Case sensitive search in SQL not working

Question

I created a database without defining the char set so it defaulted to Latin. Now I need to make a case sensitive search so I used the command:

    $sql = "SELECT * FROM Users WHERE username = '$value' COLLATE SQL_Latin1_General_CP1_CS_AS";

The problem is that it returns no matches. In my web page I have the <meta charset="utf-8"> in the head of the page, so I wonder if the charset encoding could be the problem. If I make a search without the COLLATE SQL_Latin1_General_CP1_CS_AS it works but it is case insensitive.

What could be the problem? Should I convert the database to always use utf-8?

Answer 1

尝试二进制运算符：

$sql = "SELECT * FROM Users WHERE BINARY username = '$_POST[userName]'";