将数据库商品数据进行-增.删.改.查

一、创建项目并添加依赖

*创建项目并设置基本信息

*指定项目核心依赖

*项目结构

*项目配置文件

二、业务实现

*Pojo类定义

*Dao接口方法及映射定义package com.cy.pj.goods.dao;

import java.util.List;

import org.apache.ibatis.annotations.Delete;

import org.apache.ibatis.annotations.Insert;

import org.apache.ibatis.annotations.Mapper;

import org.apache.ibatis.annotations.Select;

import org.apache.ibatis.annotations.Update;

import com.cy.pj.goods.pojo.Goods;

@Mapper

public interface GoodsDao {

//查询

@Select("select * from tb_goods")

List findGoods();

//删除

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

int deleteById(Integer id);

//添加

@Insert("insert into tb_goods(name,remark,createdTime) value(#{name},#{remark},now())")

int insertObject(Goods entity);

//修改

@Select("select * from tb_goods where id=#{id}")

Goods findById(Integer id);

@Update("update tb_goods set name=#{name},remark=#{remark} where id=#{id} ")

int updateGoods(Goods goods);

}

*Service接口方法定义及实现package com.cy.pj.goods.service;

import java.util.List;

import com.cy.pj.goods.pojo.Goods;

public interface GoodsService {

//查询

List findGoods();

//删除

int deleteById(Integer id);

//添加

int saveGoods(Goods entity);

//修改

Goods findById(Integer id);

int updateGoods(Goods goods);

}

*定义接口实现类GoodsServiceImpl及方法实现package com.cy.pj.goods.service.impl;

import java.util.List;

importorg.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.cy.pj.goods.dao.GoodsDao;

import com.cy.pj.goods.pojo.Goods;

import com.cy.pj.goods.service.GoodsService;

@Service

public class GoodsServiceImpl implements GoodsService {

@Autowired

private GoodsDao goodsDao;

@Override //查询

public List findGoods() {

return goodsDao.findGoods();

}

@Override //删除

public int deleteById(Integer id) {

int rows = goodsDao.deleteById(id);

return rows;

}

@Override //添加

public int saveGoods(Goods entity) {

int rows = goodsDao.insertObject(entity);

return rows;

}

@Override //修改

public Goods findById(Integer id) {

return goodsDao.findById(id);

}

@Override

public int updateGoods(Goods goods) {

return goodsDao.updateGoods(goods);

}

}

*Controller对象方法定义及实现package com.cy.pj.goods.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import com.cy.pj.goods.pojo.Goods;

import com.cy.pj.goods.service.GoodsService;

@Controller

@RequestMapping("/goods/")

public class GoodsController {

@Autowired

private GoodsService goodsService;

@RequestMapping("doGoodsUI") //查詢

public String doGoodsUI(Model model) {

List list = goodsService.findGoods();

model.addAttribute("list", list);

return "goods";

}

@RequestMapping("doDeleteById/{id}") //刪除

public String doDeleteById(@PathVariable Integer id) {

goodsService.deleteById(id);

return "redirect:/goods/doGoodsUI";

}

@RequestMapping("doSaveGoods") //添加

public String doSaveGoods(Goods entity) {

goodsService.saveGoods(entity);

return "redirect:/goods/doGoodsUI";

}

@RequestMapping("doGoodsAddUI")

public String doGoodsAddUI() {

return "goods-add";

}

@RequestMapping("doUpdateGoods") //修改

public String doUpdateGoods(Goods goods) {

goodsService.updateGoods(goods);

return "redirect:/goods/doGoodsUI";

}

@RequestMapping("doFindById/{id}")

public String doFindById(@PathVariable Integer id, Model model) {

Goods goods = goodsService.findById(id);

model.addAttribute("goods", goods);

return "goods-update";

}

}

*设计Goods列表页面及实现

Insert title here

The Goods Page

添加商品

idnameremarkcreatedTimeoperation

1fbbfbbbb2020/09/01deleteupdate

*增--创建goods-add.html页面

Insert title here

ul li {list-style-type:none}

The Goods Add Page

• name:
• remark:

*改--创建goods-update.html页面

Insert title here

ul li {list-style-type:none}

The Goods Update Page

• name:
• remark:

三、易错分析404--服务器依据请求资源路径找不到对应的资源。

1)错误原因:

a,请求地址写错了

b,不一致

2)解决方式:

a,依据http://ip:port/appname/servlet-url检查请求地址。

b,检查/.xml文件。

* 500--运行时出错。

1)错误原因:

a,配置文件类名写错了。

b,程序代码写错。

2)解决方式:

a,检查/.xml文件。有没有把类名写错(必须是完整类名)

b,检查程序代码。

*