How Can I Use Python Lists with SQL Queries Using Parameterized Statements?

Utilizing Parameterized Queries to Incorporate Python Lists in SQL

Consider the scenario where you possess a Python list containing several elements, such as l = [1,5,8]. Your objective is to formulate a SQL query that extracts data associated with the list's elements, comparable to:

select name from students where id = |IN THE LIST l|

To achieve this, a parameterizable query proves to be an effective solution. This approach allows for the inclusion of both integers and strings within the query:

import sqlite3

l = [1,5,8]

# Define a placeholder depending on the specific DBAPI paramstyle.
# For SQLite, '?' is appropriate.
placeholder= '?' 
placeholders= ', '.join(placeholder for unused in l)

# Construct the SQL query with parameter placeholders.
query= 'SELECT name FROM students WHERE id IN (%s)' % placeholders

# Establish a database connection and cursor.
conn = sqlite3.connect('database.db')
cursor = conn.cursor()

# Execute the query with the Python list as parameter input.
cursor.execute(query, l)

# Retrieve and process query results.
for row in cursor.fetchall():
    # Access and utilize the data row here.
    pass

# Close the database connection.
conn.close()

By utilizing this technique, you can dynamically embed variable data from Python lists into your SQL queries, simplifying the process of retrieving data based on multiple parameter values.

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