插入單個記錄，獲取最后插入的ID，然后進行多次插入

Question

我有一個表單，提交時想插入一個記錄，然后獲取最后插入的ID，然后將多行插入另一個表。

我可以正確地理解第一部分，而第二部分則不能。

public function save($data)
{
    $this->customer_id = $data['customer_id'];
    $this->description = $data['description'];
    $this->line_description = $data['line_description'];
    $this->line_amount = $data['line_amount'];


    $this->validate();

    if (empty($this->errors)) {

        $db = static::getDB();
        $stmt = $db->prepare("INSERT INTO `invoices` (`customer_id`) VALUES (:customer_id)");
        $stmt->bindValue(":customer_id", $this->customer_id, PDO::PARAM_INT);
        $stmt->execute();

        $last_id = $db->lastInsertId();


        $db = static::getDB();
        $stmt = $db->prepare("INSERT INTO `lines` (`description`, `amount`, `invoice_id`) VALUES (:description, :amount, :invoice_id)");
        $stmt->bindValue(":description", $this->line_description, PDO::PARAM_STR);
        $stmt->bindValue(":amount", $this->line_amount, PDO::PARAM_STR);
        $stmt->bindValue(":invoice_id", $last_id, PDO::PARAM_INT);
        // foreach loop here ?
        $stmt->execute();
        // end foreach
    }
}

如果var_dumped，則公共函數save（$ data）中的$ data看起來像這樣

 array(5) {
      ["customer_id"]=> string(2) "16"
      ["description"]=> string(4) "test"
      ["amount"]=> string(0) ""
      ["line_description"]=> array(2) {
           [0]=> string(5) "desc1"
           [1]=> string(4) "desc"
      }
      ["line_amount"]=> array(2) {
           [0]=> string(3) "123"
           [1]=> string(3) "456"
      }
 }

HTML輸入：

<input type="text" class="form-control" placeholder="Line Description" name="line_description[]">
<input type="text" class="form-control" placeholder="Description" name="description">

Answer 1

如果我正確理解了您的問題，則可以嘗試使用下一種方法。 行信息包含在$this->line_description和$this->line_amount ，因此您需要確保兩個數組的元素計數相等。 您的方法是正確的-准備語句並針對每一行執行此語句。

public function save($data)
{
    $this->customer_id = $data['customer_id'];
    $this->description = $data['description'];
    $this->line_description = $data['line_description'];
    $this->line_amount = $data['line_amount'];


    $this->validate();

    if (empty($this->errors)) {

        $db = static::getDB();
        $stmt = $db->prepare("INSERT INTO `invoices` (`customer_id`) VALUES (:customer_id)");
        $stmt->bindValue(":customer_id", $this->customer_id, PDO::PARAM_INT);
        $stmt->execute();

        $last_id = $db->lastInsertId();


        $db = static::getDB();
        $stmt = $db->prepare("INSERT INTO `lines` (`description`, `amount`, `invoice_id`) VALUES (:description, :amount, :invoice_id)");
        for ($i = 0; $i < count($this->line_description); $i++) 
        {       
            $stmt->bindValue(":description", $this->line_description[$i], PDO::PARAM_STR);
            $stmt->bindValue(":amount", $this->line_amount[$i], PDO::PARAM_STR);
            $stmt->bindValue(":invoice_id", $last_id, PDO::PARAM_INT);
            $stmt->execute();
        }   
    }
}