Class ForeignKeys


  • public final class ForeignKeys
    extends Object
    Algorithms related to foreign key constraint transparency
    • Method Detail

      • isNotTransient

        public static boolean isNotTransient​(String entityName,
                                             Object entity,
                                             Boolean assumed,
                                             SharedSessionContractImplementor session)
        Is this instance persistent or detached?

        If assumed is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.

        Parameters:
        entityName - The name of the entity
        entity - The entity instance
        assumed - The assumed return value, if avoiding database hit is desired
        session - The session
        Returns:
        true if the given entity is not transient (meaning it is either detached/persistent)
      • isTransient

        public static boolean isTransient​(String entityName,
                                          Object entity,
                                          Boolean assumed,
                                          SharedSessionContractImplementor session)
        Is this instance, which we know is not persistent, actually transient?

        If assumed is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.

        Parameters:
        entityName - The name of the entity
        entity - The entity instance
        assumed - The assumed return value, if avoiding database hit is desired
        session - The session
        Returns:
        true if the given entity is transient (unsaved)
      • getEntityIdentifierIfNotUnsaved

        public static Object getEntityIdentifierIfNotUnsaved​(String entityName,
                                                             Object object,
                                                             SharedSessionContractImplementor session)
                                                      throws TransientObjectException
        Return the identifier of the persistent or transient object, or throw an exception if the instance is "unsaved"

        Used by OneToOneType and ManyToOneType to determine what id value should be used for an object that may or may not be associated with the session. This does a "best guess" using any/all info available to use (not just the EntityEntry).

        Parameters:
        entityName - The name of the entity
        object - The entity instance
        session - The session
        Returns:
        The identifier
        Throws:
        TransientObjectException - if the entity is transient (does not yet have an identifier)
      • findNonNullableTransientEntities

        public static NonNullableTransientDependencies findNonNullableTransientEntities​(String entityName,
                                                                                        Object entity,
                                                                                        Object[] values,
                                                                                        boolean isEarlyInsert,
                                                                                        SharedSessionContractImplementor session)
        Find all non-nullable references to entities that have not yet been inserted in the database, where the foreign key is a reference to an unsaved transient entity. .
        Parameters:
        entityName - - the entity name
        entity - - the entity instance
        values - - insertable properties of the object (including backrefs), possibly with substitutions
        isEarlyInsert - - true if the entity needs to be executed as soon as possible (e.g., to generate an ID)
        session - - the session
        Returns:
        the transient unsaved entity dependencies that are non-nullable, or null if there are none.