Can you programatically change the Where clause of a Query Layer activity?

Chris Dunlop

18. November 2019 21:56

I have a form with 5 dropdown boxes that let the user select a feature based on 5 different attributes. I'd like to be able to use just one Query Layer activity to take the picked value from any of the 5 dropbown boxes, and build the Where clause using it. Is there a way of doing this? I don't want to have to do 5 separate queries...

 

Thanks!

Chris

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  Berend Veldkamp

  19. November 2019 14:00

  Sure, the where property would be something like this:

  =`field1='${ $form1.state.textBox1.value }' AND field2='${ $form1.state.textBox2.value }'`

  which results in

  field1='hello' AND field2='world'

   

  If one of the values contain single quotes, you will have to replace those with siongle quotes

   

   

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  Chris Dunlop

  20. November 2019 00:23

  Thanks for the help Berend. My case is slightly different, as the user can only select from one dropdown (the others are reset as soon as a value is picked). However, I was able to solve it as follows:

   

  • Added a Create Value activity called valueWhereClause to hold the value of the Where clause
  • added a series of IF activities to figure out which dropdown was populated
  • after each IF activity, used an Evaluate Expression to set the value of the valueWhereClause based on the appropriate attribute
  • Each If statement then points to a common Query Layer activity. Its Where clause is set to =$valueWhereClause.result

   

  Other than the inelegance of multiple IF activities, it does everything using a single Query Layer activity, so I'm happy.

   

  Thanks for your help. It gave me some ideas.

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