Data Validation Foundation Class
| Category | Data Editing |
|---|---|
| Default Catalog | Visual FoxPro Catalog\Foundation Classes\Data Query |
| Class | _datachecker |
| Base Class | Custom |
| Class Library | _datanav.vcx |
| Parent Class | _custom |
| Sample | ...\Samples\Solution\Ffc\conflicts.scx |
Remarks
This class traps for data conflicts on buffered data.
To use, drop the class on a project or form or, from the Component Gallery Item Shortcut Menu, select Add to Project or Add to Form. When you add the class to a form, you need to specify the appropriate property values. When you drop the class on a project, you can choose between adding the class or creating a subclass.
See Guidelines for Using Visual FoxPro Foundation Classes for more information on using foundation classes.
| Properties, Events, Methods | Description |
| HandleRecord method | Compares the current value, old value, and original value on disk of each field, displaying a message box if a change or conflict is detected. Syntax: HandleRecord(lnScope) Return:nReturn Arguments: lnScope specifies the degree of validation: 0 = check for conflicts |
| String method | Called by the HandleRecord method, returns a character equivalent of the passed value. Returns only a notification for memo fields. Syntax: String(luValue) Return: none Arguments: luValue specifies the value to be checked. |
| VerifyChanges method | Prompts a user to save all changes made to a table or record. Syntax: VerifyChanges( ) Return: none Arguments: none |
| VerifyEachChange method | Prompts a user to confirm each change made. Syntax: VerifyEachChange( ) Return: none Arguments: none |
| CheckcConflicts method | Notifies a user when data has changed after record editing started. Syntax: CheckcConflicts( ) Return: none Arguments: none |
See Also
Guidelines for Using Visual FoxPro Foundation Classes | Visual FoxPro Foundation Classes A-Z | Visual FoxPro Foundation Classes