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How to retrieve the ObjectDB version number?

) method to get the version number? Peter pezifromvienna Peter Sauer It is not JPA portable

Large (and growing) numbers of ODB-StoreHandler Threads

I'm not sure yet if this is a bug, however the number of OBD-StoreHandler threads seems to be growing over time. The database JVM now has about ~500 active threads total, most of them titled OBD-StoreHandler. What causes the creation of new OBD-StoreHandler threads? Is there a one to one mapping

Listing large number of complicated objects with paging.

are you trying to retrieve in every query execution (setMaxResults). Does that number affect? You may try

large numbers of records

large numbers of records

order by string with numbers

order by string with numbers

Locking in JPA

, are detected earlier. Optimistic Locking ObjectDB maintains a version number for every entity ... ) is 1. In every transaction in which an entity object is modified its version number is automatically increased by one. Version numbers are managed internally but can be exposed by defining a version

GROUP BY and HAVING clauses

functions of SQL: COUNT - returns a long value representing the number of elements. SUM - returns the sum ... values (numeric, strings, dates). The following query counts for every letter the number of countries with names that start with that letter and the number of different currencies that are used by

Auto Generated Values

number generator for every database. This number generator is used to generate automatic object IDs ... number generator is also used to generate numeric values for primary key fields annotated by ... id; : } During a commit the AUTO strategy uses the global number generator to generate

Database Management Settings

specifies the maximum number of concurrent threads that can be served by the database engine simultaneously ... are completed. The optimal number is usually larger than the number of available CPU cores, but not too large ... attribute specifies the speed of the index building background process as a number between 10 and 70

Paths and Types in JPQL and Criteria API

. But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean ... and functions (e.g. for strings and for numbers), they can be compared by all six comparison operators ... (number, boolean, string, date). For a path expression to be valid the user defined persistable class

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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