Data Validation Foundation Class
This class traps for data conflicts on buffered data.
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
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 conflicts1 = check for conflicts and verify changes. nReturn specifies the action taken: 0 = No Change 1 = Successful Change 2 = Unable to make change |
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
Concepts
Guidelines for Using Visual FoxPro Foundation Classes
Reference
Visual FoxPro Foundation Classes A-Z