On Mon, 8 Sep 2003, Chris Gamache wrote: > I'm using sequences and currval() to retrieve the last inserted row in a table. > > > If currval() is undefined, as it is when a connection is made, then I know no > rows were inserted in that table and can take a different action. This is > problematic when using a connection pooling library, as the value of currval() > for any given sequence could possibly be set from a previous "connection". > > One (theoretical) workaround would be to issue some sort of command to the > back-end database to wipe all values of currval() when a "new" connection is > made. I've done some digging in the system tables and source code, and can't > find an obvious solution. Perhaps one you you gurus can suggest a SQL statement > to do such a thing. > > Alternately, if there is a better way to retrieve the last inserted row for any > given table, I'd be very grateful for the tip. It would need to be independent > of the connection history, and undefined if there has not been a row inserted > to the table during a definable interval of time (drop anchor when the > "connection" begins, raise anchor when the "connection" ends), and be > independant of the other connections inserting rows to the same table. > > Any idaeas?
Are you writing in java? If yes, then implementing a wrapper around Connection would be a way. > > CG > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site design software > http://sitebuilder.yahoo.com > > ---------------------------(end of broadcast)--------------------------- > TIP 9: the planner will ignore your desire to choose an index scan if your > joining column's datatypes do not match > -- ================================================================== Achilleus Mantzios S/W Engineer IT dept Dynacom Tankers Mngmt Nikis 4, Glyfada Athens 16610 Greece tel: +30-210-8981112 fax: +30-210-8981877 email: achill at matrix dot gatewaynet dot com mantzios at softlab dot ece dot ntua dot gr ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
