此行为的发生是由于在“数据窗体向导”中未选择数据库表的主键或“非null”列。
"This behavior occurs because the primary key or the" not NULL "column of the database table was not selected in the data Form Wizard."
然后，您可以在应用程序开发中使用格式化和类型化的数据集，包括可以使用数据窗体向导生成数据窗体。
You can then use your formatted and typed dataset in your application development, including the ability to generate data forms using the data form wizard.
若要解决此问题，请在添加数据窗体时通过使用“数据窗体向导”选择所选表中的以下列：主列和不允许NULL 的列。
To work around this problem, select the following columns of the selected table when you add a data form by using the Data Form Wizard: the primary column and a column that does not permit NULLs.
对于应用程序开发，除了可以拖放数据对象外，还可以使用数据适配器向导将这些数据适配器拖放到窗体中并配置它们。
For application development, in addition to being able to drag and drop data objects, you could also drag and drop these data adapters onto forms and configure them using the data adapter wizard.
如果有任何表、查询、窗体、报表、数据页、宏或模块窗口处于打开状态，则“升级向导”均可能产生不可预测的结果。
The Upsizing Wizard may produce unpredictable results if any table, query, form, report, data page, macro or module Windows are open.
如果有任何表、查询、窗体、报表、数据页、宏或模块窗口处于打开状态，则“升级向导”均可能产生不可预测的结果。
The Upsizing Wizard may produce unpredictable results if any table, query, form, report, data page, macro or module Windows are open.
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