I have the following code
$sql = "SET #uid := (SELECT ID FROM channels WHERE Used = 0 ORDER BY RAND() LIMIT 1);";
$sql = "UPDATE channels SET Used = 1 WHERE ID = #uid;";
$sql = "SELECT * FROM channels WHERE ID IN = #uid;";
$result = mysqli_multi_query($conn, $sql)
or die( mysqli_error($sql) );
if (mysqli_num_rows($result) > 0) {
$text = '';
while($row = mysqli_fetch_assoc($result)) {
$Channel_Location = $row['Channel_Location'];
$text = $text . $Channel_Location;
}
}
Now the issue i'm having is the php isnt displaying the result returned by the MYSQL query which is stored in a session later on in the code to be displayed on a dummy page it comes up with the following error
Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result
The my SQL query does exactly what I need it to I just need to, so I don't really want to change it. I just need some advice on how i'd get the PHP to echo the #uid
is there anyone willing to help me solve the issue? if so thankyou.
You have 3 queries in your $sql so you should use multi_query function
http://php.net/manual/en/mysqli.multi-query.php
And you can change your first query to:
SET #uid = 0;
SELECT #uid := ID FROM channels WHERE Used = 0 ORDER BY RAND() LIMIT 1);
Update You can try this fragment of your code modified with all commented improvements.
$sql = 'SET #uid = 0;';
$sql .= 'SELECT #uid:= ID FROM channels WHERE Used = 0 ORDER BY RAND() LIMIT 1);';
$sql .= 'UPDATE channels SET Used = 1 WHERE ID = #uid;';
$sql .= 'SELECT * FROM channels WHERE ID IN = #uid;';
if (mysqli_multi_query($conn, $sql)) {
do {
$result = mysqli_store_result($conn);
} while(mysqli_next_result($conn));
if (mysqli_num_rows($result) > 0) {
$text = '';
while($row = mysqli_fetch_assoc($result)) {
$Channel_Location = $row['Channel_Location'];
$text = $text . $Channel_Location;
}
}
} else {
die( mysqli_error($conn) );
}
I executed 4 count queries from one table. but I am getting the same output from all the queries. but the actual value is different in the table.
Here is my table.
ID || notify_type || status
__________________________________________
1 || resume_uploaded || 1
Here are my queries:
$notify_query1 = "select count(*) from notify where status = 1 and notify_type = 'resume_uploaded'";
$row1 = mysqli_query($db_manager->connection,$notify_query1);
$rcount = mysqli_num_rows($row1);
$notify_query2 = "select count(*) from notify where status = 1 and notify_type = 'detail_filled'";
$row2 = mysqli_query($db_manager->connection,$notify_query2);
$dcount = mysqli_num_rows($row2);
$notify_query3 = "select count(*) from notify where status = 1 and notify_type = 'job_detailed'";
$row3 = mysqli_query($db_manager->connection,$notify_query3);
$jcount = mysqli_num_rows($row3);
$notify_query4 = "select count(*) from notify where status = 1 and notify_type = 'msg_sent'";
$row4 = mysqli_query($db_manager->connection,$notify_query4);
$mcount = mysqli_num_rows($row4);
I am getting output 1 from all the four queries:
Please help me.
Use fetch_row() instead mysqli_num_rows().
$result = $db->query("select count(*) from notify where status = 1 and notify_type = 'resume_uploaded'");
$row = $result->fetch_row();
echo 'No of count: '. $row[0];
I am trying to get a random row from MySQL table but all three attemps:
$query = "SELECT cid FROM table LIMIT 1 OFFSET ".rand(1,$num_rows);
$query = "SELECT cid FROM table OFFSET RANDOM() * (SELECT COUNT(*) FROM table) LIMIT 1";
$query = "SELECT * FROM table ORDER BY RAND() LIMIT 1";
give a NULL result in mysql_query($query).
Higher up my PHP code I obtain a row from the same table OK by specifying WHERE, so I don't understand why I can't retrieve a random one.
Here is the code snippet:
$query = "SELECT uid,clu FROM uable WHERE un = '$un'";
$result = mysql_query($query) or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
$resultid = mysql_fetch_assoc($result);
$uid = $resultid['uid'];
file_put_contents('debugging.txt',__LINE__.' - $uid = '.var_export($uid,true).PHP_EOL,FILE_APPEND);
$query = "SELECT * FROM table WHERE uid = $uid AND cn = '$cn'";
$result = mysql_query($query) or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
$cr = mysql_fetch_assoc($result);
$cid= $cr['cid'];
file_put_contents('debugging.txt',__LINE__.' - $cid= '.var_export($cid,true).PHP_EOL,FILE_APPEND);
$query = "SELECT * FROM fable WHERE cid= '$cid'";
$result = mysql_query($query) or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
file_put_contents('debugging.txt',__LINE__.' - $result = '.var_export($result,true).PHP_EOL,FILE_APPEND);
$fr = mysql_fetch_assoc($result);
file_put_contents('debugging.txt',__LINE__.' - $fr = '.var_export($fr,true).PHP_EOL,FILE_APPEND);
echo '<form action="'.$_SERVER['PHP_SELF'].’" method="post">';
if (!$fr) {
$o= $cn;
while ($o= $cn) {
// $ac = mysql_query("SELECT * FROM table") or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
// $num_rows = mysql_num_rows($ac);
//file_put_contents('debugging.txt',__LINE__.' - $num_rows = '.$num_rows.PHP_EOL,FILE_APPEND);
// --$num_rows;
// $query = "SELECT cid FROM table LIMIT 1 OFFSET ".rand(1,$num_rows);
$query = "SELECT cid FROM table OFFSET RANDOM() * (SELECT COUNT(*) FROM table) LIMIT 1";
// $query = "SELECT * FROM table ORDER BY RAND() LIMIT 1";
$resultid = mysql_query($query) or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
$opr = mysql_fetch_assoc($resultid);
$o= $opr['cn'];
}
file_put_contents('debugging.txt',__LINE__.' - $query = '.$query.PHP_EOL,FILE_APPEND);
file_put_contents('debugging.txt',__LINE__.' - $resultid = '.var_export($resultid,true).PHP_EOL,FILE_APPEND);
file_put_contents('debugging.txt',__LINE__.' - $op[\'cid\'] = '.$op['cid'].PHP_EOL,FILE_APPEND);
$query = "SELECT * FROM table WHERE cid= ".$op;
$result = mysql_query($query) or die(sqlerror(__LINE__,mysql_errno(),mysql_error()));
$opr = mysql_fetch_assoc($opr);
$o= $opr['cn'];
$od= $opr['description'];
echo '<p>'.$op;
if ($od<> '') {
echo ','.$odesc;
}
echo '</p>';
echo '<input type="submit" name="continue" id="continue" value="Continue">';
} else {
echo '<p>'.$fr['p'].'</p>';
echo '<input type="submit" name="continue" id="continue" value="Continue">';
}
echo '</form>';
The resulting debugging.txt:
24 - $uid = '4'
29 - $cid = '21'
32 - $result = NULL
34 - $fr = false
These queries look OK, but I think you're starting at the wrong place. When you're uncertain how to frame something in SQL, open up a SQL client like SequelPro or Navicat and try writing a few queries by hand until you get the result you want. (Also this gives you a chance to double-check the contents of relevant tables and ensure the expected data are there.) Then you can go back into the PHP with full confidence that the SQL code is correct, so if there's a problem it must be with the PHP (either the variables you inject into a Mysql statement, or the way you call that statement).
Im trying to count all rows and get a number of those that are not empty.
require_once 'db_conx.php';
$sql = "SELECT COUNT(*) FROM ads";
$result = mysql_query($sql, $con) or trigger_error("SQL", E_USER_ERROR);
$r = mysql_fetch_row($result);
$numrows = $r[0];
$PQR = (!empty($row['position'])) ? $numrows : '';
echo $PQR;
How about getting only the ones, you need?
SELECT COUNT(*) FROM ads WHERE position IS NOT NULL or position != '';
$numrows = mysql_numrows( $result );
I am trying to show a count but only where the column deleted is equal to 0
here is what i have tried
$result=mysql_query("SELECT * FROM users where deleted=0")or die('Error ' );
$counter = mysql_query("SELECT COUNT(*) as personID FROM users");
$row = mysql_fetch_array($result);
$personID = $row['personID'];
$personFname = $row['personFname'];
$personSname = $row['personSname'] ;
$llmail = $row['llmail'];
$mainadmin = $row['mainadmin'];
$delete = $row['delete'];
$num = mysql_fetch_array($counter);
$count1 = $num["personID"];
This shows a count of 4 however of the 4, 2 are deleted so it should only show 2 if this makes sense?
SELECT COUNT(*) as personID FROM users WHERE deleted=0