MYSQL num行错误

Question

Hi I am trying to use a piece of code which I have used before to quickly test out an idea, however I Keep getting the following error.

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in

$result = mysql_query("SELECT * FROM masterip_details WHERE timedate(datetime) = CURDATE() and ip_address='$ip_address");
$num_rows = mysql_num_rows($result);
if( $num_rows > 0 ) {

Answer 1

That's probably because the SQL request failed. Try to append or die(mysql_error()) next to your mysql_query, like this :

$result = mysql_query("SELECT * FROM masterip_details WHERE timedate(datetime) = CURDATE() and ip_address='$ip_address") or die(mysql_error());

This should output the error so that you can fix it.

EDIT: And I can also give you a clue of what that error could be. At the end of your request, you're not closing the single quote after $ip_address

Answer 2

您的查询中存在一个sintax错误，您只需在$ip_address更改为后就缺少引号

$result = mysql_query("SELECT * FROM  masterip_details WHERE timedate(datetime) = CURDATE() and ip_address='$ip_address'");

Answer 3

Try this. You are missing one single quote...

 $result = mysql_query("SELECT * FROM masterip_details WHERE timedate(datetime) = CURDATE() and ip_address='$ip_address' ");

Answer 4

You keep getting that error because your query is wrong:

mysql_query("SELECT * FROM masterip_details WHERE timedate(datetime) = CURDATE() and ip_address='$ip_address"

is missing a quote after $ip_address

Answer 5

you are missing a single quote here and ip_address='$ip_address'")

Take a look at this: Why shouldn't I use mysql_* functions in PHP?

Answer 6

("SELECT * FROM masterip_details WHERE timedate(datetime) = CURDATE() AND ip_address='$ip_address'")

You missed an ' at the end of your SQL-Statement and you should write "AND" uppercased, since all other SQL-Keywords are written uppercased (not essential, but easier to read).

Maybe the missing ' will fix your Query.