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ObjectDB Object Database Features

attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... can manage databases of various sizes efficiently, ranging from kilobytes to terabytes. Platform ... ). Unlimited CPUs and cores. Reliability and Stability Recovery from failure by using a recovery file

Index Definition

, long, float, double. Equivalent wrapper classes from package java.lang: Byte, Short, Character, Integer ... query execution. Indexes are especially efficient in lookup and range queries: SELECT p FROM Point p WHERE p.x = 100 SELECT p FROM Point p WHERE p.x BETWEEN 50 AND 80 SELECT p FROM Point p

Privacy Policy

, either generated by the use of the Service or from the Service infrastructure itself (for example, the duration ... from https://www.objectdb.com You means the individual accessing or using the Service, or ... where the data protection laws may differ than those from Your jurisdiction. Your consent

Strings in JPQL and Criteria Queries

(when present) specifies from which position to start the search. LOWER and UPPER - Changing String Case ... ] FROM] str) function returns a string after removing leading and/or trailing characters (usually space characters). For example: TRIM(' UK ') is evaluated to 'UK'. TRIM(LEADING FROM ' UK ') is evaluated

JPA Persistable Types

only once even if they are referenced multiple times. Referencing instances of other persistable types from multiple ... . In most cases ObjectDB can overcome a missing no-arg constructor. Aside from these constraints ... : boolean, byte, short, char, int, long, float and double. Equivalent wrapper classes from package

Query Parameters in JPA

) The following method retrieves a Country object from the database by its name: public Country ... ( "SELECT c FROM Country c WHERE c.name = :name", Country.class); return query.setParameter ... .createQuery( "SELECT c FROM Country c WHERE c.name = ?1", Country.class); return query

JPA Entity Fields

fields (including persistent fields that are inherited from ancestor classes), is stored ... . Instead, employees is automatically populated when a Department entity is retrieved from ... the Department entity): SELECT e FROM Employee e WHERE e.department = :d The mappedBy element defines

[ODB1] Chapter 7 - JDOQL Queries

There are various ways to retrieve objects from an ObjectDB database, as shown in section 6.3 ... for RDBMS. It provides object retrieval from the database according to a specified selectioPlan ... is a subset of objects from the candidate collection that contains only the instances of the candidate class

[ODB1] Chapter 5 - JDO Connections

PersistenceManager instances. From the developer's point of view, connection pool management ... () method is the same for both new database connections and database connections obtained from a pool ... for all the transactions of PersistenceManager instances obtained from that factory. Setting these flags


) Delete the persistent instance from the data store. Delete the persistent instance from the data ... of the instance is not deleted from the data store. This method has no effect if the instance ... void deletePersistentAll(Object... pcs) Delete an array of instances from the data store. Delete

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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