If SQL returns no queries - php

Question

I have this piece of code:
require_once('connectvars2.php'); //This is the connection to my database
$data = mysql_query("SELECT * FROM calzone ORDER BY id DESC");
if (isset($_POST['submit'])) {
$post = trim($_POST['post']);
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
if (!(empty($data))) { // This is my poor attempt :-)
echo 'No result!';
}
}
This is my search function on my website.
I want it to return something if there is no queries which match the searchwords. Say if I write "6737" and the database finds no results, it should print "Sorry, but there's no results for your search!".
Is there a way for MySQL to check if there was returned any queries? and if not, echo some text?

Answer 1

Use mysql_num_rows
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
if(mysql_num_rows($data) > 0){
//show your data
}
else{
echo "Sorry, but there are no results for your search!";
}
Also, as mentioned, mysql_query is deprecated. Switch to PDO.

Answer 2

Use mysql_num_rows function to count no. of rows..
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
$num=mysql_num_rows($data);
if($num==0)
{
echo 'Sorry, but theres no results for your search';
}

Answer 3

require_once('connectvars2.php'); //This is the connection to my database
$data = mysql_query("SELECT * FROM calzone ORDER BY id DESC");
if (isset($_POST['submit'])) {
$post = trim($_POST['post']);
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
if (mysql_num_rows($data) == 0){
echo "Sorry, but there's no results for your search!";
}else{
echo "matched";
}
}

Answer 4

use
if(mysql_num_rows($data)==0){
echo "Sorry, but there's no results for your search";
}

Answer 5

you are probably looking for mysql_num_rows
Use like this
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
if (mysql_num_rows($data) == 0) {
echo 'No result!';
}
On a side note; you are using the mysql_XX functions to access the database. These have been replace with Mysqli and MySQL(PDO). Use one of these upto date libraries.

Answer 6

use mysql_num_rows($data)==0
Although you should use mysqli and not mysql as mysql is deprecated nowadays

Answer 7

First of all, you should not use mysql_-functions cause this PHP extension is deprecated. Try to use PDO or Mysqli extension instead.
By the way in this extension there is mysql_num_rows function which does exactly what you want.
$data = mysql_query("SELECT * FROM calzone WHERE overskrift LIKE '%$post%' OR postnummer = '$post'");
if (!mysql_num_rows($data)) {
echo 'No result!';
}

Answer 8

Use http://www.php.net/manual/en/function.mysql-num-rows.php
$result = mysql_query("SELECT * FROM table1", $link);
$num_rows = mysql_num_rows($result);
echo "$num_rows Rows\n";