餐厅项目查询

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 using System.Windows.Forms;
10 using System.Data.SqlClient;
11 
12 namespace 餐厅
13 {
14     public partial class Form1 : Form
15     {
16 
17 
18 
19         public Form1()
20         {
21             InitializeComponent();
22         }
23 
24         private void Form1_Load(object sender, EventArgs e)
25         {
26             LoadDeskInfoByDelFlag(0);
27 
28         }
29 
30         private void LoadDeskInfoByDelFlag(int p)
31         {
32             //新建集合
33             List<DeskInfo> list = new List<DeskInfo>();
34             //数据库字符串
35             string str = "Data Source=.;Initial Catalog=mysql;Integrated Security=True";
36             //sql语句，flag为0的餐桌
37             string sql = "select DeskId,DeskName,DeskNamePinYin,DeskNum from DeskInfo where DeskDelFlag = " + p;
38             //string sql = "select * from DeskInfo";
39             SqlConnection con = new SqlConnection(str);
40             con.Open();
41             SqlCommand cmd = new SqlCommand(sql, con);
42             //cmd.reader为查询
43             SqlDataReader reader = cmd.ExecuteReader();
44             //判断是否读取了一行
45             if (reader.HasRows)
46             {
47                 //当读取的时候
48                 while (reader.Read())
49                 {
50                     //实例化餐桌类，为每个属性赋值，值为数据库里的值，进行类型转换
51                     DeskInfo dk = new DeskInfo();
52                     dk.DeskId = Convert.ToInt32(reader["DeskId"]);
53                     dk.DeskName = reader["DeskName"].ToString();
54                     dk.DeskNamePinYin = reader["DeskNamePinYin"].ToString();
55                     dk.DeskNum = reader["DeskNum"].ToString();
56                     //把属性添加进list
57                     list.Add(dk);
58                 }
59 
60             }
61             //禁止自动生成列，没有delflag那一列了。
62             dgv.AutoGenerateColumns = false;
63             //绑定数据
64             dgv.DataSource = list;
65 
66             //关闭数据库各项
67             con.Dispose();
68             cmd.Dispose();
69             reader.Dispose();
70         }
71     }
72 }