No worries, just checking. We'll simply not support them for H2 on our side.
Thanks for your responses, Lukas 2014-06-05 18:52 GMT+02:00 Thomas Mueller <[email protected]>: > Hi, > > Yes, support for recursive queries in H2 is very very limited. All > limitations should be documented. Right now improving support is not a high > priority for me, sorry. > > Regards, > Thomas > > > > On Tuesday, June 3, 2014, Lukas Eder <[email protected]> wrote: > >> Hello, >> >> We're currently integrating support for CTE in jOOQ and we're wondering >> if we should support CTE for H2 at all. H2 has experimental CTE support, if >> I'm not mistaken: >> >> http://www.h2database.com/html/advanced.html?highlight=recursive&search=recursive#recursive_queries >> >> This would be one of our test cases, and it seems to work for H2: >> >> with recursive "t1"("f1", "f2") as ( >> select >> 1, >> 'a' >> from dual >> union all >> select >> ("t1"."f1" + 1), >> ("t1"."f2" || 'a') >> from "t1" >> where "t1"."f1" < 10 >> ) >> select >> "t1"."f1", >> "t1"."f2" >> from "t1" >> >> >> However, in standard SQL, I can declare several tables in the WITH >> clause, e.g.: >> >> with recursive "t1"("f1", "f2") as (...), >> >> "t2"("g1", "g2") as (...), >> ... >> >> select ... >> >> >> This doesn't seem to work right now for H2. >> >> Am I right in thinking that: >> >> 1. Only RECURSIVE CTE are currently supported, although I can tweak a >> synthetic UNION ALL clause into the query to make H2 believe that we have >> the required syntax (see below) >> 2. The RECURSIVE keyword seems to be optional - probably to be Oracle >> compatible as in Oracle, recursiveness is implicit >> 3. Only single-table CTE are currently supported >> 4. This is currently still not a priority for the H2 maintenance team? >> (as this question occasionally pops up on the user-group) :-) >> >> [From 1] Non-recursive tweak to comply with H2 syntax requirements: >> >> with "t1"("f1", "f2") as ( >> select >> 1, >> 'a' >> from dual >> union all >> select null, null >> where false >> ) >> select >> "t1"."f1", >> "t1"."f2" >> from "t1" >> >> >> Any feedback is very welcome. >> >> Cheers >> Lukas >> >> -- >> You received this message because you are subscribed to the Google Groups >> "H2 Database" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/h2-database. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "H2 Database" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/h2-database/O-CqOve05RM/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/h2-database. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/h2-database. For more options, visit https://groups.google.com/d/optout.
