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17

How to disable use of graphic windows by objectDB

. [root@GhostRider bin]# ./objectdb.sh start /usr/bin/sudo -b -u javauser /usr/java/jdk/bin/java -server ... -console start [root@GhostRider bin]# ObjectDB Server started on port 6136. #The server is running [root@GhostRider bin]# ps -ax | grep javauser 4238 pts/1 Sl 0:00 /usr/java/jdk/bin/java -server -Xms16M
15

CriteriaQuery .where() for multiple conditions

.equal(root.get("name"), name)); criteriaQuery.where(criteriaBuilder.equal(root.get("surname ... (); CriteriaQuery criteriaQuery = criteriaBuilder.createQuery(Person.class); Root root = criteriaQuery.from(Person.class); criteriaQuery.select(root); Predicate
15

java.sql.Date equals comparison not working with CriteriaAPI

= ...; Root<MyEntity> root = ...; java.sql.Date myDate = ...; Predicate predicate = builder.equal(root.get("eintritt"), builder.literal(myDate)); Doing exactly the same on the same DB in the DB ... );         Root<MyDateEntity> root = q.from(MyDateEntity.class);         q.select(root
3

javax.persistence.TupleElement

javax.persistence Interface TupleElement<X> Subinterfaces: CollectionJoin, CompoundSelection, Case, Coalesce, In, SimpleCase, Expression, From, Join, ListJoin, MapJoin, ParameterExpression, Path, PluralJoin, Predicate, Root, Selection, SetJoin, Subquery The TupleElement interface defines an element
3

javax.persistence.criteria.FetchParent

javax.persistence.criteria Interface FetchParent<Z,X> Subinterfaces: CollectionJoin, Fetch, From, Join, ListJoin, MapJoin, PluralJoin, Root, SetJoin Represents an element of the from clause which may function as the parent of Fetches. Since: JPA 2.0 Fetch<X,Y> fetch(String attributeName) Create
3

javax.persistence.DiscriminatorValue

. The inheritance strategy and the discriminator column are only specified in the root of an entity
3

Best practise loading big data

about the number of instances in the heap per type and paths of strong references from roots to objects? support ... One single root MyStepBlockCollection object. This referenced 10.000 MyStepBlocks, each ... the DB if the lists all hold references to the entities. The algorithm just holds the root element
3

Strange Error with Criteria API and Sorting

; import javax.persistence.criteria.Join; import javax.persistence.criteria.Root; public class ... .createQuery(TestEntity.class);   Root<TestEntity> root = query.from(TestEntity.class);   final Join<?, ?> otherJoin = root.join("other");   query.orderBy(cb.asc(cb.upper((Expression<String
0

javax.jdo.JDOException

javax.jdo Exception JDOException java.lang.Object java.lang.Throwable java.lang.Exception java.lang.RuntimeException javax.jdo.JDOException Implemented Interfaces: Serializable Subclasses: JDOCanRetryException, JDOFatalException This is the root of all JDO
0

FetchPlan.maxFetchDepth

Annotation Element javax.jdo.annotations.FetchPlan int maxFetchDepth The depth of references to instantiate, starting with the root object. Returns: the maxium fetch depth Default value: 1 Since: JDO 2.1

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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