Monday 26 November 2012

How to Separate Header and Footer from Flat file

Informatica Scenario:To load the Header records into one target table, say TRGT01, footer records to TRGT02 and detail records to another TRGT03

Source File
Header”ABC”
@@@@@@@@@@@@

Detail”123”
Detail”456”
Detail”789”
Detail”012”

@@@@@@@@@@@@
Footer”Efg”

1.Create Source definition for the file and connect to an Expression

2.In Expression create two variable ports
  • V_HEADER= IIF (SUBSTR(COLUMN,1,1)=’Header’,1,0)
  • V_FOOTER= IIF (SUBSTR(COLUMN,1,1)= ‘Footer’,1,0)
Also create two output ports
  • O_HEADER=V_HEADER
  • O_FOOTER=V_FOOTER

3.Create a Router with two user groups
  • In first group give condition such that IIF(O_HEADER)='1' then pass to TRGT01
  • In second group IIF(O_FOOTER)='1' then pass to TRGT02
  • And the default group to TRGT3(this will hold the detail records)

Note: One more option is to use the Header Options in the Session Properties

1 comment:

  1. The simplest way would be to test the value of COLUMN in the group expressions of the router, e.g.

    UPPER( COLUMN ) ='HEADER'

    It might be marginally more efficient to use a DECODE in an expression before the router to set a numeric control port that you use in the router group expressions.
    I would also abstract the values in mapping parameters, e.g.

    1. define three interger parameters:

    p_row_type_header=0
    p_row_type_detail=1
    p_row_type_footer=2

    2. define an output expression

    o_row_type=DECODE( UPPER( COLUMN )
    , 'DETAIL', p_row_type_detail
    , 'HEADER', p_row_type_header
    , 'FOOTER', p_row_type_footer
    , ABORT( 'unexpected column value [' ||COLUMN ||']'
    )


    3. define each router group expressions using the row_type and the parameters, e.g.

    HEADER: i_row_type=p_row_type_header

    ReplyDelete

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