我如何将主键的值插入到插入查询中

Question

我如何在customer_information表中检索主键的值，以便可以将该值输入INSERT语句以将数据存储到我的customer_payment_information表中？

我想到了调用主键的值并将其存储在变量中，这样我就可以将变量输入到INSERT语句中，以存储我的customer_payment_information表的数据。

很遗憾，我的数据库中没有任何存储。

这是我的代码：

$sql = "SELECT customer_id FROM customer_information ORDER BY customer_id DESC LIMIT 1";
if ($conn->query($sql)){
    $compile = $conn->prepare("INSERT INTO customer_payment_information (customer_id, fullName, creditcardNumber, expiry, ccv) VALUES (?, ?, ?, ?, ?)");            
    $compile->bind_param("issss", $sql, $ccname, $ccnumber, $expdate, $ccvnumber);
    $compile->execute();
    $compile->close();
    $conn->close();
} else {
    $errorMsg = "Connection failed: " . $conn->connect_error;
}

表1的主键具有auto_increment，因此是SQL查询

“从customer_information中选择customer_id来自customer_id DESC LIMIT 1”

表1：TABLE 1 FORMAT

表2：TABLE 2 FORMAT

Answer 1

您需要执行您的inital select语句并获得结果。这样的事情应该为您做。

$sql = "SELECT customer_id FROM customer_information ORDER BY customer_id DESC LIMIT 1";
$customerQuery = $conn->query($sql);
$customerResult = $customerQuery->fetch_assoc();
$customerId = $customerResult['customer_id'];

$compile
    = $conn->prepare("INSERT INTO customer_payment_information (customer_id, fullName, creditcardNumber, expiry, ccv) VALUES (?, ?, ?, ?, ?)");
$compile->bind_param("issss", $customerId, $ccname, $ccnumber, $expdate, $ccvnumber);
$compile->execute();
$compile->close();
$conn->close();

您可能会在插入记录后考虑使用SELECT LAST_INSERT_ID()之类的东西来获取其ID以备将来使用。