Reference Table with Dynamic Validation

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Revision as of 07:56, 24 May 2009 by Red1 (Talk) (Case Study)

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Case Study

  • We are doing this as a prototype for an E-ticketing system.
  • We are going to create a Reference to a Table in the database.
  • The Reference are created for the field ET_TripBegin (Origins) and ET_TripEnd (Destinations) from table ET_Booking. They will access the Table called ET_Vehicle that is a holder of available routes or schedule trips.

Steps

ReferenceTable1.png

  • The ET_TripBegin field Reference is set to Table instead of String. A new Reference 'Departures' is created. You can do that on the fly by right-clicking on it and select Zoom.

ReferenceTable1Validation.png

  • The table is selected here and the field chosen is the ET_Departure which becomes distinct origins during pull down.
  • You can see the result from the following screen.

PulldownReference.png

  • It shows all the available origins that the user can choose from.
  • Now we shall do the same for the other field which concerns destinations or arrivals.

ReferenceTable2.png

  • This second field ET_TripEnd will refer the same table. Note that it has an extra duty under Dynamic Validation.

ReferenceTable2Validation.png

  • The pull down will show all the arrivals. But we do not want all of them. We just want those that correspond to the origin.

DynamicValidation.png

  • Dynamic Validation allows for SQL injection, where we supply the WHERE clause.
  • Here we ask it to access the ET_Vehicle table for records similar to the origin by ensuring similar ET_Departure values.
  • @..@ traps the field value in play. We place it within single quotes '@..@' for SQL to take it as a string value.