About Container

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 #1 2010-09-15 05:53 Greetings ObjectDB team, Suppose I have a collection typed field (list/map/set...) in my persistent& ...

 
manual

Database Replication and Clustering

Replication enables maintaining up to date version of an ObjectDB database on multiple nodes. ObjectDB supports master-slave replication (cluster). When replication (or clustering) is used, the same database is managed on multiple machines (nodes), possibly in different geographic locations. This could help in achieving high availability, ...

 
issue

Error reading UTF string (Serialized Objects in Explorer)

This is the message I get for attached db and this query: Bug Version: 2.3.6 Priority: Normal Status: Fixed Replies: 6 Type:  Bug ...

 
forum_thread

Sample JDO Architecture for Follow Up Questions

I am trying to finalize on my application's JDO and ObjectDB archieture.  I have done documentation survey (reading JDO books, studying ObjectDB's documents and forum) and have designed what I think is the best architecture for my particular application usage model. #1 2016-07-25 15:26 I am trying to finalize on my application's JDO and ObjectDB archieture.  I have done documentation surv ...

 
release

2.3.6

Release date: 2012-01-09 Download (5.38 MB) Binary:  objectdb-2.3.6.zip You should start by following a  tutorial or reading the manual ...

 
forum_thread

Listing large number of complicated objects with paging.

Hi, For last few hours I was working on a problem with bad performance and memory problems with such a simple query: select prod from Product prod order by prod.id ASC Right now I have 55541 'Product' (attached to this post) entities in database and I'm trying to speed listing them with paging. The problem is, that running code that looks like this: #1 2011-11-15 18:32 Hi, For last few hours I was working on a problem with bad performance and memory problems with such a si ...

 
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. #1 2013-07-16 07:06 Hi, ObjectDB! While you have a very nice product, which I recommend everywhere I go, it is quite difficul ...

 
forum_thread

Check for index existence ?

Hello, Is there a simple way to check if indexes specified in entities are well taken into account by ObjectDb ? Regards, Xirt #1 2016-08-06 16:09 Hello, Is there a simple way to check if indexes specified in entities are well taken into account by Obj ...

 
manual

JPA Query Structure (JPQL / Criteria)

Explains the structure of a JPQL query, which consists of 6 clauses: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY. The syntax of the Java Persistence Query Language (JPQL) is very similar to the syntax of SQL. Having a SQL like syntax in JPA queries is an important advantage because SQL is a very powerful query language and many developers are already familiar wi ...

 
manual

ORDER BY clause (JPQL / Criteria API)

Explains how to use the ORDER BY clause in a JPA/JPQL query. The ORDER BY clause specifies a required order for the query results. Any JPQL query that does not include an ORDER BY clause produces results in an undefined and non-deterministic order. This page covers the following topics: ...