On 3 June 2011 05:35, Kevin Quick
Dmitry,
I'm not directly familiar with Takusen or its use with OracleDB, but I would hazard a guess that the withSession is doing FFI resource management and that resources obtained inside the withSession environment are no longer valid outside of the withSession.
If this is the case then I would expect the following to work:
replicateM 2 (do withSession (connect "x" "x" "x") (do res <- doQuery ... liftIO $ print res ) )
If this really is the case then it seems that withSession shouldn't be exporting FFI-based resources.
-KQ
You're right, withSession shouldn't be exporting FFI obtained resources, and I don't think it does. There are some known issues with the Oracle code, where it allows buffers to fall out of reference (and thus be gc'd) before the C libs have finished with them, thereby causing segfaults. The known problems are around bind variable buffers, so this looks like a new issue. At least we're collecting a nice corpus of programs that cause the Oracle backend to fail :-) I'd love to have more time to work on it... If you don't need the Oracle-specific functionality, for now I suggest using the ODBC driver as a substitute, as this seems to be (more) reliable. Alistair