Java框架：Spring Boot ：配置多數據源

• 1.數據源掃描的mapper路徑要對應：分包配置，兩種包格式

• 2.數據源讀取對應的配置名稱要對應

• 3.主配置數據源和主事務一定加 @Priamry 

目錄結構：分包配置

                                     

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步驟：

• 1.創建兩個/多個數據庫
• 2.resources/application.properties 配置多個數據源配置

• #數據源配置
  #數據源1  主數據源
  spring.datasource.sbtest1.driverClassName=com.mysql.jdbc.Driver
  spring.datasource.sbtest1.url=jdbc:mysql://localhost:3306/sbtest1?useUnicode=true&characterEncoding=utf-8
  spring.datasource.sbtest1.username=root
  spring.datasource.sbtest1.password=root
  
  #數據源2
  spring.datasource.sbtest2.driverClassName=com.mysql.jdbc.Driver
  spring.datasource.sbtest2.url=jdbc:mysql://localhost:3306/sbtest2?useUnicode=true&characterEncoding=utf-8
  spring.datasource.sbtest2.username=root
  spring.datasource.sbtest2.password=root

• 3.主數據源 datasource/DataSource01.class

  //註解到springboot容器中
  @Configuration
  
  //對應目錄結構1
  @MapperScan(basePackages = "com.zjc.sbtest1.mapper", sqlSessionFactoryRef = "sbtest1SqlSessionFactory")
  
  //對應目錄結構2
  //@MapperScan(basePackages = "com.zjc.mapper.sbtest1", sqlSessionFactoryRef = "sbtest1SqlSessionFactory")
  public class DataSource01 {
  
      //獲取sbtest1數據庫的數據源
      @Bean(name = "sbtest1DataSource")
      @Primary  //主數據源
  	//prefix前綴名和application.properties中對應的數據源一樣
      @ConfigurationProperties(prefix = "spring.datasource.sbtest1")
      public DataSource dateSource() {
          return DataSourceBuilder.create().build();
      }
  
      //返回sbtest1數據庫的會話工廠
      @Bean(name = "sbtest1SqlSessionFactory")
      public SqlSessionFactory sqlSessionFactory(@Qualifier("sbtest1DataSource") DataSource ds) throws Exception {
          SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
          bean.setDataSource(ds);
          return bean.getObject();
      }
  
      //返回sbtest1數據庫的事務
      @Bean(name = "sbtest1TransactionManager")
      @Primary  //主事務
      public DataSourceTransactionManager transactionManager(@Qualifier("sbtest1DataSource") DataSource dataSource) {
          return new DataSourceTransactionManager(dataSource);
      }
  
      //返回sbtest1數據庫的會話模版
      @Bean(name = "sbtest1SqlSessionTemplate")
      public SqlSessionTemplate sqlSessionTemplate(
              @Qualifier("sbtest1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
          return new SqlSessionTemplate(sqlSessionFactory);
      }
  }

• 3.配置其他數據源DataSource02.class

•  一個應用只能有一個主數據源和主事務，可以有多個非主數據源和事務。只在主數據源中寫兩個@priamary，其它數據源和事務不能寫

• //註解到springboot容器中
  @Configuration
  
  //對應目錄結構1
  
  @MapperScan(basePackages = "com.zjc.sbtest2.mapper", sqlSessionFactoryRef = "sbtest2SqlSessionFactory")
  //對應目錄結構2
  //@MapperScan(basePackages = "com.zjc.mapper.sbtest2", sqlSessionFactoryRef = "sbtest2SqlSessionFactory")
  public class DataSource02 {
  
      //返回sbtest2數據庫的數據源
      @Bean(name = "sbtest2DataSource")
      @ConfigurationProperties(prefix = "spring.datasource.sbtest2")
      public DataSource dateSource() {
          return DataSourceBuilder.create().build();
      }
  
      //返回sbtest2數據庫的會話工廠
      @Bean(name = "sbtest2SqlSessionFactory")
      public SqlSessionFactory sqlSessionFactory(@Qualifier("sbtest2DataSource") DataSource ds) throws Exception {
          SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
          bean.setDataSource(ds);
          return bean.getObject();
      }
  
      //返回sbtest2數據庫的事務
      @Bean(name = "sbtest2TransactionManager")
      public DataSourceTransactionManager transactionManager(@Qualifier("sbtest2DataSource") DataSource dataSource) {
          return new DataSourceTransactionManager(dataSource);
      }
  
      //返回sbtest2數據庫的會話模版
      @Bean(name = "sbtest2SqlSessionTemplate")
      public SqlSessionTemplate sqlSessionTemplate(
              @Qualifier("sbtest2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
          return new SqlSessionTemplate(sqlSessionFactory);
      }
  }

• 4.App.class

• //根據目錄結構選擇掃描路徑
  @EnableAutoConfiguration
  //@MapperScan(basePackages = "com.zjc.mapper")
  @ComponentScan(basePackages = {"com.zjc.web", "com.zjc.sbtest1","com.zjc.sbtest2","com.zjc.datasource"})
  //@ComponentScan(basePackages = {"com.zjc.web", "com.zjc.service","com.zjc.datasource"})
  public class App {
      public static void main(String[] args) {
          SpringApplication.run(App.class, args);
      }
  }