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Shared (L2) Entity Cache

the database and added to the shared cache. On commit - new and modified entity objects are added

Paths and Types in JPQL and Criteria API

subinterfaces of From (Root, Join) - The creation of a FROM expression automatically modifies

Literals in JPQL and Criteria Queries

of an entity class is its unqualified name (i.e. excluding package name) but it can be modified by


Returns: the modified query Since: JPA 2.0 Root<X> from(Class<X> entityClass) Create and add a query ... expressions Returns: the modified query Since: JPA 2.0 AbstractQuery<T> groupBy( Expression... grouping ... are simply removed. Parameters: grouping - zero or more grouping expressions Returns: the modified

Step 3: Define an EJB Session Bean

using JTA - no need to wrap every operation that modifies the database (such as persist) by

Step 3: Define a Spring DAO Component

that modifies the database (such as persist) by transaction begin and commit. The next step is adding a Controller Class.

[ODB1] Chapter 1 - About ObjectDB

(for example, as a result of special customer needs or requests) can be done without modifying code. The JDO

[ODB1] Chapter 7 - JDOQL Queries

using any method that does not modify persistent objects, including instance methods and static


modifies the class to implement PersistenceCapable prior to loading the class into the runtime ... returns the current object id as modified in the current transaction. Returns: a copy of the ObjectId of this instance as modified in the transaction. Since: JDO 1.0 See Also: jdoGetObjectId


. Returns: a copy of the ObjectId of the parameter instance as modified in this transaction ... modified in this transaction. Since: JDO 2.0 See Also: PersistenceCapable.jdoGetVersion() Boolean ... . Instances that have been modified, deleted, newly made persistent in the current transaction, or

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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