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;}
@Overridepublic 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 {
@Autowiredprivate UsreMapper usreMapper;
@Testpublic void testListUser(){List<User> list = usreMapper.list();for (User user : list) {System.out.println(user);}}

}