Database Error

What This Error Means

This error occurs when trying to fetch rows from a database cursor, but there are no rows to fetch. It typically happens when a SELECT statement returns an empty set or when a query is executed with incorrect parameters.

Why It Happens

This error happens when the database query executed by the cursor does not return any rows, which can be due to incorrect SQL syntax, incorrect parameters, or an empty database table. It can also occur when a query is executed with parameters that do not match any rows in the database table.

How to Fix It

1. 1To fix this error, ensure that the database query is correct and that the parameters passed to the query are correct. Also, verify that the database table is not empty and that the query is executed with the correct parameters. Here are some steps to fix this error:
2. 2 1. Check the database query for any syntax errors.
3. 3 2. Verify that the parameters passed to the query are correct.
4. 4 3. Check if the database table is empty.
5. 5 4. Use a try-except block to handle this error and provide a meaningful error message to the user.

Example Code Solution

import sqlite3
conn = sqlite3.connect(':memory:')
cur = conn.cursor()
cur.execute('SELECT * FROM users WHERE id=1')
rows = cur.fetchall()
if not rows:
    print('Error: No rows in result set')

import sqlite3
conn = sqlite3.connect(':memory:')
cur = conn.cursor()
try:
    cur.execute('SELECT * FROM users WHERE id=1')
    rows = cur.fetchall()
    if not rows:
        print('Error: No users found with id 1')
except sqlite3.Error as e:
    print(f'Error: {e}')