PHP - Getting Result From A Select Sum If Query

Hello all,   Based on the suggestion of you wonderful folks here, I went away for a few days (to learn about PDO and Prepared Statements) in order to replace the MySQLi commands in my code. That's gone pretty well thus far...with me having learnt and successfully replaced most of my "bad" code with elegant, SQL-Injection-proof code (or so I hope).   The one-and-only problem I'm having (for now at least) is that I'm having trouble understanding how to execute an UPDATE query within the resultset of a SELECT query (using PDO and prepared statements, of course).   Let me explain (my scenario), and since a picture speaks a thousand words I've also inlcuded a screenshot to show you guys my setup:   In my table I have two columns (which are essentially flags i.e. Y/N), one for "items alreay purchased" and the other for "items to be purchased later". The first flag, if/when set ON (Y) will highlight row(s) in red...and the second flag will highlight row(s) in blue (when set ON).   I initially had four buttons, two each for setting the flags/columns to "Y", and another two to reverse the columns/flags to "N". That was when I had my delete functionality as a separate operation on a separate tab/list item, and that was fine.   Now that I've realized I can include both operations (update and delete) on just the one tab, I've also figured it would be better to pare down those four buttons (into just two), and set them up as a toggle feature i.e. if the value is currently "Y" then the button will set it to "N", and vice versa.   So, looking at my attached picture, if a person selects (using the checkboxes) the first four rows and clicks the first button (labeled "Toggle selected items as Purchased/Not Purchased") then the following must happen:   1. The purchased_flag for rows # 2 and 4 must be switched OFF (set to N)...so they will no longer be highlighted in red. 2. The purchased_flag for row # 3 must be switched ON (set to Y)...so that row will now be highlighted in red. 3. Nothing must be done to rows # 1 and 5 since: a) row 5 was not selected/checked to begin with, and b) row # 1 has its purchase_later_flag set ON (to Y), so it must be skipped over.   Looking at my code below, I'm guessing (and here's where I need the help) that there's something wrong in the code within the section that says "/*** loop through the results/collection of checked items ***/". I've probably made it more complex than it should be, and that's due to the fact that I have no idea what I'm doing (or rather, how I should be doing it), and this has driven me insane for the last 2 days...which prompted me to "throw in the towel" and seek the help of you very helpful and intellegent folks. BTW, I am a newbie at this, so if I could be provided the exact code, that would be most wonderful, and much highly appreciated.   Thanks to you folks, I'm feeling real good (with a great sense of achievement) after having come here and got the great advice to learn PDO and prepared statements.   Just this one nasty little hurdle is stopping me from getting to "end-of-job" on my very first WebApp. BTW, sorry about the long post...this is the best/only way I could clearly explaing my situation.   Cheers guys!

case "update-delete":
	if(isset($_POST['highlight-purchased'])) 
		{
			// ****** Setup customized query to obtain only items that are checked ******
			$sql = "SELECT * FROM shoplist WHERE";
					for($i=0; $i < count($_POST['checkboxes']); $i++)
						{
							$sql=$sql . " idnumber=" . $_POST['checkboxes'][$i] . " or";
						}
					$sql= rtrim($sql, "or");
											
			$statement = $conn->prepare($sql);
			$statement->execute();
																						
			// *** fetch results for all checked items (1st query) *** //
			$result = $statement->fetchAll();

			$statement->closeCursor();
											
			// Setup query that will change the purchased flag to "N", if it's currently set to "Y"
			$sqlSetToN = "UPDATE shoplist SET purchased = 'N' WHERE purchased = 'Y'";
											
			// Setup query that will change the purchased flag to "Y", if it's currently set to "N", "", or NULL
			$sqlSetToY = "UPDATE shoplist SET purchased = 'Y' WHERE purchased = 'N' OR purchased = '' OR purchased IS NULL";

			$statementSetToN = $conn->prepare($sqlSetToN);
			$statementSetToY = $conn->prepare($sqlSetToY);
											
			/*** loop through the results/collection of checked items ***/
			foreach($result as $row)
				{
					if ($row["purchased"] != "Y")
						{
							// *** fetch one row at a time pertaining to the 2nd query *** //
							$resultSetToY = $statementSetToY->fetch();
															
							foreach($resultSetToY as $row)
								{															
									$statementSetToY->execute();																
								}
						}
					else
						{
							// *** fetch one row at a time pertaining to the 2nd query *** //
							$resultSetToN = $statementSetToN->fetch();
															
							foreach($resultSetToN as $row)
								{															
									$statementSetToN->execute();																
								}
						}
				}
				break;
		}

 CRUD Queston.png   20.68KB   0 downloads    

Okay so, I'm adding a reply feature to my text-board, and I'm wondering how I can select a single result from the DB
I've tried this
$board = mysql_real_escape_string($_GET['board']);
$thread = mysql_real_escape_string($_GET['thread']);

$result = mysql_query("SELECT subject, name, id, timestamp, body FROM $board LIMIT $thread,$thread");
while ($row = mysql_fetch_array($result, MYSQL_NUM)) {
    printf("<div id='html1' style='background-color:#F0E0D6;border:solid 1px #800000;font-family:arial; font-size: 12px; padding:2px; margin:2px;'><font color='#CC1105'>%s </font><font color='#117743'>%s</font> <font color='#800000'>Post # %s - %s<br />%s<br /></div>", $row[0], $row[1], $row[2], $row[3], $row[4], $row[5], $row[6]);
mysql_free_result($result);
}
?>
Kinda works but if I pu
?thread=56
then it would show thread 57, which in this example does not exist.

 $result = mysql_query("SELECT *  FROM `friend_system` WHERE `friend_system_accepter` = '$myusername' ");
echo mysql_num_rows($result);

This displays the total rows in the table.

$result = mysql_query("SELECT COUNT(friend_system_accepter)  FROM `friend_system` WHERE `friend_system_accepter` = '$myusername' ");
echo mysql_num_rows($result);

This displays '1', which is incorrect.   I want to echo out the number of rows where 'friend_system_accepter' = $myusername   Thanks

Hello.   I'm having some issues with a select statement containing ABS(). Here's the select query:

"SELECT gadenavn, husnr, ABS(husnr - $husnr) AS husnr_range, postnr,db, shaping, dsl_node, ctr_node, db_ctr_luftlinje, bynavn FROM `TABLE 1`, Post_numre WHERE `postnr`=`postnummer` AND `gadenavn`=`$vejnavn` AND `postnr`=`$postnr` AND `husnr`>0 ORDER BY husnr_range ASC LIMIT 5"

Now lets asume my variable "$husnr" is a value of 15. In my table I have the values for coulmn "husnr":   13,12,11,10,9   What really bugs me is the outcome doing af simple "while loop"  is returning the values 12,11,10,9.   What happened to 13?!   printing the "husnr_range" values shows "3,4,5,6".   What puzzles is the row missing, as I only get 4 results, with a "LIMIT 5".   Can anyone explain why the last resulst isn't included?

Hello all.   I am using a premade login script which has some very powerful function built in, the one I am looking at using is as follows:

  /** 
    * query - Performs the given query on the database and 
    * returns the result, which may be false, true or a 
    * resource identifier. 
    */ 
   function query($query){ 
      return mysqli_query( $this->connection, $query); 
   } 

The issue is, displaying the results.  I call is via the following code:

$database->query('SELECT LastName, Firstname FROM Patrons WHERE LastName = "Delude"');

But I have no idea how to display it.  I have attempted to echo it out, but I get the following error in the logs:   PHP Catchable fatal error:  Object of class mysqli_result could not be converted to string