Python select from SQLite table

To perform a SELECT operation on an SQLite table using Python, you can use the sqlite3 module, which is part of the Python standard library. SQLite is a lightweight, embedded database engine, and the sqlite3 module provides a convenient way to interact with SQLite databases in your Python applications. Here’s a step-by-step guide on how to SELECT data from an SQLite table using Python:

Import the sqlite3 module

import sqlite3

Connect to the SQLite database

conn = sqlite3.connect('your_database.db')

Replace ‘your_database.db’ with the path to your SQLite database file.

Create a cursor object

cursor = conn.cursor()

Execute an SQL query to retrieve data from the table. You can use the SELECT statement to retrieve specific data from a table:

cursor.execute("SELECT * FROM your_table_name")

Replace ‘your_table_name’ with the name of the table you want to retrieve data from.

Fetch the data using one of the fetch methods. You can use methods like fetchone(), fetchall(), or fetchmany() depending on your needs:

fetchone(): Retrieves the next row of the result set.

data = cursor.fetchone()
print(data)

fetchall(): Retrieves all rows from the result set.

data = cursor.fetchall()
for row in data:
    print(row)

fetchmany(n): Retrieves ‘n’ rows from the result set.

data = cursor.fetchmany(5)  # Retrieve 5 rows
for row in data:
    print(row)

After fetching the data, it’s good practice to close the cursor and the database connection:

cursor.close()
conn.close()

Here’s a complete example:

import sqlite3

# Connect to the SQLite database
conn = sqlite3.connect('your_database.db')
cursor = conn.cursor()

# Execute a SELECT query
cursor.execute("SELECT * FROM your_table_name")

# Fetch and print the retrieved data
data = cursor.fetchall()
for row in data:
    print(row)

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

Make sure to replace ‘your_database.db’ with the actual path to your SQLite database file and ‘your_table_name’ with the name of the table you want to retrieve data from.