winform - 数据适配器SqlDataAdapter

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Drawing;
 5 using System.Linq;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 using System.Windows.Forms;
 9
10 using System.Data;
11 using System.Data.SqlClient;
12
13 namespace DataBase_SqlDataAdapter
14 {
15     public partial class Form1 : Form
16     {
17         public Form1()
18         {
19             InitializeComponent();
20         }
21
22         private void button1_Click(object sender, EventArgs e)
23         {
24             // 清理listBox1
25             listBox1.Items.Clear();
26
27             //从数据库Employee中读取教师名字存储到listBox1
28             BindDataWithListbox();
29         }
30
31         //从数据库Employee中读取教师名字存储到listBox1
32         private void BindDataWithListbox()
33         {
34             // 连接数据库的字符串
35             string selectConnectionString = "Server = 192.0.0.1; DataBase = DuanLaoYeDataBase; UID = DuanLaoYe; PWD = 123456";
36             // 执行查询Employee表的T-SQL语句
37             string selectCommandText = "select * from Employee";
38             //创建适配器 : 适配器会自动打开和关闭适配器自己打开的数据库连接
39             using( SqlDataAdapter sda= new SqlDataAdapter(selectCommandText, selectConnectionString) )
40             {
41                 // 在内存中创建数据表
42                 DataTable dt = new DataTable();
43
44                 // 将适配器读取到的结果集存储到DataTable中
45                 sda.Fill(dt);
46
47                 // 方法1 : 绑定数据源: 从DataTable表中获取
48                 listBox1.DataSource = dt;
49                 listBox1.DisplayMember = "Emp_Name";    // Employee表的Emp_Name字段名
50                 listBox1.ValueMember = "Emp_ID";             //  Employee表的Emp_ID字段名
51
52                 /***********************************************************************
53                  * 方法2:
54                 listBox1.BeginUpdate();
55                 foreach(DataRow dr in dt.Rows)
56                 {
57                     listBox1.Items.Add(dr[1].ToString().Trim());
58                 }
59                 listBox1.EndUpdate();
60                 ***********************************************************************/
61
62             }
63         }
64     }
65 }