-6207' Union All Select Null,null,null,char(113)||char(122)||char(106)||char(112)||char(113)||char(110)||char(117)||char(68)||char(76)||char(114)||char(89)||char(111)||char(84)||char(100)||char(85)||char(75)||char(116)||char(73)||char(83)||char(105)||char Official

Ensure the data matches the expected format (e.g., an ID should only be an integer).

This is the most effective defense. Instead of building a query string with user input, you use placeholders. The database treats the input strictly as data, not as executable code. Ensure the data matches the expected format (e

Strip out potentially harmful characters like ' , -- , or ; . 3. Use an ORM (Object-Relational Mapper) Ensure the data matches the expected format (e