MyBatis-快速入门

MyBatis是一款优秀的持久层框架，用于简化JDBC的开发

MyBatis是Apache的一个开源项目iBatis，2010年这个项目由apache迁移到了Google code，并且改名为MyBatis,2013年11月迁移到Github

使用MyBatis查询所有用户信息：

1.准备工作（创建springboot工程、数据库表User、实体类User）

 

 User类

package com.bignyi.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 gender, String phone) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = gender;
        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 getGender() {
        return gender;
    }

    public void setGender(Short gender) {
        this.gender = gender;
    }

    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 +
                ", gender=" + gender +
                ", phone='" + phone + '\'' +
                '}';
    }
}

2.引入MyBatis的相关依赖，配置MyBatis（数据库连接信息）

#?????
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#??????url
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis
#?????????
spring.datasource.username=root
#????????
spring.datasource.password=1234

3.编写SQL语句（注解/XML）

package com.bignyi.mapper;

import com.bignyi.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 list();
}

package com.bignyi;

import com.bignyi.mapper.UserMapper;
import com.bignyi.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 SpringbootMybatisQuickstartApplicationTests {
    @Autowired
    private UserMapper userMapper;

    @Test
    public void testListUser() {
        List userList = userMapper.list();
        userList.stream().forEach(user -> System.out.println(user));

    }

}

package com.bignyi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootMybatisQuickstartApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMybatisQuickstartApplication.class, args);
    }

}

运行结果：