idea+spring框架+thymeleaf实现数据库增加数据（不使用xml文件）

news2024/12/1 0:45:48

增加数据主要涉及四个文件
Apple.java写清楚数据库内部字段

package com.example.appledemo.pojo;

import lombok.Getter;

@Getter
public class Apple {
    private Integer appleId;
    private Integer price;
    private Integer weight;

    public void setAppleId(Integer appleId) {
        this.appleId = appleId;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }

    public void setWeight(Integer weight) {
        this.weight = weight;
    }
}

AppleMapper写sql语句

package com.example.appledemo.mapper;

import com.example.appledemo.pojo.Apple;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface AppleMapper {
    @Select("SELECT * FROM apple")
    List<Apple> findAll();

    @Insert("INSERT INTO apple (appleId, price, weight) VALUES (#{appleId}, #{price}, #{weight})")
    void insertApple(Apple apple);
}

TestController指定页面

package com.example.appledemo.controller;

import com.example.appledemo.mapper.AppleMapper;
import com.example.appledemo.mapper.UserMapper;
import com.example.appledemo.pojo.Apple;
import com.example.appledemo.pojo.User;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.Model;

import java.util.ArrayList;
import java.util.List;

@Controller
public class TestController {
    @Resource
    UserMapper userMapper;
    @Resource
    AppleMapper appleMapper;

    @RequestMapping("/test")
    public ModelAndView test(){
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.setViewName("hello");
        List<String> list=new ArrayList<String>();
        list.add("yyy");
        list.add("aaa");
        list.add("bbb");
        modelAndView.addObject("list",list);
        return modelAndView;
    }

    @RequestMapping("/login")
    public String login(Model model){
        List<User> user = userMapper.findAll();
        model.addAttribute("user",user);
        return "login";
    }

    @RequestMapping("/apple")
    public String apple(Model model){
        List<Apple> apple = appleMapper.findAll();
        model.addAttribute("apple",apple);
        return "apple";
    }

    @RequestMapping("/insertPage")
    public String insertPage(){
        return "insertPage";
    }

    @RequestMapping("/insert")
    public String insert(Apple apple){
        appleMapper.insertApple(apple);
        System.out.println("新增了苹果");
        return "redirect:/apple";
    }
}

insertPage

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>添加用户</title>
    <link href="/css/bootstrap.css" rel="stylesheet">
</head>

<body>

<div style="width:800px;height:100%;margin-left:270px;">
    <form action="/insert" method="post">
        用户名：<input class="form-control" type="text" th:value="${price}" name="price"><br>
        密 码：<input class="form-control" type="text" th:value="${weight}" name="weight"><br>
        <button class="btn btn-primary btn-lg btn-block">保存</button>
    </form>
</div>

</body>
</html>

在这里插入图片描述
运行结果：