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Tutorial
4

Step 2: Entity Class and Persistence Unit

.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity ... ; // Persistent Fields: @Id @GeneratedValue Long id; private String name
JDO Doc
4

javax.jdo.FetchGroup

javax.jdo Interface FetchGroup FetchGroup represents a named fetch group for a specific class or interface. A fetch group instance identifies the name of the class or interface, the list of members (fields or properties) to be fetched when the fetch group is active, and the recursion depth for each
JDO Doc
4

javax.jdo.Query

, import statements, ordering and grouping specifications, result and result class, the range ... specification, and grouping specification. The association with a PersistenceManager, the candidate ... for optimization purposes. Parameters: filter - the query filter. Since: JDO 1.0 void setGrouping(String group
JPA Doc
4

javax.persistence.metamodel.EntityType

that corresponds to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id attribute Returns: declared id attribute Throws
JPA Doc
4

javax.persistence.metamodel.IdentifiableType

to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id attribute Returns: declared id attribute Throws: IllegalArgumentException
JPA Doc
4

javax.persistence.metamodel.MappedSuperclassType

,Y> getDeclaredId(Class type) Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id
Forum
4

IN expression in a Criteria Query

_.employeeEntity)); for (Long id : emplIds) { Employee e = new Employee(id); inExpression ... .run(Unknown Source) I also found another issue with this query: SELECT a FROM Account a GROUP BY ... ). Regarding the GROUP BY query: SELECT a FROM Account a GROUP BY a.code HAVING COUNT(a) < 2
Forum
4

em.flush(); em.clear(); loosing data and not persisting managed objects

.persistence.Basic; import javax.persistence.Entity; import javax.persistence.Id; import javax ... = "mySchema") public class TestEntity {     @Id     private int id;     @Basic     @Lob     private String remark;     public int getId()     {     return id;     }     public void
Manual
3

Chapter 1 - Quick Tour

your IDE refer to one of the following tutorials: Getting Started with JPA and Eclipse Tutorial Getting ... on how to start using JPA in your IDE with the ObjectDB object database. Given the simplicity of ObjectDB, that should be quick and easy even for a novice.
Tutorial
3

Getting Started with JPA - Maven Project

will download the ObjectDB jar automatically. You may also open and run the Maven project in your IDE: NetBeans IDE and IntelliJ IDEA have built in Maven support.