DTcms.DAL/DTcms.DAL/users.cs

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using DTcms.Common;
using DTcms.DBUtility;
using DTcms.Model;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;

namespace DTcms.DAL
{
	public class users
	{
		private string databaseprefix;

		public users(string _databaseprefix)
		{
			this.databaseprefix = _databaseprefix;
		}

		public bool Exists(int id)
		{
			StringBuilder strSql = new StringBuilder();
			strSql.Append("select count(1) from " + this.databaseprefix + "users");
			strSql.Append(" where id=@id ");
			SqlParameter[] parameters = new SqlParameter[]
			{
				new SqlParameter("@id", SqlDbType.Int, 4)
			};
			parameters[0].Value = id;
			return DbHelperSQL.Exists(strSql.ToString(), parameters);
		}

		public bool Exists(string user_name)
		{
			StringBuilder strSql = new StringBuilder();
			strSql.Append("select count(1) from " + this.databaseprefix + "users");
			strSql.Append(" where user_name=@user_name ");
			SqlParameter[] parameters = new SqlParameter[]
			{
				new SqlParameter("@user_name", SqlDbType.NVarChar, 100)
			};
			parameters[0].Value = user_name;
			return DbHelperSQL.Exists(strSql.ToString(), parameters);
		}

		public bool Exists(string reg_ip, int regctrl)
		{
			StringBuilder strSql = new StringBuilder();
			strSql.Append("select count(1) from " + this.databaseprefix + "users");
			strSql.Append(" where reg_ip=@reg_ip and DATEDIFF(hh,reg_time,getdate())<@regctrl ");
			SqlParameter[] parameters = new SqlParameter[]
			{
				new SqlParameter("@reg_ip", SqlDbType.NVarChar, 30),
				new SqlParameter("@regctrl", SqlDbType.Int, 4)
			};
			parameters[0].Value = reg_ip;
			parameters[1].Value = regctrl;
			return DbHelperSQL.Exists(strSql.ToString(), parameters);
		}