1.在idea中配置好数据源

2、视频案例中只给出了查询所有结果的示例，请自己完成添加、删除、修改操作的代码。以下供参

考。

 @Delete("delete from emp where id=#{id}")

     public void delete(Integer id);

测试代码

 @Test

     public void testDelete(){

         empMapper.delete(17);

     }

@Insert("insert into emp(username, name, gender, image, job, entrydate, dept_id, create_time, update_time)" +

            "values (#{username},#{name},#{gender},#{image},#{job},#{entrydate},#{deptId},#{createTime},#{updateTime})")

public void insert(Emp emp);

测试代码

@Test

    public void testInsert(){

        Emp emp=new Emp();

        emp.setUsername("Tom");

        emp.setName("汤姆");

        emp.setImage("1.jpg");

        emp.setGender((short)1);

        emp.setJob((short)1);

        emp.setEntrydate(LocalDate.of(2000,1,1));

        emp.setCreateTime(LocalDateTime.now());

        emp.setUpdateTime(LocalDateTime.now());

        emp.setDeptId(1);

empMapper.insert(emp);

     }

@Update("update emp set username=#{username},name=#{name},gender=#{gender}," +

        "image=#{image},job=#{job},entrydate=#{entrydate},dept_id=#{deptId},update_time=#{updateTime} where id=#{id}")

public void update(Emp emp);

测试代码

 @Test

    public void testUpdate(){

        Emp emp=new Emp();

        emp.setId(17);

        emp.setUsername("Tom1");

        emp.setName("汤姆1");

        emp.setImage("1.jpg");

        emp.setGender((short)1);

        emp.setJob((short)1);

        emp.setEntrydate(LocalDate.of(2000,1,1));

        emp.setUpdateTime(LocalDateTime.now());

        emp.setDeptId(1);

        empMapper.update(emp);

    }

@Select("select * from emp where name like '%${name}%' and gender =#{gender} and " +

            "entrydate between #{begin} and #{end} order by update_time desc")

    public List<Emp> list(String name, Short gender, LocalDate begin,LocalDate end);

测试代码

 @Test

    public void testList(){

        empMapper.list("张",(short)1,LocalDate.of(2010,1,1),LocalDate.of(2020,1,1));

        System.out.println(empList);

    }

3、lombok库的使用。尝试将实体类采用注解的方式来实现。

import lombok.*;

//@Getter

//@Setter

//@ToString

//@EqualsAndHashCode

@Data

@NoArgsConstructor

@AllArgsConstructor

public class User {

    private Integer id;

    private String name;

    private Short age;

    private Short gender;

    private String phone;

4、学习idea的调试技巧，并尝试使用。

5、对以下案例使用mybatis进行添加、删除、修改、更新的操作。

@Mapper

public interface PoetMapper {

    @Delete("delete from poet where id=#{id}")

    public void delete(Integer id);

    @Insert("insert into poet(name,gender,dynasty,title,style)" +

            "values (#{name},#{gender},#{dynasty},#{title},#{style})")

    public void insert(Poet poet);

    @Update("update poet set name=#{name},gender=#{gender}," +

            "dynasty=#{dynasty},title=#{title},style=#{style} where id=#{id}")

    public void update(Poet poet);

}

测试代码

@SpringBootTest

class SpringbootMybatisCrudApplicationTests {

     @Autowired

     private PoetMapper poetMapper;

    @Test

    public void testInsert(){

        Poet poet=new Poet();

        poet.setName("汤姆");

        poet.setGender((short)1);

        poet.setDynasty("元代");

        poet.setTitle("诗词爱好者");

        poet.setStyle("无");

        poetMapper.insert(poet);

     }

    @Test

     public void testDelete(){

         poetMapper.delete(7);

     }

    @Test

    public void testUpdate(){

        Poet poet=new Poet();

        poet.setId(18);

        poet.setName("汤姆1");

        poet.setGender((short)1);

        poet.setDynasty("清代");

        poet.setTitle("无");

        poet.setStyle("无");

        poetMapper.update(poet);

    }