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By the end of this chapter you will be able to:

  • Use the switch() function
  • Use the forEach() function

Using switch() to apply multiple tests

  • Create a new model: Attribute Scripting
  • Drag the datasource CRM onto this model
  • From the datasource open the schema browser, find the table SOURCE_BANK_ACCOUNT_TRANS and create a database collector from it
  • Create a stream from this database collector – remember to use the  button in the hover menu so that the stream attributes are automatically configured
  • Open the help for the switch() function:
    • Open the section - Attribute Functions in the repository browser – a list of all attribute functions available in PhixFlow will appear
    • Double click on the entry for switch to bring up the help page
  • Add an attribute to this stream to hold a description of the transaction type:
    • Name: TransactionTypeDesc

    • Expression: work out the transaction type description from TRANSACTION_TYPE, using a switch() statement, according to the rules below – use the examples in the help for switch() to get started

      TRANSACTION_TYPE

      Description

      1

      "Direct Debit"

      2

      "Standing Order"

      3

      "ePayment"

      4

      "Cheque"

      Any other value

      "Unknown"

  • Run the stream and check that your translation of transaction type to transaction type description is correct

Using forEach() to handle lists

  • Create an aggregate stream, with name Bank Account Summary
  • Add a pipe from the stream you created in the previous exercise (this is probably called SOURCE_BANK_ACCOUNT_TRANS) to Bank Account Summary
  • Add to the pipe the grouping:
    • ACCOUNT_NUM
  • Drag the attribute ACCOUNT_NUM into Bank Account Summary from either the pipe or the input stream
  • Add an attribute:
    • Name: TotalPosTrans
    • Type: Float
    • Expression: using a forEach loop, add up the total of all positive transactions, and store it in this attribute
  • Run Bank Account Summary to test this new attribute
  • When this is working, update TotalPosTrans to also calculate the total of negative transactions, and the total of all transactions – and hold them in local variables ($variables)
  • Add two further attributes – TotalNegTrans and TotalTrans - use these to store the values of all negative transactions and all transactions that you calculated in TotalPosTrans
  • Run Bank Account Summary again to test the new attributes

By the end of this chapter you will be able to:

  • Use the switch() function
  • Use the forEach() function
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