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19

Online Backup

under the backup root directory, which by default is $objectdb/backup, i.e. a subdirectory ... . 201912312359) is created under the backup root directory and the backup database file itself is created in ... backup root directory can be specified by setting the target parameter before executing the backup
19

JPA Criteria API Queries

.getCriteriaBuilder(); CriteriaQuery<Country> q = cb.createQuery(Country.class); Root<Country ... the built query. Then a Root instance is created to define a range variable in the FROM clause. Finally ... (); CriteriaQuery<Country> q = cb.createQuery(Country.class); Root<Country> c = q.from(Country
17

javax.persistence.criteria.Subquery

: new expression of the given type Since: JPA 2.0 Root<Y> correlate( Root<Y> parentRoot) Create a subquery root correlated to a root of the enclosing query. Create a subquery root correlated to a root of the enclosing query. Parameters: parentRoot - a root of the containing query Returns: subquery
16

Database Replication and Clustering

databases on the slave server are automatically generated under a special root directory, $replication, under the server data root directory. Starting a new replication of an existing master database
16

WHERE clause (JPQL / Criteria API)

.createQuery(Country.class); Root<Country> c = q.from(Country.class); q.select(c ... .class); Root<Country> c = q.from(Country.class); q.select(c); ParameterExpression<Integer> p
15

javax.persistence.criteria.CriteriaQuery

: the modified query. Since: JPA 2.0 Root<X> from(Class<X> entityClass) Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots. Create and add a query root corresponding to the given entity, forming a cartesian product with any existing
15

javax.persistence.criteria.AbstractQuery

. It is not intended to be used directly in query construction. All queries must have: a set of root ... Returns: the modified query Since: JPA 2.0 Root<X> from(Class<X> entityClass) Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots. Create
11

Server Configuration

of an ObjectDB server is similar to the document root directory of a web server. Every database file in
1

[ODB1] Chapter 4 - JDO Metadata

is an XML file with a single root element - <jdo>. The <jdo> root has one or more <package> sub elements
1

javax.jdo.FetchPlan

() Get the root classes for DetachAllOnCommit. Get the root classes for DetachAllOnCommit. Returns: The detachment root classes Since: JDO 2.0 Collection getDetachmentRoots() Get the roots for DetachAllOnCommit. Get the roots for DetachAllOnCommit. Returns: Collection of detachment roots. Since: JDO 2.0 int

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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