How to Retrieve Records After a DB Select Query in Python?

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To retrieve records after executing a database SELECT query in Python, you need to use a database connector or ORM (Object-Relational Mapping) library to establish a connection with the database, execute the query, and retrieve the results. Here’s an example using the popular sqlite3 module in Python:

import sqlite3

# Establish a connection to the database
conn = sqlite3.connect('your_database.db')

# Create a cursor object to execute SQL queries
cursor = conn.cursor()

# Execute the SELECT query
query = "SELECT * FROM your_table"
cursor.execute(query)

# Retrieve all records
records = cursor.fetchall()

# Process the retrieved records
for record in records:
    # Access the columns of each record
    column1 = record[0]
    column2 = record[1]
    # ... and so on

# Close the cursor and database connection
cursor.close()
conn.close()

In this example, you need to replace 'your_database.db' with the path or name of your database file and 'your_table' with the name of the table you want to select records from. Modify the SELECT query ("SELECT * FROM your_table") according to your specific requirements, including any filtering or ordering conditions.

The fetchall() method retrieves all the records returned by the SELECT query as a list of tuples. You can then process each record and access the values in each column using indexing (e.g., record[0], record[1], etc.).

Remember to close the cursor and database connection after you’re done retrieving the records to free up resources and maintain a clean exit from the database.

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