                 var item = YTKKeyValueItem_Swift()
                 item.itemId = objectId
                 item.itemObject = YTKObject(value: filter.first![self.json] )
-                item.createdTime = filter.first!.get(self.createTime)
+                item.createdTime = filter.first!.get(self.createdTime)
                 return item
             }
             

        db?.create(table: db![tableName] , ifNotExists : true){t in
            t.column(self.id)
            t.column(self.json)
            t.column(self.createTime, defaultValue: NSDate())
            t.primaryKey(self.id)
        }
    }

    
    private let id = Expression<String>("id")
    private let json = Expression<String>("json")
    private let createdTime = Expression<NSDate>("createdTime")

    /**
    检查名字是否合法
