bookborrow.aspx.cs

代码为图书馆管理系统软件

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
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.Web.Security;
using DBase;

namespace Library
{
	/// <summary>
	/// ReaderInfo 的摘要说明。
	/// </summary>
	public class BookBorrow : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Panel Panel2;
		protected System.Web.UI.WebControls.Label lblMessage;
		protected System.Web.UI.WebControls.LinkButton LinkReaderInfo;
		protected System.Web.UI.WebControls.LinkButton LinkBookBorrow;
		protected System.Web.UI.WebControls.LinkButton LinkBorrowHistory;
		protected System.Web.UI.WebControls.LinkButton LinkSignOut;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
		protected System.Web.UI.WebControls.Label Label1;
	
		SqlDataAdapter da;
		DataSet ds = new DataSet();
		static string id;

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!IsPostBack)
			{
				id=Request.QueryString["id"];
				loadData(id);
			}
			Response.Buffer=true;
			Response.ExpiresAbsolute=DateTime.Now.AddSeconds(-1);
			Response.Expires=0;
			Response.CacheControl="no-cache";
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.LinkReaderInfo.Click += new System.EventHandler(this.LinkReaderInfo_Click);
			this.LinkBookBorrow.Click += new System.EventHandler(this.LinkBookBorrow_Click);
			this.LinkBorrowHistory.Click += new System.EventHandler(this.LinkBorrowHistory_Click);
			this.LinkSignOut.Click += new System.EventHandler(this.LinkSignOut_Click);
			this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
			this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void LinkReaderInfo_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("ReaderInfo.aspx");
		}

		private void LinkBookBorrow_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("BookBorrow.aspx?id=" + id);
		}

		private void LinkBorrowHistory_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("BorrowHistory.aspx?id=" + id);
		}

		private void LinkSignOut_Click(object sender, System.EventArgs e)
		{
			FormsAuthentication.SignOut();
			Response.Redirect("../logout.aspx");
		}


		private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			if(e.CommandName=="Continue")
			{
				if(Check(e.Item.Cells[0].Text.ToString()))
				{
					Continue(e.Item.Cells[0].Text.ToString());
				}
				else
				{
					this.lblMessage.Text = "该书已经不可以续借！";
				}
			}
		}

		private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
		{
			this.DataGrid1.CurrentPageIndex = e.NewPageIndex;
			BindGrid();
		}

		void loadData(string id)
		{
			string str = "SELECT BorrowID,Borrow.BookID,BookName,BorrowDate,PromiseReturnDate from Borrow,Book where Borrow.BookID=Book.BookID and ReaderID='"+ id +"'";
			try
			{
				if(DB.cn.State == ConnectionState.Closed)
				{
					DB.cn.Open();
				}
				da = new SqlDataAdapter(str,DB.cn);
				ds.Clear();
				da.Fill(ds,"Borrow");
				BindGrid();				
				DB.cn.Close();
				this.lblMessage.Text = "";
			}
			catch
			{
				this.lblMessage.Text ="数据加载失败，请重试一次！";
			}
		}

		void BindGrid()
		{
			this.DataGrid1.DataSource = ds.Tables["Borrow"];
			this.DataGrid1.DataBind();
		}

		bool Check(string BorrowID)
		{
			string str = "SELECT Renewal from Borrow where BorrowID="+ BorrowID;
			SqlCommand com = new SqlCommand(str,DB.cn);
			try
			{
				if(DB.cn.State == ConnectionState.Closed)
				{
					DB.cn.Open();
				}
				
				SqlDataReader myr = com.ExecuteReader();
				if(myr.Read())
				{
					if(Int32.Parse(myr.GetValue(0).ToString())==1)
					{
						myr.Close();
						return true;
					}
				}
				myr.Close();
				DB.cn.Close();
				this.lblMessage.Text = "";
			}
			catch
			{
				;
			}
			return false;
		}

		void Continue(string BorrowID)
		{
			string str = "update borrow set PromiseReturnDate=DATEADD(day,30,PromiseReturnDate),Renewal=0 where BorrowID=" + BorrowID;
			SqlCommand com = new SqlCommand(str,DB.cn);
			try
			{
				if(DB.cn.State == ConnectionState.Closed)
				{
					DB.cn.Open();
				}
				com.ExecuteNonQuery();
				DB.cn.Close();
				loadData(id);
				this.lblMessage.Text = "续借成功！";
			}
			catch
			{
				this.lblMessage.Text = "图书续借失败，请重试一次！";
			}
		}
	}
}