Write an OnUpdateData event handler to take specific actions prior to posting data changes to the database. If an application posts changes to the database and an OnUpdateData event handler exists, the handler is called before the dataset抯 Post method is executed. An OnUpdateData event handler might be useful for performing additional data processing or validation before posting
Write an OnDataChange event handler to take specific actions when a field in the current record has been edited and the application moves to another field, or when the current record in the associated dataset changes. OnDataChange is especially useful in applications that must synchronize data display in controls that are not data-aware. This event is typically used to make sure the control reflects the current field values in the dataset, because it is triggered by all changes.
Methods that can trigger this event include the Next or Prior methods for the dataset. Data-aware controls notify a data source of a data change when:
Scrolling to a new record.
Modifications to a field抯 data.
The Field parameter is nil if the change can affect more than one field value (for example when moving to a new record or refreshing a record buffer). If only one field is affected, Field indicates the edited field.
表达感谢有很多英语运用方式：1.Thank you.谢谢作为最普遍的表达感谢的语句，与此相同的意思表达为Thanks。2.Thank you very much.非常感谢在Thank you 后面加上程度词，表达了对对方的感激程度之深，此外还有：Thanks a lot 非常感谢；Thank you so much 非常感谢;Thanks a bundle 非常感谢”a bundle”常作为量词，为