Re: Sharing an ADO connection object between two processes ?
"Herby" <prmarjoram@gmail.com> wrote in message
news:1159787801.059081.89760@m73g2000cwd.googlegroups.com...
We have a client and server application that run on the same machine.
We want both to participate in the same transaction.
To acheive this I understand they need to share the same connection
object.
The server currently supports a COM interface, as the client passes
across copies of simple data types Strings and integers etc.
But now they want to pass across the client ADO connection object. The
data-writes within the server should then use this connection object
for creating its recordsets etc.
On return to the client - the client may then decide to commit or
rollback via the same connection object.
I understand the server would have a proxy back to the actual
connection object residing in the client address space. Is this going
to work?
No offense intended but this is impossible. A connection, is in fact a
TCP/IP connection (for instance) to a SQL database server.
As you might guess, a single process can host one or more TCP/IP
connections, but one connection belongs _exactly_ to one
process.
As soon as you 'share' the connection, you are fooling yourself to think
that you have just one connection. You will have two connection in addition,
there -will- be a lot of marshalling at the runtime of COM.
It's much more performance and security wise, to -not- share connection
objects. Just rely on the perfect resource pooling features of Windows.
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