System Generation Compiler › Adding, Modifying, and Deleting Entities › DELETE Verb

DELETE Verb

The DELETE verb disassociates component entities from systems and deletes system and component entities from the data dictionary. Deletions of component entities from a system are not reflected in the executable form of the system until the next successful GENERATE statement for that system.

How the Compiler Handles a DELETE Action

The system generation compiler responds to DELETE requests, as follows:

• In response to a DELETE SYSTEM request, the compiler deletes both the source and object records for the system and all object records that connect component entities to the system. To prevent the inadvertent deletion of entity definitions, the compiler does not delete source records for component entities when deleting a system. A GENERATE statement is not required after a DELETE SYSTEM statement.

  To delete source records for component entities that no longer participate in any systems (as a result of DELETE SYSTEM requests), you can use the IDD DDDL compiler.

  Note: For more information about using the DDDL compiler to delete entities, see the CA IDMS IDD DDDL Reference Guide.

• In response to a DELETE request for a component entity, the compiler places a delete flag on the object record that connects the entity to the current system. A successful GENERATE statement for the system causes the compiler to delete the flagged object record. If no other object records exist for the entity (that is, if the entity is not associated with any other system), the compiler also deletes the source record for the entity.

Note: The system generation compiler deletes source records only for entities created through the system generation compiler. You must use the IDD DDDL compiler to delete entities created through the DDDL compiler.

The following table illustrates system generation compiler actions in response to DELETE requests.