id=_connection.QueryFirstOrDefault<int?>(" select id from dc_report_invest_return_sku where sku=@sku and project=@project limit 1 ",new{sku=item.skuCode,project="BP代运营"})??0
// id = _connection.QueryFirstOrDefault<int?>(" select id from dc_report_invest_return_sku where sku=@sku and project=@project limit 1 ", new { sku = item.skuCode, project = "BP代运营" }) ?? 0