Sap Se

Lior Schejter

Stefan A Baeuerle

Timm Falter

Daniel Hutzel

Daniel Zoch

Jonathan Heller

Inbal Zilberman Kubovsky

Andreas Bader

Techniques are described for expressing a constraint in a host language. A constraint can be defined in the host language as an event handler. The event handler can be registered to a built-in event associated with an object of the database that the constraint is intended to validate. When the object triggers the built-in event, the event handler is called to execute the constraint. Exemplary built-in events include onSave (trigger the event when the object is saved), onValidate (trigger the event when an explicit call to validate the object is detected), onInsert (trigger the event when the object is inserted), onUpdate (trigger the event when the object is updated), and onCheckBeforeSave (trigger the event when the object is checked prior to saving).

Data models containing host language embedded constraints

A database language is extended to define constraints on a data model (e.g., entity-relationship model) rather than the concrete database. The constraints can be declarative (e.g., constraints that are defined using expressions of the database language) or programmatic (e.g., constraints that are defined as a stored procedure implemented in a domain specific language). By storing the constraints at a higher level than the database level, the constraints can be performed without changing the persistency of the database. Also disclosed are techniques for handling of constraints on partially loaded entities.

Advanced data models containing declarative and programmatic constraints

The present disclosure involves systems, software, and computer implemented methods for operating on type instances. One example method includes identifying a reference to a type instance during execution of a child control flow. The child control flow is associated with one or more ancestor control flows. One or more stack frames associated with the ancestor control flows are searched for a prior instantiation of the type instance. Access to the prior instantiation of the type instance in an identified stack frame associated with an identified ancestor control flow is provided in response to determining that the prior instantiation of the type instance exists in the identified stack frame. A new instance of the type instance is instantiated in a stack frame associated with the child control flow in response to determining that the prior instantiation of the type instance does not exist in the one or more stack frames.

Type instances

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Walldorf, Germany

Lior Schejter