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Some technical questions

Hi, ObjectDB looks interesting. Have two technical questions... (1) what locking model does ObjectDB use? I.e. 2PL or MVCC? Do writers block readers? Do readers block writers? (2) what's the recommended usage for SAAS? One ObjectDB database per customer, or one ObjectDB database for all? Thank you, Andrej ... implements online backups, does it implement something like MVCC, so it can see the data at the time the backup was started (to have ... implements online backups, does it implement something like MVCC, so it can see the data at the time the backup was started (to have ...

 
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removed objects stay with null field values in the reference

We have a class with a one to many relationship declared like this (1 or more objects of the same class are linked into the relationship, no circular referencing): ... We have a class with a one to many relationship declared like this (1 or more objects of the same class are linked into the ... But you may still have broken references to that object, like links to a web page that doesn't exist. ...

 
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Composite indexes

Hi, I read your manual about defining Indexes for JPA Entities (http://www.objectdb.com/java/jpa/entity/index), but I still have some problems understanding how and when should I use them.   Let's start with some example then. Assume we have an entity that represents an interior design image, called Inspiration : ... field that returns the smallest subset of unique records (like for example "isPublished" which is either true or false, then "room" which ... same field as secondary member in many @Indexes? Something like that : @ Index ( members = { ...

 
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EntityManager JPA or JDO impl and different behavior

Hi, I have an issue with the EntityManager. My persistance XML looks like: <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> ... an issue with the EntityManager. My persistance XML looks like: <?xml version = "1.0" encoding = "UTF-8" ?> ... manually in the transaction due to lack of time but would like to get to the bottom of LAZY/EAGER loading of maps.   ...

 
manual

[ODB1] Chapter 1 - About ObjectDB

Describes the main features and editions of ObjectDB 1.0 for Java/JDO.... you. You can even run your application on small devices like PocketPC (if Java is installed), because ObjectDB has a very small ... explore, query and edit the database content visually, is like developing software without a debugger. 1.2  ObjectDB Operating ...

 
forum_thread

Navigation to Collection Elements

Greetings ObjectDB team, Suppose I have a collection typed field (list/map/set...) in my persistent object of class X. Can I navigate (as oppose to using JOIN) to individual elements (in JPA & JDO) ? e.g.: x.list.get(10) x.map.get("key") x.list.get(10).get("key") // the element itself is a map Thanks & Best Regards... // the element itself is a map How about arrays like x.array[1] and x.array[1][2] ? Thanks & Best Regards ... it to be done in JPA/JDO queries. How about arrays like x.array[1] and x.array[1][2] ? If such navigations in ...

 
forum_thread

Great product - needs better marketing - more popularity

Hi, ObjectDB! While you have a very nice product, which I recommend everywhere I go, it is quite difficult to explain to my customers what is it and why we should use it, and things like that, because it's quite unknown.  It's a great product, therefore I'm building the 3rd product based on ObjectDB since the beginning of this year, but I think it would be much better if your db was more popular. ... customers what is it and why we should use it, and things like that, because it's quite unknown.  It's a great ... 13:12 I'd like to add my good experience with ObjectDB to that of zmirc. I've ...

 
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Path in tomcat

Hi, If I put the .jar into /opt/Tomcat/lib/, then where the .conf should be in? And the .odb? When I debug the Eclipse web project, I export all things into a .war file. Then I use Tomcat's web deploy tool by the .war file. However, if I put objectdb into the project's /WEB-INF/, I may lost the db when I use Undeploy tool. TIA ... You can try configuration like this (it's my day to day dev environment): - create directory ... Of course you can change this on Windows to something like "d:\objectdb" and then use this path. Now you can redeploy you application ...

 
forum_thread

Spring 4 setup

Can someone provide an example of setup ObjectDB embeded to be used with Spring4? Existing examples is like for Spring3 and I can't figure how to use ObjecDB in Spring tutorial: http://spring.io/guides/gs/accessing-data-jpa/   Thanx. ... to be used with Spring4? Existing examples is like for Spring3 and I can't figure how to use ObjecDB in Spring tutorial: ... to my pom file, otherwise I will get some exception like: 'Cannot determine embedded database driver class for database ...

 
forum_thread

objectdb-2.6.9_02 (with "objectdb.temp.no-enhancement-crc-check") vs. generic classes with interfaces: detailed investigation

objectdb-2.6.9_02 (with "objectdb.temp.no-enhancement-crc-check" system property) The following is a detailed report on investigation of multiple issues that have been mentioned in the following forum postings and issue reports (but please do not visit them from here now, the diagnostics there are now obsolete): - Issue #282 - ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection ... generic classes for "deep" value wrappers with signatures like: @ Entity abstract public class ... concerned with why one would bother to wrap something like a Boolean in this fashion, it is however a very powerful and crucial ...