问题：在文件invoiceconfirm.php中，最后有一个删除表内容（invoicesub）的代码，但它不起作用。完成所有计算后，invoicesub表的所有内容都将传输到displaybilling表。我希望删除invoicesub表，因为在invoicesubitfinal页面中有计算，如果输入相同的客户名称，则会导致计算错误。因此，我需要删除invoicesub表的内容。
文件说明：Invoice submit.php接受名称，数量，金额，折扣和客户名称变量，然后将其插入表invoicesub。之后，它会重定向到invoicesubmitfinal。
invoicesubmitfinal.php将刚刚打印出无论是在invoicesub的表，然后添加在一个隐藏字段，其将解析的名称，总金额和支付变量到invoiceconfirm.php
Invoiceconfirm.php的目的是将invoicesub中的所有内容插入名为displayoutstanding的新表中。但是，我还想删除invoicesub中的所有内容，因为如果在表单中输入相同的客户名称，则会导致总和中的计算错误。
Invoicesubmit.php
<?php
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;
echo "<tr>";
echo "<td>" . $name . "</td>";
echo "<td>" . $quantity . "</td>";
echo "<td>" . "$" . $amount . "</td>";
echo "<td>" . $discount . "%" . "</td>";
echo "<td>" . "$" . $total_amt . "</td>";
echo "</tr>";
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));
}
?>
invoicesubmitfinal.php
<?php
echo "<table border='1'>\n";
echo "<tr>\n";
echo "<th>Services Rendered</th>\n";
echo "<th>Quantity</th>\n";
echo "<th>Price($)</th>\n";
echo "<th>Discount(%)</th>\n";
echo "<th>Amount($)</th>\n";
echo "</tr>";
$cname = $_GET["cname"];
global $connection;
$sql1="SELECT description,quantity, amount, discount, total FROM invoicesub WHERE cust_name='$cname' GROUP BY description ORDER BY id";
$result2 = mysqli_query($connection, $sql1) or die(mysqli_error($connection));
while ($rows = mysqli_fetch_array($result2)){
echo "<tr>";
echo "<td>" . $rows['description'] . "</td>";
echo "<td>" . $rows['quantity'] . "</td>";
echo "<td>" . $rows['amount'] . "</td>";
echo "<td>" . $rows['discount']. "%" . "</td>";
echo "<td>" ."$". $rows['total'] . "</td>";
echo "</tr>";
}
echo "</table>";
?>
<?php
$sql1="SELECT SUM(total) as total_amt_2 FROM invoicesub WHERE cust_name='$cname'";
$result3 = mysqli_query($connection, $sql1) or die(mysqli_error($connection));
while ($row = mysqli_fetch_array($result3)){
echo "<tr>";
echo "<td>". "Total Amount: " ."$ ". $row['total_amt_2'] . "</td>";
echo "</tr>";
$cname = $_GET["cname"];
$sumtotal = $row['total_amt_2'];
echo "<form action=\"invoiceconfirm.php\" method=\"POST\">";
echo "<input type=\"hidden\" name=\"total_amt\" value=\"$sumtotal\" />";
echo "<input type=\"hidden\" name=\"customer_name\" value=\"$cname\" />";
echo "Customer Paid: "."$ ";
echo "<input type=\"text\" name=\"paid\" value=\"\"/>";
echo "<br />";
echo "<input type=\"submit\" name=\"submit\" value=\"Submit\"/>";
echo "<input type=\"button\" value=\"Cancel\" onclick=\"window.location='manage_content.php';\"/>";
echo "</form>";
}
?>
invoiceconfirm.php
<?
if (isset($_POST['submit'])){
$totalsum = $_POST["total_amt"];
$custname = $_POST["customer_name"];
$paid = $_POST["paid"];
$today=date('d-m-Y');
$outstanding = $totalsum - $paid;
global $connection;
$query = "INSERT INTO displayoutstanding (";
$query.= " cust_name, date, paid, final_total, outstanding";
$query.= ") VALUES (";
$query.= " '{$custname}', '{$today}', {$paid}, {$totalsum}, {$outstanding}";
$query.= ")";
$finished = mysqli_query($connection, $query);
echo "<table border='1'>\n";
echo "<tr>\n";
echo "<th>Services Rendered</th>\n";
echo "<th>Quantity</th>\n";
echo "<th>Price($)</th>\n";
echo "<th>Discount(%)</th>\n";
echo "<th>Amount($)</th>\n";
echo "</tr>";
global $connection;
$sql1="SELECT cust_name, description, quantity, amount, discount, total FROM invoicesub WHERE cust_name='$custname' GROUP BY description ORDER BY id";
$result2 = mysqli_query($connection, $sql1) or die(mysqli_error($connection));
while ($rows = mysqli_fetch_array($result2)){
echo "<tr>";
echo "<td>" . $rows['description'] . "</td>";
echo "<td>" . $rows['quantity'] . "</td>";
echo "<td>" . $rows['amount'] . "</td>";
echo "<td>" . $rows['discount'] . "</td>";
echo "<td>" .$rows['total'] . "</td>";
echo "</tr>";
$custname = $rows['cust_name'];
$name = $rows['description'];
$today=date('d-m-Y');
$quantity = $rows['quantity'];
$amount = $rows['amount'];
$discount = $rows['discount'];
$total = $rows['total'];
global $connection;
$query = "INSERT INTO displaybilling (";
$query.= " cust_name, date, description, quantity, price, discount, total_amt";
$query.= ") VALUES (";
$query.= " '{$custname}', '{$today}', '{$name}', {$quantity}, {$amount}, {$discount}, {$total}";
$query.= ")";
$result = mysqli_query($connection, $query);
$query = "DELETE FROM invoicesub WHERE cust_name = {$custname}";
$delete = mysqli_query($connection, $query);
}
?>
答案 0 :(得分：0)
运行查询时出现未知列错误，因为您错过了此查询中的单引号：
$query = "DELETE FROM invoicesub WHERE cust_name = {$custname}";
应该是：
$query = "DELETE FROM invoicesub WHERE cust_name = '{$custname}'";
{}括号在这里也没用，所以它可能是：
$query = "DELETE FROM invoicesub WHERE cust_name = '$custname'";
您说要删除该表。 invoicesub表中的其他数据是否比该客户的更多？如果没有，你可以考虑做
$query = "TRUNCATE invoicesub";
将清空表并将所有计数器重置为默认值。