Find and Clear Operations in DDOs

The find and clear operations are discussed in the same section because they have much in common – in fact, one could argue that a clear is simply a special type of find. Finds and clears follow the same propagation rules and they treat relates-to constraints in a similar manner.

Clear Operations

The messages used to clear DDOs are Clear and Clear_All.

Send Clear of hoDDO

Find Operations

The primary find message is Find. It performs a find based on the contents of the file-buffer, performs a relate on parent DDOs, and updates all affected DEOs.

Send Find of hoDDO GT 1

Additional messages used for finding are:

• Request_Find
• FindByRowId
• Find_By_Recnum
• Request_Assign