FairCom ISAM for C

Batch Update Operations: BAT_UPD and BAT_UPD_KEY

The batch update call to DoBatchXtd() (short name BATSETX) is formatted as follows:

BATSETX(keyno,request,NULL,bufsiz,mode)

Where the parameters are:

• keyno - Index file number of a unique index associated with the target data file
• request –
  • Input buffer comprised of 5 LONG integers followed by the record entries as described above. On input, ((pLONG)request)[2] holds the number of entries.
  • Output buffer comprised of 5 LONG integers:

  0) successful rewrites

  1) successful adds

  2) reserved for future use

  3) in case of error, offset into the input buffer for the entry causing the error (zero offset is just after the 5 LONG integers)

  4) a 32-bit status word that indicates what operation failed (see BAT_STT_XXXX in ctport.h):

Symbolic name	Value	Description
BAT_STT_UPDATE	0x00000001	error on rewrite
BAT_STT_ADD	0x00000002	error on insertion
BAT_STT_DELETE	0x00000004	error on delete
BAT_STT_REDIREC	0x00000008	error on reading old record
BAT_STT_EQLKEY	0x00000010	error on equal key
BAT_STT_BUFSIZ	0x00000020	record image area too small
BAT_STT_FRMKEY	0x00000040	error assembling or transforming unique key value
BAT_STT_GTVLEN	0x00000080	error on get var rec length
BAT_STT_GETMEM	0x00000100	error allocating record buf
BAT_STT_CONVERT	0x00000200	error converting rec image

• bufsiz - Size of the input buffer region that follows the 5 LONG integers
• mode - BAT_UPD or (BAT_UPD | BAT_UPD_KEY).

Error Handling

BATSETX() returns an error code or NO_ERROR. This operation will stop if an error occurs. In case of an error, the number of successful Updates and ADDs are returned in elements 0 and 1 of the request output buffer as described above.

Because the operation stops on the first record that fails, adding the number of Updates and number of ADDs gives you the record number that failed.

Transaction Control - If an error occurs when the files are transaction controlled, none of the successful updates will be committed since BAT_UPD starts a transaction if one is not active or a save point if a transaction is active. In the event of an error, it either aborts the transaction or restores to the save point. For files that are not transaction controlled, the successful updates survive the error.

Status Word Zero - If an error code is returned and the status word is zero, the error occurred during the setup of the BAT_UPD and no attempts were made to update any records.

Limitations

See Heterogeneous support for BAT_INS and BAT_UPD.