borrowbook.aspx.cs

实现了图书管理系统

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MyLibrary.BusinessLogicLayer;

public partial class Borrow_BorrowBook : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    //借阅按钮单击事件
    protected void imgBtnBorrow_Click(object sender, ImageClickEventArgs e)
    {
        if (Page.IsValid)
        {
            Borrow borrow = new Borrow();//创建Borrow类对象
            Users user = new Users();//创建Users类对象
            user.UserID = txtUserID.Text.Trim();//为user对象属性UserID赋值
            int BorrowNum = 0;
            if (user.LoadData(user.UserID))//查询用户并取出用户权限
            {
                int userPower = user.UserPower;
                if (userPower == 3)//学生
                {
                    BorrowNum = 10;//最大借书量10本
                    borrow.BorrowEndDate = Convert.ToDateTime(System.DateTime.Now.AddMonths(1).ToString());//借阅时间为1个月
                }
                else if (userPower == 4)//教师
                {
                    BorrowNum = 20;//最大借书量20本
                    borrow.BorrowEndDate = Convert.ToDateTime(System.DateTime.Now.AddMonths(3).ToString());//借阅时间为1个月
                }
                borrow.UserID = txtUserID.Text.Trim();
                int count = borrow.QueryCurrentBorrowCount(txtUserID.Text.Trim());//查询用户已经借阅图书量
                if (count < BorrowNum)//如果还没有超出最大借书量，借书
                {
                    borrow.BookID = int.Parse(txtBookID.Text.Trim());
                    borrow.BorrowBeginDate = Convert.ToDateTime(System.DateTime.Now.ToString());
                    borrow.BorrowState = 0;
                    if (borrow.InsertByProc())//使用Borrow类InsertByProc方法插入一条借阅记录
                    {
                        lblMessage.Text = "成功借阅该书！";
                    }
                    else
                    {
                        lblMessage.Text = "借书失败！";
                    }
                }
                else//超出借书量，不能继续借书，给出提示
                {
                    lblMessage.Text = "该用户已借满！";
                }
            }
            else//不存在该用户提示
            {
                lblMessage.Text = "不存在该用户！";
            }
        }
    }
}