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8.8. How JBoss Data Virtualization exposes schema for OData?
OData defines its schema using Conceptual Schema Definition Language (CSDL). Every VDB, that is deployed in an ACTIVE state in JBoss Data Virtualization server exposes its metadata in CSDL format. For example if you want retrieve metadata for your vdb northwind, you need to issue a query like
http://localhost:8080/odata/northwind/$metadata
Since OData schema model is not a relational schema model, JBoss Data Virtualization uses the following semantics to map its relational schema model to OData schema model.
|
Relational Entity
|
Mapped OData Entity
|
|---|---|
|
Model Name
|
Schema Namespace, EntityContainer Name
|
|
Table/View
|
EntityType, EntitySet
|
|
Table Columns
|
EntityType's Properties
|
|
Primary Key
|
EntityType's Key Properties
|
|
Foreign Key
|
Navigation Property on EntityType, Association, AssosiationSet
|
|
Procedure
|
FunctionImport
|
|
Procedure's Table Return
|
ComplexType
|
JBoss Data Virtualization by design does not define any embedded ComplexType in the EnitityType.
Warning
JBoss Data Virtualization does not define any one EntityContainer that resulted from different vdb models as a default container, so all entities must be accessed using full path to them.
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