Lookups a reference to one of the objects in the this.
The generated reference must be freed with unref.
The gtype must match the type of the object in the odb; the method will fail otherwise. The special value
g_type_none may be passed to let the method guess the object's type.
| this |
a Repository. |
| oid |
a OId. |
| gtype |
a Type. |
|
the found Object, or null on error. |