Exploits using SQL injection have drawn a lot of attention for their ability to get through firewalls and intrusion detection systems to compromise your data layers. Whether it's a first-order or second-order injection, if you look at the basic code pattern, it is similar to any other injection issue where you use untrusted data in the construction of a statement. Most developers have started mitigating these vulnerabilities in Web front ends by using parameterized SQL queries in conjunction with stored procedures at the back end, but there are some instances where developers still use dynamically constructed SQL, like in the construction of Data Definition Language (DDL) statements based on user input or for apps written in C/C++.

At MSDN.

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