Springboot整合多数据源代码示例详解

最近有个老项目想逐步将新业务的数据放到新的数据库，以前的业务还得连接以前的数据库，于是需要整合多数据源 。

多数据源实际上是继承了AbstractRoutingDataSource类，这个类最终实现了DataSource接口，DataSource里只有一个getConnection方法，数据库每次访问的时候都要先通过这个方法获取连接，所有多数据源就是每次访问数据库之前动态的改变数据源。

在请求前改变数据源当然需要用到SpringAOP，自定义注解操作

项目结构

下面上代码：

首先是依赖：

<!--数据库连接--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!--sqlserver--> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>mssql-jdbc</artifactId> <scope>runtime</scope> </dependency> <!--mybatis-plus--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.2</version> </dependency> <!--数据库连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.8</version> </dependency><!--AOP--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency>

yml配置数据源

server: port: 8888spring: jackson: time-zone: GMT+8 date-format: yyyy-MM-dd HH:mm:ss datasource: druid: first: driver-class-name: com.mysql.cj.jdbc.Driver type: com.alibaba.druid.pool.DruidDataSource jdbc-url: jdbc:mysql://rm-uf6265pj340sc9447oo.mysql.rds.54565.com:3306/dm?serverTimezone=Asia/Shanghai&useSSL=false&allowPublicKeyRetrieval=true&characterEncoding=utf-8 username: username password: password second: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver jdbc-url: jdbc:sqlserver://39.104.203.222:1433;DatabaseName=TestTLcom username: root password: 123456mybatis-plus: mapper-locations: classpath*:/mapper/*Mapper.xml type-aliases-package: com.zdyl.dynamicdatasourcedemo.entity global-config: #主键类型 0:'数据库ID自增', 1:'用户输入ID',2:'全局唯一ID (数字类型唯一ID)', 3:'全局唯一ID UUID'; id-type: 3 #字段策略 0:'忽略判断',1:'非 NULL 判断'),2:'非空判断' field-strategy: 2 #驼峰下划线转换 db-column-underline: true #刷新mapper 调试神器 refresh-mapper: true #数据库大写下划线转换 #capital-mode: true #序列接口实现类配置 #key-generator: com.baomidou.springboot.xxx #逻辑删除配置 #logic-delete-value: 0 #logic-not-delete-value: 1 #自定义填充策略接口实现 #meta-object-handler: com.baomidou.springboot.xxx #自定义SQL注入器 #sql-injector: com.baomidou.springboot.xxx configuration: map-underscore-to-camel-case: true cache-enabled: false

定义数据库名称

/** * 数据库名称 */public interface DataSourceNames { String FIRST = 'first'; String SECOND = 'second';}

动态数据源

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;import javax.sql.DataSource;import java.util.HashMap;import java.util.Map;/** * 动态数据源 */public class DynamicDataSource extends AbstractRoutingDataSource { private static final ThreadLocal<String> contextHolder = new ThreadLocal<>(); public DynamicDataSource(DataSource defaultTargetDataSource, Map<String, DataSource> targetDataSources) { super.setDefaultTargetDataSource(defaultTargetDataSource); super.setTargetDataSources(new HashMap<>(targetDataSources)); super.afterPropertiesSet(); } @Override protected Object determineCurrentLookupKey() { return getDataSource(); } public static String getDataSource() { return contextHolder.get(); } public static void setDataSource(String dataSource) { contextHolder.set(dataSource); } public static void clearDataSource() { contextHolder.remove(); }}

配置多数据源

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;import com.zdyl.dynamicdatasourcedemo.dynamicdatasource.DataSourceNames;import com.zdyl.dynamicdatasourcedemo.dynamicdatasource.DynamicDataSource;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.jdbc.DataSourceBuilder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import javax.sql.DataSource;import java.util.HashMap;import java.util.Map;/** * 多数据源配置 */@Configuration@MapperScan('com.zdyl.dynamicdatasourcedemo.**.mapper*')public class MybatisPluConfig { /** * 数据源配置 * @return */ @Bean @ConfigurationProperties(prefix='spring.datasource.druid.first') public DataSource firstDataSource() { return DataSourceBuilder.create().build(); } @Bean @ConfigurationProperties(prefix='spring.datasource.druid.second') public DataSource secondDataSource() { return DataSourceBuilder.create().build(); } @Bean @Primary public DynamicDataSource dataSource(DataSource firstDataSource, DataSource secondDataSource){ Map<String, DataSource> targetDataSources = new HashMap<>(); targetDataSources.put(DataSourceNames.FIRST, firstDataSource); targetDataSources.put(DataSourceNames.SECOND, secondDataSource); return new DynamicDataSource(firstDataSource, targetDataSources); } /** * mybatis-plus分页插件<br> * 文档：http://mp.baomidou.com<br> */ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); }}

下面就是自定义注解

import java.lang.annotation.*;/** * 多数据源注解 * AOP拦截此注解更换数据源 */@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface CurDataSource { String name() default '';}

AOP

import com.zdyl.dynamicdatasourcedemo.dynamicdatasource.DataSourceNames;import com.zdyl.dynamicdatasourcedemo.dynamicdatasource.DynamicDataSource;import com.zdyl.dynamicdatasourcedemo.dynamicdatasource.annotation.CurDataSource;import lombok.extern.slf4j.Slf4j;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.core.Ordered;import org.springframework.stereotype.Component;import java.lang.reflect.Method;/** * 多数据源，切面处理类 * AOP拦截多数据源注解 @CurDataSource 注解更换数据源 */@Slf4j@Aspect@Componentpublic class DataSourceAspect implements Ordered { /** * 切点 */ @Pointcut('@annotation(com.zdyl.dynamicdatasourcedemo.dynamicdatasource.annotation.CurDataSource)') public void dataSourcePointCut() { } @Around('dataSourcePointCut()') public Object around(ProceedingJoinPoint point) throws Throwable { MethodSignature signature = (MethodSignature) point.getSignature(); Method method = signature.getMethod(); CurDataSource curDataSource = method.getAnnotation(CurDataSource.class); if (curDataSource == null) { DynamicDataSource.setDataSource(DataSourceNames.FIRST); log.info('set datasource is ' + DataSourceNames.FIRST); } else { DynamicDataSource.setDataSource(curDataSource.name()); log.info('set datasource is ' + curDataSource.name()); } try { return point.proceed(); } finally { DynamicDataSource.clearDataSource(); log.info('clean datasource'); } } @Override public int getOrder() { return 1; }}

最后主启动了去掉数据源自动加载

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

最后我们来跑起来请求一下，测试一下是否正确

@RestControllerpublic class CfgDeviceController { @Resource CfgDeviceService cfgDeviceService; @Resource CfgChargeStartInfoService cfgChargeStartInfoService; @CurDataSource(name = DataSourceNames.FIRST) @GetMapping('/test') public void getUser() { CfgDevice byId = cfgDeviceService.getById(19); System.out.println(byId.toString()); } @CurDataSource(name = DataSourceNames.SECOND) @GetMapping('/test1') public void getUser1() { CfgChargeStartInfo byId = cfgChargeStartInfoService.getById(1); System.out.println(byId.toString()); }}

**如果不加注解，使用默认数据源

至此就整合完了

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。