Using lifecycle events
Here is an example of using the @PreInsert, @PreUpdate, @PostRemove lifecycle events to demonstrate how to perform heuristic data manipulation.
Adding event driven triggers and hooks is easy with Onyx Database.
Below is listed a comprehensive set of event listeners that Onyx provides. Each listener is configured by adding a method within the entity that is enabled by adding an annotation above the method.
| Annotation | Lifecycle Event Description |
|---|---|
@PreInsert |
A method annotated with @PreInsert is executed prior to inserting an entity. This gives you the capability to modify or auto generate attributes. An example would be an attribute to indicate dateInserted. |
@PrePersist |
@PrePersist is much like @PreInsert except it will execute on both insert and update. Basically anytime you save that entity. |
@PreUpdate |
Invoked upon updating an already existing entity. |
@PostInsert |
Will be invoked after an entity has been inserted. If you make alterations to said entity, they will not be represented in the persistence store. |
@PostPersist |
Similar to @PostInsert except it does not just key on insert. It also keys off of update. |
@PostUpdate |
Invoked upon after updating an entity. |
@PostRemove |
After deleting an entity, post insert methods will be invoked. This gives you the ability to run any last business logic after the entity goes away. |
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