多数据源的配置有多种方式

方式一 、依赖dataSource的配置

1.建立多数据源配置

spring:# 数据源配置datasource:pdm:driver-class-name: oracle.jdbc.driver.OracleDriverjdbc-url: jdbc:oracle:thin:@10.216.xxx.xxx:3000:orclusername: cfpdmpassword: capecapp:driver-class-name: oracle.jdbc.driver.OracleDriverjdbc-url: jdbc:oracle:thin:@42.193.xx1.xx1:1521:MDMSusername: capppassword: capecpsmds:driver-class-name: oracle.jdbc.driver.OracleDriverjdbc-url: jdbc:oracle:thin:@42.193.xx2.xx2:1521:MDMSusername: cpsmdspassword: cape

2. 将数据源datasource注入到PlatformTransactionManager 事务管理器中,并注入数据源至AbstractRoutingDataSource 多数据源路由bean中

@Configuration
public class DateSourceConfig {@Bean("pdmDataSource")@ConfigurationProperties("spring.datasource.pdm")public DataSource masterDataSource(){return DataSourceBuilder.create().build();}@Bean("cappDataSource")@ConfigurationProperties("spring.datasource.capp")public DataSource cappDataSource(){return DataSourceBuilder.create().build();}@Bean("cpsmdsDataSource")@ConfigurationProperties("spring.datasource.cpsmds")public DataSource cpsmdsDataSource(){return DataSourceBuilder.create().build();}@Bean("pdm")public PlatformTransactionManager pdmTransactionManager(@Qualifier("pdmDataSource")DataSource pdmDataSource) {return new DataSourceTransactionManager(pdmDataSource);}@Bean("capp")public PlatformTransactionManager cappTransactionManager(@Qualifier("cappDataSource")DataSource cappDataSource) {return new DataSourceTransactionManager(cappDataSource);}@Bean("cpsmds")public PlatformTransactionManager cpsmdsTransactionManager(@Qualifier("cpsmdsDataSource")DataSource cpsmdsDataSource) {return new DataSourceTransactionManager(cpsmdsDataSource);}@Bean(name = "dynamicDataSource")@Primarypublic DynamicDataSource createDynamicDataSource(){Map<Object,Object> dataSourceMap = new HashMap<>();DataSource defaultDataSource = masterDataSource();dataSourceMap.put("pdm",defaultDataSource);dataSourceMap.put("capp",cappDataSource());dataSourceMap.put("cpsmds",cpsmdsDataSource());return new DynamicDataSource(defaultDataSource,dataSourceMap);}
}

3.多数据源路由AbstractRoutingDataSource 实现类

package avicit.pdm.config;import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;import javax.sql.DataSource;
import java.util.Map;public class DynamicDataSource  extends AbstractRoutingDataSource {public DynamicDataSource(DataSource defaultDataSource, Map<Object, Object> targetDataSources){super.setDefaultTargetDataSource(defaultDataSource);super.setTargetDataSources(targetDataSources);}@Overrideprotected Object determineCurrentLookupKey() {return DataSourceContextHolder.getDataSource();}
}

4.建立多数据源切换切面
根据调用的dao层包名，确定使用的多数据数是哪一个，通过DataSourceContextHolder 注入制定的数据源

@Aspect
@Component
@Slf4j
public class VpdmDSAspect {@Pointcut("execution(* avicit..*.dao.*.*(..))")public void dynamicDataSource(){}@Around("dynamicDataSource()")public Object datasourceAround(ProceedingJoinPoint point) throws Throwable {String name =  point.getSignature().getDeclaringType().getName();if(name.contains("avicit.pdm")){DataSourceContextHolder.setDataSource("pdm");}else{MethodSignature signature = (MethodSignature)point.getSignature();Method method = signature.getMethod();DS ds = method.getAnnotation(DS.class);if (Objects.nonNull(ds)){DataSourceContextHolder.setDataSource(ds.value());}else{DataSourceContextHolder.setDataSource("capp");}}try {return point.proceed();} finally {DataSourceContextHolder.removeDataSource();}}
}

5. 多数据源事务配置
   项目中遇到Transactional 事务时候需要在事务中指定value中指定具体的数据源

6. MapperScan扫描加载包下的dao和SpringBootApplication扫描制定包的bean

@MapperScan("QAZWSC.**.dao")
@SpringBootApplication(scanBasePackages = {"QAZWSC"})
@EnableTransactionManagement
@EnableKnife4j
public class XxxxApplication {public static void main(String[] args) {SpringApplication.run(XxxxApplication .class, args);}}

方式二、通过mybatis Plus的多数据源管理方案

通过mybatis的@DS 注解切换 数据源

1. 指定主数据源,通过primary 指定默认的主数据源

spring:datasource:dynamic:primary: cappdatasource:capp:driver-class-name: oracle.jdbc.driver.OracleDriverurl: jdbc:oracle:thin:@42.193.xx1.xx1:1521:MDMSusername: capppassword: capecpsmds:driver-class-name: oracle.jdbc.driver.OracleDriverurl: jdbc:oracle:thin:@42.193.xx1.xx1:1521:MDMSusername: cpsmdspassword: cape

2.在dao层制定要使用的数据源

@DS("cpsmds")
public interface MdsProductDAO {}