How to extract DB table data into csv file using python

Опубликовано: 12 Декабрь 2021
на канале: Kishan Mashru

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This is the 11th video of Database programming with Python video tutorial series. In this video we will see how to connect to the Oracle database using the cx_oracle package and extract data using the pandas library.

Steps performed:
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Create Connection
execute the query using run_sql_query
save the df data onto a csv file

The cx_Oracle is a Python extension module that enables access to Oracle Database. It conforms to the Python database API 2.0 specification with a considerable number of additions and a couple of exclusions.

cx_Oracle 7 has been tested with Python version 2.7, and with versions 3.5 through 3.8. You can use cx_Oracle with Oracle 11.2, 12, 18 and 19 client libraries. Oracle's standard client-server version interoperability allows connection to both older and newer databases. For example Oracle 19c client libraries can connect to Oracle Database 11.2.

Links to all videos related to Database programming with Python
=================================================================
1. Install cx_Oracle :    • Python | How to Install python packages
2. Create connection and create table :    • Python Programming | Connect to an Oracle ...
3. Insert record into the table with execute() :    • Python programming | Insert data into data...
4. Insert multiple records into the table with executemany() :    • Python programming | How to insert multipl...
5. Retrive all the data from the table using the fetchall() :    • Python programming | Select or get data fr...
6. Retrive one record from the table using the fetchone() :    • Python programming | Select or get data fr...
7. Retrive specific number of records from the table using the fetchmany() :    • How to read data from table in python | ex...
8. Use Bind Variables in the select statement to avoid complicating the query with concatenation operation :    • Python programming | Executing SQL queries...
9. use callproc method to execute oracle procedure with parameters :    • Python programming | How to execute Oracle...
10. use callfunc method to execute oracle function with parameters :    • How to execute Oracle Function from Python...
11. extract table data onto a csv file using python:    • How to extract DB table data into csv file...

Tools used in creating and executing the scripts:
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VSCode - Visual Studio Code
SQL Developer

Links used while creating the content:
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https://en.wikipedia.org/wiki/Pip_(pa...)

https://oracle.github.io/python-cx_Or...

https://github.com/oracle/python-cx_O...

Content and video created by - Kishan Mashru