入門程序大概步驟敘述：

步驟一：創建springboot工程并且數據庫提前創建表

步驟二：創建springboot工程對Mybatis相關依賴注意打勾

步驟三：編寫查找方法

步驟四：編寫測試方法

項目目錄結構與數據庫以及代碼：

項目目錄結構

數據庫db02與表user

User（實體類代碼）

package com.itheima.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;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", age=" + age +", gender=" + gender +", phone='" + phone + '\'' +'}';}
}

UserMapper（接口代碼）

package com.itheima.mapper;import com.itheima.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;@Mapper//在運行時,會自動生成該接口的實現類對象(代理對象)，并且將該對象交給IOC容器管理
public interface UserMapper {@Select("select * from user")public List<User> list();
}

application.properties（數據庫配置代碼）

#驅動類名稱
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#數據庫連接的url
spring.datasource.url=jdbc:mysql://localhost:3306/db02
#連接數據庫的用戶名
spring.datasource.username=root
#連接數據庫的密碼
spring.datasource.password=root

SpringbootMybatisQuickstartApplicationTests（測試類代碼）

package com.itheima;import com.itheima.mapper.UserMapper;
import com.itheima.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//springboot整合單元測試的注解
class SpringbootMybatisQuickstartApplicationTests {@Autowiredprivate UserMapper userMapper;@Testpublic void testListUser(){List<User> userList = userMapper.list();userList.stream().forEach(user -> {System.out.println(user);});}
}

結果