Spring多数据源配置

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

    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatis-springartifactId>
      <version>2.0.6version>
    dependency>
    <dependency>
      <groupId>com.alibabagroupId>
      <artifactId>druidartifactId>
      <version>1.1.23version>
    dependency>
    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatisartifactId>
      <version>3.4.5version>
    dependency>
    <dependency>
      <groupId>mysqlgroupId>
      <artifactId>mysql-connector-javaartifactId>
      <version>5.1.49version>
    dependency>
    
    <dependency>
      <groupId>ru.yandex.clickhousegroupId>
      <artifactId>clickhouse-jdbcartifactId>
      <version>0.1.53version>
    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

    <context:property-placeholder location="classpath:jdbc.properties"/>
    <context:property-placeholder location="classpath:clickhouse.properties"/>
 
    
    <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>
                
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            
                            <prop key="helperDialect">mysqlprop>
                        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" />
 
    
    <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>
                
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            
                            <prop key="helperDialect">mysqlprop>
                        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 dataSourceTypes = new ThreadLocal() {
		 
		@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);
	}
 
}

【SpringBoot DB 系列】Mybatis 基于 AbstractRoutingDataSource 与 AOP 实现多数据源切换_一灰灰blog的博客-CSDN博客