1.配置多數據源

1. pom文件

   1. <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
      <version>2.5.6</version>
      </dependency>

2. yaml文件(一定對齊)  
   1. 第一種

       

       

      spring:  
        datasource:
          dynamic:
            primary: db1
            datasource:
              db1:
                username: root
                password: root
                url: jdbc:mysql://127.0.0.1:3306/db1
                driver-class-name: com.mysql.jdbc.Driver
                type: com.alibaba.druid.pool.DruidDataSource
              db2:
                username: root2
                password: root2
                url: jdbc:mysql://127.0.0.1:3306/db2
                driver-class-name: com.mysql.jdbc.Driver
                type: com.alibaba.druid.pool.DruidDataSource

   2. 第二種 

      spring:  
        datasource:
          dynamic:
            datasource:
              master_db1:
                username: root
                password: root
                url: jdbc:mysql://127.0.0.1:3306/db1
                driver-class-name: com.mysql.jdbc.Driver
                type: com.alibaba.druid.pool.DruidDataSource
              db2:
                username: root2
                password: root2
                url: jdbc:mysql://127.0.0.1:3306/db2
                driver-class-name: com.mysql.jdbc.Driver
                type: com.alibaba.druid.pool.DruidDataSource
              druid:
                initial-size: 20
                minIdle: 50  #最小連接池數量
                xxxxxxxxx 

2.設置默認數據源

??配置中的  primary: db1  , 即是指定默認使用的數據庫

 spring:
  datasource:
    dynamic:
      primary: db1

3.使用注解切換數據源

1. 類上

   @DS("db2")
   public class xxx(){}

2. 方法上

   @DS("db2")
   public void xxx(){}

3.  mapper方法上

   @Select("SELECT SFZH,USER_NAME,SEX FROM T_USER_INFO WHERE A = #{A}")
   @DS("db2")
   Map<String, Object> queryView(@Param("A") String A);

4.其他配置 , 啟動

修改Application注解
@SpringBootApplication(exclude = DruidDataSourceAutoConfigure.class)