Hello all,
I'm experimenting with virtual tables and I must say that it's a very
nice feature to have, it saves me from inserting millions of records in
a database when I can simply map the source file in memory and read it
directly.
However, I have a small issue when renaming a database. What is
happening is the following:
xDisconnect
xRename
xConnect
Those calls are quite expected and fine by me.
However, what surprises me is that xConnect is given a zero ppVTab
parameter (that is, *ppVTab == 0)
I would have thought that since the disconnect was given a valid pVTab,
this one could have been given back to xConnect when reconnecting the
database after its rename.
As it turns out, I use pAux to point to my own structure, so I was able
to create a list of "dangling" databases to pick from when connecting.
That is to say, when xDisconnect is called, the database is put in that
list of "dangling" databases and using the name in xConnect, its value
is retrieved at that time.
I know that the documentation says that xConnect and xCreate can be the
same, and that most implementation that I have seen are actually the
same, but when they are not, the current situation makes it difficult
(at first sight) not to call again lengthy code when *ppVTab is zero.
Is this behavior expected? I'm fine with my current solution, but I was
expecting xConnect to get a non zero *pPVTab most, if not all the time.
Thanks in advance for any clarification on this subject.
Regards
Olivier
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