yangmain/mybatis-ex

This project is an extension of mybatis by using dynamic executor bound with current thread to solve 'Cannot change the ExecutorType when there is an existing transaction' for mybatis-spring project

##Introduction

这个项目是基于mybatis、mybatis-spring的扩展，主要用来解决：
'Cannot change the ExecutorType when there is an existing transaction'异常的！
即：在同一个Session中不能动态切换ExecutorType的问题！

##Maven 构件已经被发布到Maven**库中：

版本1.0.0 支持mybatis 3.2|3.3版本
版本1.0.1 支持mybatis 3.4版本	

<dependency>
	<groupId>com.github.penggle</groupId>
	<artifactId>mybatis-ex</artifactId>
	<version>1.0.1</version>
</dependency>

##Example

1、Simple usage as follows (No Spring integration) :

/**
 * returned DefaultExSqlSessionFactory as default
 */
public SqlSessionFactory getSqlSessionFactory() {
	InputStream inputStream = Resources.getResourceAsStream("mybatis/mybatis-config.xml");
	return new ExSqlSessionFactoryBuilder().build(inputStream);
}

public void testNormalInsertAndBatchInsert() throws Exception {
	SqlSession sqlSession = null;
	try {
		sqlSession = getSqlSessionFactory().openSession(ExecutorType.SIMPLE, false);
		//1、No-batch execution mode for insert
		for(int i = 1; i <= 5; i++){
			Product product = new Product(...);
			int affectedRow = sqlSession.insert(getMapperKey(Product.class, "insertProduct"), product);
			System.out.println(">>> inserted rows " + affectedRow);
		}
		
		//2、batch execution mode for insert by using BatchTemplate
		BatchTemplate batchTemplate = new BatchTemplate(sqlSession);
		List<Integer> batchResultList = batchTemplate.execute(new SqlSessionCallback<List<Integer>>(){
			public List<Integer> doInSqlSession(SqlSession sqlSession) {
				List<Integer> list = new ArrayList<Integer>();
				for(int i = 6; i <= 10; i++){
					Product product = new Product(...);
					sqlSession.insert(getMapperKey(Product.class, "insertProduct"), product);
				}
				BatchResultUtils.extractBatchResult(list, sqlSession.flushStatements());
				return list;
			}
		});
		System.out.println(">>> batch inserted rows " + batchResultList.size());
		sqlSession.commit();
	} catch(Exception e) {
		sqlSession.rollback();
		e.printStackTrace();
	} finally {
		if(sqlSession != null){
			sqlSession.close();
		}
	}
}

public void testInsertOrder() throws Exception {
	MainOrder mainOrder = new MainOrder(...);
	List<ChildOrder> childOrderList = new ArrayList<ChildOrder>();
	for(int i = 1; i <= 5; i++){
		ChildOrder childOrder = new ChildOrder(...);
		childOrderList.add(childOrder);
	}
	ExSqlSession sqlSession = null;
	try {
		sqlSession = (ExSqlSession) getSqlSessionFactory().openSession(ExecutorType.SIMPLE, false);
		//1、No-batch execution mode for insert
		int affectedRow = sqlSession.insert(getMapperKey(MainOrder.class, "insertMainOrder"), mainOrder);
		System.out.println(">>> inserted rows " + affectedRow);
		
		//2、batch execution mode for insert by using extension method
		int[] affectedRows = sqlSession.batchInsert(getMapperKey(ChildOrder.class, "insertChildOrder"), childOrderList);
		System.out.println(">>> inserted rows " + affectedRows.length);
		sqlSession.commit();
	} catch (Exception e) {
		sqlSession.rollback();
		e.printStackTrace();
	} finally {
		if(sqlSession != null){
			sqlSession.close();
		}
	}
}

2、Simple usage as follows (With Spring integration) :

2.1、Spring applicationContext.xml :

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
	...
</bean>

<bean id="jdbcTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
</bean>

<tx:annotation-driven transaction-manager="jdbcTransactionManager" proxy-target-class="true"/>

<bean id="sqlSessionFactory" class="com.penglecode.mybatis.ex.spring.SimpleExSqlSessionFactoryBean">
    <property name="configLocation" value="classpath:mybatis/spring/mybatis-config.xml"/>
    <property name="dataSource" ref="dataSource"/>
</bean>

<bean id="sqlSessionTemplate" class="com.penglecode.mybatis.ex.spring.ExSqlSessionTemplate">
	<constructor-arg index="0" ref="sqlSessionFactory"/>
	<constructor-arg index="1" value="SIMPLE"/>
</bean>

2.1、Java code: 

/**
 * sqlSessionTemplate actual type is ExSqlSessionTemplate
 */
@Resource(name="sqlSessionTemplate")
private ExSqlSession sqlSessionTemplate;

@Test
@Transactional(propagation=Propagation.REQUIRED,rollbackFor=Exception.class)
public void testInsertOrder() throws Exception {
	MainOrder mainOrder = new MainOrder(...);
	List<ChildOrder> childOrderList = new ArrayList<ChildOrder>();
	for(int i = 1; i <= 5; i++){
		ChildOrder childOrder = new ChildOrder(...);
		childOrderList.add(childOrder);
	}
	//1、No-batch execution mode for insert
	int affectedRow = sqlSessionTemplate.insert(getMapperKey(MainOrder.class, "insertMainOrder"), mainOrder);
	System.out.println(">>> inserted rows " + affectedRow);
	//2、batch execution mode for insert by using extension method
	int[] affectedRows = sqlSessionTemplate.batchInsert(getMapperKey(ChildOrder.class, "insertChildOrder"), childOrderList);
	System.out.println(">>> inserted rows " + affectedRows.length);
}