创建数据表:
create table user(
id int unsigned primary key auto_increment comment 'ID',
name varchar(100) comment '姓名',
age tinyint unsigned comment '年龄',
gender tinyint unsigned comment '性别, 1:男, 2:女',
phone varchar(11) comment '手机号'
) comment '用户表';
insert into user(id, name, age, gender, phone) VALUES (null,'白眉鹰王',55,'1','18800000000');
insert into user(id, name, age, gender, phone) VALUES (null,'金毛狮王',45,'1','18800000001');
insert into user(id, name, age, gender, phone) VALUES (null,'青翼蝠王',38,'1','18800000002');
insert into user(id, name, age, gender, phone) VALUES (null,'紫衫龙王',42,'2','18800000003');
insert into user(id, name, age, gender, phone) VALUES (null,'光明左使',37,'1','18800000004');
insert into user(id, name, age, gender, phone) VALUES (null,'光明右使',48,'1','18800000005');
创建实体类:
/* * Copyright (c) 2020, 2023, All rights reserved. * */ package com.example.springbootmybatis.pojo; /** *
Project: spring-boot-mybatis - User
*Powered by scl On 2023-10-07 10:12:33
*描述:
* * @author 孙臣龙 [1846080280@qq.com] * @version 1.0 * @since 17 */ public class User { private Integer id; private String name; private short age; private short gender; private String phone; @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", age=" + age + ", gender=" + gender + ", 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 getGender() { return gender; } public void setGender(short gender) { this.gender = gender; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public User(Integer id, String name, short age, short gender, String phone) { this.id = id; this.name = name; this.age = age; this.gender = gender; this.phone = phone; } public User() { } }
配置文件:
#驱动类名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#数据库连接的url
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis
#连接数据库的用户名
spring.datasource.username=root
#连接数据库的密码
spring.datasource.password=
package com.example.springbootmybatis.mapper; import com.example.springbootmybatis.pojo.User; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Select; import java.util.List; /** *
Project: spring-boot-mybatis - UserMapper
*Powered by scl On 2023-10-07 10:17:12
*描述:
* * @author 孙臣龙 [1846080280@qq.com] * @version 1.0 * @since 17 */ @Mapper //在运行时会自动生成实现类对像,并交给ioc容器管理 public interface UserMapper { @Select("select * from user") public List
list(); }
编写测试类:
package com.example.springbootmybatis;
import com.example.springbootmybatis.mapper.UserMapper;
import com.example.springbootmybatis.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 SpringBootMybatisApplicationTests {
@Autowired
private UserMapper userMapper;
@Test
public void testListUser(){
List userList=userMapper.list();
userList.stream().forEach(user -> {
System.out.println(user);
});
}
}