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zip file or JAR manifest missing

I found the message: Error opening zip file or JAR manifest missing: /E:/projects/ObjectDB/bin/objectdb.jar Some of projects can read the DB, but others can not read or write the DB. Exception in ... (JpaQuery.java:613) ... 2 more Error opening zip file or JAR manifest missing: /E:/projects

using objectdb.jar in writing data to mariadb or mysql db

(for desktop version) and python or php for the web version but i want to code queries in native java ... to mariadb or mysql using native java JPA API and in some cases JPQL or must i store to an Objectdb unique ... . You cannot use to write to MySQL or MariaDB (as you cannot use PostgreSQL to write to MySQL). You can use

EntityManager JPA or JDO impl and different behavior

.jdo.PMImpl Whats going on here? Is the entityManager not controlled by the persistance.xml or is something in the spring is doing something I don't understand? Or have I missed something? The reason I ... . So if the "equals" or "hashcode" method use more than the database id for generation or comparison

OR not working with isNull

); Predicate ownerIsNull = cb.isNull(root.get("owner")); Predicate ownerMatchesOrIsNull = cb.or(ownerIsNull, isOwnedByUser); The isNull predicate will only match records when NOT inside the OR predicate. The other predicate works normally within or outside the OR. bhamilton Bruce Hamilton Your query

Eager Fetch is not stable for collection or map types?

Hi, thanks very much for your helpful software. The problem is the storage of collection or map ... FrankChu Currently there is no known open bug that can cause this problem (including in using or not ... , and the additional info is we confirm that the collection or map are stored successfully by using explorer

@OneToOne query issue with OR and IS NULL

the second one "another" is set. Now I want to query "select from A where another is null OR ... advance, Patrick paddy Patrick Gerhardt Your query: SELECT FROM A WHERE another IS NULL OR ... WHERE a.another IS NULL OR b.counter = 0 You missed the A instance with no another because navigation

Is there a function of "drop table" or "delete from table"?

Besides the em.remove() one by one, is there a function of "drop table" or "delete from table"? TIA gzdillon Lai Yang You can execute a DELETE query:     em.createQuery("DELETE FROM MyEntity e ... ").executeUpdate();” works, but it can not reset id to zero! "drop table" or "delete from table" or "truncate

Corrupted Database or error in ObjectDBExplorer?

). Can you analyze the problem and tell us if its a problem of the explorer or a real problem in ... the Tree or Table Window for com.btc.ep.analysis.test.bl.internal.dmos.RequirementBasedTestCaseImpl ... the the classpath (either in the Explorer or using your application) in order to update the schema. support

Should I be able to persist a JFrame (or gui components in general)?

: Absent Code attribute in method that is not native or abstract in class file javax/persistence ... on the runtime error, or how I could reduce amount of code to map UI to a database to as little as possible ... don't get it, or whatever. And second, the idea of persisting interface components

Is it ok to put list or map of embeddable objects in entity ?

Hi, Is it ok to put list or map of embeddable objects in entity? I mean, for example : @Entity ... . Since there is no separate space allocation for the collection or its elements - every time the entity object is stored ... .ALL). And that's not happening... Is that a bug or are cascade operations not supported with Embeddable classes

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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