Mybatis——入门

新建

idea

准备

数据库

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');

pojo.User

package com.t0.mybatis_mysql.pojo;public class User {private Integer id;private String name;private short age;private short gender;private String phone;public User() {}public User(String phone, short gender, short age, String name, Integer id) {this.phone = phone;this.gender = gender;this.age = age;this.name = name;this.id = id;}@Overridepublic 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;}
}

配置mybatis

连接数据库

spring.application.name=mybatis_mysql
#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/db03
#db03是连接名下的数据库
#连接数据库的用户名
spring.datasource.username=www123
#连接数据库的密码
spring.datasource.password=www123

测试

package com.t0.mybatis_mysql.mapper;import com.t0.mybatis_mysql.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;@Mapper
public interface UserMapper {@Select("select * from user")public List<User> list();
}

package com.t0.mybatis_mysql;import com.t0.mybatis_mysql.mapper.UserMapper;
import com.t0.mybatis_mysql.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 MybatisMysqlApplicationTests {@Autowiredprivate UserMapper userMapper;@Testpublic void testListUser(){List<User> userList = userMapper.list();userList.stream().forEach(user -> {System.out.println(user);});}}

运行