public class UserBase {
private string userID; public string UserID {
get { return userID; } set { userID = value; } }
private string userPSW; public string UserPSW {
get { return userPSW; } set { userPSW = value; } }
public string loginCheck(string uid, string upwd, string urole) {
String selectStr = String.Empty; switch (urole) {
case "0": //身份为教师时 selectStr = "Select * from Teacher where teaID = '" + uid + "'"; break;
case "1": //身份为学生时
selectStr = "Select * from Student where stuID = '" + uid + "'"; break;
case "2": //身份为管理员时
selectStr = "Select * from Users where adminName = '" + uid + "'"; break; default:
return null; }
Database db = new Database();
DataTable dt = db.GetDataTable(selectStr); if (dt.Rows.Count > 0) //如果该用户存在 {
if (dt.Rows[0][1].ToString().Equals(upwd)) //密码正确 {
switch (urole) {
case "0": //身份为教师时 return "0";
case "1": //身份为学生时 return "1";