一、模块环境

• SpringBoot版本：2.7.12
• MySQL版本：8.0.33
• Druid版本：1.2.23
• Dynamic版本：3.6.1

二、数据源配置文件

spring:
  autoconfigure:
    # 排除 Druid 自动配置
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    #多数据源配置
    dynamic:
      primary: db1
      strict: false
      datasource:
        db1:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://IP:3306/库1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
          username: 用户
          password: 密码
        db2:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://IP:3306/库2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
          username: 用户
          password: 密码
      #数据源连接池配置
          # druid相关配置
      druid:
        # 初始化 最小 最大
        initial-size: 5
        min-idle: 5
        max-active: 20
        # 配置获取连接等待超时的时间
        max-wait: 60000
        # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
        time-between-eviction-runs-millis: 60000
        # 配置一个连接在池中最小生存的时间，单位是毫秒
        min-evictable-idle-time-millis: 300000
        validation-query: SELECT 1
        test-while-idle: true
        test-on-borrow: false
        test-on-return: false

三、数据源配置类指定连接库

package com.example.userauth.config.data;

import cn.hutool.core.util.ArrayUtil;
import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;

@Configuration
public class DataSourceConfig {

    /**
     * 返回dataSource1数据库的数据源
     */
    @Bean(name = "dataSource1")
    @Primary//主数据源
    @ConfigurationProperties(prefix = "spring.datasource.dynamic.datasource.db1")
    public DataSource dataSource1() {
        return new DruidDataSource();
    }

    /**
     * 返回dataSource1数据库的会话工厂
     */
    @Bean(name = "dataSqlSessionFactory1")
    @Primary
    public SqlSessionFactory sqlSessionFactory1(@Qualifier("dataSource1") DataSource dataSource) throws Exception {
        //MybatisPlus使用的是MybatisSqlSessionFactory 使用普通的加载不到配置文件
        MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
        //此处设置为了解决找不到mapper文件的问题
        PathMatchingResourcePatternResolver pathMatchingResourcePatternResolver = new PathMatchingResourcePatternResolver();
		//加载时不能使用getResource加载一个，两种方式加载不一样，会记载不到classpath*:mapper/model1/*.xml文件
		//同时加载两个model指定一个数据源
        sqlSessionFactoryBean.setMapperLocations(ArrayUtil.addAll( 
                //model1模块的Mapper.xml文件加载
                pathMatchingResourcePatternResolver.getResources("classpath*:mapper/model1/*.xml"),
                //model2模块的Mapper.xml文件加载
                pathMatchingResourcePatternResolver.getResources("classpath*:mapper/model2/*.xml")));
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean.getObject();
    }

    /**
     * 返回dataSource1数据库的事务
     */
    @Bean(name = "dataTransactionManager1")
    @Primary
    public PlatformTransactionManager transactionManager1(@Qualifier("dataSource1") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

	/********************分割*********************/

    /**
     * 返回dataSource2数据库的数据源
     */
    @Bean(name = "dataSource2")
    @ConfigurationProperties(prefix = "spring.datasource.dynamic.datasource.db2")
    public DataSource dataSource2() {
        return new DruidDataSource();
    }

    /**
     * 返回dataSource2数据库的会话工厂
     */
    @Bean(name = "dataSqlSessionFactory2")
    public SqlSessionFactory sqlSessionFactory2(@Qualifier("dataSource2") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                //model3模块的Mapper.xml文件加载
                .getResources("classpath*:mapper/model3/*.xml"));
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean.getObject();
    }

    /**
     * 返回dataSource2数据库的事务
     */
    @Bean(name = "dataTransactionManager2")
    public PlatformTransactionManager transactionManager2(@Qualifier("dataSource2") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

}

PS:在配置了配置文件的加载资源后，在文件下对应使用@DS()注解会失效