Create Relationship Class—Help | ArcGIS for Desktop
In short "simple rc" is a one-to-one - no rules. He doesn't describe attributed relationship classes, But states that composite rc can be many to. Simple and Composite. Simple relationships exist between two tables whose objects can exist independently of one another. Ex: if you delete a parcel record in. You can use a wizard to create a composite relationship class. The example in this Learn more about creating a simple relationship class · Learn more about.
In order to track these relationships, each relationship entry contains a unique RID value along with the primary and foreign key. M non-attributed feature classes: If inserting with FME you would either be starting with empty feature classes because as soon as you create the relationship in ArcMap, the relationship is already completedor you would be deleting and re-inserting features which participate in the relationship and thus rebuilding that relationship.
- Creating a simple relationship class
- Creating a composite relationship class
N attributed relationships and M: If you have populated feature classes and need to insert into the relationship table to populate it, or you want to update or insert attributes in an attributed relationship table, you may simply insert into the relationship table directly without writing to the feature classes which participate in the relationship. The assumption here is you already have a table or some source with those relationships defined.
It's probably a less common workflow but it's doable and perhaps a good advanced post or just something we add to one of the articles as an aside. This is in part because populating these relationships in ArcGIS requires the origin and destinations to be picked interactively rather than just defining the relationship.
As such, If the features which participate in the relationship classes already exist in the database and only the relation table needs to be populated, the features which participate must still be read. Deleting records from a Relationship Class A little more on deleting records for a relationship class You can delete individual records from a relationship class.
To do this you can: This will depend on the relationship 1: But if you delete the participating features then the associated relationship record should be removed. For example, for a 1: M you should only have to remove the origin parent feature.
These act like a unique key to the relation record. You do need to set a key field on the FME Geodb writer i. Relationship properties When you create a relationship class, you must define its properties. The properties tell ArcGIS exactly how the tables should relate to each other.
Create Relationship Class
Some relationship properties have already been described, such as cardinality and origin and destination tables. The others are described below. User-defined properties for a relationship class are summarized in the New Relationship Class wizard. Once a relationship class has been created, you cannot modify its properties. Labels Relationship classes have forward and backward path labels that describe the relationship when you're navigating from one table to another in ArcMap.
Creating a simple relationship class—Help | ArcGIS for Desktop
The forward path label displays when you're navigating from the origin table to the destination table. The backward path label displays when you're navigating from the destination to the origin table. In this example, a relationship class has been created between two feature classes: Transformers is the destination feature class. The backward path label displays in ArcMap for easy navigation to the origin table, Poles.
Relationship types and messaging There are two types of relationships: Simple relationships exist between two tables whose objects can exist independently of one another. When related objects change, no messages are sent between the tables.