DTcms.DAL/DTcms.DAL/user_attach_log.cs

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

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

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

		public bool Exists(int id)
		{
			StringBuilder strSql = new StringBuilder();
			strSql.Append("select count(1) from " + this.databaseprefix + "user_attach_log");
			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 int Add(DTcms.Model.user_attach_log model)
		{
			StringBuilder strSql = new StringBuilder();
			strSql.Append("insert into " + this.databaseprefix + "user_attach_log(");
			strSql.Append("user_id,user_name,attach_id,file_name,add_time)");
			strSql.Append(" values (");
			strSql.Append("@user_id,@user_name,@attach_id,@file_name,@add_time)");
			strSql.Append(";select @@IDENTITY");
			SqlParameter[] parameters = new SqlParameter[]
			{
				new SqlParameter("@user_id", SqlDbType.Int, 4),
				new SqlParameter("@user_name", SqlDbType.NVarChar, 100),
				new SqlParameter("@attach_id", SqlDbType.Int, 4),
				new SqlParameter("@file_name", SqlDbType.NVarChar, 255),
				new SqlParameter("@add_time", SqlDbType.DateTime)
			};
			parameters[0].Value = model.user_id;
			parameters[1].Value = model.user_name;
			parameters[2].Value = model.attach_id;
			parameters[3].Value = model.file_name;
			parameters[4].Value = model.add_time;
			object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters);
			int result;
			if (obj == null)
			{
				result = 0;
			}
			else