SQL 注入攻击无论是防火墙还是入侵检测系统都无法预防和阻止，唯一的办法是将应用本身的漏洞关闭。例如通过参数的传递配合存贮过程来实现数据库查询，这比动态的构建 sql 语句安全很多。比如在 ASP.net 中通过下面的程序将会避免攻击：
' Visual Basic example
Dim DS As DataSet
Dim MyConnection As SqlConnection
Dim MyCommand As SqlDataAdapter
Dim SelectCommand As String = "select * from users where username = @username"
...
MyCommand.SelectCommand.Parameters.Add(New SqlParameter("@username",
SqlDbType.NVarChar, 20))
MyCommand.SelectCommand.Parameters("@username").Value = UserNameField.Value
// C# example
String selectCmd = "select * from Authors where state = @username";
SqlConnection myConnection = new SqlConnection("server=...");
SqlDataAdapter myCommand = new SqlDataAdapter(selectCmd, myConnection);
myCommand.SelectCommand.Parameters.Add(new SqlParameter("@username",
SqlDbType.NVarChar, 20));
myCommand.SelectCommand.Parameters["@username"].Value = UserNameField.Value;
