On Oct 4, 2010, at 8:30 PM, Michael Bayer wrote: > > On Oct 4, 2010, at 8:06 PM, Mark Erbaugh wrote: > >> >> Thanks. What is the purpose of >> >>>> SELECT period.realperiod AS period_realperiod >>>> FROM period >>>> WHERE period.cycle = ? >> >> that appears to be generated by the session.query ... call? > > the delete() and update() methods on Query want to invalidate all objects > currently in the session which match the criterion. There are three options > for this behavior, and in 0.5 the default is "fetch" which is what that > appears to be doing. I would set it to "evaluate" so that it only scans > through memory instead of hitting the DB, or None so that it doesn't > invalidate anything, if you aren't concerned about coming across those > objects in the same transaction. >
That makes sense. Thanks, Mark -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
