I am using this sample sqlite database and my code is
import sqlite3
conn = sqlite3.connect('chinook.db')
conn.execute("SELECT * FROM tracks")
rows = conn.cursor().fetchall()
It should have worked, but rows is empty?
What am I doing wrong here?
The Connection.execute shortcut returns a cursor instance, which you need to use with fetchall. In your code, you're creating a new, independent cursor.
Thus:
import sqlite3
conn = sqlite3.connect('chinook.db')
cursor = conn.execute("SELECT * FROM tracks")
rows = cursor.fetchall()
or even shorter (not recommended, but for those who like obscured one-liners):
rows = sqlite3.connect('chinook.db').execute("SELECT * FROM tracks").fetchall()
Or don't use Connection.execute shortcut, to avoid confusion:
import sqlite3
conn = sqlite3.connect('chinook.db')
cursor = conn.cursor()
cursor.execute("SELECT * FROM tracks")
rows = cursor.fetchall()
.execute()the cursor.conn.execute()is a shortcut. It does, however, return the cursor, which is where the problem is.conn.cursor().fetchall(); conn.execute()