using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;

namespace Example_8_1
{
	/// <summary>
	/// Summary description for MyDataTable.
	/// </summary>
	public class MyDataTable : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label SQLLabel;
		protected System.Web.UI.WebControls.DataGrid myDataGrid;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///創建DataTable對象
				CreateDataTable();
			}
		}

		private void CreateDataTable()
		{
			///從數據庫中獲取表記錄
			String cmdText = "SELECT Staff.*,Role.* FROM Staff "
				+ "INNER JOIN StaffRole ON Staff.Staff_ID = StaffRole.Staff_ID "
				+ "INNER JOIN Role ON Role.Role_ID = StaffRole.Role_ID";		
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///執行數據庫查詢
			myConnection.Open();
			SqlDataReader dr = myCommand.ExecuteReader();

			///創建DataTable對象
			DataTable dataTable = new DataTable();
			///添加新的數據列
			dataTable.Columns.Add("StaffID",typeof(int));
			dataTable.Columns.Add("StaffName",typeof(string));
			dataTable.Columns.Add("RealName",typeof(string));
			dataTable.Columns.Add("RoleID",typeof(int));
			dataTable.Columns.Add("RoleName",typeof(string));
			dataTable.Columns.Add("Birthday",typeof(DateTime));
			dataTable.Columns.Add("Email",typeof(string));

			while(dr.Read())
			{
				///添加新的數據行
				DataRow row = dataTable.NewRow();
				row["StaffID"]   = dr["Staff_ID"].ToString();
				row["StaffName"] = dr["Staff_Name"].ToString();
				row["RealName"]  = dr["RealName"].ToString();
				row["RoleID"]    = dr["Role_ID"].ToString();
				row["RoleName"]  = dr["Role_Name"].ToString();
				row["Birthday"]  = dr["Birthday"].ToString();
				row["Email"]     = dr["Email"].ToString();

				dataTable.Rows.Add(row);
			}
			dr.Close();
			myConnection.Close();	
	
			SQLLabel.Text = cmdText;

			myDataGrid.DataSource = dataTable;
			myDataGrid.DataBind();
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}