Download Effective Techniques for Application Development with Visual by Jim Booth, Steve Sawyer, Steve Dingle PDF

By Jim Booth, Steve Sawyer, Steve Dingle

Veterans consultant clients via industrial-strength program improvement with visible FoxPro.

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Extra resources for Effective Techniques for Application Development with Visual FoxPro 6.0

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There is an assign method associated with the uKeyValue property. This method calls the form s Requery() method. The code for the uKeyValue_Assign and the Requery() method are shown in Listing 5-12. Listing 5-12 . The uKeyValue_Assign() and Requery() methods. Refresh() As you can see from Listing 5-12, four lines of code take the form s uKeyValue property (which is a primary key value for the Time_Cards table, and a foreign key value for the Time_Card_Hours table) and retrieve the corresponding records from each table by calling the REQUERY() function for each view, then refreshing the form.

Init() The Init() event method is set up to accept an argument containing a reference to an application object, and to pass this object reference to the basic form class from which cDMForm is subclassed. More important to this example is the call to the classes BuildCursorArray() method. BuildCursorArray() In order to write reusable code to manipulate the cursors that may be opened by a form, it is necessary to maintain a list of the cursors with which we need to be concerned. This means that when checking for changes to data, saving changes to data, discarding changes to data, and so on, we need to concern ourselves with a subset of all tables and views that might be open while a form is running.

You can immediately tell that they re views because they all begin with "v_", my naming convention for views. You ll notice that two of the views end with the letters "RO". F. These views are present only for the purpose of populating two drop-down lists. v_EmployeeListRO supports a drop-down list (actually, two cboEmployeeLookup and cboEmployee), and v_Time_Cards_ByEmpID_RO supports another cboTimeCards. The v_EmployeeListRO view is not parameterized. It simply pulls up a list of employee names (a virtual field concatenating first and last names) along with their last names (for sorting purposes), their employee number and their surrogate employee ID values.

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