Spring多数据源配置，这里持久层框架使用mybatis，集成Mybatis多数据源有两种方式：
1、创建多个SqlSessionFactory，扫描每个SqlSessionFactoryBean对应的包，形成了每个Factory对应一个数据源。
2、创建一个SqlSessionFactory，通过动态切换数据源对象，达到多数据源操作功能。
方式一：创建多个SqlSessionFactory
整合mysql+clickhouse双数据源
<!--mybatis + mysql + druid-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.23</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
<!--clickhouse-->
<dependency>
<groupId>ru.yandex.clickhouse</groupId>
<artifactId>clickhouse-jdbc</artifactId>
<version>0.1.53</version>
</dependency>
jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.master.url=jdbc:mysql://localhost:3306/test
jdbc.master.username=root
jdbc.master.password=root
jdbc.master.maxActive=10
jdbc.master.minIdle=5
jdbc.master.maxWait=10000
clickhouse.properties
clickhouse.driverClassName=ru.yandex.clickhouse.ClickHouseDriver
clickhouse.url=jdbc:clickhouse://localhost:8123/test
clickhouse.username=root
clickhouse.password=root
clickhouse.maxActive=10
clickhouse.minIdle=5
clickhouse.maxWait=10000
spring配置文件中配置多个数据源
<!--加载mysql+clickhouse配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<context:property-placeholder location="classpath:clickhouse.properties"/>
<!--=======================mysql数据源配置=======================-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.master.url}"/>
<property name="password" value="${jdbc.master.password}"/>
<property name="username" value="${jdbc.master.username}"/>
<property name="maxActive" value="${jdbc.master.maxActive}"/>
<property name="maxWait" value="${jdbc.master.maxWait}"/>
<property name="minIdle" value="${jdbc.master.minIdle}"/>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.demo.flash.price.redpot.entity"/>
<property name="mapperLocations" value="classpath:mysql_mapper/*.xml"/>
<property name="plugins">
<set>
<!--配置pageHelper 分页插件-->
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<props>
<!--方言：-->
<prop key="helperDialect">mysql</prop>
</props>
</property>
</bean>
</set>
</property>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.demo.flash.price.redpot.mapperMysql"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<!--=======================clickhouse数据源配置=======================-->
<bean id="dataSourceClickhouse" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${clickhouse.driverClassName}"/>
<property name="url" value="${clickhouse.url}"/>
<property name="password" value="${clickhouse.password}"/>
<property name="username" value="${clickhouse.username}"/>
<property name="maxActive" value="${clickhouse.maxActive}"/>
<property name="maxWait" value="${clickhouse.maxWait}"/>
<property name="minIdle" value="${clickhouse.minIdle}"/>
</bean>
<bean id="sqlSessionFactoryClickhouse" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="dataSource" ref="dataSourceClickhouse"/>
<property name="typeAliasesPackage" value="com.demo.flash.price.redpot.entity"/>
<property name="mapperLocations" value="classpath:clickhouse_mapper/*.xml"/>
<property name="plugins">
<set>
<!--配置pageHelper 分页插件-->
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<props>
<!--方言：-->
<prop key="helperDialect">mysql</prop>
</props>
</property>
</bean>
</set>
</property>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.demo.flash.price.redpot.mapperClickhouse"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryClickhouse"/>
</bean>
<bean id="transactionManagerClickhouse"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourceClickhouse"></property>
</bean>
<tx:annotation-driven transaction-manager="transactionManagerClickhouse" />
方式二：动态切换数据源对象
创建单个SqlSessionFactory，动态切换数据源对象 ，在Spring的jdbc包下有个支持动态数据源切换的抽象类AbstractRoutingDataSource，其中的抽象方法determineCurrentLookupKey需要我们自己来实现，到底返回哪个数据源
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
//在这里做数据源切换
return DataSourceTypeManager.get();
}
}public class DataSourceTypeManager {
//数据源保存
private static final ThreadLocal<MybatisDataSource> dataSourceTypes = new ThreadLocal<MybatisDataSource>() {
@Override
protected MybatisDataSource initialValue() {
return MybatisDataSource.JKDSJ;
}
};
public static MybatisDataSource get() {
return dataSourceTypes.get();
}
public static void set(MybatisDataSource dataSourceType) {
dataSourceTypes.set(dataSourceType);
}
public static void reset() {
dataSourceTypes.set(MybatisDataSource.JKDSJ);
}
}