Note: This ORM/SQL annotation is silently ignored by ObjectDB

143 words

javax.persistence.Lob - JPA annotation

javax.persistence
Annotation Lob

Target:
Fields (including property get methods)
Specifies that a persistent property or field should be persisted as a large object to a database-supported large object type.

Portable applications should use the Lob annotation when mapping to a database Lob type. The Lob annotation may be used in conjunction with the Basic annotation or the ElementCollection annotation when the element collection value is of basic type. A Lob may be either a binary or character type.

The Lob type is inferred from the type of the persistent field or property, and except for string and character-based types defaults to Blob.

Example 1:

   @Lob @Basic(fetch=LAZY)
   @Column(name="REPORT")
   protected String report;

Example 2:

   @Lob @Basic(fetch=LAZY)
   @Column(name="EMP_PIC", columnDefinition="BLOB NOT NULL")
   protected byte[] pic;

Since:
JPA 1.0
See Also:
Basic
ElementCollection
This annotation is a marker annotation (with no elements).

This documentation page 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.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.