SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/tech-sql-parameterization

How do parameterized queries block SQL injection?

They keep user input as data instead of SQL code.

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  1. They hide database names
  2. They separate code from data ✔
  3. They remove all punctuation

Why: The developer defines the SQL statement first and binds input values separately. An attack string is then treated as a literal value, not executable query syntax.

Huh, didn't know that: Escaping every input string is a discouraged primary defense because it is easy to apply incorrectly.

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The database told user input, 'You are data, stay in your parameter.'
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References

Answer: They separate code from data. The developer defines the SQL statement first and binds input values separately. An attack string is then treated as a literal value, not executable query syntax.

  1. OWASP SQL Injection Prevention Cheat Sheet cheatsheetseries.owasp.org/cheatsheets/SQL_Injection_Prevention_Cheat_Sheet.html
    the database will always distinguish between code and data, regardless of what user input is supplied
    Checked 2026-10-10.

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