ExistenceChecking (EclipseLink 2.7.15, API Reference)

```
@Target(TYPE)
@Retention(RUNTIME)
public @interface ExistenceChecking
```
The ExistenceChecking annotation is used to specify the type of checking EclipseLink should use when determining if an entity is new or existing. It is specifically used on a merge() operation to determine if only the cache should be used to determine if an object exists, or the object should be read (from the database or cache). By default the object is read. An existence-checking specification is supported on an Entity or MappedSuperclass annotation.

See Also:

ExistenceType, DoesExistQuery

Author:

Guy Pelletier

Since:

Eclipselink 1.0

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  ExistenceType value
  (Optional) Set the existence check for determining if an insert or update should occur for an object.

- Element Detail
  - value
```
ExistenceType value
```
    (Optional) Set the existence check for determining if an insert or update should occur for an object.
    
    Default:
    
    org.eclipse.persistence.annotations.ExistenceType.CHECK_CACHE