Make connect_descriptor key mandator for configurations.

Author: anthony-tuininga

src/oracledb/errors.py

@@ -278,6 +278,7 @@ def _raise_not_supported(feature: str) -> None:
 ERR_PROTOCOL_HANDLER_FAILED = 2056
 ERR_PASSWORD_TYPE_HANDLER_FAILED = 2057
 ERR_PLAINTEXT_PASSWORD_IN_CONFIG = 2058
+ERR_MISSING_CONNECT_DESCRIPTOR = 2059
 
 # error numbers that result in NotSupportedError
 ERR_TIME_NOT_SUPPORTED = 3000
@@ -648,6 +649,9 @@ def _raise_not_supported(feature: str) -> None:
         'a bind variable replacement value for placeholder ":{name}" was '
         "not provided"
     ),
+    ERR_MISSING_CONNECT_DESCRIPTOR: (
+        '"connect_descriptor" key missing from configuration'
+    ),
     ERR_MISSING_FILE: "file '{file_name}' is missing or unreadable",
     ERR_MISSING_ENDING_DOUBLE_QUOTE: 'missing ending quote (")',
     ERR_MISSING_ENDING_SINGLE_QUOTE: "missing ending quote (')",

src/oracledb/impl/base/connect_params.pyx

@@ -122,8 +122,9 @@ cdef class ConnectParamsImpl:
         configuration.
         """
         connect_string = config.get("connect_descriptor")
-        if connect_string is not None:
-            self.parse_connect_string(connect_string)
+        if connect_string is None:
+            errors._raise_err(errors.ERR_MISSING_CONNECT_DESCRIPTOR)
+        self.parse_connect_string(connect_string)
         if self.user is None and self._password is None:
             user = config.get("user")
             password = config.get("password")