第二个查询只导致它的数据出现在 while 循环中

Question

我正在尝试添加第二个查询以从数据库中获取数据 table 我调用了 orderdetail。当我这样做时，我从两个数据库 table 得到结果，但我只得到订单中的第一个条目 table 以显示所有内容。

我从 orderdetail table 中提取的唯一一条数据是：

<td class="tdproduct"><?php echo $row2['ProductName']; ?> </td>

其他都是订单table，它只是重复相同的信息。任何人都知道为什么？

<?php
//Selecting the data from the table but with limit
$query = "SELECT * FROM orders LIMIT $start_from, $per_page";
$query2 = "SELECT * FROM orderdetail LIMIT $start_from, $per_page";
$result = mysqli_query($con, $query);
$result2 = mysqli_query($con, $query2);
?>
    <table class="tableproduct">
    <tr>
        <th class="thproduct">Order ID</th>
        <th class="thproduct">Customer Name</th>
        <th class="thproduct">Customer Email</th>
        <th class="thproduct">Date</th>
        <th class="thproduct">Product</th>
        <th class="thproduct">Total Price</th>
        <th class="thproduct"></th>
        <th class="thproduct"></th>
    </tr>
<?php
if(isset($_POST['order_id']) && is_numeric($_POST['order_id'])) {
    mysqli_query($con, "DELETE FROM orders WHERE order_id = ". $_POST['order_id'] ."")
    or die("Could not DELETE: " . mysqli_error($con));
    "The order was successfully deleted.";
} else {
    Session::flash('order', 'The order was successfully deleted.');
}
if( $result ){
    while($row = mysqli_fetch_assoc($result)) :

        if( $result2 ){
            while($row2 = mysqli_fetch_assoc($result2)) :
                ?>
    <form method="POST" action="orderhistory.php">
        <tr>
            <td class="tdproduct"><?php echo $row['order_id']; ?> </td>
            <td class="tdproduct"><?php echo $row['customer_name']; ?> </td>
            <td class="tdproduct"><?php echo $row['email']; ?> </td>
            <td class="tdproduct"><?php echo $row['date_ordered']; ?> </td>
            <td class="tdproduct"><?php echo $row2['ProductName']; ?> </td>
            <td class="tdproduct"><?php echo $row['total_price']; ?> </td>
            <td class="tdproduct"><a href='editorderhistory.php?id=<?php echo $row['id']; ?>'>EDIT</a></td>
            <input type="hidden" name="product_id" value="<? echo $row['id']; ?>"/>
            <td class="tdproduct"><input name="delete" type="submit" value="DELETE "/></td>
        </tr>
    </form>
<?php
            endwhile;
        }
    endwhile;
}
?>

Answer 1

<?php
//Selecting the data from the table but with limit
$query = "SELECT * FROM orders LIMIT $start_from, $per_page";
$query2 = "SELECT * FROM orderdetail LIMIT $start_from, $per_page";
$result = mysqli_query($con, $query);
$result2 = mysqli_query($con, $query2);
$data = array();
$data2 = array();
?>
    <table class="tableproduct">
    <tr>
        <th class="thproduct">Order ID</th>
        <th class="thproduct">Customer Name</th>
        <th class="thproduct">Customer Email</th>
        <th class="thproduct">Date</th>
        <th class="thproduct">Product</th>
        <th class="thproduct">Total Price</th>
        <th class="thproduct"></th>
        <th class="thproduct"></th>
    </tr>
<?php
if(isset($_POST['order_id']) && is_numeric($_POST['order_id'])) {
    mysqli_query($con, "DELETE FROM orders WHERE order_id =  {$_POST['order_id']}")
    or die("Could not DELETE: " . mysqli_error($con));
    echo "The order was successfully deleted.";
} else {
    Session::flash('order', 'The order was successfully deleted.');
}
if( $result ) :
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = $row;
    }

    if ($result2) {
        while ($row2 = mysqli_fetch_assoc($result2)) {
            $data2[] = $row2;
        }
    }

    $i = 0;
    foreach ($data as $key => $values) :

    ?>

        <form method="POST" action="orderhistory.php">
            <table>
                <tr>
                    <td class="tdproduct"><?php echo $values['order_id']; ?> </td>
                    <td class="tdproduct"><?php echo $values['customer_name']; ?> </td>
                    <td class="tdproduct"><?php echo $values['email']; ?> </td>
                    <td class="tdproduct"><?php echo $values['date_ordered']; ?> </td>
                    <td class="tdproduct"><?php echo $data2[$i]['ProductName']; ?> </td>
                    <td class="tdproduct"><?php echo $values['total_price']; ?> </td>
                    <td class="tdproduct"><a href='editorderhistory.php?id=<?php echo $values['id']; ?>'>EDIT</a></td>
                    <input type="hidden" name="product_id" value="<? echo $values['id']; ?>"/>
                    <td class="tdproduct"><input name="delete" type="submit" value="DELETE "/></td>
                </tr>
            </table>
        </form>

    <?php
    $i++;
    endforeach;
endif;
?>

修改了你的一些代码，但由于我无法测试它，我不确定它是否有效，但你可以尝试一下。

如您所见，这是一种不同的查询方式，因为我在循环遍历数据之前将数据存储在数组中，所以我通常这样做，以便稍后查看代码时更容易理解发生了什么.

第二个查询只导致它的数据出现在 while 循环中

Second query causing only data from it to appear in a while loop

html

php

while-loop