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Status Not under consideration
Workspace IBM i
Categories Languages - Other
Created by Guest
Created on Apr 18, 2017

C API _Rlocate add ability to use key other than string

_Rlocate only accepts a string as the key to use for search. For files which are keyed by other variables (INT etc) the locate does not find the required record.

Use Case:

_Rlocate on a file with a keyed access path which is an integer does not return a record even though the file has a key which matches the request.

Idea priority High
  • Guest
    Apr 20, 2017

    Based on the comments from the community (thank you all BTW!!) Looks like this RFE can be closed as the support is already available. Please chime in if you disagree.

  • Guest
    Apr 19, 2017

    Previous comment should read _Rreadk() not _Rread.

  • Guest
    Apr 19, 2017

    Previous comment should read _Rreadk() not _Rread.

  • Guest
    Apr 19, 2017

    Based on my findings I am not sure if this an RFE or a PMR? _Rlocate should be capable of using a partial key (is a long int stored in a long long int field a partial?), I know it works on partial keys within character based fields. I tested the retrieval of the same keyed record in SQL by doing a "select from file where key = 1234..." and the record was correctly located. so why would SQL return the record and a _Rlocate not? Also tried with _Rread with the same results.

  • Guest
    Apr 19, 2017

    Sorry, I was testing a program and the results would not find the correct key value because the record field was capable of holding a larger value than I was writing to it, subsequent requests for the record using the key written failed. I created the file with a key field of 16B and wrote a long int to the key field, the subsequent rlocate using a long int value failed to locate the record! I reduced the field to a 8B storage location and the write/rlocate of the key works. However if I was using a string and wrote 10 characters to a 20 character field with a subsequent rlocate with a key length of 10 it would find it. Also the manual states the the parameter passed to the _Rlocate function should be a string. " key
    Points to a string containing the key fields to be used for positioning." The header does state a void * which is why I thought an address of a long int should work, but testing as above failed.

  • Guest
    Apr 18, 2017

    This is already available. Keys are a "data structure" if you will, but regardless, you can pass the address of an int variable and simply cast it to whatever. The prototype is "void *" (void pointer) so any address is permitted.

    int custno = 3741;
    _Rlocate(hFile, &custno, sizeof(custno) );

  • Guest
    Apr 18, 2017

    The C prototype as supplied in QSYSINC/H.RECIO has type void * for the key, so is not restricted to being passed as a string.
    Use either a pointer to int or the address of the int or a pointer to a struct that contains an int or the address of the structure that contains an int..

    More generically we use either of the latter and the struct contains all key fields for the file and use the length of key argument to control whether doing full or partial (and how partial) key operation. This RFE is not needed IMHO.