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     The record or set types specified with a keep lock must be locked in order
     to apply a keep lock; otherwise,status S_NOTLOCKED is returned.

     Within a transaction, a read-locked file can be upgrated to a write or
     exclusive lock without the possibility of outside intervention by calling
     d_lock with  a write or exclusive lock where a read lock already exists.
     If the upgrade lock request is denied, the lock will remain in effect.

     If any of the requested lock




















                                                   This function determines if the key for optional key FIELD in the current
   record has been stored.Status S_OKAY is returned if the key has been stored.
   Status S_NOTFOUND is returned if the key has not been stored.
   This function reads the optional key bit from the record header stored in
   the data file. Thus ,in shared access mode,the data file must be locked.

CURRENCY CHANGES
   None.

RETURN CODES

   0     S_OKAY         optional key value has been stored.

   2     S_NOTFOUND     Optional key value not stored.

  -5     S_INVFLD       Invalid field type.

   -24   S_NOTLOCKED    Data file containing current record is not locked.

   -37   S_NOTOPTKEY    Specified field type is not defined as an optional key.

   -38   S_BADFIELD     Specified field type not defined in current record.


EXAMPLE

    if (d_keyexist(EMP_ID)==S_NOTFOUND)
     {
      /* store employee id  */
     d_keystore(EMP_ID);
     }