public Integer getEntityID() {
        return entityID;
    }
Returns the ID of the entity entry which corresponds to this object in
the database, if it exists. Note that this is distinct from the objectID,
inherited from ObjectModel, which is specific to the actual type of
object represented by the entity.

@return
    The ID of this entity in the database, or null if this entity was
    not retrieved from the database.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/base/EntityModel.java