Throw error DPY-2037: no object type specified for object variable when

attempting to create a variable of type DB_TYPE_OBJECT without
specifying a type name.

Author: anthony-tuininga

src/oracledb/cursor.py

@@ -36,7 +36,7 @@
 from . import connection as connection_module
 from .defaults import defaults
 from .var import Var
-from .base_impl import DbType
+from .base_impl import DbType, DB_TYPE_OBJECT
 from .dbobject import DbObjectType
 
 class Cursor:
@@ -793,6 +793,8 @@ def var(self,
         self._verify_open()
         if typename is not None:
             typ = self.connection.gettype(typename)
+        elif typ is DB_TYPE_OBJECT:
+            errors._raise_err(errors.ERR_MISSING_TYPE_NAME_FOR_OBJECT_VAR)
         if encodingErrors is not None:
             if encoding_errors is not None:
                 errors._raise_err(errors.ERR_DUPLICATED_PARAMETER,

src/oracledb/errors.py

@@ -168,6 +168,7 @@ def _raise_from_string(exc_type: Exception, message: str) -> None:
 ERR_ACCESS_TOKEN_REQUIRES_TCPS = 2034
 ERR_INVALID_OBJECT_TYPE_NAME = 2035
 ERR_OBJECT_IS_NOT_A_COLLECTION = 2036
+ERR_MISSING_TYPE_NAME_FOR_OBJECT_VAR = 2037
 
 # error numbers that result in NotSupportedError
 ERR_TIME_NOT_SUPPORTED = 3000
@@ -390,6 +391,8 @@ def _raise_from_string(exc_type: Exception, message: str) -> None:
     ERR_MISSING_BIND_VALUE:
             'a bind variable replacement value for placeholder ":{name}" was '
             'not provided',
+    ERR_MISSING_TYPE_NAME_FOR_OBJECT_VAR:
+            'no object type specified for object variable',
     ERR_MIXED_ELEMENT_TYPES:
             'element {element} is not the same data type as previous elements',
     ERR_MIXED_POSITIONAL_AND_NAMED_BINDS:

tests/test_2300_object_var.py

@@ -487,5 +487,10 @@ def test_2317_plsql_type_metadata(self):
         self.assertEqual(typ.package_name, "PKG_TESTSTRINGARRAYS")
         self.assertEqual(typ.element_type, oracledb.DB_TYPE_VARCHAR)
 
+    def test_2318_negative_create_object_var_no_type_name(self):
+        "2318 - test creating an object variable without a type name"
+        self.assertRaisesRegex(oracledb.DatabaseError, "^DPY-2037:",
+                               self.cursor.var, oracledb.DB_TYPE_OBJECT)
+
 if __name__ == "__main__":
     test_env.run_test_cases()