Error, query failed. No database selected

cancaseiro · April 9, 2007

Code is:

<?php

// include the database configuration and

// open connection to database

include 'kylaconnect.php';

include 'connect_to_MySQL.php';

// check if the form is submitted

if(isset($_POST['btnSign']))

{

// get the input from $_POST variable

// trim all input to remove extra spaces

$name = trim($_POST['txtName']);

$email = trim($_POST['txtEmail']);

$url = trim($_POST['txtUrl']);

$message = trim($_POST['mtxMessage']);

// escape the message ( if it's not already escaped )

if(!get_magic_quotes_gpc())

{

$name = addslashes($name);

$message = addslashes($message);

}

// if the visitor do not enter the url

// set $url to an empty string

if ($url == 'http://')

{

$url = '';

}

// prepare the query string

$query = "INSERT INTO guestbook (name, email, url, message, entry_date) " .

"VALUES ('$name', '$email', '$url', '$message', current_date)";

// execute the query to insert the input to database

// if query fail the script will terminate

mysql_query($query) or die('Error, query failed. ' . mysql_error());

// redirect to current page so if we click the refresh button

// the form won't be resubmitted ( as that would make duplicate entries )

header('Location: ' . $_SERVER['REQUEST_URI']);

// force to quite the script. if we don't call exit the script may

// continue before the page is redirected

exit;

}

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Kylalisteraamat</title>

/*

This function is called when

the 'Sign Guestbook' button is pressed

Output : true if all input are correct, false otherwise

*/

function checkForm()

{

// the variables below are assigned to each

// form input

var gname, gemail, gurl, gmessage;

with(window.document.guestform)

{

gname = txtName;

gemail = txtEmail;

gurl = txtUrl;

gmessage = mtxMessage;

}

// if name is empty alert the visitor

if(trim(gname.value) == '')

{

alert('Please enter your name');

gname.focus();

return false;

}

// alert the visitor if email is empty or the format is not correct

else if(trim(gemail.value) != '' && !isEmail(trim(gemail.value)))

{

alert('Please enter a valid email address or leave it blank');

gemail.focus();

return false;

}

// alert the visitor if message is empty

else if(trim(gmessage.value) == '')

{

alert('Please enter your message');

gmessage.focus();

return false;

}

else

{

// when all input are correct

// return true so the form will submit

return true;

}

/*

Strip whitespace from the beginning and end of a string

Input : a string

Output : the trimmed string

*/

function trim(str)

{

return str.replace(/^\s+|\s+$/g,'');

}

/*

Check if a string is in valid email format.

Input : the string to check

Output : true if the string is a valid email address, false otherwise.

*/

function isEmail(str)

{

var regex = /^[-_.a-z0-9]+@(([-a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;

return regex.test(str);

}

</script>

</head>

<body>

<tr>

</tr>

<tr>

<td width="100">Email</td>

<td>

</tr>

<tr>

<td width="100">Website URL</td>

<td>

</tr>

<tr>

<td width="100">Message</td> <td>

</tr>

<tr>

<td>

</tr>

</table>

</form>

<br>

<?php

// =======================

// Show guestbook entries

// =======================

// how many guestbook entries to show per page

$rowsPerPage = 20;

// by default we show first page

$pageNum = 1;

// if $_GET['page'] defined, use the value as page number

if(isset($_GET['page']))

{

$pageNum = $_GET['page'];

}

// counting the offset ( where to start fetching the entries )

$offset = ($pageNum - 1) * $rowsPerPage;

// prepare the query string

$query = "SELECT id, name, email, url, message, DATE_FORMAT(entry_date, '%d.%m.%Y') ".

"FROM guestbook ".

"ORDER BY id DESC ". // using ORDER BY to show the most current entry first

"LIMIT $offset, $rowsPerPage"; // LIMIT is the core of paging

// execute the query

$result = mysql_query($query) or die('Error, query failed. ' . mysql_error());

// if the guestbook is empty show a message

if(mysql_num_rows($result) == 0)

{

?>

<p><br>

<br>Guestbook is empty </p>

<?php

}

else

{

// get all guestbook entries

while($row = mysql_fetch_array($result))

{

// list() is a convenient way of assign a list of variables

// from an array values

list($id, $name, $email, $url, $message, $date) = $row;

// change all HTML special characters,

// to prevent some nasty code injection

$name = htmlspecialchars($name);

$message = htmlspecialchars($message);

// convert newline characters ( \n OR \r OR both ) to HTML break tag ( <br> )

$message = nl2br($message);

?>

<tr>

<td width="80" align="left"> <a href="mailto:<?=$email;?>" class="email">

<?=$name;?>

</a> </td>

<?=$date;?>

</small></td>

</tr>

<tr>

<?=$message;?>

<?php

// if the visitor input her homepage url show it

if($url != '')

{

// make the url clickable by formatting it as HTML link

$url = "<a href='$url' target='_blank'>$url</a>";

?>

<br> <small>Homepage : <?=$url;?></small>

<?php

}

?>

</td>

</tr>

</table>

<br>

<?php

} // end while

// below is the code needed to show page numbers

// count how many rows we have in database

$query = "SELECT COUNT(id) AS numrows FROM guestbook";

$result = mysql_query($query) or die('Error, query failed. ' . mysql_error());

$row = mysql_fetch_array($result, MYSQL_ASSOC);

$numrows = $row['numrows'];

// how many pages we have when using paging?

$maxPage = ceil($numrows/$rowsPerPage);

$nextLink = '';

// show the link to more pages ONLY IF there are

// more than one page

if($maxPage > 1)

{

// this page's path

$self = $_SERVER['PHP_SELF'];

// we save each link in this array

$nextLink = array();

// create the link to browse from page 1 to page $maxPage

for($page = 1; $page <= $maxPage; $page++)

{

$nextLink[] = "<a href=\"$self?page=$page\">$page</a>";

}

// join all the link using implode()

$nextLink = "Go to page : " . implode(' » ', $nextLink);

}

// close the database connection since

// we no longer need it

include 'library/closedb.php';

?>

<tr>

<?=$nextLink;?>

</td>

</tr>

</table>

<?php

}

?>

</body>

</html>

How can I get rid of this Error? What should I do?

MadTechie · April 9, 2007

PLEASE POST code within the [ code] tags

also No database selected means you don't have

<?php
@mysql_select_db($db, $id) or
            MySQL_ErrorMsg ("Unable to select database: $db");

?>

or even

<?php
$id = @mysql_pconnect($host, $user, $pass) or
MySQL_ErrorMsg("Unable to connect to MySQL server: $host : '$SERVER_NAME'");

?>

from what i can see

cancaseiro · April 9, 2007

OK, thanks, I will try it and will use

next time.

cancaseiro · April 9, 2007

Where in my code should I put it?

Sign In

Error, query failed. No database selected

Recommended Posts

cancaseiro

Link to comment

Share on other sites

MadTechie

Link to comment

Share on other sites

cancaseiro

Link to comment

Share on other sites

cancaseiro

Link to comment

Share on other sites

Archived

Browse

Activity

Important Information