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Time Sequence Object Command DB

We (www.s2ssystems.com) have a time-sequential object command database. I would like ... commands are generally used to trigger creation of transient objects. The database can be branched ... again that the database is not an object database, but rather a command database. You can of course think

Soft Reference Object Cache Recommendation

limit being exceeded before the post attempt. =( ) I desire to have my persistent objects be cached ... for my application. This would use a Least Recently Used (LRU) mechanism to get rid of older objects ... [] and instruct ObjectDB to use soft reference for its Level One (L1) object data cache. I disable the L2 cache

Setting and Tuning of JPA Queries

since the setter methods in Query and TypedQuery support method chaining (by returning the query object on which they were invoked). Flush Mode (setFlushMode) Changes made to a database using an EntityManager ... . Therefore, before a query is executed, uncommitted database changes (if any) have to be flushed to the database in

WHERE clause (JPQL / Criteria API)

JPQL query that retrieves selective objects from the database. Out of the four optional clauses ... over all the Country objects in the database using the c range variable. Before passing these Country ... with millions of objects in the database there is a huge difference in query execution time if proper

What is the Java Persistence API (JPA)?

. Using plain old Java objects (POJO) to represent persistent data can significantly simplify database ... and objects). ObjectDB is the only database management system with built in support of the Java ... The Java Persistence API (JPA) is a standard API for accessing databases from within Java

each 1-2 days objects on some objectdb level lock/block each other

queries without any object manipulation in these threads hgzwicker Hans-Georg Zwicker ... the database file using the new "objectdb.temp.concurrent-file-read" option. In both cases ... now urges to switch to another database. we try to agree on a bit more time, but the situation

What is ObjectDB?

ObjectDB is an Object Oriented Database Management System (ODBMS). It provides all the standard database management services (storage and retrieval, transactions, lock management, query processing ... objects (and graphs of objects) in an ObjectDB database directly. There's no need to define tables or

JPA Exceptions

to retrieve entity objects from the database. For example, when a required entity object is not found: or ... JPA exceptions are represented by a hierarchy of unchecked exceptions: java.lang.Object java ... , an attempt to update the database with no active transaction is represented by: Database update

Which API should I use - JPA or JDO?

code. When to prefer JDO JDO might be preferred when portability to other object databases is more important than general portability to both object and relational databases. JPA is designated to be used mainly with relational databases. ObjectDB is the only object database that supports JPA

ObjectDB 1.0 Manual

Welcome to the ObjectDB for Java/JDO Developer's Guide. Here you can learn how to develop database applications using ObjectDB and JDO (Java Data Objects), the revolutionary database programming ... and delete database objects. Chapter 7 - JDOQL Queries Describes JDOQL, the JDO Query Language. The last

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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