commonyishi.aspx.cs

本系统为数据库课程设计

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;
namespace mybook
{
	/// <summary>
	/// commonyishi 的摘要说明。
	/// </summary>
	public class commonyishi : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox TextBox1;
		protected System.Web.UI.WebControls.Button Button1;
		protected System.Web.UI.WebControls.Button Button2;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		}
		private void Button1_Click(object sender, System.EventArgs e)
		{
			string message=this.show();
			TextBox1.Text=message;
		}

		public SqlConnection connection()   //设置数据库连接
		{
			string Afile="server=;uid=sa;pwd=sa;database=mybook";		
			SqlConnection AconnStr=new SqlConnection(Afile);
			return AconnStr;
		}
		public void close(SqlConnection AconnStr)//关闭连接
		{
			AconnStr.Close();
		}
		public SqlDataReader selCommand(string comd,SqlConnection AconnStr) //设置数据库查询操作命令
		{
			SqlCommand Acmd=new SqlCommand(comd,AconnStr);
			SqlDataReader sdr=null;
			AconnStr.Open();
			try
			{
				//执行命令，获取数据流
				sdr=Acmd.ExecuteReader();
				return sdr;
			}
			catch(Exception e)
			{
				if(e!=null)
				{
					Console.Write("执行出错");				
				}	
				return null;		
			}
		
		}

		public string show()
		{
			SqlConnection scon=this.connection();
			string select="select * from yishi"; 
			SqlDataReader sdr=this.selCommand(select,scon);
			string info="";
			if(sdr!=null)
			{
				//按记录顺序使用数据流
				
				info+="图书号\t图书名\t读者借书证号\n";
				while(sdr.Read())
				{
					info+=sdr["tushuno"].ToString();
					info+=sdr["tushuname"].ToString();
					
					info+=sdr["duzheno"].ToString()+"\n";
				}
				sdr.Close();  //关闭数据流
			}
			return info;
			
		}

		private void TextBox1_TextChanged(object sender, System.EventArgs e)
		{
		
		}

		private void Button2_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("fistpage.aspx");
		}
	}
}