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52

FieldResult.column

Annotation Element javax.persistence.FieldResult String column Name of the column in the SELECT clause - i.e., column aliases, if applicable. Since: JPA 1.0
52

Column.table

Annotation Element javax.persistence.Column String table (Optional) The name of the table that contains the column. If absent the column is assumed to be in the primary table. Default value: "" Since: JPA 1.0
52

Column.scale

Annotation Element javax.persistence.Column int scale (Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.) Default value: 0 Since: JPA 1.0
52

Column.columnDefinition

Annotation Element javax.persistence.Column String columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column. Defaults to the generated SQL to create a column of the inferred type. Default value: "" Since: JPA 1.0
52

Column.length

Annotation Element javax.persistence.Column int length (Optional) The column length. (Applies only if a string-valued column is used.) Default value: 255 Since: JPA 1.0
5

Value.column

Annotation Element javax.jdo.annotations.Value String column Name of the column to store the value in. Returns: the name of the column to store the value in Default value: "" Since: JDO 2.1
5

Discriminator.column

Annotation Element javax.jdo.annotations.Discriminator String column Name of the column for the discriminator Returns: the name of the column for the discriminator Default value: "" Since: JDO 2.1
5

Join.column

Annotation Element javax.jdo.annotations.Join String column Name of the column in the join table. Returns: the name of the column in the join table Default value: "" Since: JDO 2.1
5

Key.column

Annotation Element javax.jdo.annotations.Key String column Name of the column to store the key in. Returns: name of the column to store the key in Default value: "" Since: JDO 2.1
5

Element.column

Annotation Element javax.jdo.annotations.Element String column Name of the column to store the element in. Returns: name of the column to store the element in Default value: "" 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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Which JPA is Faster?

 

See a comparison of Hibernate, EclipseLink, OpenJPA, DataNucleus, MySQL, PostgreSQL, Derby, HSQLDB, DB4O by Versant, H2 Database, SQLite and ObjectDB

in the JPA Benchmark.

Copyright © 2003, 2010, 2023  ObjectDB Software, all rights reserved. The JPA API Reference Documentation (JavaDoc) on this website is derived with some adjustments from the open source JPA 2 RI (EclipseLink) and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0. The JDO API Reference Documentation (JavaDoc) on this website is derived with some adjustments from the JDO 2.2 API and is available under the terms of the Apache License, v. 2.0. Images on this website are available under these licecnes. Documentation on this website explains how to use JPA in the context of the ObjectDB Object Database but mostly relevant also for ORM JPA implementations, such as Hibernate (and HQL), EclipseLink, TopLink, OpenJPA and DataNucleus. ObjectDB is not an ORM JPA implementation but an Object Database (ODBMS) for Java with built in JPA 2 support.