MyBatis的创建和测试

创建项目点击Spring Initializr然后点击next

点击SQL 选择里面的Mybatis Framework和Mysql Driver

按如下图片创建项目

user表中的数据

#下面这些内容是为了让MyBatis映射
#指定Mybatis的Mapper文件
mybatis.mapper-locations=classpath:mappers/*xml
#指定Mybatis的实体目录
mybatis.type-aliases-package=com.ming.mybatis.entity

#驱动名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#数据库的url
spring.datasource.url=jdbc:mysql://localhost:3306/db02

#数据库的用户名
spring.datasource.username=root

#数据库的密码
spring.datasource.password=123456

创建user类

package com.ming.pojo;

public class User {
    private Integer id;
    private String name;
    private short age;
    private  short gender;
    private String phone;

    public User() {
    }

    public User(Integer id, String name, short age, short genden, String phone) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = genden;
        this.phone = phone;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public short getAge() {
        return age;
    }

    public void setAge(short age) {
        this.age = age;
    }

    public short getGenden() {
        return gender;
    }

    public void setGenden(short genden) {
        this.gender = genden;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", genden=" + gender +
                ", phone='" + phone + '\'' +
                '}';
    }
}

创建UsreMapper接口

package com.ming.mapper;

import com.ming.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper//运行时，会自动生成该类接口的实现类对象，并且将该接口交给IOC容器
public interface UsreMapper {
    @Select("select * from user")
    public List<User> list();
}

在测试类写如下代码

package com.ming;

import com.ming.mapper.UsreMapper;
import com.ming.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class Springbootmybatis01ApplicationTests {

    @Autowired
    private UsreMapper usreMapper;

    @Test
    public void testListUser(){
        List<User> list = usreMapper.list();
        for (User user : list) {
            System.out.println(user);
        }
    }

}