2014/1/13 Bruce Momjian <[email protected]> > On Sun, Jan 12, 2014 at 07:00:09AM +0100, Pavel Stehule wrote: > > Comment updated. Patch attached. > > > > > > > > Still I am missing message about preferred syntax (or we should to > enhance GET > > DIAGNOSTICS doc about proprietary syntax). > > > > PL/pgSQL, PL/SQL is mix of two languages: ADA and SQL - and their > designers > > decided so embedded SQL statements will be placed in native SQL syntax > (and ADA > > in simplified ADA syntax) > > > > We have to find a agreement what we will prefer for PL/pgSQL: > > > > The assign statement is "ADA" statement - ":=" is preferred > > > > The GET DIAGNOSTICS is "SQL" statement - "=" is preferred > > > > A newer SQL/PSM was designed differently - without this dichotomy - A > > assignment is emphased by syntax SET varname = value > > > > A proper syntax is good information what is coming from - and It is good > mental > > helper to understand a philosophy of stored procedures (that shares > concepts > > with PL/SQL). Next argument is similarity with PL/SQL and SQL PL. This > > statement (GET DIAGNOSTICS) is supported on both environments and only > "=" is > > allowed there. > > I find the rules above so complex that I don't see how we can recommend > a best syntax. What I did in the patch I just posted was to put the > preferred operator first, but I don't see why we want to get into these > details in the docs. >
just a note about preferred variant should be ok. Using ':=' in GET DIAGNOSTICS statement is just bad idea. Pavel > > -- > Bruce Momjian <[email protected]> http://momjian.us > EnterpriseDB http://enterprisedb.com > > + Everyone has their own god. + >
