winform - 读取数据库

  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;                                  // 引用【AD0.NET】命名空间
 11 using System.Data.SqlClient;                 // sql
 12
 13 namespace DataBase
 14 {
 15     public partial class Form1 : Form
 16     {
 17         public Form1()
 18         {
 19             InitializeComponent();
 20         }
 21
 22         // 窗体载入
 23         private void Form1_Load(object sender, EventArgs e)
 24         {
 25             //编号, 品名, 规格, 材质, 库存, 价格, 仓库
 26             this.lstviewRecordData.Items.Clear();
 27             this.lstviewRecordData.View = View.Details;        // lstviewRecordData视图样式: 详细信息
 28             this.lstviewRecordData.GridLines = true;              // 网格线
 29             this.lstviewRecordData.CheckBoxes = true;         // 复选框
 30             ColumnHeader ch = new ColumnHeader();
 31             ch.Text = "编号";                                                         // 标题
 32             ch.TextAlign = HorizontalAlignment.Center;          // 居中
 33             ch.Width = 50;                                                            // 宽度
 34             this.lstviewRecordData.Columns.Add(ch);            // 添加列头
 35             this.lstviewRecordData.Columns.Add("品名", 80, HorizontalAlignment.Center);
 36             this.lstviewRecordData.Columns.Add("规格",180, HorizontalAlignment.Center);
 37             this.lstviewRecordData.Columns.Add("材质", 80, HorizontalAlignment.Center);
 38             this.lstviewRecordData.Columns.Add("库存", 100, HorizontalAlignment.Center);
 39             this.lstviewRecordData.Columns.Add("价格", 100, HorizontalAlignment.Center);
 40             this.lstviewRecordData.Columns.Add("仓库", 100, HorizontalAlignment.Center);
 41             this.lstviewRecordData.FullRowSelect = true;
 42
 43         }
 44         private void btnReadDataBase_Click(object sender, EventArgs e)
 45         {
 46             lstviewRecordData.Items.Clear();
 47             // 绑定数据库
 48             BindDataBase();
 49         }
 50
 51         /// <summary>   绑定数据库
 52         ///
 53         /// </summary>
 54         private void BindDataBase()
 55         {
 56             // 连接指定数据库
 57             SqlConnection conn = new SqlConnection();
 58
 59             /***********************************************************************
 60              *  使用字符串声明连接所需要的信息:
 61              *      1. 服务器;
 62              *      2. 数据库 ;
 63              *      3. 验证:
 64              *              3.1 Windows本地验证: Integrated Security = true;
 65              *              3.2 SqlServer验证: user id = 登录名; password = 密码
 66             ***********************************************************************/
 67             conn.ConnectionString = "Server = 127.0.0.1; DataBase = DuanLaoYeDataBase;"+
 68                                     " user id = DuanLaoYe; password = 123456";
 69             try
 70             {
 71                 // 打开连接
 72                 conn.Open();
 73                 //MessageBox.Show(conn.State.ToString());       // 测试conn的状态,打开或关闭
 74
 75
 76                 // 构造数据库命令操作对象,用于执行T-SQL语句
 77                 SqlCommand cmd = new SqlCommand();
 78                 // 执行操作的T-SQL语句或者存储过程
 79                 cmd.CommandText = "select * from Steel";
 80                 // 执行操作所需要的连接
 81                 cmd.Connection = conn;
 82
 83
 84                 //声明结果集对象 , 用于检索数据 ; 结果集的来自cmd的ExecuteReader()方法
 85                 SqlDataReader dr = cmd.ExecuteReader();
 86                 // 遍历dr数据 , 判断有无数据可读
 87                 if (dr.HasRows)
 88                 {
 89                     // 开始更新数据, 挂起lstviewRecordData的UI绘制
 90                     this.lstviewRecordData.BeginUpdate();
 91                     while (dr.Read())           // 循环读取所有数据
 92                     {
 93                         ListViewItem lvi = new ListViewItem();
 94                         lvi.Text = dr[0].ToString();
 95                         for (int i = 1; i <= 6; ++i )
 96                         {
 97                             lvi.SubItems.Add(dr[i].ToString().Trim());
 98                         }
 99                         this.lstviewRecordData.Items.Add(lvi);
100                     }
101                     // 结束更新数据, 开始绘制UI(UI一次性绘制)
102                     this.lstviewRecordData.EndUpdate();
103                 }
104                 else
105                 {
106                     MessageBox.Show("结果集无数据!");
107                 }
108             }
109             catch (SqlException ex)
110             {
111                 MessageBox.Show("数据库操作遇到异常 : " + ex.Message);
112             }
113             finally
114             {
115                 // 判断当前的conn连接状态, 如果未关闭
116                 if (conn.State != ConnectionState.Closed)
117                 {
118                     // 则关闭连接
119                     conn.Close();
120                 }
121             }
122         }
123
124         private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
125         {
126             if (DialogResult.Yes == MessageBox.Show("确定删除当前所有选中数据?", "提示", MessageBoxButtons.YesNo))
127             {
128                 this.lstviewRecordData.BeginUpdate();
129                 // 遍历选中项
130                foreach (ListViewItem lvi in lstviewRecordData.SelectedItems)
131                {
132                    // 按索引删除选中项
133                    //this.lstviewRecordData.Items.RemoveAt(lvi.Index);
134
135                    // 按项删除选中项
136                    this.lstviewRecordData.Items.Remove(lvi);
137                }
138                this.lstviewRecordData.EndUpdate();
139             }
140         }
141     }
142 }