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36

java.time.*

I get errors when trying to persist anything in java.time.* For example LocalDate, Month, Period. Will these be supported sometime in the future? scoobyrooster Jason Java 8 date and tome is not supported yet, except by serialization (which is not recommended and disabled by default
36

Group by date / time

implementations support these expressions (as an extension to JPA) - support of date/time methods
36

Issue with compile time enhancement

I have an entity library which I have integrated build time enhancement in. The enhancer reports it has processed all of my persistent classes. When I attempt to run a Bootstrap process with this library I get the error shown below. The entity referenced in the error (Terms) is listed as having
29

_UserException: Attempt to open a database file '...' that is currently in use

around after searching google. However this exception only happen after running the app the second time. If I'm runnig the app the first time after rebooting my system. Everything is ok but after closing the app ... mode the database cannot be accessed at the same time by more than one process. Make sure
28

ObjectDB current status of the BIRT plugin

ObjectDB current status of the BIRT plugin
7

several times a day queries take several minutes

take around 10 seconds but sometimes several times a day take around 3-10 minutes
7

queries more than 10 times slower using 2.8.1 versus 2.7.6

to again and again transfer this huge database, we are a bit under time pressure hgzwicker Hans-Georg Zwicker
3

FROM clause (JPQL / Criteria API)

, CHARACTER_LENGTH, CLASS, COALESCE, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP ... response time. Database Management Systems (DBMS), including ObjectDB, try to optimize ... , since the referenced Capital objects are retrieved one at a time, i.e. the number of round trips to the database
0

[ODB1] Chapter 5 - JDO Connections

time this method is called, a PersistenceManager instance representing a connection to the database ... of the PersistenceManagerFactory at the time of this operation are used to initialize the new ... to be completed, using the temporary file, the next time the database is opened. This feature
0

[ODB1] Chapter 6 - Persistent Objects

, every transient object that, at commit time, is reachable from a persistent object (using persistent ... it. Therefore, for efficiency sake, it is recommended to avoid time consuming operations in no-arg ... are usually more efficient in terms of execution time and database space

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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