springboot整合mybatis+mysql+druid 多个数据源

springboot+mybatis+druid 多数据源

1. 创建maven项目，引入依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.5</version> <!--低版本可以解决mybatis不支持LocalDateTime问题-->
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!--druid数据源 start-->
        <!--配置druid多数据源时，要使用druid-spring-boot-starter包,否则会报错
          java: 程序包com.alibaba.druid.spring.boot.autoconfigure不存在
        -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.22</version>
        </dependency>
        <!--druid数据源 end-->

2. 配置多数据源

1. 配置数据库连接 application.yml

spring:
  datasource:
    # 数据源1
    url: jdbc:mysql://****:3306/dataSourceManagement?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai&allowMultiQueries=true
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource
    #数据源2
    icp:
      url: jdbc:mysql://****:3306/icp_rule?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai&allowMultiQueries=true
      username: root
      password: root
      type: com.alibaba.druid.pool.DruidDataSource

2. 数据源配置类（druid配置，mybatis配置），通过@MapperScan(basePackages = "com.example.datasource.mapper",sqlSessionTemplateRef = "primarySqlSessionTemplate")注解将数据源与mapper文件对应

   1. 数据源1配置类

   @Configuration
   @MapperScan(basePackages = "com.example.datasource.mapper",sqlSessionTemplateRef = "primarySqlSessionTemplate")
   public class PrimaryDataSourceConfig {
   
       /**
       * 数据源配置
       *
       * @return
       */
       @Bean
       @ConfigurationProperties(prefix = "spring.datasource")
       DataSource primaryDs() {
           // 如果使用 druid 作为连接池，则需要使用DruidDataSourceBuilder
           return DruidDataSourceBuilder.create().build();
       }
   
   
       /**
       * mybatis配置SqlSessionFactory和SqlSessionTemplate
       *
       * @return
       */
       @Bean
       SqlSessionFactory primarySqlSessionFactory() {
           SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
           sqlSessionFactoryBean.setDataSource(primaryDs());
           SqlSessionFactory sqlSessionFactory = null;
           try {
               sqlSessionFactory = sqlSessionFactoryBean.getObject();
   
           } catch (Exception e) {
               e.printStackTrace();
           }
           return sqlSessionFactory;
       }
   
       /**
       * 创建事务管理器,自定义的数据源，如果不指定事务管理器，@Transitional注解不生效
       *
       * @param
       * @return
       */
       @Bean(name = "primaryTransactionManager")
       public DataSourceTransactionManager primaryTransactionManager() {
           return new DataSourceTransactionManager(primaryDs());
       }
   
       @Bean
       SqlSessionTemplate primarySqlSessionTemplate() {
           return new SqlSessionTemplate(primarySqlSessionFactory());
       }
   }
   

   2. 数据源2配置类

   @Configuration
   @MapperScan(basePackages = "com.example.datasource.icpMapper", sqlSessionTemplateRef = "icpSqlSessionTemplate")
   public class IcpDataSourceConfig {
   
       /**
       * 数据源配置
       *
       * @return
       */
       @Bean
       @ConfigurationProperties(prefix = "spring.datasource.icp")
       DataSource icpDs() {
           // 如果使用 druid 作为连接池，则需要使用DruidDataSourceBuilder
           return DruidDataSourceBuilder.create().build();
       }
   
   
       /**
       * mybatis配置SqlSessionFactory和SqlSessionTemplate
       *
       * @return
       */
       @Bean
       SqlSessionFactory icpSqlSessionFactory() {
           SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
           sqlSessionFactoryBean.setDataSource(icpDs());
           SqlSessionFactory sqlSessionFactory = null;
           try {
               sqlSessionFactory = sqlSessionFactoryBean.getObject();
   
           } catch (Exception e) {
               e.printStackTrace();
           }
           return sqlSessionFactory;
       }
   
       /**
       * 创建事务管理器,自定义的数据源，如果不指定事务管理器，@Transitional注解不生效
       *
       * @param
       * @return
       */
       @Bean(name = "icpTransactionManager")
       public DataSourceTransactionManager icpTransactionManager(@Qualifier("icpDs") DataSource dataSource) {
           return new DataSourceTransactionManager(dataSource);
       }
   
       @Bean
       SqlSessionTemplate icpSqlSessionTemplate() {
           return new SqlSessionTemplate(icpSqlSessionFactory());
       }
   }
   

3. 完成，接下来编写mapper,数据源1的mapper写在mapper目录下，数据源2的mapper写在icpMapper目录下，再service层注入即可使用

   @Transactional(rollbackFor = Exception.class, transactionManager = "icpTransactionManager")
   @Service
   public class AServiceImpl implements AService {
       //todo 业务服务类
   }
   

参考文档：https://www.jianshu.com/p/2014d9a7b41d