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The string you've provided, "-1697 UNION ALL SELECT 34#" , is a classic example of a payload. This specific syntax is often used by security researchers or attackers to test if a database-driven website is vulnerable to unauthorized data access. What this string does:
: Ensure that if a field expects a number, it only receives a number. -1697 UNION ALL SELECT 34#
: 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. The string you've provided, "-1697 UNION ALL SELECT
: These can block common "UNION ALL" patterns before they ever reach your database. : This is the "injection" part
: This is the most effective defense.