Evaluation Sequence in Transformer Stage - A Quick DataStage Recipe

Recipe:

What is evaluation sequence in Transformer Stage Or Order of Stage & Loop Variable and Derivations

Ingredients:

1. Transformer Stage

     a. Stage Variables

     b. Loop Variables

     c. Derivations

How To:

Evaluate each stage variable initial value
For each input row to process:
Evaluate each stage variable derivation value, unless the derivation is empty
For each output link:
Evaluate each column derivation value
Write the output record
Next output link
Next input row

** The stage variables and the columns within a link are evaluated in the order in which they are displayed in the Transformer editor. Similarly, the output links are also evaluated in the order in which they are displayed

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UpCase and DownCase String Function : DataStage Transformation

Downcase(column):
                  This function converts all the input character to LOWER case where input can be in any case.

input = 'This is me'
input1 = 'this is me'
input2 = 'THIS IS ME'

DownCase(input)    =  'this is me'
DownCase(input1)   =  'this is me'
DownCase(input2)   =  'this is me'

Upcase(column): 
                  This function converts all the input character to UPPER case where input can be in any case.

input = 'This is upper case function'
input1 = 'this is me'
input2 = 'THIS IS ME'

UpCase(input)    =  'THIS IS UPPER CASE FUNCTION'
UpCase(input1)   =  'THIS IS ME'
UpCase(input2)   =  'THIS IS ME'

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Left and Right String Function - DataStage Transformation

Today, we will discuss two more datastage transformer functions - Left & Right.  These two functions use to get or cut the string from the input data, Let's have a look -


Left(input, number)  
input : - input column
number :- the no of characters you want to fetch from Left most of string

input = 'This is a test of fuctions."

Left(input,9)  =    'This is a'
Left(input, 3) =    'Thi'

Right(input, number)
input : - input column
number :- the no of characters you want to fetch from Right most of string

input = 'This is a test of fuctions."

Right(input,9)  =    'fuctions.'
Right(input, 14) =    't of fuctions.'

Use of Left/Right function to get SubString -

These functions used to get substring from an input if the start and end character location known or can be derived. Let's see an example -

we need to cut input from 2nd to 6th character

input = 'This is a test of fuctions."

left(input, 6) = 'This i'           #left function cut the left 6 character

Right(left(input,5),5) = 'his i'    #Use right func, to cut right 6-2+1 = 5 char 

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