springboot整合mybatis (+整合junit)

整合mybatis

首先，展示整合后的目录:

添加Mybatis的起步依赖

<!--mybatis起步依赖-->
<dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.0</version>
</dependency>

添加数据库驱动坐标

<!--mysql连接驱动-->
<dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
</dependency>

添加数据库连接信息

在application.properties中添加数据量的连接信息

#数据库配置信息
spring.datasource.driverClassCame=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456

注意：因为使用了Mysql Connector/J 6.x以上的版本，然后就会报时区的错误，所以url中要加入 serverTimezone=UTC。

在test数据库中创建user表

DROP TABLE IF EXISTS `user`; 
CREATE TABLE `user` (  
`id` int(11) NOT NULL AUTO_INCREMENT,  
`username` varchar(50) DEFAULT NULL,  
`password` varchar(50) DEFAULT NULL,  
`name` varchar(50) DEFAULT NULL,  
PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
 
-- ----------------------------- Records of user -- ---------------------------
INSERT INTO `user` VALUES ('1', 'zhangsan', '123', '张三'); 
INSERT INTO `user` VALUES ('2', 'lisi', '123', '李四');

创建实体Bean

public class User {

    private Integer id;
    private String username;
    private String password;
    private String name;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                '}';
    }
}

View Code

编写Mapper

@Mapper
public interface UserMapper {

    public List<User> queryUserList();
}

注意：@Mapper标记该类是一个mybatis的mapper接口，可以被spring boot自动扫描到spring上下文中

配置Mapper映射文件

在src\main\resources\mapper路径下加入UserMapper.xml配置文件"

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<mapper namespace="com.itheima.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
        select * from user
    </select>
</mapper>

在application.properties中添加mybatis的信息

#spring集成Mybatis环境 
#pojo别名扫描包
mybatis.type-aliases-package=com.itheima.domain 
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

编写测试Controller

@Controller
public class MybatisController {

    @Autowired
    private UserMapper userMapper;

    @RequestMapping("/mybatis")
    @ResponseBody
    public List<User> queryUserList(){
        List<User> users = userMapper.queryUserList();
        return users;
    }
}

测试

整合junit

添加Junit的起步依赖

<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
       <scope>test</scope>
</dependency>

 编写测试类

import com.itheima.domain.User;
import com.itheima.mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)//使用springrunner类执行
@SpringBootTest(classes = SpringbootMybatisApplication.class)
public class MybatisTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void test(){
        List<User> users = userMapper.queryUserList();
        System.out.println(users);
    }
}

其中，SpringRunner继承自SpringJUnit4ClassRunner，使用哪一个Spring提供的测试引擎都可以

public final class SpringRunner extends SpringJUnit4ClassRunner 

@SpringBootTest的属性指定的是引导类的字节码对象

控制台打印结果：