Dennis, After your explanation the prefixing doesn't look so bad.
The client might do lots of queries before it exits. But I can drop that temp table when client does finalize. I have to have a state machine for clients so they don't crash the server by misusing the API anyways. Thank you! -Alex On Wed, Jun 11, 2008 at 9:36 AM, Dennis Cote <[EMAIL PROTECTED]> wrote: > Alex Katebi wrote: > > However there are two things I don't like about this method. One is that > I > > need to parse the prepared statments and prefix queries, and replace the > > table name with the temp table name in the surrogate query. Two is that > if > > the client does lots of queries before disconnecting from the server it > > can waste whole lot of memory. Three is that it is a hack. > > > > Alex, > > There should be no need to parse the queries other than to check for > "select" at the beginning to identify it as a select statement. All > select statements would be prefixed with the same prefix string, "create > tmp.result as", regardless of the complexity of the original query. You > are simply storing the result set of the query into a temp table. > > Since the temporary result table is always the same, the surrogate query > is always the same, "select * from from tmp.result". There is no need to > replace any table names. > > I imagined the temporary memory database would be closed, and hence its > memory released, after each query completes. The memory footprint > wouldn't grow with each query, it would be the same as that required for > the query with the largest result set. > > It is not a hack of any sort. It simply uses the public APIs to quickly > copy the result data into a private table to avoid locking the entire > database while those results are slowly scanned by a client. > > Dennis Cote > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
