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What are the main benefits of using ObjectDB?

that ability and require multiple tables, multiple records and join operations in order to support
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What is ObjectDB?

objects (and graphs of objects) in an ObjectDB database directly. There's no need to define tables or
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ObjectDB Object Database Features

explanation. Schema tree for browsing the database schema (classes, fields, indices). Table view
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javax.persistence.InheritanceType

A strategy in which fields that are specific to a subclass are mapped to a separate table ... . A strategy in which fields that are specific to a subclass are mapped to a separate table than the fields ... .0 InheritanceType SINGLE_TABLE A single table per class hierarchy. A single table per class
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javax.persistence.SecondaryTables

javax.persistence Annotation SecondaryTables Target: Classes Specifies multiple secondary tables for an entity. Example 1: Multiple secondary tables assuming primary key columns are named the same in all tables. @Entity @Table(name="EMPLOYEE") @SecondaryTables({ @SecondaryTable
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javax.persistence.PessimisticLockScope

that are contained in join tables will be locked if the javax.persistence.lock.scope property is specified ... , element collections and relationships owned by the entity that are contained in join tables ... only the rows in the join table or collection table for that relationship or collection. This means
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Step 5: Design a BIRT Report Chart

with the real data: In the next step we will add a table view of the same data to the report.
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Step 4: Create an ObjectDB Data Set

the next steps we will use this data set to build a chart and a table.
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[ODB1] Chapter 7 - JDOQL Queries

demonstrated by the following table: Literal Type Samples of valid literals in JDOQL int 2003, -127, 0
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javax.jdo.annotations.Join

column Name of the column in the join table. Name of the column in the join table. Returns: the name of the column in the join table Default value: "" Since: JDO 2.1 Column[] columns Detail definition ... value: "" Since: JDO 2.1 String table Table to join to (used when joining to secondary tables

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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