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reading adabas file without descriptor

 
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vinuseba

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Joined: 17 Feb 2014
Posts: 19
Location: India

PostPosted: Wed Feb 25, 2015 3:28 pm    Post subject: reading adabas file without descriptor
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How can i read adabas from natural program with a condition in non descriptor field?
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Ralph Zbrog

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Joined: 21 Nov 2009
Posts: 58
Location: California

PostPosted: Thu Feb 26, 2015 2:23 am    Post subject: Reply to: reading adabas file without descriptor
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If this is the only condition to be tested, then you must retrieve every record in the file and apply the condition.
Code:
READ file PHYSICAL
  IF  field-name <> 'value'
    THEN
      ESCAPE TOP
  END-IF

Code:
READ file PHYSICAL
  ACCEPT IF  field-name = 'value'

Code:
READ file PHYSICAL
  WHERE field-name = 'value'


WHERE is more efficient than ACCEPT which is more efficient than IF.

If your DBA allows it (highly unlikely - I wouldn't recommend it), the field could be defined in the DDM for non-descriptor searches. In this case Adabas would read every record in the file, but return only those that satisfy the condition.
Code:
READ file BY field-name FROM 'value' TO value'

The best scenario would see a descriptor range narrow the number of records to be retrieved, then apply the condition.

Code:
READ file BY de FROM 'RALPH' TO 'ZBROG'
  WHERE field-name = 'value'

Code:
FIND file WITH de = 'RALPH' THRU 'ZBROG'
  WHERE field-name = 'value'
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