Read Write CLOB, BLOB Data from Oracle to MySql using Python

Preface

Ok friends, considering COVID-19 entire IT industry went on cost cutting and same I recently experienced in my Organization where I was asked to migrate from Oracle to MySQL. When I took this activity in my hand, I analyzed from root and came to know that while transferring data from Oracle to MySql is going to a bit challenging mainly for CLOB or BLOB data types as they are big in size.

Considering Python a legitimate language which works silently and having enrich libraries and Open Source too, I started research on it and finally build something which will help others to move from Oracle to MySql.

Prerequisite

User should have appropriate Oracle Client installed on the machine from which the script needs to be executed.
cx_Oracle package needs to be imported
mysql connector needs to be imported

Approach

In given code we will fetch all records from a table having BLOB/CLOB, Push into MySql database. Following is the code script which has to be run in .py file. Please change database credentials as per configuration:

#Importing references
import mysql.connector
import cx_Oracle
import pandas as pd
from mysql.connector import Error
from pandas import DataFrame

#open Oracle Connection
dsn_tns = cx_Oracle.makedsn('Host IP or Host name', 'Port Number', service_name='name of your service')
conn = cx_Oracle.connect(user='DB User', password='DB Password', dsn=dsn_tns)

#Open cursor
cursor = conn.cursor()

#buidling sql statement to select records from Oracle
sql = "SELECT * FROM ORACLE_BLOB_TABLE"

#Executing query
cursor.execute(sql)

#Create MySql INSERT statement
mySqlQury = "INSERT INTO ORACLE_BLOB_TABLE (COLUMN1, COLUMN2) VALUES(:COLUMN1, :COLUMN2)"

#Open mysql connection
mydb = mysql.connector.connect(user='mysql user', password='mysql db password', port='port number', host='MySql Host', database='database name', auth_plugin='caching_sha2_password')

#Loop on list of records from Oracle and push into the database
for row in cursor:
	mCursor = mydb.cursor(mySqlQury, row[0],row[1])
	mCursor.execute()
	mydb.close()
#Closing oracle connection
conn.close()
print("Data pupulated")

Next: Transfer data from Oracle to MySql using sqlalchemy Python

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Read Write CLOB, BLOB Data from Oracle to MySql using Python

Preface

Prerequisite

Approach

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