使用Dapper查询记录是否存在

/// <summary>
    /// dapper数据访问抽象基础类
    /// </summary>
    public class dapperhelper
    {
        public static string connectionstring = desencrypt.decrypt(configurationmanager.connectionstrings["soacon"].connectionstring);
        /// <summary>
        /// 连接数据库
        /// </summary>
        /// <returns></returns>
        public static idbconnection dbconnection()
        {
            var connection = new sqlconnection(connectionstring);//连接sql server数据库
            connection.open();
            return connection;
        }

        /// <summary>
        /// 执行是否存在数据
        /// </summary>
        /// <typeparam name="t"></typeparam>
        /// <param name="sqlstr">查询（例：select count(1)  from xxx ）</param>
        /// <param name="param">匿名类型</param>
        /// <returns></returns>
        public static bool exists(string sqlstr, object param)
        {
            using (idbconnection conn = dapperhelper.dbconnection())
            {
                int count = conn.query<int>(sqlstr, param).firstordefault();
                return count > 0 ? true : false;
            }
        }
    }

调用：

#region 判断是否存在库存（不论热前还是热后）

        /// <summary>
        /// 判断是否存在库存（不论热前还是热后）
        /// </summary>
        /// <param name="processcardnumber">流转卡号</param>
        /// <returns></returns>
        public bool existinventory(string processcardnumber)
        {
            string sqlstr = " select count(1) from udtwip_inventory where processcardnumber=@processcardnumber ";
            return dapperhelper.exists(sqlstr, new { processcardnumber = processcardnumber });
        }


        #endregion