lend/LendBook.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class lend_LendBook : System.Web.UI.Page
{
    DataBaseHelper dbHelper = new DataBaseHelper();
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            try
            {
                string bookid = Request.QueryString["BOOKID"];
                this.hfdBookID.Value = bookid;
                string sql = "select * from book where bookid=@BOOKID";
                SqlParameter param = new SqlParameter("@BOOKID", SqlDbType.Char);
                param.Value = bookid;

                DataTable dtData = dbHelper.Select(sql, new SqlParameter[] { param });
                if (dtData != null && dtData.Rows.Count > 0)
                { 
                    DataRow drData = dtData.Rows[0];
                    this.lblName.Text = drData["bookname"].ToString();
                    this.lblISDN.Text = drData["ISDN"].ToString();
                    this.lblPublisher.Text = drData["publisher"].ToString();
                    this.lblDescription.Text = drData["description"].ToString();
                }

            }
            catch
            {
                
            }
        }
    }
    protected void btnLend_Click(object sender, EventArgs e)
    {
        string userID = this.checkBorrower(txtBorrower.Text.Trim());
        if (userID == null)
        {
            Response.Write("<script type='text/javascript'> alert('用户不存在！');</script>");
            return;
        }

        string sql = "update book set borrower=@BORRORER where bookid=@BOOKID";

        SqlParameter borrower = new SqlParameter("@BORRORER", SqlDbType.Char);
        borrower.Value = userID;