Step Last (34)

The Step Last operation (B_STEP_LAST) retrieves the last physical record of the file. The transactional interface does not use a key path to retrieve the record.

Parameters


	Op Code	Pos Block	Data Buf	Data Buf Len	Key Buffer	Key Number
Sent
Returned

Prerequisites

The file must be open.

Procedure

Set the Operation Code to 34. Optionally, you can include a lock bias:

+100-Single wait record lock.

+200-Single no-wait record lock.

+300-Multiple wait record lock.

+400-Multiple no-wait record lock.

For more information about locking, refer to the Pervasive PSQL Programmer's Guide.

Pass the Position Block for the file.

Set the Data Buffer Length to a value greater than or equal to the length of the record to retrieve.

Result

If the Step Last operation is successful, the transactional interface returns the file's last physical record in the Data Buffer and sets the Data Buffer Length parameter to the number of bytes returned.

If the Step Last operation is unsuccessful, the transactional interface may return one of the following status codes:


3	The file is not open.
9	The operation encountered the end-of-file. (when the file is empty)
22	The data buffer parameter is too short.

Positioning

The Step Last operation destroys logical currency. Step Last sets the physical currency using the retrieved record as the current physical record. The next physical position points beyond the end of the file.