Spring3整合MyBatis3配置多数据源动态选择SqlSessionFactory详细教程

一、摘要

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这篇文章将介绍Spring整合Mybatis 如何完成SqlSessionFactory的动态切换的。并且会简单的介绍下MyBatis整合Spring中的官方的相关代码。

Spring整合MyBatis切换SqlSessionFactory有两种方法

第一、继承SqlSessionDaoSupport，重写获取SqlSessionFactory的方法。

第二、继承SqlSessionTemplate 重写getSqlSessionFactory、getConfiguration和SqlSessionInterceptor这个拦截器。其中最为关键还是继承SqlSessionTemplate 并重写里面的方法。

而Spring整合MyBatis也有两种方式，一种是配置MapperFactoryBean，另一种则是利用MapperScannerConfigurer进行扫描接口或包完成对象的自动创建。相对来说后者更方便些。

MapperFactoryBean继承了SqlSessionDaoSupport也就是动态切换SqlSessionFactory的第一种方法，我们需要重写和实现SqlSessionDaoSupport方法，或者是继承MapperFactoryBean来重写覆盖相关方法。如果利用MapperScannerConfigurer的配置整合来切换SqlSessionFactory，那么我们就需要继承SqlSessionTemplate，重写上面提到的方法。在整合的配置中很多地方都是可以注入SqlSessionTemplate代替SqlSessionFactory的注入的。因为SqlSessionTemplate的创建也是需要注入SqlSessionFactory的。

二、实现代码

1、继承SqlSessionTemplate 重写getSqlSessionFactory、getConfiguration和SqlSessionInterceptor

package com.hoo.framework.mybatis.support;
import static java.lang.reflect.Proxy.newProxyInstance;
import static org.apache.ibatis.reflection.ExceptionUtil.unwrapThrowable;
import static org.mybatis.spring.SqlSessionUtils.closeSqlSession;
import static org.mybatis.spring.SqlSessionUtils.getSqlSession;
import static org.mybatis.spring.SqlSessionUtils.isSqlSessionTransactional;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.exceptions.PersistenceException;
import org.apache.ibatis.executor.BatchResult;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.MyBatisExceptionTranslator;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.util.Assert;
/**
 * function: 继承SqlSessionTemplate 重写相关方法
 * @author hoojo
 * @createDate 2013-10-18 下午03:07:46
 * @file CustomSqlSessionTemplate.java
 * @package com.hoo.framework.mybatis.support
 * @project SHMB
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public class CustomSqlSessionTemplate extends SqlSessionTemplate {
 private final SqlSessionFactory sqlSessionFactory;
 private final ExecutorType executorType;
 private final SqlSession sqlSessionProxy;
 private final PersistenceExceptionTranslator exceptionTranslator;
 private Map targetSqlSessionFactorys;
 private SqlSessionFactory defaultTargetSqlSessionFactory;
 public void setTargetSqlSessionFactorys(Map targetSqlSessionFactorys) {
 this.targetSqlSessionFactorys = targetSqlSessionFactorys;
 }
 public void setDefaultTargetSqlSessionFactory(SqlSessionFactory defaultTargetSqlSessionFactory) {
 this.defaultTargetSqlSessionFactory = defaultTargetSqlSessionFactory;
 }
 public CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
 this(sqlSessionFactory, sqlSessionFactory.getConfiguration().getDefaultExecutorType());
 }
 public CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType) {
 this(sqlSessionFactory, executorType, new MyBatisExceptionTranslator(sqlSessionFactory.getConfiguration()
  .getEnvironment().getDataSource(), true));
 }
 public CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType,
  PersistenceExceptionTranslator exceptionTranslator) {
 super(sqlSessionFactory, executorType, exceptionTranslator);
 this.sqlSessionFactory = sqlSessionFactory;
 this.executorType = executorType;
 this.exceptionTranslator = exceptionTranslator;
 this.sqlSessionProxy = (SqlSession) newProxyInstance(
  SqlSessionFactory.class.getClassLoader(),
  new Class[] { SqlSession.class }, 
  new SqlSessionInterceptor());
 this.defaultTargetSqlSessionFactory = sqlSessionFactory;
 }
 @Override
 public SqlSessionFactory getSqlSessionFactory() {
 SqlSessionFactory targetSqlSessionFactory = targetSqlSessionFactorys.get(CustomerContextHolder.getContextType());
 if (targetSqlSessionFactory != null) {
  return targetSqlSessionFactory;
 } else if (defaultTargetSqlSessionFactory != null) {
  return defaultTargetSqlSessionFactory;
 } else {
  Assert.notNull(targetSqlSessionFactorys, "Property 'targetSqlSessionFactorys' or 'defaultTargetSqlSessionFactory' are required");
  Assert.notNull(defaultTargetSqlSessionFactory, "Property 'defaultTargetSqlSessionFactory' or 'targetSqlSessionFactorys' are required");
 }
 return this.sqlSessionFactory;
 }
 @Override
 public Configuration getConfiguration() {
 return this.getSqlSessionFactory().getConfiguration();
 }
 public ExecutorType getExecutorType() {
 return this.executorType;
 }
 public PersistenceExceptionTranslator getPersistenceExceptionTranslator() {
 return this.exceptionTranslator;
 }
 /**
 * {@inheritDoc}
 */
 public  T selectOne(String statement) {
 return this.sqlSessionProxy. selectOne(statement);
 }
 /**
 * {@inheritDoc}
 */
 public  T selectOne(String statement, Object parameter) {
 return this.sqlSessionProxy. selectOne(statement, parameter);
 }
 /**
 * {@inheritDoc}
 */
 public  Map selectMap(String statement, String mapKey) {
 return this.sqlSessionProxy. selectMap(statement, mapKey);
 }
 /**
 * {@inheritDoc}
 */
 public  Map selectMap(String statement, Object parameter, String mapKey) {
 return this.sqlSessionProxy. selectMap(statement, parameter, mapKey);
 }
 /**
 * {@inheritDoc}
 */
 public  Map selectMap(String statement, Object parameter, String mapKey, RowBounds rowBounds) {
 return this.sqlSessionProxy. selectMap(statement, parameter, mapKey, rowBounds);
 }
 /**
 * {@inheritDoc}
 */
 public  List selectList(String statement) {
 return this.sqlSessionProxy. selectList(statement);
 }
 /**
 * {@inheritDoc}
 */
 public  List selectList(String statement, Object parameter) {
 return this.sqlSessionProxy. selectList(statement, parameter);
 }
 /**
 * {@inheritDoc}
 */
 public  List selectList(String statement, Object parameter, RowBounds rowBounds) {
 return this.sqlSessionProxy. selectList(statement, parameter, rowBounds);
 }
 /**
 * {@inheritDoc}
 */
 public void select(String statement, ResultHandler handler) {
 this.sqlSessionProxy.select(statement, handler);
 }
 /**
 * {@inheritDoc}
 */
 public void select(String statement, Object parameter, ResultHandler handler) {
 this.sqlSessionProxy.select(statement, parameter, handler);
 }
 /**
 * {@inheritDoc}
 */
 public void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler) {
 this.sqlSessionProxy.select(statement, parameter, rowBounds, handler);
 }
 /**
 * {@inheritDoc}
 */
 public int insert(String statement) {
 return this.sqlSessionProxy.insert(statement);
 }
 /**
 * {@inheritDoc}
 */
 public int insert(String statement, Object parameter) {
 return this.sqlSessionProxy.insert(statement, parameter);
 }
 /**
 * {@inheritDoc}
 */
 public int update(String statement) {
 return this.sqlSessionProxy.update(statement);
 }
 /**
 * {@inheritDoc}
 */
 public int update(String statement, Object parameter) {
 return this.sqlSessionProxy.update(statement, parameter);
 }
 /**
 * {@inheritDoc}
 */
 public int delete(String statement) {
 return this.sqlSessionProxy.delete(statement);
 }
 /**
 * {@inheritDoc}
 */
 public int delete(String statement, Object parameter) {
 return this.sqlSessionProxy.delete(statement, parameter);
 }
 /**
 * {@inheritDoc}
 */
 public  T getMapper(Class type) {
 return getConfiguration().getMapper(type, this);
 }
 /**
 * {@inheritDoc}
 */
 public void commit() {
 throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
 }
 /**
 * {@inheritDoc}
 */
 public void commit(boolean force) {
 throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
 }
 /**
 * {@inheritDoc}
 */
 public void rollback() {
 throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
 }
 /**
 * {@inheritDoc}
 */
 public void rollback(boolean force) {
 throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
 }
 /**
 * {@inheritDoc}
 */
 public void close() {
 throw new UnsupportedOperationException("Manual close is not allowed over a Spring managed SqlSession");
 }
 /**
 * {@inheritDoc}
 */
 public void clearCache() {
 this.sqlSessionProxy.clearCache();
 }
 /**
 * {@inheritDoc}
 */
 public Connection getConnection() {
 return this.sqlSessionProxy.getConnection();
 }
 /**
 * {@inheritDoc}
 * @since 1.0.2
 */
 public List flushStatements() {
 return this.sqlSessionProxy.flushStatements();
 }
 /**
 * Proxy needed to route MyBatis method calls to the proper SqlSession got from Spring's Transaction Manager It also
 * unwraps exceptions thrown by {@code Method#invoke(Object, Object...)} to pass a {@code PersistenceException} to
 * the {@code PersistenceExceptionTranslator}.
 */
 private class SqlSessionInterceptor implements InvocationHandler {
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
  final SqlSession sqlSession = getSqlSession(
   CustomSqlSessionTemplate.this.getSqlSessionFactory(),
   CustomSqlSessionTemplate.this.executorType, 
   CustomSqlSessionTemplate.this.exceptionTranslator);
  try {
  Object result = method.invoke(sqlSession, args);
  if (!isSqlSessionTransactional(sqlSession, CustomSqlSessionTemplate.this.getSqlSessionFactory())) {
   // force commit even on non-dirty sessions because some databases require
   // a commit/rollback before calling close()
   sqlSession.commit(true);
  }
  return result;
  } catch (Throwable t) {
  Throwable unwrapped = unwrapThrowable(t);
  if (CustomSqlSessionTemplate.this.exceptionTranslator != null && unwrapped instanceof PersistenceException) {
   Throwable translated = CustomSqlSessionTemplate.this.exceptionTranslator
   .translateExceptionIfPossible((PersistenceException) unwrapped);
   if (translated != null) {
   unwrapped = translated;
   }
  }
  throw unwrapped;
  } finally {
  closeSqlSession(sqlSession, CustomSqlSessionTemplate.this.getSqlSessionFactory());
  }
 }
 }
}

重写后的getSqlSessionFactory方法会从我们配置的SqlSessionFactory集合targetSqlSessionFactorys或默认的defaultTargetSqlSessionFactory中获取Session对象。而改写的SqlSessionInterceptor 是这个MyBatis整合Spring的关键，所有的SqlSessionFactory对象的session都将在这里完成创建、提交、关闭等操作。所以我们改写这里的代码，在这里获取getSqlSessionFactory的时候，从多个SqlSessionFactory中获取我们设置的那个即可。

上面添加了targetSqlSessionFactorys、defaultTargetSqlSessionFactory两个属性来配置多个SqlSessionFactory对象和默认的SqlSessionFactory对象。

CustomerContextHolder 设置SqlSessionFactory的类型

package com.hoo.framework.mybatis.support;
/**
 * function: 多数据源
 * @author hoojo
 * @createDate 2013-9-27 上午11:36:57
 * @file CustomerContextHolder.java
 * @package com.hoo.framework.spring.support
 * @project SHMB
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public abstract class CustomerContextHolder {
 public final static String SESSION_FACTORY_MySQL = "mysql";
 public final static String SESSION_FACTORY_ORACLE = "oracle";
 private static final ThreadLocal contextHolder = new ThreadLocal(); 
 public static void setContextType(String contextType) { 
 contextHolder.set(contextType); 
 } 
 public static String getContextType() { 
 return contextHolder.get(); 
 } 
 public static void clearContextType() { 
 contextHolder.remove(); 
 } 
}

2、配置相关的文件applicationContext-session-factory.xml

<?xml version="1.0" encoding="UTF-8"?>

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
   
  classpath:com/hoo/framework/mybatis/mybatis-common.xml
  classpath:com/hoo/**/resultmap/*-resultmap.xml
  classpath:com/hoo/**/mapper/*-mapper.xml
  classpath:com/hoo/**/mapper/**/*-mapper.xml
  
 
 
 
 
 
 
  
 
  
   
  classpath:com/hoo/framework/mybatis/mybatis-common.xml
  classpath:com/hoo/**/resultmap/*-mysql-resultmap.xml
  classpath:com/hoo/**/mapper/*-mysql-mapper.xml
  classpath:com/hoo/**/mapper/**/*-mysql-mapper.xml
  classpath:com/hoo/**/mapper/**/multiple-datasource-mapper.xml

上面的配置关键是在MapperScannerConfigurer中注入sqlSessionTemplate，这个要注意。当我们配置了多个SqlSessionFactoryBean的时候，就需要为MapperScannerConfigurer指定一个sqlSessionFactoryBeanName或是sqlSessionTemplateBeanName。一般情况下注入了sqlSessionTemplateBeanName对象，那sqlSessionFactory也就有值了。如果单独的注入了sqlSessionFactory那么程序会创建一个sqlSessionTemplate对象。我们可以看看代码SqlSessionFactoryDaoSupport对象的代码。如果你不喜欢使用扫描的方式，也可以注入sqlSessionTemplate或继承sqlSessionTemplate完成数据库操作。

public abstract class SqlSessionDaoSupport extends DaoSupport {
 private SqlSession sqlSession;
 private boolean externalSqlSession;
 public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
 if (!this.externalSqlSession) {
 this.sqlSession = new SqlSessionTemplate(sqlSessionFactory);
 }
 }
 public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
 this.sqlSession = sqlSessionTemplate;
 this.externalSqlSession = true;
 }
......

这段代码很明显，如果注入了sqlSessionTemplate上面的注入也就不会执行了。如果没有注入sqlSessionTemplate，那么会自动new一个sqlSessionTemplate对象。

3、编写相关测试接口和实现的mapper.xml

package com.hoo.server.datasource.mapper;
import java.util.List;
import java.util.Map;
import com.hoo.framework.mybatis.SqlMapper;
/**
 * function: MyBatis 多数据源 测试查询接口
 * @author hoojo
 * @createDate 2013-10-10 下午04:18:08
 * @file MultipleDataSourceMapper.java
 * @package com.hoo.server.datasource.mapper
 * @project SHMB
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public interface MultipleDataSourceMapper extends SqlMapper {
 public List> execute4MySQL() throws Exception;
 public List> execute4Oracle() throws Exception;
}
multiple-datasource-mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>

上面分别查询oracle和mysql两个数据库中的table

4、测试代码

@Autowired
@Qualifier("multipleDataSourceMapper")
private MultipleDataSourceMapper mapper;
@Test
public void testMapper() {
 CustomerContextHolder.setContextType(CustomerContextHolder.SESSION_FACTORY_MYSQL);
 try {
 trace(mapper.execute4MySQL());
 } catch (Exception e1) {
 e1.printStackTrace();
 }
 CustomerContextHolder.setContextType(CustomerContextHolder.SESSION_FACTORY_ORACLE);
 try {
 trace(mapper.execute4Oracle());
 } catch (Exception e) {
 e.printStackTrace();
 }
}

运行后发现能够顺利查询出数据。

如果你是重写SqlSessionDaoSupport，那么方法如下

package com.hoo.framework.mybatis.support;
import java.util.Map;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionUtils;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
/**
 * function: MyBatis 动态SqlSessionFactory
 * @author hoojo
 * @createDate 2013-10-14 下午02:32:19
 * @file DynamicSqlSessionDaoSupport.java
 * @package com.hoo.framework.mybatis.support
 * @project SHMB
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public class DynamicSqlSessionDaoSupport extends SqlSessionDaoSupport implements ApplicationContextAware {
 private ApplicationContext applicationContext;
 private Map targetSqlSessionFactorys;
 private SqlSessionFactory defaultTargetSqlSessionFactory;
 private SqlSession sqlSession;
 @Override
 public final SqlSession getSqlSession() {
 SqlSessionFactory targetSqlSessionFactory = targetSqlSessionFactorys.get(CustomerContextHolder.getContextType());
 if (targetSqlSessionFactory != null) {
  setSqlSessionFactory(targetSqlSessionFactory);
 } else if (defaultTargetSqlSessionFactory != null) {
  setSqlSessionFactory(defaultTargetSqlSessionFactory);
  targetSqlSessionFactory = defaultTargetSqlSessionFactory;
 } else {
  targetSqlSessionFactory = (SqlSessionFactory) applicationContext.getBean(CustomerContextHolder.getContextType());
  setSqlSessionFactory(targetSqlSessionFactory);
 }
 this.sqlSession = SqlSessionUtils.getSqlSession(targetSqlSessionFactory);
 return this.sqlSession;
 }
 @Override
 protected void checkDaoConfig() {
 //Assert.notNull(getSqlSession(), "Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required");
 }
 public void setTargetSqlSessionFactorys(Map targetSqlSessionFactorys) {
 this.targetSqlSessionFactorys = targetSqlSessionFactorys;
 }
 public void setDefaultTargetSqlSessionFactory(SqlSessionFactory defaultTargetSqlSessionFactory) {
 this.defaultTargetSqlSessionFactory = defaultTargetSqlSessionFactory;
 }
 @Override
 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
 this.applicationContext = applicationContext;
 }
}

主要重写getSqlSession方法，上面获取SqlSessionFactory的方法。

重写好了后就可以配置这个对象，配置代码如下

//每一个DAO由继承SqlSessionDaoSupport全部改为DynamicSqlSessionDaoSupport 
public class UserMapperDaoImpl extends DynamicSqlSessionDaoSupport implements UserDao { 
 
 public int addUser(User user) {  
 return this.getSqlSession().insert("com.hoo.user.dao.UserDao.addUser", user); 
 } 
}

在上面的配置文件中加入配置

就这样也可以利用DynamicSqlSessionDaoSupport来完成动态切换sqlSessionFactory对象，只需用在注入userMapperDao调用方法的时候设置下CustomerContextHolder的contextType即可。

三、总结

为了实现这个功能看了mybatis-spring-1.2.0.jar这个包的部分源代码，代码内容不是很多。所以看了下主要的代码，下面做些简单的介绍。

MapperScannerConfigurer这个类就是我们要扫描的Mapper接口的类，也就是basePackage中继承markerInterface配置的接口。可以看看ClassPathBeanDefinitionScanner、ClassPathMapperScanner中的doScan这个方法。它会扫描basePackage这个包下所有接口，在ClassPathScanningCandidateComponentProvider中有这个方法findCandidateComponents，它会找到所有的BeanDefinition。

最重要的一点是ClassPathMapperScanner中的doScan这个方法它会给这些接口创建一个MapperFactoryBean。并且会检查sqlSessionFactory和sqlSessionTemplate对象的注入情况。

Spring3 整合MyBatis3 配置多数据源动态选择SqlSessionFactory详细教程

image 所以我们配置扫描的方式也就相当于我们在配置文件中给每一个Mapper配置一个MapperFactoryBean一样。而这个MapperFactoryBean又继承SqlSessionDaoSupport。所以当初我想重写MapperScannerConfigurer中的postProcessBeanDefinitionRegistry方法，然后重写方法中的ClassPathMapperScanner中的doScan方法，将definition.setBeanClass(MapperFactoryBean.class);改成自己定义的MapperFactoryBean。最后以失败告终，因为这里是Spring装载扫描对象的时候都已经为这些对象创建好了代理、设置好了mapperInterface和注入需要的类。所以在调用相关操作数据库的API方法的时候，设置对应的SqlSessionFactory也是无效的。

辗转反侧我看到了SqlSessionTemplate这个类，它的功能相当于SqlSessionDaoSupport的实现类MapperFactoryBean。最为关键的是SqlSessionTemplate有一个拦截器SqlSessionInterceptor，它复制所有SqlSession的创建、提交、关闭，而且是在每个方法之前。这点在上面也提到过了！所以我们只需要在SqlSessionInterceptor方法中获取SqlSessionFactory的时候，在这之前调用下CustomerContextHolder.setContextType方法即可完成数据库的SqlSessionFactory的切换。而在MapperScannerConfigurer提供了注入SqlSessionFactory和sqlSessionTemplate的方法，如果注入了SqlSessionFactory系统将会new一个sqlSessionTemplate，而注入了sqlSessionTemplate就不会创建其他对象（见下面代码）。所以我们配置一个sqlSessionTemplate并注入到MapperScannerConfigurer中，程序将会使用这个sqlSessionTemplate。本文最后的实现方式就是这样完成的。

public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
 if (!this.externalSqlSession) {
 this.sqlSession = new SqlSessionTemplate(sqlSessionFactory);
 }
}
public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
 this.sqlSession = sqlSessionTemplate;
 this.externalSqlSession = true;
}

以上所述是小编给大家介绍的Spring3 整合MyBatis3 配置多数据源动态选择SqlSessionFactory详细教程，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！

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