mybatis框架怎么写增删改查

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><!-- 实体类 --><!-- 同名接口 --><mapper namespace="com.kkkliao.mapper.ProjectMapper">
	<!-- 实现了StudentDao 的getAll方法 -->
	<!-- id接口中的方法名 -->
	<!-- 查询全部 -->
	<select id="getAll" resultType="Project">
		select * from project	</select>
	<!-- id查询 -->
	<select id="getById" resultType="Project" parameterType="int">
		select * from project where id=#{id}	</select>
	<!-- 增加 -->
	<insert id="MyInsert" parameterType="Project">
		INSERT INTO project(`projectName`) VALUES(#{projectName});	</insert>
	<!-- 删除 -->
	<delete id="DeleteId" parameterType="Project">
		DELETE FROM project WHERE id=#{id}	</delete>
	<!-- 更改 -->
	<update id="MyUpdate" parameterType="Project">
		UPDATE project SET `projectName`=#{projectName} where id=#{id}	</update></mapper>

package com.kkkliao.mapper;

import com.kkkliao.pojo.Project;

import java.util.List;

public interface ProjectMapper {
    //1查询全部
    List<Project> getAll();
    //2Id查询
    Project getById(int id);
    //3增加
    Integer MyInsert(Project p);
    //4删
    Integer DeleteId(int id);
    //5改
    Integer MyUpdate(Project p);
}

import com.kkkliao.mapper.ProjectMapper;
import com.kkkliao.pojo.Project;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class Test {
    public static void main(String[] args) throws IOException {//抛出异常
        InputStream is= Resources.getResourceAsStream("mybatis-config.xml");
        SqlSession session=new SqlSessionFactoryBuilder().build(is).openSession(true);
        ProjectMapper pm=session.getMapper(ProjectMapper.class);
        //1查询全部
      //  List<Project> list=pm.getAll();
      //  for(int i=0; i<list.size(); i++){
      //      System.out.println(list.get(i).getProjectName());
       // }

        //2id查
      //  Project p=pm.getById(1);
      //  System.out.println(p.getProjectName());

        //3增加
       // Project p=new Project();
       // p.setProjectName("zjk");
        //int n=pm.MyInsert(p);
       // if (n!=0){
        //    System.out.println("成功");
        //}else {
       //    System.out.println("错误");
       // }

        //4删除
       // int n=pm.DeleteId(1);
       // if (n!=0){
       //     System.out.println("成功");
       // }else {
        //    System.out.println("失败");
        //}

        //5更改
        Project p=new Project();
        p.setId(2);
        p.setProjectName("sbzjk");
        int n2=pm.MyUpdate(p);
        if (n2!=0){
            System.out.println("成功");
        }else {
            System.out.println("失败");
        }


    }
}