, 'Java');
+insert into book (id, author_id, name) values (5, 1, 'Ruby');