Oracle Forms : Coding ..
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Flexible coding in forms allows developers to write reusable and maintainable code by avoiding hard-coded object names. This is done through the use of system variables that reference the current cursor object, and built-in functions that get and set object properties and find an object's internal ID at runtime. Object IDs can then be stored in variables and used to reference objects within a code block instead of their names. This makes the code more flexible and generic.
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- 1. Flexible Coding in Forms http://ebiztechnics.blogspot.com
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- 3. Flexible Coding • What do you mean by Flexible Coding? • Is generic code • Is reusable • Avoid hard coded object names • Make maintenance easier • Increases Productivity http://ebiztechnics.blogspot.com
- 4. System Variables • Input focus: – SYSTEM.CURSOR_BLOCK – SYSTEM.CURSOR_RECORD – SYSTEM.CURSOR_ITEM – SYSTEM.CURSOR_VALUE http://ebiztechnics.blogspot.com
- 5. System Variables • Trigger focus: – SYSTEM.TRIGGER_BLOCK – SYSTEM.TRIGGER_RECORD – SYSTEM.TRIGGER_ITEM Note: prefix colon (:) before these variables Example: :SYSTEM.CURSOR_ITEM http://ebiztechnics.blogspot.com
- 6. Examples • IF :SYSTEM.CURSOR_BLOCK=‘DEPT’ THEN GO_BLOCK(‘EMP’); ELSIF :SYSTEM.CURSOR_BLOCK=‘EMP’ THEN GO_BLOCK(‘SALGRADE’); ELSIF :SYSTEM.CURSOR_BLOCK=‘SALGRADE’ THEN GO_BLOCK(‘DEPT’); END IF; http://ebiztechnics.blogspot.com
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- 8. SET_”object”_PROPERTY Built-ins • SET_APPLICATION_PROPERTY • SET_FORM_PROPERTY • SET_BLOCK_PROPERTY • SET_RELATION_PROPERTY • SET_RECORD_PROPERTY • SET_ITEM_PROPERTY • SET_ITEM_INSTANCE_PROPERTY • SET_LOV_PROPERTY • SET_RADIO_BUTTON_PROPERTY • SET_MENU_ITEM_PROPERTY • SET_CANVAS_PROPERTY • SET_TAB_PAGE_PROPERTY • SET_VIEW_PROPERTY • SET_WINDOW_PROPERTY http://ebiztechnics.blogspot.com
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- 10. FIND_ Built-ins • FIND_FORM FORMMODULE • FIND_BLOCK BLOCK • FIND_ITEM ITEM • FIND_RELATION RELATION • FIND_LOV LOV • FIND_WINDOW WINDOW • FIND_VIEW VIEW • FIND_CANVAS CANVAS • FIND_ALERT ALERT • FIND_EDITOR EDITOR http://ebiztechnics.blogspot.com
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- 14. Summary • User System Variables – To avoid hard coded object names – Make maintenance easier • Use GET_”object”_PROPERTY Built-ins to get and SET_”object”_PROPERTY Built-ins to Set the object properties at run time. • Use FIND_”object” functions to find the internal Object Ids. http://ebiztechnics.blogspot.com
Editor's Notes
- #5: Note: The best way to learn about system variables is to look at their values when a Form is running. You can examine the system variables by using the Debugger.
- #12: Note: Use the FIND_ built-in subprograms only when referring to an object more than once in the Same trigger or PL/SQL program unit.