详细版本

引入依赖

        <!-- druid -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.18</version>
		</dependency>

		<!--主从配置依赖 -->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
			<version>2.4.2</version>
		</dependency>

添加druid配置和多数据源配置

# 默认数据源
spring.datasource.dynamic.primary=master

#生产======================================================================================================
##主库配置 master  本地MYSQL
spring.datasource.dynamic.datasource.master.username=root
spring.datasource.dynamic.datasource.master.password=admin
spring.datasource.dynamic.datasource.master.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.dynamic.datasource.master.url=
#从库配置 chengyun
spring.datasource.dynamic.datasource.chengyun.username=root
spring.datasource.dynamic.datasource.chengyun.password=root@123456
spring.datasource.dynamic.datasource.chengyun.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.dynamic.datasource.chengyun.url=

## druid连接池配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
##主库配置 master  
spring.datasource.dynamic.datasource.master.druid.initial-size=5
spring.datasource.dynamic.datasource.master.druid.max-active=20
spring.datasource.dynamic.datasource.master.druid.min-idle=5
spring.datasource.dynamic.datasource.master.druid.max-wait=60000
spring.datasource.dynamic.datasource.master.druid.min-evictable-idle-time-millis=300000
spring.datasource.dynamic.datasource.master.druid.max-evictable-idle-time-millis=300000
spring.datasource.dynamic.datasource.master.druid.time-between-eviction-runs-millis=60000
spring.datasource.dynamic.datasource.master.druid.validation-query=select 1 
spring.datasource.dynamic.datasource.master.druid.validation-query-timeout=-1
spring.datasource.dynamic.datasource.master.druid.test-on-borrow=false
spring.datasource.dynamic.datasource.master.druid.test-on-return=false
spring.datasource.dynamic.datasource.master.druid.test-while-idle=true
spring.datasource.dynamic.datasource.master.druid.pool-prepared-statements=true
spring.datasource.dynamic.datasource.master.druid.filters=stat,wall,log4j
spring.datasource.dynamic.datasource.master.druid.share-prepared-statements=true
# chengyun库配置 
spring.datasource.dynamic.datasource.chengyun.druid.initial-size=5
spring.datasource.dynamic.datasource.chengyun.druid.max-active=20
spring.datasource.dynamic.datasource.chengyun.druid.min-idle=5
spring.datasource.dynamic.datasource.chengyun.druid.max-wait=60000
spring.datasource.dynamic.datasource.chengyun.druid.min-evictable-idle-time-millis=300000
spring.datasource.dynamic.datasource.chengyun.druid.max-evictable-idle-time-millis=300000
spring.datasource.dynamic.datasource.chengyun.druid.time-between-eviction-runs-millis=60000
spring.datasource.dynamic.datasource.chengyun.druid.validation-query=select 1
spring.datasource.dynamic.datasource.chengyun.druid.validation-query-timeout=-1
spring.datasource.dynamic.datasource.chengyun.druid.test-on-borrow=false
spring.datasource.dynamic.datasource.chengyun.druid.test-on-return=false
spring.datasource.dynamic.datasource.chengyun.druid.test-while-idle=true
spring.datasource.dynamic.datasource.chengyun.druid.pool-prepared-statements=true
spring.datasource.dynamic.datasource.chengyun.druid.filters=stat,wall,log4j
spring.datasource.dynamic.datasource.chengyun.druid.share-prepared-statements=true

使用@DS注解表名某些Service用哪个数据源，不标注使用默认数据源