SQLServerDAL/d_users.cs

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using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using CAI.SHOP.IDAL;
using Maticsoft.DBUtility;//请先添加引用
namespace CAI.SHOP.SQLServerDAL
{
	/// <summary>
	/// 数据访问类d_users。
	/// </summary>
	public class d_users:Id_users
	{
		public d_users()
		{}
		#region  成员方法

		/// <summary>
		/// 得到最大ID
		/// </summary>
		public int GetMaxId()
		{
		return DbHelperSQL.GetMaxID("uid", "d_users"); 
		}

		/// <summary>
		/// 是否存在该记录
		/// </summary>
		public bool Exists(int uid)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select count(1) from d_users");
			strSql.Append(" where uid=@uid ");
			SqlParameter[] parameters = {
					new SqlParameter("@uid", SqlDbType.Int,4)};
			parameters[0].Value = uid;

			return DbHelperSQL.Exists(strSql.ToString(),parameters);
		}

        public bool Exists(string username, string password)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(*) from d_users ");
            strSql.Append("where username=@username and password=@password");
            SqlParameter[] parameters ={
                                        new SqlParameter("@username", SqlDbType.NVarChar,50),
					
					                    new SqlParameter("@password", SqlDbType.NVarChar,50)};
            parameters[0].Value = username;
            parameters[1].Value = password;
           return  DbHelperSQL.Exists(strSql.ToString(), parameters);

        
        
        }

        /// <summary>
        /// 是否存在该记录
        /// </summary>