About retrieve

forum_thread

Persist error @ManyToMany how to define correct entities relationships

I have Product entities containing a list of Category enties. Each product can have multiple Category but all sue the same limited set of Category entities. There is not changes made to Category from Product. The category ID is taken from the webservice Object ID (unique too). ... you initialize the categories of a new product? You should retrieve references to existing Category instances (possibly using ...

 
forum_thread

JBOSS AS7 7.1.1 - Entity not persisted and createNamedQuery fire exception

I'm trying to have the guestbook example running in the following environment: jboss as 7.1.1 final oracle jdk 1.7.0_04 maven 3.0.4 objectdb 2.4.0_04 installed as a module of jboss No IDE is used for building the Guestbook.war only maven.   My GuestDAO code is as follows: #1 2012-06-05 16:53 I'm trying to have the guestbook example running in the following environment: jboss as 7.1.1 ...

 
forum_thread

migration path from JPA / Hibernate

Hi. Is there a conversion tool or documentation that is of help when migrating an existing JPA solution to ObjectDB? Any recommendations or known pitfalls when it comes to ...   #1 2011-03-30 13:10 Hi. Is there a conversion tool or documentation that is of help when migrating an existing JP ...

 
release

2.2.7

Release date: 2011-06-14 Download (5.13 MB) Binary:  objectdb-2.2.7.zip You should start by following a  tutorial or reading the manual ...

 
manual

[ODB1] Chapter 5 - JDO Connections

The PersistenShows how to use database connections and transactions in JDO. ceManagerFactory interface represents a factory of database connections. Its main role is to provide PersistenceManager instances. The PersistenceManager interface represents a database connection. Every operation on a database requires a PersistenceManager instance. The Transaction interface represents a transaction on a database. Every operation that modifies the content of the database requires an active transaction.[toc hidden:1] This chapter describes three essential interfaces for using JDO: 5.1  javax.jdo.PersistenceManagerFactory 5.2  javax.jdo.PersistenceManager 5.3  javax.jdo.Transaction The PersistenceManagerFactory ...

 
tutorial

Step 4: Add a Servlet Class

Explains how to add a servlet that manages persistence using JPA and ObjectDB to an Eclipse Web Application. In this step we will add a servlet to manage guestbook web requests: Open the [Create Servlet] dialog box by right clicking the guest package node (in the [Package Explorer] window), selecting  New > Other... > Web > ...

 
issue

No Entity Class API

Both JPA and JDO are based on accessing and managing data in the database using persistable classes (mainly entity classes in JPA or persistence capable classes in JDO). Sometimes, it might be useful to access data without classes. For example, a tool that finds and replaces strings in the database should be generic and should not be bound to specific entity classes and persistent fields. An API for accessing (and maybe also modifying) data in the database without classes can be useful in some applications. Feature Request Version: Priority: Normal Status: Active Replies: 3 Type:  Feature Request ...

 
forum_thread

Speed of queries that return many objects

Hi, I have a DB of 146MB - with 1_000_000 elements. Loading the contents (objectDB query in java) takes about 10sec. I am using a recent MacBook (SSD blabla - disk I/O speed is about 400MB/sec - according to blackMagicTest app for mac) - so I was expecting the query to take less than one sec (146/400 = 0.35sec.. + some overhead). I was wondering if this kind of speed is "normal", or if this is something I should investigate. Thanks EKK #1 2015-08-29 21:10 Hi, I have a DB of 146MB - with 1_000_000 elements. Loading the contents (objectDB query in java) ...

 
tutorial

Step 4: Add a Servlet Class

Explains how to add a servlet that manages persistence using JPA and ObjectDB to a NetBeans Web Application. In this step we will add a servlet to manage guestbook web requests: Open the [New Servlet] dialog box by right clicking the guest package node (in the [Projects] window) and selecting New > Servlet ... Enter ...

 
manual

FROM clause (JPQL / Criteria API)

Explains how to use the FROM clause and JOIN expressions in a JPA/JPQL query. The FROM clause declares query identification variables that represent iteration over objects in the database. A query identification variable is similar to a variable of a Java enhanced for loop in a program, since both are used for iteration over o ...