idea搭建maven程序：04-添加子程序的代码部分

目录

一、直接写8001端口程序里，不用改的部分

二、开始书写添加的方法

2.1 先写数据库代码

2.2 再写dao

2.3 再写service和serviceImpl

2.4 最后写controller

三、在80端口中添加跳转

四、运行

---

一、直接写8001端口程序里，不用改的部分

pom.xml、application.yml、程序入口、实体entity

二、开始书写添加的方法

2.1 先写数据库代码

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.8//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.clouddemo.dao.TabUsersDao">
    <select id="findall" resultType="TabUsers">
        select * from tab_user
    </select>

    <insert id="save" parameterType="TabUsers">
        insert into tab_users values(#{id},#{loginname},#{password},#{username})
    </insert>
</mapper>

2.2 再写dao

package com.clouddemo.dao;

import com.clouddemo.entities.TabUsers;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper//与mapper里的xml建立联系
public interface TabUsersDao {
    public List<TabUsers> findall();
    public boolean save(TabUsers u);
}

2.3 再写service和serviceImpl

package com.clouddemo.service;

import com.clouddemo.entities.TabUsers;

import java.util.List;

public interface TabUsersService {
    public List<TabUsers> findall();
    public boolean save(TabUsers u);
}

package com.clouddemo.service.Impl;

import