Oops. That should be cond = db(db.mytable.id==someid).select(db.mytable.id)
On 22 January 2014 13:50, Johann Spies <johann.sp...@gmail.com> wrote: > cond = db.mytable(id=someid).select(db.mytable.id) > > Regards > Johann > > > On 22 January 2014 10:50, Jayadevan M <maymala.jayade...@gmail.com> wrote: > >> I am checking for existence of record in a table >> >> cond = db.mytable(id=someid) >> if not cond : >> do something >> >> This works fine. The query executed selects *all* columns and adds LIMIT >> 1 OFFSET 0; The LIMIT and OFFSET are OK. Since I want to just check for >> existence of a record, how can I rewrite this so that we have only the id >> column selected? I am trying to avoid a table scan and have just an index >> scan. >> >> -- >> Resources: >> - http://web2py.com >> - http://web2py.com/book (Documentation) >> - http://github.com/web2py/web2py (Source code) >> - https://code.google.com/p/web2py/issues/list (Report Issues) >> --- >> You received this message because you are subscribed to the Google Groups >> "web2py-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to web2py+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > > -- > Because experiencing your loyal love is better than life itself, > my lips will praise you. (Psalm 63:3) > -- Because experiencing your loyal love is better than life itself, my lips will praise you. (Psalm 63:3) -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
