pom.xml

<properties>
	<dynamic-datasource.version>3.2.1</dynamic-datasource.version>
    <mybatis-plus.version>3.4.2</mybatis-plus.version>
    <druid.version>1.2.4</druid.version>
</properties>

<dependencies>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>${druid.version}</version>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
	<dependency>
		<groupId>com.baomidou</groupId>
		<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
		<version>${dynamic-datasource.version}</version>
	</dependency>
</dependencies>

application.yml

spring:
  #多数据源配置
  datasource:
    druid:
      stat-view-servlet:
        enabled: true
        loginUsername: 954L
        loginPassword: 123456
      destroy-scheduler: close
      filter:
        stat:
          log-slow-sql: true  # 开启慢查询记录
          slow-sql-millis: 5000 # 慢 SQL 的标准，单位：毫秒
          merge-sql: true # SQL合并配置
    dynamic:
      primary: read # 默认的数据源；命名规则：组名_xxx；指定组名根据特定算法返回任意一个数据源
      datasource:
        read_1:
          url: ${site.mysql.data-url}
          username: ${site.mysql.username}
          password: ${site.mysql.password}
        read_2:
          url: ${site.mysql.data-url}
          username: ${site.mysql.username}
          password: ${site.mysql.password}
        write:
          url: ${site.mysql.data-url}
          username: ${site.mysql.username}
          password: ${site.mysql.password}

Application.java

# 移除Druid自动装配数据源
@SpringBootApplication(exclude = {DruidDataSourceAutoConfigure.class})
public class SiteApplication extends SpringBootServletInitializer

如何切换数据源

@DS("write")
@Transactional(rollbackFor = Exception.class)
public Object saveByDto(PolicyAddDto policyAddDto, SystemUser systemUser)

@DS(“数据源名”)：在Service层添加注解即可切换数据源，不加注解默认采用上文填写的read

踩坑记录
springboot druid连接池多数据源SQL错误sql injection violation, multi-statement not