Web应用开发:ASP.NET 大学场地预约借用系统
5.2 后台
登录页面
后台代码进行校验,需要先将密码转成MD5密文,然后实行字符串匹配:
string username = Request.Params["inputEmail"].ToString();
string password = MD5Helper.ToMD5(Request.Params["inputPassword"].ToString());
if (DBHelper.ExecuteQuery("select * from WebUser where username='" + username + "' and password='" + password + "'").Tables[0].Rows.Count > 0)
{
//放一个Cookie来指示是哪名用户登陆了
HttpCookie cookie = new HttpCookie("login_name", username);
Response.Cookies.Add(cookie);
Response.Redirect("indextem.aspx");
}
else
{
Response.Write("<script language=javascript>alert('用户名或密码错误');</script>");
}
注册页面的前端类似,后端代码以数据库插入为主,需要判断用户名是否重复,如下:
var name = Request["regName"];
if (!string.IsNullOrEmpty(name))
{
if (DBHelper.ExecuteQuery("select * from WebUser where username='" + name + "'").Tables[0].Rows.Count > 0)
{
//检测该用户名是否注册
Response.Write("<script language=javascript>alert('注册失败,用户名已被使用!');</script>");
}
else
{
var passwd = Request["regPassword"];
passwd = MD5Helper.ToMD5(passwd.ToString());
var telephone = Request["regTelephone"];
var sql = "INSERT INTO WebUser(username,password,telephone) VALUES ('{0}','{1}','{2}')";
sql = string.Format(sql, name, passwd, telephone);
if (SqlHelper.ExecuteSql(sql) > 0)
{
var str = "注册成功,您的用户名:" + name + " ,现在去登录试试吧~";
Response.Write("<script language=javascript>alert('" + str + "');</script>");
}
else
{
Response.Write("<script language=javascript>alert('注册失败,数据库出错!');</script>");
}
}
}
预约页面
预定的后台处理代码,后台需要做预定冲突的检测:
string[] bookTime = context.Request["bookTime"].Split('-');
string bookSt = bookTime[0].Trim();
string bookEt = bookTime[1].Trim();
string bookDate = DateTime.Now.AddDays(1).ToString("yyyy-MM-dd");
string roomNumber = context.Request["roomNo"];
//预定时间区间判断
var bookInfoSql = "select BookSt, BookSt from BookInfo where " +
"BookDate='{0}' And RoomNumber='{1}'";
bookInfoSql = string.Format(bookInfoSql, bookDate, roomNumber);
DataTable dtBookInfo = SqlHelper.getDataTable(bookInfoSql);
Boolean notOverlap = true;
for (int i = 0; i < dtBookInfo.Rows.Count; i++)
{
//大于已预约右边,小于已预约左边
notOverlap &= ( (string.Compare(bookSt, dtBookInfo.Rows[i][1].ToString().Trim(), true) > 0) ||
(string.Compare(bookEt, dtBookInfo.Rows[i][0].ToString().Trim(), true) < 0) );
}
if (!notOverlap)
{
context.Response.Write("该时间段已经有别人预约啦,请重新选择!");
}
else
{
string customerName = context.Request.Cookies["login_name"].Value;
string myRemark = context.Request["myRemark"];
if (string.IsNullOrEmpty(myRemark))
{
myRemark = "无";
}
DateTime dt1 = DateTime.Parse(bookDate + " " + bookSt);
DateTime dt2 = DateTime.Parse(bookDate + " " + bookEt);
TimeSpan ts = dt2.Subtract(dt1);
double bookDurationHours = Math.Round(ts.TotalHours, 2);
DataTable dtLastID = SqlHelper.getDataTable("select top 1 ID from BookInfo order by ID DESC");
string insIdStr = dtLastID.Rows[0][0].ToString();
int insId = int.Parse(insIdStr) + 1;
//插入到数据库中去
var bookSql = "INSERT INTO BookInfo(ID, CustomerName,MyRemark,BookDate,BookSt,BookDuration,RoomNumber,BookEt) " +
"VALUES ({0},'{1}','{2}','{3}','{4}','{5}','{6}','{7}')";
bookSql = string.Format(bookSql, insId, customerName, myRemark, bookDate, bookSt, bookDurationHours,
roomNumber, bookEt);
if (SqlHelper.ExecuteSql(bookSql) > 0)
{
context.Response.Write("预定成功!");
}
else
{
context.Response.Write("后台数据插入出错!");
}
}
获取预订时间段后台处理代码:
string roomNum = context.Request["roomNo"];
var sqlBookSp = "select BookSt, BookEt from BookInfo " +
"where BookDate = '" + DateTime.Now.AddDays(1).ToString("yyyy-MM-dd") + "' and RoomNumber = '{0}' order by BookSt";
sqlBookSp = string.Format(sqlBookSp, roomNum);
DataTable dtTimeSp = SqlHelper.getDataTable(sqlBookSp);
string sJson2 = JsonConvert.SerializeObject(dtTimeSp);
context.Response.Write(sJson2);
break;
取消预约的代码:
//删除预订的数据
string[] delListStr = context.Request["cancel"].Split(',');
int totalCancel = 0;
foreach(var delRoom in delListStr)
{
var delSql = "delete from BookInfo where ID = " + delRoom;
if (SqlHelper.ExecuteSql(delSql) > 0)
{
totalCancel++;
}
}
context.Response.Write("取消预订完成,共取消 " + totalCancel.ToString() + " 间教室!");
6、运行效果图
登录
注册:
预订(可以手动刷新教室信息):
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