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Column.unique

Annotation Element javax.persistence.Column boolean unique (Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint applies in
5

DatastoreIdentity.column

Annotation Element javax.jdo.annotations.DatastoreIdentity String column Name of the column for the datastore identity Returns: Name of the column for the datastore identity Default value: "" Since: JDO 2.1
5

PrimaryKey.column

Annotation Element javax.jdo.annotations.PrimaryKey String column Name of the column to use for the primary key Returns: the name of the column to use for the primary key Default value: "" Since: JDO 2.1
5

Order.column

Annotation Element javax.jdo.annotations.Order String column The name of the column to use for ordering the elements of the member. Returns: the name of the ordering column Default value: "" Since: JDO 2.1
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Version.column

Annotation Element javax.jdo.annotations.Version String column Name of the column for the version. Returns: the name of the column for the version Default value: "" Since: JDO 2.1
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Column.sqlType

Annotation Element javax.jdo.annotations.Column String sqlType SQL Type for this column. Returns: SQL type for this column Default value: "" Since: JDO 2.1
5

Column.targetMember

Annotation Element javax.jdo.annotations.Column String targetMember Target member in the other class or interface for this column when part of a bidirectional relation. Returns: the target member for this column when part of a bidirectional relation. Default value: "" Since: JDO 2.1
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Column.length

Annotation Element javax.jdo.annotations.Column int length Maximum length of data stored in this column. Returns: the maximum length of data stored in this column Default value: -1 Since: JDO 2.1
5

Column.jdbcType

Annotation Element javax.jdo.annotations.Column String jdbcType JDBC Type for this column. Returns: JDBC type for this column Default value: "" Since: JDO 2.1
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Column.scale

Annotation Element javax.jdo.annotations.Column int scale Scale for the column when handling floating point values. Returns: the scale for the column when handling floating point values Default value: -1 Since: JDO 2.1

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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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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.