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Navigation property and entityset usage in SAP segw transaction code
2022-07-05 13:01:00 【Wang Zixi】
Entity types include one or more navigation attributes . Navigation attributes describe the navigation path between entity relationships .
It is an attribute of an entity , Represents a link from this entity to one or more related entities .
The navigation attribute is bound to the association type (association type
), Allow from one end of the entity type that declares the navigation attribute ( Data source for navigation ) Navigate to the relevant end at the other end .
Navigation attributes are created through association
Necessary for linking from one entity to another .
Before creating navigation properties , You need to create entity types and associations first (association).
The navigation properties folder appears only after adding entity types .
double-click SEGW Inside Navigation Properties
Folder , open mass edit view
, I can see every one of them navigation property The following five columns need to be maintained :
stay Service Builder Entity sets are used in projects to combine instances of entity types with instances of any type derived from this particular entity type .
Entity type (Entity Type) Describe the data structure , The entity set contains instances of a given structure (instance
).
Right click “ Data model ” Folder , choice “ establish ”, And then choose “ Entity set ”. in addition , When you right-click the entity set folder and select Create , You can create a new entity set . open “ Create entity set ” Dialog box .
As shown in the figure below :
Requires filter checkbox The meaning of : Selecting this check box means that the service implementation needs a filter (filter). If you select this check box , You cannot directly access the entity set , And not without $filter
In the case of expression, query the entity set .
Association
Association describes the relationship between two or more entities , This relationship has an explicit name .
Associations define peer-to-peer relationships between participating entity types , Different... Can be supported at both ends multiplicities
, such as 1 For more than , How to 1,N:M wait .
An example of correlation is Customer and Order Relationship between entities , As shown in the figure below :
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