How to Insert Blob in Oracle Database using Python

What Will You Learn?

In this tutorial, you will master the art of inserting Binary Large Objects (Blobs) into an Oracle database with the power of Python.

Introduction to the Problem and Solution

When dealing with databases, especially Oracle which offers specific data types like Blob for storing large binary data, it becomes crucial to handle them efficiently. By leveraging Python libraries such as cx_Oracle, we can seamlessly connect to an Oracle database and smoothly insert Blobs.


import cx_Oracle

# Establish a connection with the Oracle database
connection = cx_Oracle.connect('username/password@localhost/orcl')

# Retrieve the Blob data from a file or another source
blob_data = open('file_path/image.jpg', 'rb').read()

# Prepare the SQL query to insert Blob into the table
cursor = connection.cursor()
insert_blob_query = "INSERT INTO my_table (blob_column) VALUES (:blobData)"
cursor.execute(insert_blob_query, [blob_data])

# Close all connections

# Copyright PHD

Note: Ensure cx_Oracle library is installed in your Python environment.


To effectively insert Blobs into an Oracle database using Python, follow these steps: 1. Establish a connection with the database using cx_Oracle. 2. Read binary data from a file or any desired source. 3. Construct an SQL query with placeholders for inserting Blob data. 4. Execute the query by providing the blob data as input. 5. Commit changes made and properly close all connections.

  1. How can I install cx_Oracle library?

  2. You can easily install cx_Oracle via pip: pip install cx-Oracle.

  3. Can I insert Blobs other than image files?

  4. Absolutely! You can insert various types of binary data as Blobs including audio files, PDFs, etc.

  5. Do I need special permissions in Oracle for inserting Blobs?

  6. Ensure that your user has appropriate privileges on tables where Blob insertion is intended.

  7. How do I handle errors while inserting Blobs?

  8. Utilize try-except blocks to catch exceptions during insertion operations and manage them gracefully.

  9. Is there a size limit for inserting Blobs?

  10. While the maximum size of a single BLOB in Oracle is 4GB, it may be restricted by system resources too.

  11. Can I retrieve and display inserted Blobs later?

  12. Yes, you can retrieve Blobs from the database and display them within your application if required.

  13. Are there performance considerations while handling large Blobs?

  14. Inserting or retrieving large blobs might impact performance; consider optimizations like streaming instead of loading entire blobs into memory at once.

  15. Should I encode/decode Blob before insertion/retrieval?

  16. For raw binary content like images or audio files, direct insertion without encoding/decoding is recommended.

  17. How secure are Blobs compared to regular text fields in databases?

  18. Blobs offer enhanced security for storing sensitive binary information such as encrypted files compared to plain text fields due to their nature of storage as binary objects.


In this comprehensive guide on inserting Blobs in an Oracle Database using Python, you have gained valuable insights into efficiently managing large binary objects within an Oracle environment. For additional guidance or clarifications on this topic or any related queries concerning Python programming language, do visit our website

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