我在zendFramework2中有一个不工作的查询，它显示未知列我的查询$select=newSelect('dining_table_reservation');$select->columns(array('range'=>new\Zend\Db\Sql\Expression("CONCAT(5*floor(dining_table.SeatingCapacity/5),'-',5*floor(dining_table.SeatingCapacity/5)+5)"),'Avgtime'=>new\Zend\Db\Sql\Expression('avg(timestampdiff(

我正在尝试将我的iOS应用程序转换为Swift。一切都很顺利，直到我尝试用.swift等效项替换我的AppDelegate.m/.h。现在，在构建时，出现以下错误:Ld/Users/ruben/Library/Developer/Xcode/DerivedData/Bowdoin_Dining-eevtozmixiiwpkdhanzlqfsrhfxr/Build/Products/Debug-iphonesimulator/Bowdoin\Dining.app/Bowdoin\Diningnormali386cd"/Users/ruben/Workspace/Development/O