-1697 Union All Select 34# | 2024 |

: This is a dummy value. By using a negative or non-existent ID, an attacker forces the original database query to return no results.

To prevent these types of attacks, developers should never insert user input directly into SQL queries. Instead, you should use: -1697 UNION ALL SELECT 34#

: In MySQL, this character marks the rest of the query as a comment, effectively "breaking" any remaining original code that might cause the attack to fail. Why are you seeing this? : This is a dummy value

: This is the "injection" part. It tells the database to append a second result set (containing the number 34 ) to the first (empty) result set. If the page then displays "34", the attacker knows the site is vulnerable and that they can use this spot to extract sensitive data like usernames or passwords. Instead, you should use: : In MySQL, this

: Ensure that if a field expects a number, it only receives a number.

: These can block common "UNION ALL" patterns before they ever reach your database.

: This is the most effective defense.