How to connect to Oracle Database with Wallet with Python.

To connect Python to Oracle Database using an Oracle Wallet, you can use the cx_Oracle or oracledb library with Oracle Client libraries (like Oracle Instant Client). Oracle Wallet simplifies secure connections by storing credentials and SSL certificates.

✅ Steps to Connect Python to Oracle using Oracle Wallet

Step 1: Install Required Python Package

pip install oracledb

Prefer oracledb (official Oracle-supported replacement for cx_Oracle).
Compatible with Oracle Wallet and works in both thin and thick modes.

Step 2: Install Oracle Instant Client

Download from Oracle Instant Client Downloads
Extract it to a known location (e.g., C:\oracle\instantclient_19_11 or /opt/oracle/instantclient_19_11)
Add the path to your system environment:

Linux/macOS:

export LD_LIBRARY_PATH=/path/to/instantclient:$LD_LIBRARY_PATH

Windows (Command Prompt):

set PATH=C:\oracle\instantclient_19_11;%PATH%

Step 3: Create or Use an Oracle Wallet

Oracle Wallet typically resides under:
network/admin folder inside the Oracle Client path.
Your folder should contain:
- sqlnet.ora
- tnsnames.ora
- cwallet.sso

Example sqlnet.ora:

WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = /path/to/wallet)))
SQLNET.WALLET_OVERRIDE = TRUE
SSL_SERVER_DN_MATCH = yes

Example tnsnames.ora:

MYDB_ALIAS =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCPS)(HOST = your_host)(PORT = 2484))
    (CONNECT_DATA = (SERVICE_NAME = your_service))
    (SECURITY = (SSL_SERVER_CERT_DN = "CN=your_cert"))
  )

Step 4: Python Code to Connect

import oracledb

# Optional: Switch to thick mode to use Oracle Wallet
oracledb.init_oracle_client(lib_dir="/path/to/instantclient")

# Use tns alias defined in tnsnames.ora
conn = oracledb.connect(dsn="MYDB_ALIAS")

# Use the connection
cursor = conn.cursor()
cursor.execute("SELECT * FROM dual")
for row in cursor:
    print(row)

cursor.close()
conn.close()

✅ If the wallet contains credentials, you don’t need to provide user and password.

🧪 Quick Checklist

Item	Required	Example
Oracle Instant Client	✅	`instantclient_19_11`
Oracle Wallet files	✅	`cwallet.sso`, `sqlnet.ora`, etc.
`tnsnames.ora` entry	✅	`MYDB_ALIAS = ...`
Python library (`oracledb`)	✅	`pip install oracledb`
`init_oracle_client()`	✅	For thick mode

Would you like help writing a sample sqlnet.ora and tnsnames.ora for your setup? Or are you facing a specific error?