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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

_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

ObjectDB current status of the BIRT plugin

ObjectDB current status of the BIRT plugin

several times a day queries take several minutes

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

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

JPA Persistable Types

only once even if they are referenced multiple times. Referencing instances of other persistable types from multiple ... .Time, java.sql.Timestamp. Date and time types are discussed in more detail in the next paragraph. Date and Time (Temporal) Types The java.sql date and time classes represent different parts of dates

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

Literals in JPQL and Criteria Queries

are more generic and efficient because they can be compiled once and then run many times with different parameter ... ), a feature that is not currently supported by all JPA implementations. String Literals JPQL follows ... equivalent. Date and Time Literals JPQL follows the syntax of SQL and JDBC for date literals: Date - {d

[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

[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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