从表中使用LIMIT选择一个“人”的数据

Question

I was wondering how to fetch data of a person from a table. I found the query to LIMIT data fetch from table. Here is what I got so far:

$result = mysql_query("SELECT * FROM users WHERE username = '" . $username[$x] . "' LIMIT " . $last_limt . " , " . $nxt_limt . "");

It returns data when LIMIT is available but if the LIMIT exceed the entire data returns null. So how can I know if ROW is available or not in table?

Answer 1

use mysql Count

SELECT count(username) FROM users WHERE username ='xyz'

And your $last_limt is not grater than total count-1

Answer 2

You have to check number of rows of the result from that query before proceeding

$result = mysql_query("SELECT * FROM users WHERE username = '" . $username[$x] . "' LIMIT " . $last_limt . " , " . $nxt_limt . "");
$rowcount=mysql_num_rows($result);
if($rowcount > 0)
{
    //next operations

}
else
{
    //No more data
}