数据库代码：

create database xiaojungan;use xiaojungan;create table IF NOT EXISTS `t_user` (  `id` int NOT NULL AUTO_INCREMENT,  `username` varchar(50) NOT NULL ,  `password` varchar(50) NULL ,  `role` int(11) NOT NULL DEFAULT '0' COMMENT '用户角色',  PRIMARY KEY (`id`)) AUTO_INCREMENT=100;CREATE TABLE `t_food` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `foodname` varchar(100) NOT NULL,  `type_id` int(11) ,  `descript` longtext ,  `price` decimal(10,2) ,  `onSale` int(11) default '0',  `imgAddress` varchar(200) ,  PRIMARY KEY (`id`)) ;CREATE TABLE `t_type` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `typename` varchar(20) ,  PRIMARY KEY (`id`)) ;CREATE TABLE `t_order` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `food_id` int(11),  `user_id` int(11),  `table_id` int(11),  `food_account` int(11) ,  PRIMARY KEY (`id`));CREATE TABLE `t_table` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `tablename` varchar(20) ,  `user_id` int(11),  PRIMARY KEY (`id`))

 

c3p0-config.xml

     
         
              
       
        com.mysql.cj.jdbc.Driver
               
       
        jdbc:mysql://localhost:3306/xiaojungan?serverTimezone=Asia/Shanghai
               
       
        root
               
       
        147258369
               
               
       
        10
               
               
       
        1
               
               
       
        100
               
               
       
        10
           
      
     

 

Java

 

FoodDaoimpl.java

package dao.daoImpl;import bean.Food;import util.C3P0Util;import dao.FoodDao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.util.ArrayList;import java.util.List;public class FoodDaoImpl implements FoodDao{    @Override    public void addFood(Food food) throws Exception{        String sql = "INSERT INTO `xiaojungan`.`t_food`(`foodname`,`type_id`,`descript`,`price`,`saling`,`img`) VALUES (?,?,?,?,?,?)";        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql);        ) {            ps.setString(1,food.getFoodname());            ps.setInt(2, food.getType_id());            ps.setString(3,food.getDescript());            ps.setBigDecimal(4, food.getPrice());            ps.setInt(5,food.getSaling());            ps.setString(6, food.getImg());            ps.executeUpdate();        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException("添加失败！");        }    }    @Override    public List
     
       findSalingFoods() throws Exception{        String sql = "select * from t_food where saling=?";        List
      
        foodList = new ArrayList<>();        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql)        ) {            ps.setInt(1, 1);            try (                    ResultSet rs = ps.executeQuery()            ) {                //将查询出的结果数据封装到List对象中                while(rs.next()){                    Food b = new Food();                    b.setId(rs.getInt("id"));                    b.setFoodname(rs.getString("foodname"));                    b.setType_id(rs.getInt("type_id"));                    b.setDescript(rs.getString("descript"));                    b.setPrice(rs.getBigDecimal("price"));                    b.setImg(rs.getString("img"));                    b.setSaling(rs.getInt("saling"));                    foodList.add(b);                }            } catch (Exception e) {                e.printStackTrace();            }        }catch (Exception e){            e.printStackTrace();        }        return foodList;    }    @Override    public  Food findFood_id(int id) throws Exception {        String sql = "select * from t_food where id=?";       Food b = null;        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql)        ) {            ps.setInt(1, id);            try (                    ResultSet rs = ps.executeQuery()            ) {                //将查询出的结果数据封装到Food对象中                if(rs.next()){                    b = new Food();                    b.setId(rs.getInt("id"));                    b.setFoodname(rs.getString("foodname"));                    b.setType_id(rs.getInt("type_id"));                    b.setDescript(rs.getString("descript"));                    b.setPrice(rs.getBigDecimal("price"));                    b.setSaling(rs.getInt("saling"));                    b.setImg(rs.getString("img"));                    return b;                }            } catch (Exception e) {                e.printStackTrace();            }        }catch (Exception e){            e.printStackTrace();        }        return b;    }}
      
     

 

Html代码

index.html

    
             
     
    
      
        
       
            
        小郡肝火锅            
        
            
        
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