简单mvc+三层架构实现增删改查功能

简单mvc+三层架构–>实现增删改查功能@数据库设计副产物

我的数据库系统做的是简单的外卖订餐平台~~~
耗时两天，快速实现的增删改查功能，话不多说，先上图，再贴代码

还有删除功能和修改功能截图就不好展示啦，详情b站欢迎您！！！

代码实现，太多了贴不完呀，这里只放删除的主要程序吧！修改也行O(∩_∩)O

数据库的连接

这里我使用阿里的druid连接池，后台查询等语句使用JdbcTemplate的queryForObject
写好工具包连接ConUtil，dao层实现类如下：
提示：代码中中包含复杂条件查询的处理哟，findbycondition!

package com.lcx.dao;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import com.lcx.entity.Manager;
import com.lcx.entity.Menu;
import com.lcx.entity.Restaurant;
import com.lcx.utils.ConUtils;

/**
 * @author 作者 E-mail:
 * @version 创建时间：2019年12月14日 上午9:58:50 类说明
 */
public class ManagerDaoImpl implements ManagerDao {

	// 创建jdbcTemplate对象
	private JdbcTemplate template = new JdbcTemplate(ConUtils.getDataSource());

	@Override
	public List findAll() {
		String sql = "select * from restaurant";
		List restaurants = template.query(sql, new BeanPropertyRowMapper(Restaurant.class));
		return restaurants;
	}

	@Override
	public void add(Restaurant restaurant) {
		String sql = "insert into restaurant values(?,?,?,?,?,?,?,?,?,null)";
		template.update(sql, restaurant.getRest_adds(), restaurant.getRest_manager(), restaurant.getRest_tel(),
				restaurant.getFee(), restaurant.getDiscount(), restaurant.getRest_name(), restaurant.getDishid(),
				restaurant.getComments(), restaurant.getRest_range());

	}

	@Override
	public List findManager() {
		String sql = "select * from manager";
		List managers = template.query(sql, new BeanPropertyRowMapper(Manager.class));
		return managers;
	}

	@Override
	public Manager logincheck(String manager_count, String manager_psw) {
		try {
			System.out.println("执行登陆验证方法了！！!");
			String sql = "select * from manager where manager_count = ? and manager_psw = ?";
			Manager manager = template.queryForObject(sql, new BeanPropertyRowMapper(Manager.class),
					manager_count, manager_psw);
			if (manager == null) {
				System.out.println("没找到manager对象");
			}
			return manager;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public void del(int id) {
		String sql = "delete from restaurant where restid = ?";
		template.update(sql, id);

	}

	@Override
	public void updateRest(Restaurant restaurant) {
		String sql = "update restaurant set rest_adds = ? , rest_manager = ? , rest_tel = ? , fee = ? , discount = ? , rest_name = ? , dishid = ? , comments = ? , rest_range = ? where restid = ?";
		template.update(sql, restaurant.getRest_adds(), restaurant.getRest_manager(), restaurant.getRest_tel(),
				restaurant.getFee(), restaurant.getDiscount(), restaurant.getRest_name(), restaurant.getDishid(),
				restaurant.getComments(), restaurant.getRest_range(), restaurant.getRestid());

	}

	@Override
	public Restaurant findById(String id) {
		String sql = "select * from restaurant where restid = ?";
		return template.queryForObject(sql, new BeanPropertyRowMapper(Restaurant.class), id);

	}

	@Override
	public List findbycondition(Map condition) {
		String sql = "select * from restaurant  where 1 = 1 ";

        StringBuilder sb = new StringBuilder(sql);
        //2.遍历map
        Set keySet = condition.keySet();
        //定义参数的集合
        List