/// <summary>
        /// 核查表是否存在
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <returns></returns>
        public bool ExistTable(string tableName)
        {
            var    sqlHelper = new SqlHelper.SqlHelper();
            string cmdText   = string.Format("SELECT Count(*) FROM SYSOBJECTS WHERE ID = OBJECT_ID('{0}') AND OBJECTPROPERTY(ID, 'IsUserTable') = 1", tableName);

            return(sqlHelper.ExecuteScalar(cmdText).ToInt() > 0 ? true : false);
        }
        /// <summary>
        /// 核查字段是否存在
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <param name="fieldName">字段名</param>
        /// <returns></returns>
        public bool ExistField(string tableName, string fieldName)
        {
            var sqlHelper = new SqlHelper.SqlHelper();
            //查询字段
            string cmdTextField = string.Format("select Count(*) from syscolumns where id=object_id('{0}') and name='{1}'", tableName, fieldName);

            return(sqlHelper.ExecuteScalar(cmdTextField).ToInt() > 0 ? true : false);
        }