Question

我正在尝试从数据库中删除多行。目前，我有一个数组，其中包含我要删除的所有行ID。但是我似乎找不到合适的代码

  func deleteMultiple(Id:[Int]) -> NSMutableArray {
    sharedInstance.databese!.open()

    var i:Int = Id.count
    print(Id, i)
    let resultSet:FMResultSet! = sharedInstance.databese!.executeQuery("DELETE FROM Info WHERE Id = ?", withArgumentsIn: Id)

    let itemInfo:NSMutableArray = NSMutableArray ()
    if (resultSet != nil)
    {
        while resultSet.next() {

            let item:Tbl_Info = Tbl_Info()
            item.Id = Int(resultSet.int(forColumn: "Id"))
            item.Name = String(resultSet.string(forColumn: "Name")!)
            item.LastName = String(resultSet.string(forColumn: "LastName")!)

            itemInfo.add(item)
        }
    }

    sharedInstance.databese!.close()
    return itemInfo

}

Answer 1

您可以在队列中执行查询，这不会冻结数据库。

如果在事务处理期间发生任何故障，则FMDB提供回滚功能。查看示例代码。

sharedInstance.databese.dbQueue.inTransaction { db, rollback in
     idArray.forEach {id in
     do {
            let resultSet:FMResultSet! = try db.executeQuery("DELETE FROM Info WHERE Id = ?", withArgumentsIn: Id)
            //Do whatever with your resultSet
        } catch {
            //Error occured during deleting from database.
            rollback.pointee = true
        }
     }
  }

快速使用数组从FMDB中删除数据

1 个答案: