23 | Object comparation never matches/jpa/query/jpql/comparison Section "Comparable Data Types" Comparison is supported for values ... to enable this feature again. However, there are still reasons to prefer value comparison as suggested in #2 above: Value comparison is compatible with JPA and therefore more portable. Value |
21 | Searching lists within objects will have an answer. Thanks P. pedwards Paul Edwards You are right about comparison of entity objects - it is based on ID comparison. It is unclear why you manage two levels of nested lists. For the simplicity ... such comparison, so it might be still more efficient to use multiple JOINs in this case. support Support Okay |
16 | New to Product & Having An Issue that comparison for these classes follow the logic of == in Java rather than of equals. john_anderson_ii John Anderson You are right. The documentation was wrong (about comparison of embedded objects ... to that part of the documentation and it's much more clear on how comparisons should be made. Thanks for updating it! john |
13 | query on calendar class this information into an additional persistent field. The comparison failed because of comparing ... is for literals, so it cannot contain variables or parameters. In comparison the operand types must match. Not |
13 | Optimization Question factors. For example, if your classes have many indexes - smart comparison might be faster ... can help. ObjectDB does such comparisons internally to determine if a merged object |
9 | persisting object with long[][] arrays of array.clear(); emg.close(); EMF.close(); } as a comparison I ran it with simple arrays |
9 | Possible issue for JPQL "LEFT [OUTER] JOIN" comparison: "SELECT a,b FROM A a LEFT OUTER JOIN a.listB b WHERE b.a IS NULL" By the way, it is a workaround |
3 | [ObjectDB 2.5.5_03] Unexpected exception (Error 990): • Comparison or arithmetic operations with a NULL value always yield an unknown value. Hence t ... , because it is comparison with NULL. But t.lastGeocodedPosition.receiveTime is not NULL but NPE so you do not compare null. Accessing fields through a null expression is very different from comparison and arithmetic |
3 | ObjectDB 2 JDO Manual agree with most of the comparisons that we've probably all seen on the Web concluding that JDO ... thoroughly) for more documentation? AlphaOne Ron Brennan > I agree with most of the comparisons that we've ... . Please look carefully who published these comparisons. Actually the differences between JPA and JDO technical |
1 | ObjectDB 2.2.5 instantiation. Fixed a bug in comparison of collections to values in queries. |
