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JPA Query API

for both Query and TypedQuery: Query q1 = em.createQuery("SELECT c FROM Country c"); TypedQuery<Country> q2 = em.createQuery("SELECT c FROM Country c", Country.class); In the above code
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Schema Update

new-name attribute is specified, the package name is changed from the original name ... is specified the class name is changed from the original name, which is specified by the required name
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JPA Queries

. "SELECT c FROM Country"). Criteria Query API Building dynamic queries with a structure that is known ... three groups. SELECT and ORDER BY elements (including tuples): FROM clause elements (representing range
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Locking in JPA

JPA 2 supports both optimistic locking and pessimistic locking. Locking is essential to avoid update collisions resulting from simultaneous updates to the same data by two concurrent users. Locking ... for locking entity objects when they are retrieved from the database. In addition to improving
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UPDATE SET Queries in JPA/JPQL

an alternative way of updating entity objects. Unlike SELECT queries, which are used to retrieve data from the database, UPDATE queries do not retrieve data from the database, but when executed, update
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ObjectDB Website - Terms and Conditions of Use

from using or accessing this site. The materials contained in this web site are protected by ... notations from the materials; or transfer the materials to another person or "mirror" the materials
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Storing JPA Entity Objects

, the entire closure of entity objects that are reachable from that object by navigation through persistent ... and flush enables moving the temporary updates from memory to the database. Note: Flushing updates
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Database Connection using JPA

instance obtained from the EntityManager. An EntityManager instance also functions as a factory ... } finally { em.close(); } The EntityManager instance is obtained from the owning
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javax.jdo.datastore.DataStoreCache.EmptyDataStoreCache

. Since: JDO 2.0 void evict(Object oid) Evict the parameter instance from the second-level cache. Evict the parameter instance from the second-level cache. Parameters: oid - the object id of the instance ... - Since: JDO 2.0 void evictAll() Evict the parameter instances from the second-level cache. Evict
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javax.jdo.datastore.DataStoreCache

void evict(Object oid) Evict the parameter instance from the second-level cache. Evict the parameter instance from the second-level cache. Parameters: oid - the object id of the instance to evict. Since: JDO 2.0 void evictAll() Evict the parameter instances from the second-level cache. Evict

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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