FAQ's - APPX Software, Inc.: Is there a way to set child constraints on a data lookup field in an Input Process?

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Is there a way to set child constraints on a data lookup field in an Input Process?

You can constrain the scan list by creating a cached version of the file you want to do the data lookup on an populating it with only the records that meet your criteria. Create the cached file with NOLOAD, then once you have a PCF record use a begin at/end at contraint to read the records from the disk file and write them to the cached file. You will have to OPEN each instance of the file before the reads and writes. Something like this:

 SCRATCH APP FILENAME FAIL 0 CACHE? Y
 CREATE APP FILENAME SHARE? Y FAIL 0 CACHE NOLOAD
 OPEN APP FILENAME SHARE? Y FAIL 0 CACHE? N (for disk version)

 Then to populate:

 BEG AT APP FILENAME IN some constraint
 END AT APP FILENAME IN some constraint
 BEG READ APP FILENAME HOLD 0 KEY IS FILENAME KEY FIELD
 OPEN APP FILENAME SHARE? Y FAIL 0 CACHE? Y (for cached version)
 WRITE APP FILENAME
 OPEN APP FILENAME SHARE? Y FAIL 0 CACHE? N (for disk version)
 END READ APP FILENAME
 OPEN APP FILENAME SHARE? Y FAIL 0 CACHE? Y (so process will use
 cached version)

 Now the data lookup should work on the cached file.

 You could also build a memory file and do the same thing and have the data
 lookup work on the memory file.

2005-Jul-06 8:36am

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