PDO :: lastInsertID返回0

Question

在閱讀並嘗試了有關該主題的幾乎所有答案之后，lastInsertId仍然返回0。我認為我可能忽略了很明顯的內容，但似乎找不到。

這是我的代碼：

public function create($ordertype, $userid, $travel, $distance, $time, $description, $lineids, $amounts, $descriptions, $prices, $orderid = null) {
    try {

        $stmt = $this->db->prepare("INSERT INTO workorder(orderid, userid, ordertype, travel, description, distance, totaltime) 
                                    VALUES(:orderid, :userid, :ordertype, :travel, :description, :distance, :totaltime)
                                    ON DUPLICATE KEY UPDATE userid=:userid, ordertype=:ordertype, travel=:travel, description=:description,
                                    distance=:distance, totaltime=:totaltime");

        $stmt->bindparam(":orderid", $orderid);
        $stmt->bindparam(":userid", $userid);
        $stmt->bindparam(":ordertype", $ordertype);
        $stmt->bindparam(":travel", $travel);
        $stmt->bindparam(":description", $description);
        $stmt->bindparam(":distance", $distance);
        $stmt->bindparam(":totaltime", $time);
        $stmt->execute();
        $workorderid = $this->db->lastInsertId();
        echo $workorderid;
        exit();

        return $stmt;

        save_lines($workorderid, $lineids, $amounts, $descriptions, $prices);
    } catch(PDOException $e) {
        echo $e->getMessage();
    }
}

Answer 1

這很明顯……我忘了檢查記錄是否已經存在。 如果我不更改記錄（工作單）中的任何內容，則SQL查詢不執行任何操作，並且lastInsertId返回0 。

我更新的代碼（首先檢查orderid ID是否有ID）：

public function create($ordertype, $userid, $travel, $distance, $time, $description, $lineids, $amounts, $descriptions, $prices, $orderid = null) {
        try {
            $stmt = $this->db->prepare("INSERT INTO workorder(orderid, userid, ordertype, travel, description, distance, totaltime) 
                                        VALUES(:orderid, :userid, :ordertype, :travel, :description, :distance, :totaltime)
                                        ON DUPLICATE KEY UPDATE userid=:userid, ordertype=:ordertype, travel=:travel, description=:description,
                                        distance=:distance, totaltime=:totaltime");

            $stmt->bindparam(":orderid", $orderid);
            $stmt->bindparam(":userid", $userid);
            $stmt->bindparam(":ordertype", $ordertype);
            $stmt->bindparam(":travel", $travel);
            $stmt->bindparam(":description", $description);
            $stmt->bindparam(":distance", $distance);
            $stmt->bindparam(":totaltime", $time);
            $stmt->execute();
            if($orderid == null) {
                $workorderid = $this->db->lastInsertId();
            } else {
                $workorderid = $orderid;
            }
            if($amounts !== '') {
                $this->save_lines($workorderid, $lineids, $amounts, $descriptions, $prices);
            }
        } catch(PDOException $e) {
            echo $e->getMessage();
        }
    }