问题
I have an html form that users input data into that saves the values in two MySQL tables, invoices and lineitems. When the "save" button is clicked, these values are inserted as a new row in invoices and lineitems. The page refreshes to display the same form, but with the user-inputted values saved in the input fields. The webpage has multiply 'lineitems' the user can create. This data gets saved to the lineitems table. Each invoice row has a unique id that gets added to each lineitem the user creates. That way the invoice can get each lineitem associated with it from the lineitems table. I need to perform a sum calculation on lineitems.quantity for each invoice and save the value to invoices.totalquantity.
I have tried setting up triggers on the lineitems table itself, but it always fails. I am now trying to do it from the program side.
MY CODE:
// LINE ITEMS CLASS
// ==============================================================================================
class lineitems{
var $queryresult = NULL;
function lineitems($db, $invoiceid, $invoicetype = "Order"){
$this->db = $db;
$this->invoiceid = ((int) $invoiceid);
$this->invoicetype = $invoicetype;
}//end method
function get(){
$querystatement = "
SELECT
products.partname,
products.partnumber,
products.claveid,
products.claveid2,
products.layupid,
lineitems.id,
lineitems.productid,
lineitems.quantity,
lineitems.nipple,
lineitems.polish,
lineitems.edgeseal,
lineitems.leads,
lineitems.leadsl,
lineitems.width,
lineitems.widthf,
lineitems.height,
lineitems.heightf,
lineitems.comment
FROM
lineitems LEFT JOIN products ON lineitems.productid = products.id
WHERE
invoiceid = ".$this->invoiceid."
ORDER BY
lineitems.displayorder";
/*
FROM
lineitems LEFT JOIN products ON lineitems.productid = products.id
WHERE
invoiceid = ".$this->invoiceid."
ORDER BY
lineitems.displayorder"; */
$this->queryresult = $this->db->query($querystatement);
}//end method
function show(){
if($this->queryresult === NULL)
$this->get();
$count = 1;
while($therecord = $this->db->fetchArray($this->queryresult)){
?><tr id="li<?php echo $count?>" class="lineitems">
<td colspan="2" class="lineitemsLeft" <?php if($this->invoicetype == "Void" || $this->invoicetype == "Invoice") echo 'nowrap="nowrap"'?>>
<input type="hidden" id="li<?php echo $count?>ProductID" value="<?php echo $therecord["productid"]?>"/>
<div>
<?php if($therecord["partnumber"] || $therecord["partname"] ) {?>
<p><?php echo formatVariable($therecord["partnumber"]) ?></p>
<!-- <p class="important"><?//php echo formatVariable($therecord["partname"])?></p> -->
<?php } else
echo " ";
?>
</div>
</td>
<!-- <td><input id="li<?//php echo $count?>Memo" class="lineitemMemos" value="<?//php echo formatVariable($therecord["memo"])?>"/></td> -->
<!-- <td><input id="li<?////php echo $count?>Frontfinish" class="lineitemFrontfinishs" value="<?/////php echo formatVariable($therecord["frontfinish"])?>"/></td>
<td><input id="li<?////php echo $count?>Backfinish" class="lineitemBackfinishs" value="<?////php echo formatVariable($therecord["backfinish"])?>"/></td> -->
<td><input id="li<?php echo $count?>Comment" class="lineitemComments" value="<?php echo formatVariable($therecord["comment"])?>"/></td>
<td><input id="li<?php echo $count?>Nipple" class="lineitemNipples" value="<?php echo formatVariable($therecord["nipple"])?>"/></td>
<td><input id="li<?php echo $count?>Polish" class="lineitemPolishes" value="<?php echo formatVariable($therecord["polish"])?>"/></td>
<td><input id="li<?php echo $count?>Edgeseal" class="lineitemEdgeseals" value="<?php echo formatVariable($therecord["edgeseal"])?>"/></td>
<td><input id="li<?php echo $count?>Leads" class="lineitemLeadss" value="<?php echo $therecord["leads"]?>"/></td>
<td><input id="li<?php echo $count?>Leadsl" class="lineitemLeadsls" value="<?php echo $therecord["leadsl"]?>"/></td>
<!-- <td><input id="li<?///php echo $count?>RQ" class="lineitemRQs" value="<?///php echo $therecord["RQ"]?>"/></td> -->
<td><input id="li<?php echo $count?>Width" class="lineitemWidths" value="<?php echo $therecord["width"]?>"/></td>
<td> <input id="li<?php echo $count?>Widthf" class="lineitemWidthfs" value="<?php echo $therecord["widthf"]?>"/></td>
<td><input id="li<?php echo $count?>Height" class="lineitemHeights" value="<?php echo $therecord["height"]?>"/> </td>
<td> <input id="li<?php echo $count?>Heightf" class="lineitemHeightfs" value="<?php echo $therecord["heightf"]?>"/></td>
<!--
<td><input id="li<?///php echo $count?>Claveid" class="uneditable lineitemClaveids" value="<?////php echo formatVariable($therecord["claveid"])?>"/></td>
<td><input id="li<?////php echo $count?>Claveid2" class="uneditable lineitemClaveid2s" value="<?/////php echo formatVariable($therecord["claveid2"])?>"/></td>
-->
<td><input id="li<?php echo $count?>Quantity" class="lineitemQuantities" value="<?php echo formatVariable($therecord["quantity"])?>"/></td>
<td><input id="li<?php echo $count?>Sqft" class="uneditable lineitemSqfts" value="<?php echo formatVariable(ceil($therecord["width"]*$therecord["height"]/144)) ?>"/></td>
<td><input id="li<?php echo $count?>Sqfttot" class="uneditable lineitemSqfttots" value="<?php echo formatVariable (ceil($therecord["width"]*$therecord["height"]/144* $therecord["quantity"]))?>"/></td>
<!-- <td><input id="li<?///php echo $count?>unitweight" class=" uneditable lineitemUnitweight" value="<?///php echo $unitweight ?>"/></td> -->
<!-- <td><input id="li<?///php echo $count?>totalweight" class="uneditable lineitemTotalweight" value="<?///php echo $totalweight ?>"/></td> -->
<td class="lineitemsButtonTDs">
<div id="li<?php echo $count?>ButtonsDiv" class="lineitemsButtonDivs">
<button type="button" id="li<?php echo $count?>ButtonDelete" class="graphicButtons buttonMinus LIDelButtons" title="Remove line item"><span>-</span></button><br />
<button type="button" id="li<?php echo $count?>ButtonMoveUp" class="graphicButtons buttonUp LIUpButtons" title="Move Item Up"><span>Up</span></button><br />
<button type="button" id="li<?php echo $count?>ButtonMoveDown" class="graphicButtons buttonDown LIDnButtons" title="Move Item Down"><span>Dn</span></button><br />
</div>
</td>
</tr>
<?php
$count++;
}//endwhile
}//end method
function set($itemlist, $userid = NULL){
if(!$userid)
$userid = $_SESSION["userinfo"]["id"];
$deletestatement = "
DELETE FROM
lineitems
WHERE
invoiceid = ".$this->invoiceid;
$this->db->query($deletestatement);
$itemsArray = explode(";;", $itemlist);
$count = 0;
foreach($itemsArray as $item){
$itemRecord = explode("::", $item);
if(count($itemRecord) > 1){
$insertstatement ="
INSERT INTO
lineitems(
invoiceid,
productid,
comment,
nipple,
polish,
edgeseal,
leads,
leadsl,
width,
widthf,
height,
heightf,
quantity,
sqft,
sqfttot,
displayorder,
createdby,
creationdate,
modifiedby,
modifieddate
)
VALUES (
".$this->invoiceid.",
".((int) $itemRecord[0]).",
'".$itemRecord[1]."',
'".$itemRecord[2]."',
'".$itemRecord[3]."',
'".$itemRecord[4]."',
'".$itemRecord[5]."',
'".$itemRecord[6]."',
'".$itemRecord[7]."',
'".$itemRecord[8]."',
'".$itemRecord[9]."',
'".$itemRecord[10]."',
'".$itemRecord[11]."',
'".$itemRecord[12]."',
'".$itemRecord[13]."',
".$count.",
".$userid.",
NOW(),
".$userid.",
NOW()
)";
$this->db->query($insertstatement);
$count++;
}//end if
}//endforeach
}//end method
//this isn't actually updating my invoices table...
function updatesglitots() {
$sglitotalsupdate="UPDATE invoices i LEFT JOIN (SELECT invoiceid, SUM(quantity) AS sgtotqty FROM lineitems li GROUP BY invoiceid) AS t ON i.invoiceid = t.invoiceid SET i.totalquantity = t.sgtotqty WHERE i.invoiceid = ".$this->invoiceid."";
$this->db->query($sglitotalsupdate);
}
}//end class
}// end if
I want to do either something like this:
"UPDATE invoices
SET totalquantity = SUM('".$itemRecord[11]."')
WHERE invoices.id = ".$this->invoiceid."
;"
NOTE: '".$itemRecord[11]."' is the array value that holds the quantity for each lineitem a user creates.
OR...
"UPDATE invoices INNER JOIN lineitems
ON invoices.id=lineitems.invoiceid
SET invoices.totalquantity = SUM(lineitems.quantity)
WHERE invoices.id=lineitems.invoiceid
;"
Please help as I have tried several different methods...
Thank you!!
回答1:
You can use a correlated subquery, or join the invoices table to a derived table. After you have inserted all the line items, this will calculate the total.
"UPDATE invoices i
SET totalquantity = (
SELECT SUM(quantity)
FROM lineitems li
WHERE li.invoiceid = i.invoiceid)
WHERE i.invoiceid = " . $this->invoiceid;
// or
"UPDATE invoices i
LEFT JOIN
(SELECT invoiceid, SUM(quantity) AS total
FROM lineitems li
GROUP BY invoiceid) AS t
ON i.invoiceid = t.invoiceid
SET i.totalquantity = t.total
WHERE i.invoiceid = " . $this->invoiceid;
i, li, and t are aliases for the invoices table, lineitems table, and the derived table in the second query, respectively.
回答2:
You can't combine the sum function from mysql with the array type from php.
You can use the array_sum function from php on the array from php.
"UPDATE invoices
SET totalquantity = '". array_sum($itemRecord[11]) ."'
WHERE invoices.id = ".$this->invoiceid."
;"
来源：https://stackoverflow.com/questions/40116029/update-mysql-table-column-using-the-sum-of-a-php-value-stored-in-an-array