Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given i

eyobassey · January 5, 2009

Please can someone help me out... when i run my program i have this error message;

"Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in C:\wamp\www\collegepro1.3\parent_report_sheet.php on line 240"

Please find below the codes:

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

<head>

<title>:: WELCOME TO THE SCHOOL MANAGEMENT SYSTEM ::</title>

<!--

#Layer1 {

position:absolute;

width:215px;

height:139px;

z-index:1;

left: 453px;

top: 287px;

background-color: #CC9900;

}

#Layer2 {

position:absolute;

width:217px;

height:32px;

z-index:2;

left: 451px;

top: 251px;

background-color: #333399;

}

#Layer3 {

position:absolute;

width:619px;

height:154px;

z-index:3;

left: 254px;

top: 26px;

}

#Layer4 {

position:absolute;

width:724px;

height:649px;

z-index:1;

background-color: #CCCCCC;

left: 202px;

top: 1px;

}

#Layer5 {

position:absolute;

width:721px;

height:22px;

z-index:1;

top: 98px;

left: 2px;

background-color: #99CC99;

}

#Layer6 {

position:absolute;

width:721px;

height:31px;

z-index:2;

top: 136px;

left: 8px;

background-color: #336699;

}

#Layer7 {

position:absolute;

width:158px;

height:504px;

z-index:3;

left: 8px;

top: 173px;

background-color: #006633;

}

#Layer8 {

position:absolute;

width:517px;

height:115px;

z-index:4;

left: 170px;

top: 20px;

}

-->

</style>

</head>

<body>

<?php

session_start();

if (session_id() !=($_SESSION["Sess_ses"]) || ($_SESSION["w_use_typ"]) != 'C'){

header("Location: default_to_entergrade.php");

}

//*

// contacts_menu.php

// Contacts Section

// Main Menu

//*

//Check if contact is logged in

session_start();

if(!session_is_registered('UserId') || $_SESSION['UserType'] != "C")

{

header ("Location: index.php?action=notauth");

exit;

}

?>

<?php

function Set_criteria($all){

$result = "";

$id = $all["student"];

$term = $all["term"];

$session = $all["session"];

if($id=="" || $term == "" || $session == ""){

$result = "error";

}

if($id != "" && $term != "" && $session != ""){

$_SESSION['nam_id'] = $id;

$_SESSION['term'] = $term;

$_SESSION['sess'] = $session;

$mycon = mysqli_connect("localhost","wfuser","wfpass","palasis");

$get_sql = "

Select

concat(studentbio.studentbio_lname,studentbio.studentbio_fname,studentbio.studentbio_mi) as Name

from studentbio Where studentbio_internalid = '".$id."'";

$get_res = mysqli_query($mycon, $get_sql) or die(mysqli_error($mycon));

if(mysqli_num_rows($get_res) <= 0){

$result = "empty";

}

if(mysqli_num_rows($get_res) >= 1){

$result = $get_res;

}

mysqli_close($mycon);

return $result;

}

//end of function set-criteria

$tname = $_SESSION["w_userna"];

$parid = $_SESSION["w_relid"];

$mycon = mysqli_connect("localhost","wfuser","wfpass","palasis");

$display_welcome_name = " <b><font size=\+2 color=\"#FFFFFF\">Welcome $tname</font></b>";

$display_date = "<font color=\"#FFFFFF\"><b>".date("l F jS\, Y.")."</b></font>";

$display_block = "

<tr>

<td>

<option value=\"\">-Select Ward's Name-</option>";

//$get_sql = "Select ward_name, ward_id from ward_parent where ward_contact_id = ".$t_id."";

$get_sql = "select studentbio_internalid, studentbio_id, concat(studentbio_lname, studentbio_fname) as ward_name from studentbio where studentbio_primarycontact = '".$parid."' order by studentbio_fname";

$get_res = mysqli_query($mycon, $get_sql) or die(mysqli_error($mycon));

while ($get_array = mysqli_fetch_array($get_res)){

$w_nam = $get_array['ward_name'];

$w_id = $get_array['studentbio_internalid'];

$display_block .="<option value=\"".$w_id."\">".

$w_nam."</option>";

}

$display_block .= "</select>

<option value=\"\">-Select Term-</option>";

$get_sql = "Select grade_terms_desc from grade_terms order by grade_terms_desc asc";

$get_res = mysqli_query($mycon, $get_sql) or die(mysqli_error($mycon));

while ($get_array = mysqli_fetch_array($get_res)){

$cat = $get_array['grade_terms_desc'];

$display_block .="<option value=\"".$cat."\">".

$cat."</option>";

}

$display_block .= "</select>

<option value=\"\">-Select Session-</option>";

$get_sql = "Select school_years_desc from school_years order by school_years_id desc";

$get_res = mysqli_query($mycon, $get_sql) or die(mysqli_error($mycon));

while ($get_array = mysqli_fetch_array($get_res)){

$cat = $get_array['school_years_desc'];

$display_block .="<option value=\"".$cat."\">".

$cat."</option>";

}

$display_block .= "</select>

</td>

</tr>

</table>

</form>";

if($_POST){

$all_post = $_POST;

$get_list = Set_criteria($all_post);

}

if($get_list == 'error'){

$display_list = "<font Color=\"#990000\"> Please ensure selection is made from ALL the drop-downs</font>";

}

if($get_list == 'empty'){

$display_list = "<font Color=\"#990000\"> No reports available yet.</font>";

}

if(mysqli_num_rows($get_list) >= 1){

$get = mysqli_query($mycon,"Select * from result_handler Where student_internalid = '".$_SESSION['nam_id']."' AND term = '".$_SESSION['term']."' AND school_year = '".$_SESSION['sess']."'");

$class = mysqli_fetch_array($get);

$grad = $class['grades_desc'];

$arm = $class['grades_arm'];

$name = $class['student_name'];

if(($grad == 'S.S. 1 ' )|| ($grad == 'S.S. 2 ') || ($grad == 'S.S. 3 ')){

$getpage = 'Performance_report_senior.php';

}else{

$getpage = 'Performance_report_junior.php';

}

while ($get_array = mysqli_fetch_array($get_list)){

$num = $num + 1;

$name = $get_array['Name'];

$display_list .= "

<tr>

<td bgcolor=\"#FFFFFF\" align=\"left\" ><font size=\"-1\"> ".$_SESSION["sess"]."</font></td>

<td bgcolor=\"#FFFFFF\" align=\"left\" ><font size=\"-1\"> ".$_SESSION["term"]."</font></td>

</tr>";

}

"</table>

</form>";

mysqli_close($mycon);

}

?>

<tr><td width="40%"> <?php echo "$display_date"; ?></td><td width="30%"><font color="#FFFFFF" size="+1"><b>VIEW REPORT SHEET</b></font></td><td width="30%"><?php echo "$display_welcome_name"; ?></td></tr></table>

<tr><td width="35%"> <font color="#FFFFFF">[select Name, Term, Session and click Generate]</font></td>

</tr></table>

</tr>

<tr>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Attendance Notes</b></font></a></td>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Discipline Notes</b></font></a></td>

</tr>

<td valign=center align=center><a href="parent_vw_sheet.php"><font color="#FFFFFF"><b>Performance Report</b></font></a></td>

</tr>

<td valign=center align=center><a href="parent_report_sheet.php"><font color="#FFFFFF"><b>Report Sheet</b></font></a></td>

</tr>

<tr>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Homework</b></font></a></td>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Forum</b></font></a></td>

</tr>

</tr>

<tr>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Timetable</b></font></a></td>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Health</b></font></a></td>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Exams and Tests</b></font></a></td>

</tr>

<td valign=center align=center><a href="#"><font color="#FFFFFF"><b>Change Password</b></font></a></td>

</tr>

<tr>

</tr>

<td valign=center align=center><a href="logout.php"><font color="#FFFFFF"><b>Logout</b></font></a></td>

</tr>

</tbody>

</table>

</div>

</body>

</html>

KevinM1 · January 5, 2009

The error message is pretty clear in its meaning. In order to use mysqli_num_rows(), the first argument passed into it must be a mysqli_result. What is that? The result of a database query.

What does your Set_criteria() function do? I'm willing to bet it doesn't return a mysqli_result.

eyobassey · January 5, 2009

wht then do u advice? i need practical steps.

Thanks alot

KevinM1 · January 5, 2009

wht then do u advice? i need practical steps.

Thanks alot

Well, the 'simplest' thing to do would be to ensure that your Set_criteria() function returns a mysqli_result that mysqli_num_rows() can read.

What does Set_criteria() do?

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