Springboot 整合Mybatis 使用Mybatis-plus 敏捷开发-CFANZ编程社区

简单说下，MyBatis-plus为我们提供了默认的增删改查和一些基础使用的条件查询等。

直接进入代码环节，

pom.xml 的核心依赖包：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- druid数据源驱动 1.1.10解决springboot从1.0——2.0版本问题-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

application.yml：

spring:
  datasource:
    druid:
      username: root
      password: root
      url: jdbc:mysql://localhost:3306/mylocal?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8&zeroDateTimeBehavior=convertToNull
      #      driver-class-name: com.mysql.jdbc.Driver
      initialSize: 5
      minIdle: 5
      maxActive: 20
      maxWait: 60000
      timeBetweenEvictionRunsMillis: 60000
      minEvictableIdleTimeMillis: 300000
      validationQuery: SELECT 1 FROM DUAL
      testWhileIdle: true
      testOnBorrow: false
      testOnReturn: false
      poolPreparedStatements: true
      maxPoolPreparedStatementPerConnectionSize: 20
      useGlobalDataSourceStat: true
      connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

#配置端口
server:
  port: 8037

接着直接到了使用mybatis-plus （其实跟普通的mybatis使用没什么区别，只是少写一些方法。）

POJO

MyInfo.java：

PS：这里的主键设置自增需要注意

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;

/**
 * @Author : JCccc
 * @CreateTime : 2019/12/4
 * @Description :
 **/
@Data
public class MyInfo {
    @TableId(value = "id",type = IdType.AUTO)
    private Integer id;
    private Integer num;
    private String name;
    private  Integer age;
}

Mapper

MyInfoMapper.java：

PS：可以看到我只是额外写了一个根据条件查询（模拟实际的业务查询），增删查改都没写，因为BaseMapper都为我们提供了这些。

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.demo.elegant.pojo.MyInfo;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

/**
 * @Author : JCccc
 * @CreateTime : 2019/12/4
 * @Description :
 **/
@Mapper
public interface MyInfoMapper extends BaseMapper<MyInfo> {

    @Select("SELECT * FROM my_info where id=#{id} and name=#{name}")
    MyInfo getMyInfoConditional(@Param("id") Integer id,@Param("name") String name);
}

BaseMapper 默认提供的方法：

Springboot 整合Mybatis 使用Mybatis-plus 敏捷开发_springboot

这里为了演示简单的使用，我就不写service和serviceImpl了。

直接开始接口测试：

MyInfoController.java：

import com.demo.elegant.mapper.MyInfoMapper;
import com.demo.elegant.pojo.MyInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

/**
 * @Author : JCccc
 * @CreateTime : 2019/12/4
 * @Description :
 **/
@RestController
public class MyInfoController {
    @Autowired
    MyInfoMapper myInfoMapper;

    @GetMapping("/testPlus")
    public void testPlus() {
        MyInfo myInfo1 = new MyInfo();

        myInfo1.setNum(1011909);
        myInfo1.setName("one");
        myInfo1.setAge(11);
        int effectNum1 = myInfoMapper.insert(myInfo1);
        System.out.println("添加后的影响行数："+effectNum1+"--- 1主键："+myInfo1.getId());
        MyInfo myInfo2=new MyInfo();

        myInfo2.setNum(1011220);
        myInfo2.setName("two");
        myInfo2.setAge(30);
        int effectNum2 = myInfoMapper.insert(myInfo2);
        System.out.println("添加后的影响行数："+effectNum2+"--- 2主键："+myInfo2.getId());

        List<MyInfo> myInfoList = myInfoMapper.selectList(null);
        System.out.println("查询出来的list："+myInfoList.toString());

       // int effectNumeDelete = myInfoMapper.deleteById(2);

       // System.out.println("删除后影响行数："+effectNumeDelete);

        MyInfo myInfoConditional = myInfoMapper.getMyInfoConditional(2, "two");

        System.out.println("根据条件查询出来的数据："+myInfoConditional.toString());


    }
}