springboot集成mybatis源码分析（一）

本篇文章只是简单接受使用，具体源码解析请看后续文章

1、新建springboot项目，并导入mybatis的pom配置

配置数据库驱动和mybatis dependency

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

application.yml配置

spring :
  datasource :
      driverClassName : com.mysql.jdbc.Driver
      url : jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
      username : root
      password : 123456

2、基础类（使用lombok自动生成get/set方法）

package com.example.demo.domain;

import lombok.Data;

@Data
public class User {
    private Integer id;
    private String username;
    private Integer age;
}

3、测试dao（mybatis使用注解开发）

package com.example.demo.dao;

import com.example.demo.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserDao {
    
    @Select("SELECT * FROM USER")
    List<User> getUser();
}

4、测试service

package com.example.demo.service;

import com.example.demo.dao.UserDao;
import com.example.demo.domain.User;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@Slf4j
public class UserService {

    @Autowired
    private UserDao userDao;

    public List<User> getUser(){
        List<User> userList = userDao.getUser();
        log.info("查询出来的用户信息，{}",userList.toString());
        return userList;
    }
}

5、service对应的test类（该测试类继承主测试类（主测试类直接在启动文件上goto test即可自动生成））

package com.example.demo.service;

import com.example.demo.DemoApplicationTests;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import static org.junit.Assert.*;

public class UserServiceTest extends DemoApplicationTests {

    @Autowired
    private UserService userService;

    @Test
    public void getUser() {
        userService.getUser();
    }

}

package com.example.demo;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

    @Test
    public void contextLoads() {
    }

}

6、运行测试类输出结果

　　查询出来的用户信息，[User(id=1, username=test, age=11)]