logindaoimpl.cs

一个超市管理系统,没有错误,非常好,里面什么都有!很使用,很有用

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using DaFanRongMIS.Model.Common;

namespace DaFanRongMIS.Model.Login
{
    class LoginDAOImpl:LoginDAO
    {
        public string Login(LoginEntity LE)
        {
            string str = null;
            try
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = ConnectionDataBase.getConOpen();
                cmd.CommandText = "select count(*) from Login,CashRegister where Login.UserID=@UserID and Login.Password=@Password and CashRegister.MAC=@MAC and Login.CashRegisterID=CashREgister.ID";
                cmd.Parameters.Add("@UserID",LE.UserID);
                cmd.Parameters.Add("@Password",LE.Password);
                cmd.Parameters.Add("@MAC",LE.mAC);
                int i = 0;
                i = Convert.ToInt32(cmd.ExecuteScalar());
                if (i > 0)
                {
                    str = "OK";
                }
                else 
                {
                    cmd.CommandText = "select count(*) from Login where Login.UserID=@UserID and Login.Password=@Password";
                    int j = 0;
                    j = Convert.ToInt32(cmd.ExecuteScalar());
                    if (j > 0)
                    {
                        str = "Error";
                    }
                }
            }
            catch (Exception e)
            {
                str = e.Message;
            }
            finally
            {
                ConnectionDataBase.getConClose();
            }
            return str;
        }
       
    }
}