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JPA Entity Fields

; } In that case the employees field is filled with the results of the following query: SELECT e ... query results by specifying a selected key field using the MapKey annotation: @Entity public class

Database Transaction Replayer

files and tries to apply all the recorded operations. The resulting database file is also generated in ... succeeds, and all the operations until transaction 1000 are applied, the generated result file is expected to be 1000.odb.

Storing JPA Entity Objects

New entity objects can be stored in the database either explicitly by invoking the persist method or implicitly as a result of a cascade operation. Explicit Persist The following code stores ... to the database is sometimes also useful before executing queries in order to get up to date results

Numbers in JPQL and Criteria Queries

numeric promotion principles. For example, the resulting type of a binary arithmetic operation on an int ... an integer value. If the two operands share exactly the same type the result type is the same

WHERE clause (JPQL / Criteria API)

objects to the SELECT clause for collecting as query results, the WHERE clause gets an opportunity ... evaluates to TRUE are passed to the SELECT clause and then collected as query results. WHERE Predicate

ObjectDB - Object Database for Java (JPA/JDO)

layer. The result is better performance and faster applications, especially when the object data model is complex. See JPA benchmark results... Reduce development time. Improve productivity. ObjectDB

Query Parameters in JPA

Query parameters enable the definition of reusable queries. Such queries can be executed with different parameter values to retrieve different results. Running the same query multiple times ... ("name", name).getSingleResult(); } The WHERE clause reduces the query results to Country objects

Eclipse Public License - v 1.0

, and if a court requires any other Contributor to pay any damages as a result, the Commercial ... . Each party waives its rights to a jury trial in any resulting litigation.

Step 3: Add a Main Class

.class); List<Point> results = query.getResultList(); for (Point p : results

Step 3: Add a Main Class

); List<Point> results = query.getResultList(); for (Point p : results

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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