mysql injecting sleep statements caused denial of service and repair programme-vulnerability warning-the black bar safety net

mysql the presence of injection, and injecting sleep statements if you pass in a large enough parameter, for example: sleep9 9 9 9 9 9 9 9 9 9. If the database is using the myisam engine, and the injection point is a will lock TABLE statement, insert,replace,update,delete, then the entire data...