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Additional resources for Effective Techniques for Application Development with Visual FoxPro 6.0
The Save() method. F. AfterFailedSave() ENDIF RETURN llSuccess uKeyValue property, uKeyValue_Assign() and Requery() methods 46 47 The vast majority of forms have a single key value that determines the set of records that are retrieved. A primary key value for a parent table is also the foreign key value for the child records. This value is often needed by various methods of the form; rather than passing it around as method arguments and storing it using local memory variables, it s much more convenient to store it to a form property.
VCX class library that is included in the CHAP5 project. 43 44 Listing 5-3 . The Cancel() method. F. REFRESH() Delete() The foundation classes used in this example are based on a production application currently in development. In the past, it has been my practice to leave this method empty in the foundation class, and write form-specific delete method code in the form instance. Thus far, in the application we re developing, the assumptions inherent in this foundation class code have stood up well.
SCX and opening the Data Sessions window, you can quickly see the tables and views that are in use by the form at runtime. You ll notice that the following views are not opened by the DataEnvironment: • v_SystemCodesRO • v_ProjectListRO Listing 5-8 shows the commands that create these two views (this is just for illustration; both views can be created in the View Designer). Listing 5-8 . Read-only views for project and system codes picklists. cdescription The drop-down-list picklists that use these views work a little differently than the two discussed above.