Skip Headers

# Descriptors and Sequencing

Previous

Next

An essential part of maintaining object identity is managing the assignment of unique values (that is, a specific sequence) to distinguish one object instance from another. For more information, see "Projects and Sequencing".

Sequencing options you configure at the project (or session) level determine the type of sequencing that TopLink uses. In a CMP project, you typically configure the sequence type at the project level (see "Configuring Sequencing at the Project Level"). In a non-CMP project, you can use session-level sequence configuration to override project-level sequence configuration, on a session-by-session basis, if required (see "Configuring Sequencing at the Session Level").

After configuring the sequence type, for each descriptor's reference class, you must associate one attribute, typically the attribute used as the primary key (see "Configuring Primary Keys"), with its own sequence (see "Configuring Sequencing at the Descriptor Level").