springboot2.2.1整合mybatisplus+mysql8.0.18多数据源最简便方式

版本(均为目前最新版本)：

---

springboot : 2.2.1

mybatis-plus : 3.2.0

dynamic-datasource : 2.5.7

mysql : 8.0.18

druid : 1.1.21

---

废话不说，直接上代码

maven配置文件pox.xml

ps:dynamic-datasource : 2.5.7必须要spring-boot-starter-actuator的依赖，2.5.6之前的则不需要

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.2.1.RELEASE
         
    
    com.lusen
    mybatisplus
    0.0.1-SNAPSHOT
    mybatisplus
    Demo project for Spring Boot

    
        1.8
        UTF-8
        UTF-8
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.2.0
        
        
        
            com.baomidou
            dynamic-datasource-spring-boot-starter
            2.5.7
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        
        
        
            mysql
            mysql-connector-java
            8.0.18
            runtime
        
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.21
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

springboot配置文件application.yml

#端口
server:
  port: 8080

spring:
  application:
    name: mybatisplus-demo
  # DB 配置
  datasource:
    dynamic:
      #主数据源
      primary: db1
      p6spy: true
      druid:
        initial-size: 5
        min-idle: 5
        max-active: 20
        validation-query: SELECT 1 FROM DUAL
        test-while-idle: true
        #test-on-borrow: true
        validation-query-timeout: 20
        filters: stat,wall,slf4j
      datasource:
        # db1-主数据源
        db1:
          url: jdbc:mysql://123.207.xx.xx:3306/lusen?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT&allowPublicKeyRetrieval=true
          username: root
          password: xxx
          driver-class-name: com.mysql.cj.jdbc.Driver
        # db2-数据源
        db2:
          url: jdbc:mysql://123.207.xx.xx:3306/mysql?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT&allowPublicKeyRetrieval=true
          username: root
          password: xxx
          driver-class-name: com.mysql.cj.jdbc.Driver
        # db3-数据源
        db3:
          url: jdbc:mysql://123.207.xx.xx:3306/mysql?useSSL=false&characterEncoding=UTF8
          username: root
          password: xxx
          driver-class-name: com.mysql.cj.jdbc.Driver

mybatis-plus:
  global-config:
    db-config:
      id-type: auto
      capital-mode: true
  configuration:
    #打印sql
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  #mapper的xml文件路径
  mapper-locations: classpath:mybatis/mapper/**/*.xml

---

接下来新建数据库中对应的实体类

package com.lusen.mybatisplus.domain;

import com.baomidou.mybatisplus.annotation.TableName;

import java.util.Date;

/**
 * @author
 * @description
 * @data2019/11/23
 */
@TableName("t_programmer")//对应数据库表名
public class Programmer
{
    /**
     * 主键id
     */
    private Long id;

    /**
     * 程序员类型
     */
    private String type;

    /**
     * 姓名
     */
    private String name;

    /**
     * 性别
     */
    private String sex;

    /**
     * 入坑时间
     */
    private Date joinDate;

    public Long getId()
    {
        return id;
    }

    public void setId(Long id)
    {
        this.id = id;
    }

    public String getType()
    {
        return type;
    }

    public void setType(String type)
    {
        this.type = type;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public String getSex()
    {
        return sex;
    }

    public void setSex(String sex)
    {
        this.sex = sex;
    }

    public Date getJoinDate()
    {
        return joinDate;
    }

    public void setJoinDate(Date joinDate)
    {
        this.joinDate = joinDate;
    }

    @Override
    public String toString()
    {
        return "Programmer{" + "id=" + id + ", type='" + type + '\''
            + ", name='" + name + '\'' + ", sex='" + sex + '\'' + ", joinDate="
            + joinDate + '}';
    }
}

---

新建dao

package com.lusen.mybatisplus.dao;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.lusen.mybatisplus.domain.Programmer;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @author
 * @description
 * @data2019/11/23
 */
@Repository
public interface ProgrammerDao extends BaseMapper
{
    /**
     *  按名字查询(对应xml文件里的selectByName)
     * @param name
     * @return
     */
    List selectByName(@Param("name") String name);

    /**
     * 分页查询
     * @param page
     * @return
     */
    @Select("select * from t_programmer")
    IPage listProgrammer(Page page);

}

 

---

新建dao对应的programmer-mapper.xml 文件

    
      select * from t_programmer
    

 

---

新建配置类MybatisPlusConfig

package com.lusen.mybatisplus.config;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

/**
 * @author
 * @description
 * @data2019/11/23
 */
@Configuration
@MapperScan({"com.lusen.mybatisplus.dao"})
@EnableTransactionManagement
public class MybatisPlusConfig
{
    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor()
    {
        PaginationInterceptor paginationInterceptor =
            new PaginationInterceptor();
        paginationInterceptor.setLimit(100);
        return paginationInterceptor;
    }
}

---

启动类MybatisplusApplication

package com.lusen.mybatisplus;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(exclude = DruidDataSourceAutoConfigure.class)
public class MybatisplusApplication
{

    public static void main(String[] args)
    {
        SpringApplication.run(MybatisplusApplication.class, args);
    }

}

 

最后测试类ProgrammerDaoTest

package com.lusen.mybatisplus.dao;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.lusen.mybatisplus.domain.Programmer;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

@SpringBootTest
class ProgrammerDaoTest
{

    @Resource
    private ProgrammerDao programmerDao;
    
    @Test
    void selectByName()
    {
        List programmerList = programmerDao.selectByName("lusen");
        programmerList.forEach(System.out::println);
    }
    @Test
    void listProgrammer()
    {
        Page page = new Page();
        programmerDao.listProgrammer(page);
        page.getRecords().forEach(System.out::println);
    }
}

目录结构：

ok,就是这么简单，详细参考github地址