Community: Add bind variable support for oracle adb docloader (#30937)

PR title:
Community: Add bind variable support for oracle adb docloader
Description:
This PR adds support of using bind variable to oracle adb doc loader
class, including minor document change.
Issue:
N/A
Dependencies:
No new dependencies.

libs/community/langchain_community/document_loaders/oracleadb_loader.py

@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, Union
 
 from langchain_core.documents import Document
 
@@ -31,6 +31,7 @@ class OracleAutonomousDatabaseLoader(BaseLoader):
         wallet_password: Optional[str] = None,
         connection_string: Optional[str] = None,
         metadata: Optional[List[str]] = None,
+        parameters: Optional[Union[list, tuple, dict]] = None,
     ):
         """
         init method
@@ -44,6 +45,7 @@ class OracleAutonomousDatabaseLoader(BaseLoader):
         :param wallet_password: password of wallet
         :param connection_string: connection string to connect to adb instance
         :param metadata: metadata used in document
+        :param parameters: bind variable to use in query
         """
         # Mandatory required arguments.
         self.query = query
@@ -67,6 +69,9 @@ class OracleAutonomousDatabaseLoader(BaseLoader):
         # metadata column
         self.metadata = metadata
 
+        # parameters, e.g bind variable
+        self.parameters = parameters
+
         # dsn
         self.dsn: Optional[str]
         self._set_dsn()
@@ -96,7 +101,10 @@ class OracleAutonomousDatabaseLoader(BaseLoader):
             cursor = connection.cursor()
             if self.schema:
                 cursor.execute(f"alter session set current_schema={self.schema}")
-            cursor.execute(self.query)
+            if self.parameters:
+                cursor.execute(self.query, self.parameters)
+            else:
+                cursor.execute(self.query)
             columns = [col[0] for col in cursor.description]
             data = cursor.fetchall()
             data = [