About projection

manual

[ODB1] Chapter 3 - Persistent Classes

Explains what a persistence capable class is and which types are supported by JDO. Persistent Classes are user defined classes whose instances can be stored in a database using JDO. Instances of these classes that represent objects in the database are called persistent objects or persistent instances . Objects that do not repre ...

 
forum_thread

Insertion Speed Rate and Batch Load

1. I got about 10K inserts / second, is it normal? I would expect more than that, like close to 100K/second. I can definitely do 80K inserts/seconds on Oracle with batch insert on table with one primary key. 2. Is batch update/insert operation supported? I attached the files. #1 2011-05-03 22:01 1. I got about 10K inserts / second, is it normal? I would expect more than that, like close to 100K/second. I ca ...

 
forum_thread

Selective merge/cascade of detatched entity

I'm having an issue with my application, and I'm hoping you guys will be able to help. Please forgive typos and obvious errors, I'm having to retype from a non-internet connected network. A contrived example is: #1 2012-11-16 15:20 I'm having an issue with my application, and I'm hoping you guys will be able to help. Please forgive typ ...

 
release

2.3.1

Release date: 2011-10-02 Download (5.48 MB) Binary:  objectdb-2.3.1.zip You should start by following a  tutorial or reading the manual ...

 
release

2.3.0

Release date: 2011-09-21 Download (5.32 MB) Binary:  objectdb-2.3.0.zip You should start by following a  tutorial or reading the manual ...

 
forum_thread

PersistenceException UserException: Failed to validate persistence.xml

I'm really tired of looking at the same exception all day. I have DaoService which gets initialized when app starts. #1 2013-07-31 23:30 I'm really tired of looking at the same exception all day. I have DaoService which gets initialized when ...

 
manual

Index Definition

Describes how to define indexes in JPA entity classes and explains how indexes are used in JPQL queries.... ObjectDB also uses indexes for sorting results and for projection: SELECT MIN ( p . x ) FROM Point p ...

 
forum_thread

query on calendar class

Hello!   I'm looking for help to build query on calendar class. I need to get objects where Calendar.DAY_OF_WEEK is FRIDAY or any other. My class: @Entity public class Cdr {     private static final long serialVersionUID = 1L;        @Id @GeneratedValue     private long serialID;     private String A;     @Temporal(TemporalType.TIMESTAMP) private Calendar start; I tested: #1 2014-07-27 21:24 Hello!   I'm looking for help to build query on calendar class. I need to get objects wh ...

 
release

2.2.9

Release date: 2011-08-10 Download (5.15 MB) Binary:  objectdb-2.2.9.zip You should start by following a  tutorial or reading the manual ...

 
forum_thread

@OneToMany(fetch = FetchType.LAZY) list is always null

Hello. @OneToMany(fetch = FetchType.LAZY) doesn't work when using EJB or something else related to J2EE. parent.getChildren() returns null. Here is a simple example: Bean: #1 2014-06-05 20:19 Hello. @OneToMany(fetch = FetchType.LAZY) doesn't work when using EJB or something else related to J2 ...