Raise not supported exception when fetching a degenerate image (actual

image is stored in a LOB instead of inline)

Author: anthony-tuininga

doc/src/release_notes.rst

@@ -51,6 +51,9 @@ Thin Mode Changes
 #)  Fixed bug when using :ref:`asyncio <concurrentprogramming>` and calling a
     stored procedure with data that exceeds 32767 bytes in length
     (`issue 441 <https://github.com/oracle/python-oracledb/issues/441>`__).
+#)  Fixed bug when attempting to fetch a database object stored in a LOB. The
+    fetch will still fail but with an unsupported error exception instead of a
+    hang.
 #)  Error ``DPY-6002: The distinguished name (DN) on the server certificate
     does not match the expected value: "{expected_dn}"`` now shows the expected
     value.

src/oracledb/impl/thin/dbobject.pyx

@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------
-# Copyright (c) 2022, 2024, Oracle and/or its affiliates.
+# Copyright (c) 2022, 2025, Oracle and/or its affiliates.
 #
 # This software is dual-licensed to you under the Universal Permissive License
 # (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
@@ -76,6 +76,8 @@ cdef class DbObjectPickleBuffer(GrowableBuffer):
         self.read_ub1(flags)
         self.read_ub1(version)
         self.skip_length()
+        if flags[0] & TNS_OBJ_IS_DEGENERATE:
+            errors._raise_not_supported("DbObject stored in a LOB")
         if flags[0] & TNS_OBJ_NO_PREFIX_SEG:
             return 0
         self.read_length(&prefix_seg_length)