php - PDO PHP bindParam() 重复使用相同的参数

Question

昨天我决定学习 PDO 并将我们的服务器 php 重写为 PDO。

在重写代码时，我突然想到的是需要对我已经使用过的相同参数重复使用bindParam。

这是一个例子:

$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $dbh->beginTransaction();
    $stmt = $dbh->prepare("INSERT INTO Products(productID,numOfLikes) VALUES (:productID,0) ON DUPLICATE KEY UPDATE productID = productID;");
    $stmt->bindParam(":productID",$productID);
    $stmt->execute();

    if($customerID !== 0){  
        //*****Check, if customerID is in the Database, else add the customerID to the Database.
        $stmt = $dbh->prepare("INSERT INTO Customers(customerID) VALUES (:customerID) ON DUPLICATE KEY UPDATE customerID = customerID;");
        $stmt->bindParam(":customerID",$customerID);
        $stmt->execute();

        //*****if customerID and productID are NOT registered together ,then register and add +1 to productID numOfLikes
        $stmt = $dbh->prepare("SELECT customerID, productID FROM CustomerProducts WHERE productID = :productID AND customerID = :customerID");          
        $stmt->bindParam(":productID",$productID);
        $stmt->bindParam(":customerID",$customerID);
        $stmt->execute();

        if ($stmt->rowCount() == 0) {
            //echo "added";
            $stmt = $dbh->prepare("INSERT INTO CustomerProducts(customerID, productID) Values (:customerID,:productID)");
            $stmt->bindParam(":customerID",$customerID);
            $stmt->bindParam(":productID",$productID);
            $stmt->execute();

            $stmt = $dbh->prepare("UPDATE Products SET numOfLikes = numOfLikes + 1 WHERE productID = :productID");
            $stmt->bindParam(":productID",$productID);
            $stmt->execute();  
        }else {
            //echo "removed";
            $stmt = $dbh->prepare("DELETE FROM CustomerProducts WHERE productID = ".$productID." AND customerID = ".$customerID);
            $stmt->bindParam(":customerID",$customerID);
            $stmt->bindParam(":productID",$productID);
            $stmt->execute();

            $stmt = $dbh->prepare("UPDATE Products SET numOfLikes = numOfLikes - 1 WHERE productID = ".$productID);
            $stmt->bindParam(":productID",$productID);
            $stmt->execute();  
        }
    }
    $dbh->commit();

有没有办法以“更漂亮的方式”编写它？你能看到其中有任何流动吗？我将不胜感激每一个帮助。

注意:此代码将在不久的将来用于生产。

Answer 1

是的，有...

您可以将 bindParam 作为数组提供给 execute 函数...

类似这样的事情:

$statement->execute([
    ':username'=> $username,
    ':password'=> $password
]);

它仅在一个语句中使用 bindParam 和 execute，在我看来它看起来更干净。