Create Ranking base system and updating Rank [duplicate] - php

Question

This question already has answers here:
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource
(31 answers)
Closed 8 years ago.
Guys I'm new here and new to MySQL too ..
So I am trying to create a database which manages a team record.The database contains a table named team with a set of columns as follow,
TeamID
TeamRank
TeamName
TeamWins
TeamLoss
TeamPoints
So the agenda is to rank the teams on the basis of points, the greater the points higher the rank.
<?php
$con = mysqli_connect("", "", "", "");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con, "SET #rownum := 0;
INSERT INTO team( TeamRank, TeamName)
SELECT #rownum := #rownum + 1 AS TeamRank, TeamName
FROM (SELECT SUM(TeamRank)AS TeamRank , TeamName
FROM team
GROUP BY TeamName
ORDER BY TeamRank DESC) as result
ON DUPLICATE KEY UPDATE TeamName = VALUES(TeamName);"
);
echo "<table border='1'>
<tr>
<th>Rank</th>
<th>TeamID</th>
<th>TeamName</th>
<th>Total Points</th>
</tr>";
while ($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['TeamRank'] . "</td>";
echo "<td>" . $row['TeamID'] . "</td>";
echo "<td>" . $row['TeamName'] . "</td>";
echo "<td>" . $row['TeamPoints'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
Im recieveing this Error
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result
Where am I Wrong? If there a problem with the code please guide me.
P.S[EDIT]: All I want to do is take TeamName,TeamWins,TeamLoss and TeamPoints as input, and as the TeamPoints increase/decrease of a team its supposed to move the rank upwards/downwards and display a Ranking table.

Answer 1

You are using mysqli_query for multi query. so you have to use mysqli_multi_query.
change your code to:
<?php
$con=mysqli_connect("","","","");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query="SET #rownum := 0;
INSERT INTO team( TeamRank, TeamName)
SELECT #rownum := #rownum + 1 AS TeamRank, TeamName
FROM (SELECT SUM(TeamRank)AS TeamRank , TeamName
FROM team
GROUP BY TeamName
ORDER BY TeamRank DESC) as result
ON DUPLICATE KEY UPDATE TeamName = VALUES(TeamName);
";
echo "<table border='1'>
<tr>
<th>Rank</th>
<th>TeamID</th>
<th>TeamName</th>
<th>Total Points</th>
</tr>";
if (mysqli_multi_query($con,$query)) {
do {
/* store first result set */
if ($result = mysqli_store_result($con)) {
while ($row = mysqli_fetch_row($result)) {
echo "<tr>";
echo "<td>" . $row['TeamRank'] . "</td>";
echo "<td>" . $row['TeamID'] . "</td>";
echo "<td>" . $row['TeamName'] . "</td>";
echo "<td>" . $row['TeamPoints'] . "</td>";
echo "</tr>";
}
mysqli_free_result($result);
}
} while (mysqli_next_result($con));
}
echo "</table>";
mysqli_close($con);
?>