SpringMvc+Mybatis多数据源配置

业务场景：我们开发一个webService服务，这个服务，要对很多的数据库访问

                 对外提供数据接口~(一个项目连接多个数据库)

解决思路：一个项目对应多个数据库，就应该是一个项目有多个数据源，多个sqlSessionFactory，

                 多个事物，然后调用不同的controle或action访问

                不同的持久层达到访问不同数据库来解决问题！

 

上代码（一）：基于配置实现

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
    <property name="url" value="${center.connectionURL}"/>
    <property name="username"  value="${userName}"/>
    <property name="password" value="${password}"/>
</bean>
<!--
或者基于jndi的数据源也OK 
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.xxx.dao.center"/>
    <property name="sqlSessionFactoryBeanName" value="cneterSqlSessionFactory"/>
</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" name="cneterSqlSessionFactory">
    <property name="dataSource" ref="dataSource"></property>
    <property name="mapperLocations" value="classpath*:mapperConfig/center/*.xml"/>
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
    <qualifier value="oracle" />  
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<!--center db end-->
<!--exdb-->
<bean id="dataSourceEx" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
    <property name="url" value="${ex.connectionURL}"/>
    <property name="username"  value="${userName}"/>
    <property name="password" value="${password}"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.xxx.dao.ex"/>
    <property name="sqlSessionFactoryBeanName" value="exSqlSessionFactory"/>
</bean>
<bean id="sqlSessionFactoryEx" class="org.mybatis.spring.SqlSessionFactoryBean" name="exSqlSessionFactory">
    <property name="dataSource" ref="dataSourceEx"></property>
    <property name="mapperLocations" value="classpath*:mapperConfig/ex/*.xml"/>
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<bean id="transactionManagerEx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSourceEx"/>
    <qualifier value="mysql" />  
</bean>

 上代码（二）：基于注解（参考，并未亲测）

import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.type.JdbcType;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.jdbc.datasource.lookup.JndiDataSourceLookup;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.sql.DataSource;

@Configuration
@ComponentScan(basePackages = "com.mycompany")
@EnableTransactionManagement(proxyTargetClass = true)
public class ApplicationConfig2 {
    public static final String DATA_SOURCE_NAME_1 = "jdbc/dataSource1";
    public static final String DATA_SOURCE_NAME_2 = "jdbc/dataSource2";

    public static final String SQL_SESSION_FACTORY_NAME_1 = "sqlSessionFactory1";
    public static final String SQL_SESSION_FACTORY_NAME_2 = "sqlSessionFactory2";

    public static final String MAPPERS_PACKAGE_NAME_1 = "com.mycompany.mappers.dao1";
    public static final String MAPPERS_PACKAGE_NAME_2 = "com.mycompany.mappers.dao2";

    @Bean
    public DataSource dataSource1() {
        JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
        return dsLookup.getDataSource(DATA_SOURCE_NAME_1);
    }

    @Bean
    public DataSource dataSource2() {
        JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
        return dsLookup.getDataSource(DATA_SOURCE_NAME_2);
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }


    @Bean(name = SQL_SESSION_FACTORY_NAME_1)
    public SqlSessionFactory sqlSessionFactory1(DataSource dataSource1) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setTypeHandlersPackage(DateTimeTypeHandler.class.getPackage().getName());
        sqlSessionFactoryBean.setDataSource(dataSource1);
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBean.getObject();
        sqlSessionFactory.getConfiguration().setMapUnderscoreToCamelCase(true);
        sqlSessionFactory.getConfiguration().setJdbcTypeForNull(JdbcType.NULL);
        return sqlSessionFactory;
    }

    @Bean(name = SQL_SESSION_FACTORY_NAME_2)
    public SqlSessionFactory sqlSessionFactory2(DataSource dataSource2) throws Exception {
        SqlSessionFactoryBean diSqlSessionFactoryBean = new SqlSessionFactoryBean();
        diSqlSessionFactoryBean.setTypeHandlersPackage(DateTimeTypeHandler.class.getPackage().getName());
        diSqlSessionFactoryBean.setDataSource(dataSource2);
        SqlSessionFactory sqlSessionFactory = diSqlSessionFactoryBean.getObject();
        sqlSessionFactory.getConfiguration().setMapUnderscoreToCamelCase(true);
        sqlSessionFactory.getConfiguration().setJdbcTypeForNull(JdbcType.NULL);
        return sqlSessionFactory;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer1() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage(MAPPERS_PACKAGE_NAME_1);
        configurer.setSqlSessionFactoryBeanName(SQL_SESSION_FACTORY_NAME_1);
        return configurer;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer2() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage(MAPPERS_PACKAGE_NAME_2);
        configurer.setSqlSessionFactoryBeanName(SQL_SESSION_FACTORY_NAME_2);
        return configurer;
    }
}

  上代码（三）：基于注解（亲测实现，需要注意MapperScannerConfigurer防止死循环出现放到配置中）

// datasource1
@Configuration
@Profile("default")
@PropertySource("file:${xxx.config.path}/xxx.properties")
public class DataSourceConfig {

    @Autowired
    private Environment env;

    @Bean(name = "dataSource1")
    public DataSource dataSource1() {
        final JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
        dsLookup.setResourceRef(true);
        return dsLookup.getDataSource(env.getRequiredProperty("xxx.datasource.name1"));
    }
}

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
public class IocMappingConfig {
	
    @Autowired
    @Qualifier("dataSource1")
    private DataSource dataSource1;

    @Bean(name="sqlSessionFactoryBean")
    public SqlSessionFactoryBean sqlSessionFactoryBean() throws SQLException, IOException {
        SqlSessionFactoryBean sqlSessionFactory = new SqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(dataSource1);
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactory.setMapperLocations(resolver.getResources("com/xxx/mapping1/*.xml"));
        return sqlSessionFactory;
    }

    // 下面用配置替换，避免死循环(分割多spring-application-config可解决此问题)
//    @Bean
//    public MapperScannerConfigurer mappperConfigurer(){
//        MapperScannerConfigurer msc = new MapperScannerConfigurer();
//        msc.setBasePackage("com.xxx.mapping1");
//        msc.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
//        // 对应的接口
//        return msc;
//    }
    
	@Bean
	@Qualifier("utils") // 用于逻辑层事物的区分(@Transactional(value="utils",propagation=Propagation.REQUIRED,rollbackFor=Exception.class))
	public DataSourceTransactionManager transactionManager() throws SQLException{
		DataSourceTransactionManager txManager = new DataSourceTransactionManager();
		txManager.setDataSource(dataSource1);
		return txManager;
	}
	
}

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.xxx.mapping1" />
		<property name="SqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
	</bean>

// datasource2
@Configuration
@Profile("default")
@PropertySource("file:${xxx.config.path}/xxx.properties")
public class DataSourceConfig {

    @Autowired
    private Environment env;

    @Bean(name = "dataSource2")
    public DataSource dataSource2() {
        final JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
        dsLookup.setResourceRef(true);
        return dsLookup.getDataSource(env.getRequiredProperty("xxx.datasource.name2"));
    }
}

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
public class IocMappingConfig {
	
    @Autowired
    @Qualifier("dataSource2")
    private DataSource dataSource2;

    @Bean(name="sqlSessionFactoryBean2")
    public SqlSessionFactoryBean sqlSessionFactoryBean2() throws SQLException, IOException {
        SqlSessionFactoryBean sqlSessionFactory = new SqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(dataSource2);
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactory.setMapperLocations(resolver.getResources("com/xxx/mapping2/*.xml"));
        return sqlSessionFactory;
    }

    // 下面用配置替换，避免死循环(分割多spring-application-config可解决此问题)
//    @Bean
//    public MapperScannerConfigurer mappperConfigurer2(){
//        MapperScannerConfigurer msc = new MapperScannerConfigurer();
//        msc.setBasePackage("com.xxx.mapping2");
//        msc.setSqlSessionFactoryBeanName("sqlSessionFactoryBean2");
//        // 对应的接口
//        return msc;
//    }
    
	@Bean
	@Qualifier("utils2") // 用于逻辑层事物的区分(@Transactional(value="utils2",propagation=Propagation.REQUIRED,rollbackFor=Exception.class))
	public DataSourceTransactionManager transactionManager2() throws SQLException{
		DataSourceTransactionManager txManager = new DataSourceTransactionManager();
		txManager.setDataSource(dataSource2);
		return txManager;
	}
	
}

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.xxx.mapping2" />
		<property name="SqlSessionFactoryBeanName" value="sqlSessionFactoryBean2"/>
	</bean>

 单元测用H2数据库也是两套，数据源名字要对应，此处就不重复写了

 参考地址：http://zhuchengzzcc.iteye.com/blog/1827633

                   http://stackoverflow.com/questions/18201075/mybatis-spring-multiple-databases-java-configuration