On Fri, 31 May 2019 at 11:49, <firebird-devel-requ...@lists.sourceforge.net> wrote:
> On 30.05.2019 18:09, Emil Totev wrote: > > I wonder would it be possible to make Firebird 4 work with ODS 12 > > (Firebird 3) databases? > > > > Before Firebird 3 it was relatively easy to upgrade your Firebird > > server - your databases could stay in the old ODS and be upgraded one > > by one, and it was easier to go back in case of incompatibilities. > > But when you upgrade the server to Firebird 3, you have to upgrade all > > its databases to the new ODS at the same time, and it is much harder > > to go back. I believe this holds the upgrade to Firebird 3 for many of > > us. > > > > Now with Firebird 4 the situation seems the same. I was hoping the new > > plugin architecture could help with this, so I copied an engine12.dll > > to the plugins directory of Firebird 4 beta, and added two lines in > > the respective databases.conf entry for the ODS 12 database: > > ? ? ?Providers = Engine12 > > ? ? ?SecurityDatabase = $(dir_secDb)/security4.fdb > > This made it possible to connect to the database, but every attempt to > > execute a statement ended up with 'Interface IStatement version too > > old: expected 4, found 3'. > > > > Would it be very difficult to provide version 4 compatible engine12.dll? > > Yes, we will ensure that engine12 works with FB4. That's great that you > have made this test, please register appropriate bug in the tracker. > > Are you planning to provide the compatible engine12.dll as part of Firebird 4, or in the next point release of Firebird 3? I had to add the second line with Security Database, because I got 'Missing security context' without it. I don't think this should be necessary. And I think it should be possible to use security3.fdb as well, with the proper provider in the definition. Regards Emil
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