DAL/Admin/Admin.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;
using DBUtility;

namespace DAL.Admin
{
    public class Admin
    {

        public bool UpdatePassWord(Model.Admin.Admin model) 
        {
            string sql = "update Admin set PassWord = @PassWord where LoginName = @LoginName";
            SqlParameter[] param = new SqlParameter[] { 
                new SqlParameter("@PassWord",SqlDbType.VarChar),
                new SqlParameter("@LoginName",SqlDbType.VarChar)
            };
            param[0].Value = model.PassWord;
            param[1].Value = model.LoginName;
            if (DbHelperSQL.ExecuteSql(sql, param) > 0) { return true; }
            else { return false; }
        }

        public bool UpdateLoginInfo(Model.Admin.Admin model) 
        {
            string sql = "update Admin set LastLoginIP=@LastLoginIP,LastLoginTime=getdate() where LoginName = @LoginName";
            SqlParameter[] param = new SqlParameter[] { 
            new SqlParameter("@LastLoginIP",SqlDbType.VarChar),
            new SqlParameter("@LoginName",SqlDbType.VarChar)
            };
            param[0].Value = model.LastLoginIP;
            param[1].Value = model.LoginName;
            if (DbHelperSQL.ExecuteSql(sql, param) > 0) { return true; }
            else { return false; }
        }

        public bool CheckLogin(string LoginName, string PassWord) 
        {
            string sql = "select * from Admin where LoginName = @LoginName and PassWord = @PassWord ";
            SqlParameter[] param = new SqlParameter[] { 
            new SqlParameter("@LoginName",SqlDbType.VarChar),
            new SqlParameter("@PassWord",SqlDbType.VarChar)
            };
            param[0].Value = LoginName;
            param[1].Value = PassWord;
            if (DbHelperSQL.Exists(sql, param))
            {
                return true;
            }
            else {
                return false;
            }
        }

        public bool HasAdmin(string LoginName) 
        {
            string sql = "select * from Admin where LoginName = @LoginName";
            SqlParameter[] param = new SqlParameter[] {