Oracle Forms: Master Detail form
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Oracle Master detail Forms
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Oracle Forms: Master Detail form
- 1. Controlling Data Block Relationships http://ebiztechnics.blogspot.com
- 2. Objectives • Define block coordination • Coordinate data blocks by using REF relations • Describe the characteristics and principles of relation-handling code • System Variables for obtaining relation handling information • Implement a coordination-type toggle • Force one commit per master record http://ebiztechnics.blogspot.com
- 3. Relations • Logical objects that handle the relationship between two blocks • Created implicitly with a master-detail form module • Created explicitly with the New Relation dialog box http://ebiztechnics.blogspot.com
- 4. Block Coordination • Coordination-causing event • Block-coordination phases: – Clear phase executed before change of master record – Populate phase executed after change of master record • Implementation of block coordination: – The Copy Value from Item property – Relation-handling triggers – Relation-handling procedures http://ebiztechnics.blogspot.com
- 6. Characteristics of Relation-Handling Triggers • On-Clear-Details: Implements the Clear phase • On-Populate-Details: Implements the Populate phase • On-Check-Delete-Master: Implements the restricted-delete rule • Effect of trigger failure http://ebiztechnics.blogspot.com
- 7. Principles of Relation-Handling Code Three relation-handling procedures: • CLEAR_ALL_MASTER_DETAILS • QUERY_MASTER_DETAILS • CHECK_PACKAGE_FAILURE Adding your own code to relation-handling triggers: • Forms adds comments around code. • You add your own code before or after these comments. http://ebiztechnics.blogspot.com
- 8. Obtaining Relation-Handling Information System variables for relation handling: • SYSTEM.MASTER_BLOCK • SYSTEM.COORDINATION_OPERATION Built-ins for relation handling: • GET_FORM_PROPERTY • GET/SET_BLOCK_PROPERTY • GET/SET _RELATION_PROPERTY http://ebiztechnics.blogspot.com
- 9. Implementing Coordination-Type Toggle Define a procedure that toggles between immediate and deferred coordination • Use GET_BLOCK_PROPERTY to obtain relation name. • Use GET_RELATION_PROPERTY to obtain current coordination type. • Use SET_RELATION_PROPERTY to switch to other coordination type. Call this procedure from: • When-Checkbox-Changed trigger • Menu item of type Check http://ebiztechnics.blogspot.com
- 10. Forcing a Commit Per Master Define a procedure that: • Updates the commit status by performing validation • Checks the commit status of the master record • Raises FORM_TRIGGER_FAILURE in case of changes Call the procedure: • In the On-Clear-Details trigger • Before the “Begin default relation program section” comment http://ebiztechnics.blogspot.com
- 11. Summary • Define Relation coordination properties • Manage data block coordination – Coordination-causing events change the master record – Clear and populate • System Variables for obtaining relation handling information http://ebiztechnics.blogspot.com
Editor's Notes
- Technical Note If you specify a cascade-delete foreign key rule for a relation. Form Builder uses a Pre-Delete trigger to implement this rule. However, This is a commit trigger. Not a relation-handling trigger, and can also Be used outside the context of relations.
- Technical Note You can use these system variables in the On-Clear-Details trigger only. Assign their values to global variables to broaden the scope.