mysql与php编程,sql语句的引号问题?
$db=mysql_connect("localhost","user","pass");
mysql_select_db("phpchat",$db);
$sql="SELECT * FROM content where roomname=$uroom order by conid";
$result=mysql_query($sql);
按常规sql语句中,$uroom是否要加引号?我发现有时不加也可以,可是要是用php中的/" ……/"来代替,有时连引号也会包含进去,请问各位您们遇到此类问题是如何解决的,或者哪里有这样的文章