Hi,
smu johnson wrote:
With a Roll-your-own index open, when you use a dbgoto(), the record
pointer is moved to the correct row in the table but the pointer in the
index file is not positioned to the corresponding row, even though the
record is in the index. With a regular cdx index, the index pointer is
always positioned after a dbgoto().
Perhaps the reason for not positioning the index pointer in an ryo index
is that an ryo index can contain multiple entries for a single table
row, and as such, positioning the index pointer would be ambiguous
action (pick one?) and could therefore cause unpredictable results. Am
I correct in that thinking?
DBF can be positioned by record number. Index can be positioned by key
value. Since in RYO indices keyvalue could not be calculated using
record data, index can not be positioned. You can think that DBGOTO()
call also executes DBSEEK(&(ORDKEY())) to position index. In case of
RYO, ORDKEY() has no meaning.
Regards,
Mindaugas
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