[Dbappbuilder-relannounce] ANNOUNCE: Rel version 1.0.12 now available!

[Rel a. list. <dba...@li...>]

This version of /Rel/ -- an implementation of Date & Darwen's *Tutorial 
D* database language -- is a maintenance release featuring some 
enhancements and bug fixes.

Changes in this update:

* Enhancement: Rel: Updated storage engine to Oracle Berkeley DB Java 
Edition version 6.2.7.

* Enhancement: Rel: Database resilience after power failures or system 
crashes has been considerably improved.  In the majority of power 
failures or system crashes, it should be possible to load /Rel/ and 
resume use without errors or data loss.

* Fix: Rel: Updates to relation-valued parameters, which created 
side-effects, have been disallowed.

* Fix: Rel: TREAT_AS_type() and IS_type() did not work correctly with 
static inheritance.  This has been corrected.

* Fix: Rel: The following caused Rel crashes due to a "hash error" on 
Temperature_NoReading(), etc. This has been corrected.
        TYPE Temperature UNION;
        TYPE Temperature_Normal IS {Temperature POSSREP {t INTEGER}};
        TYPE Temperature_NoReading IS {Temperature POSSREP {}};
        TYPE Temperature_OutOfRange IS {Temperature POSSREP {}};
        VAR Readings REAL RELATION {timestamp INTEGER,
                               temp Temperature} KEY {timestamp};
        INSERT Readings REL {
         TUP {timestamp 12938, temp Temperature_Normal(33)},
           TUP {timestamp 12940, temp Temperature_Normal(33)},
           TUP {timestamp 12943, temp Temperature_Normal(34)},
           TUP {timestamp 12948, temp Temperature_NoReading()},
           TUP {timestamp 12955, temp Temperature_OutOfRange()}
        };

* Fix: Rel: Some CONSTRAINT failures displayed an un-helpful 
"Transaction is not active" error message instead of identifying the 
failing constraint.  This has been corrected.

For more information, or to download Rel, see 
http://dbappbuilder.sourceforge.net/Rel.html