You can make the normal type of sql query:
select * from users WHERE username='USERNAME' AND password='PASSWORD';

You can create this string in c-script using the str_cat function:
Code:
 
		string query; // holds the mysql query
		string username; // holds the username
		string password; // holds the password

		//Take input here//

		str_cat(query, "select * from users WHERE username='");
		str_cat(query, username);
		str_cat(query, "' AND password='");
		str_cat(query, password);
		str_cat(query, "';");


The str_cat function basically adds the second string given to the function at the end of the first string. For more information on this function, look it up in the manual.

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