Question

我正在为我的项目创建发票。共有3页。我是数据库和php的新手（只有1个月的时间通过这2个主题崩溃）所以请原谅我，如果我的代码/或数据库逻辑不足。

对于所有3个页面，它们已经连接到数据库，我取出了文件名，以免混乱代码块。

第一页是发票的表格。用户键入他/她的名字，然后键入描述，金额，数量和折扣变量。单击“提交”将转到第2页。

如果在page1中输入了多行输入，则第二页更多是循环变量的后端处理。然后它将所有这些输入解析为一个名为invoicesub的表。它还将客户名称编码到底部重定向链接的URL中。

第3页是我想要显示所有这些变量的地方，例如客户名称，描述，数量，金额，总额，表格中的折扣，还要在表格invoicesub中输入总变量的总和。我还想将打印变量的所有变量重新插入到名为invoicefinal的同一数据库中的另一个表中。

第一页（表格）

<script type="text/javascript">

var count = 0;


function addTextArea(){
count= count+1;
var div = document.getElementById('name');
div.innerHTML += "<div> <input type='text' name='name[]' value='' "+"id=name"+count+"> </div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('quantity');
div.innerHTML += "<div><input type='text' name='quantity[]' value ='' "+"id=quantity"+count+"></div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('amount');
div.innerHTML += "<div><input type='text' name='amount[]'  value ='' "+"id=amount"+count+"></div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('discount');
div.innerHTML += "<div><input type='text' name='discount[]'  value ='' "+"id=discount"+count+"></div>";
div.innerHTML += "\n<br />";
}

function removeTextArea(){
document.getElementById("name"+count).remove();

document.getElementById("quantity"+count).remove();

document.getElementById("amount"+count).remove();

document.getElementById("discount"+count).remove();
count = count-1;
}

</script>


</head>

<body>

<form  action="invoicesubmit.php" method="POST">
<?php
echo "<table border='2'>\n"; 
echo "<tr>\n"; 
echo "<th>Description</th>\n"; 
echo "<th>Quantity</th>\n"; 
echo "<th>Amount($)</th>\n";
echo "<th>Discount(%)</th>\n";
echo "</tr>"; 

echo "<tr>";
echo "<td>"?><input type='text' size="50" name='name[]' value='Examination and Consultation' readonly/><?php "</td>";
echo "<td>"?><input type='text' size="50" name='quantity[]' value='' /><?php "</td>";
echo "<td>"?><input type='text' size="50" name='amount[]' value='' /><?php "</td>";
echo "<td>"?><input type='text' size="50" name='discount[]' value='' /><?php "</td>";
echo "</tr>";

echo "<tr>"; 
echo "<td>"?><div id="name"></div> <?php "</td>"; 
echo "<td>"?><div id="quantity"></div> <?php "</td>"; 
echo "<td>"?><div id="amount"></div> <?php "</td>"; 
echo "<td>"?><div id="discount"></div> <?php "</td>"; 
echo "</tr>";
?>
Customer Name:
<br />
<input type="text" name="cust_name" value="" /> &nbsp;
<br />
<input type="button" value="Add Description" onClick="addTextArea();"> &nbsp;


<input type="button" value="Remove Description" onClick="removeTextArea();"> &nbsp;
<input type="submit" name="submit" value="submit">

</form>

</body>
</html>

第二页（将变量插入表invoicesub）

if (isset($_POST['submit'])){ // Process the form
    $name_array = $_POST['name'];
    $quantity_array = $_POST['quantity'];
    $amount_array = $_POST['amount'];
    $discount_array = $_POST['discount'];
    $cust_name_array = mysql_prep( $_POST['cust_name']);
    for ($i = 0; $i < count($name_array); $i++){
        $cust_name = $cust_name_array;
        $name = $name_array[$i];
        $quantity = $quantity_array[$i];
        $amount = $amount_array[$i];
        $discount = $discount_array[$i];
        $total_amt = ($amount - ($amount * ($discount / 100))) * $quantity;


            global $connection;
            $query = "INSERT INTO invoicesub (";
            $query.= " cust_name, description, quantity, amount, discount, total";
            $query.= ") VALUES (";
            $query.= " '{$cust_name}', '{$name}', {$quantity}, {$amount}, {$discount}, {$total_amt}";
            $query.= ")";

            $result = mysqli_query($connection, $query);


        }


           redirect_to("invoicesubmitfinal.php?cname=".urlencode($cust_name));

        }

第3页（试图总变量）

<?php

echo "<table border='1'>\n";
echo "<tr>\n";
echo "<th>Description</th>\n";
echo "<th>Quantity</th>\n";
echo "<th>Amount($)</th>\n";
echo "<th>Discount(%)</th>\n";
echo "<th>Total_amt</th>\n";
echo "</tr>";


global $connection;

$sql1="SELECT sum(amount) as amount, sum(quantity) as quantity, sum(total) as total FROM invoicesub where cust_name=$name";
$result2 = mysqli_query($connection, $sql1) or die(mysqli_error());

while ($rows = mysql_fetch_array($result2)){
            echo "<tr>";
            echo "<td>" . $rows['quantity'] . "</td>";
            echo "<td>" . $rows['amount'] . "</td>";
            echo "<td>" . $rows['discount']. "%" . "</td>";
            echo "<td>" ."$". $rows['total']  . "</td>";
            echo "<td>" . "$" . $total_amt . "</td>";
            echo "</tr>";
    echo $rows['amount'];
    echo $rows['quantity'];
    echo $rows['total'];

}
?>

Answer 1

您需要使用返回每一行的查询。您可以在打印详细记录时计算总计：

$det_sql = "SELECT description, quantity, amount, discount, total
            FROM invoicesub
            WHERE cust_name = ?";
$det_stmt = mysqli_prepare($connection, $det_sql);
mysqli_stmt_bind_param($det_stmt, "s", $name);
mysqli_stmt_execute($det_stmt);
mysqli_stmt_bind_result($det_stmt, $description, $quantity, $amount, $discount, $total);
$total_quantity = $total_amount = $total_total = 0;
while (mysqli_stmt_fetch($det_stmt)) {
    echo "<tr><td>$description</td><td>$quantity</td><td>\$$amount</td><td>$discount%</td><td>\$$total</td></tr>";
    $total_quantity += $quantity;
    $total_amount += $amount;
    $total_total += $total;
}
echo "<tr><td>Totals:</td><td>$total_quantity</td><td>\$$total_amount</td><td></td><td>\$$total_total</td></tr>";

计算总变量之和的问题

1 个答案: