Question

我想更新属于以下客户的三个发票数据：

function updateInvoice($dbh, $id, $amount, $bal, $payer){
$q = $dbh->query("SELECT * FROM `zinvoice` WHERE `id`='$id' 
                  AND `status` IN ('Balance','Not Paid')");
$nrow = count($q->fetchAll());
$remain = 0;
if($nrow==1){
    //update the amount
    if($amount>$bal){
        $remain = $amount-$bal;
        $dbh->query("UPDATE zinvoice SET paidamount=(paidamount+$bal),
                     balanceamount='0', status='Paid'
                     WHERE id='$id'");
        //payment history update
    }else if($amount==$bal){
        $remain = 0;
        $dbh->query("UPDATE zinvoice SET paidamount=(paidamount+$bal),
                     balanceamount='0', status='Paid'
                     WHERE id='$id'");
        //payment history update
    }else{
        $newbal = $bal-$amount;
        $dbh->query("UPDATE zinvoice SET paidamount=(paidamount+$amount),
                     balanceamount='$newbal', status='Balance'
                     WHERE id='$id'");
        $remain = 0;
        //payment history update
    }
}else{
    //Nothing to update Because there is no Invoice with balance or not paid
} 
return $remain;

}

现在我想通过客户ID = 2更新多个发票。 id = 2的客户有三张发票，总金额为1500，发票ID = 1金额= 500，发票ID = 2金额= 700，发票ID = 3金额= 300

 //Loop to update
  $q = $dbh->query("SELECT * FROM zinvoice WHERE customerid='$cid'");

  while($row =$q->fetch(PDO::FETCH_OBJ)):
    $remain = updateInvoice($dbh, $row->id, $amount, $row->balanceamount, $payer);
    if($remain>=1){
        updateInvoice($dbh, $row->id, $remain, $row->balanceamount, $payer);
    }else{
        //nothing
    }
endwhile;

$amount would come from a form//amount = 800
$cid would also come from a form//cid = 2
$payer would also come from a form//payer = john

问题是此代码将所有发票更新为status=Paid。我希望此代码更新余额金额为700的Invoice id=2，并且剩余100个金额，它会继续更新其他发票，例如Invoice id=3。但是Invoice id=3的余额amount=300大于100 amount，它会从100中减去Invoice id=3而200 balance amount会{{1}}。并且没有更多的金额，并将停止更新。

我如何实现所需的输出？

注意：我没有使用预准备语句来避免更多代码。这段代码很容易受到sql注入。

在php while循环中减去后保留剩余的值

0 个答案: