php - 使用 PDO 插入时获取自动递增行 ID

Question

我正在将新数据插入MySQL，并且我有一个名为“bookingid”的列，它是主键并且具有自动增量。我需要获取插入数据后自动递增的数量，这是我的代码:

    try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

   // prepare sql and bind parameters
$stmt = $conn->prepare("INSERT INTO reservations (bookingdatetime, firstname, lastname, address) 
VALUES (:bookingdatetime, :firstname, :lastname, :address)");

$stmt->bindParam(':bookingdatetime', $bookingdatetime);
$stmt->bindParam(':firstname', $fname);
$stmt->bindParam(':lastname', $lname);
$stmt->bindParam(':address', $address);


// insert a row

$stmt->execute();

echo "success! row id: ";

}catch(PDOException $e){
echo json_encode(array("title" => "Database Error", "body" => $e->getMessage()));
}
$conn = null;

如何回显显示“成功!行 ID:”的增量？谢谢!

Answer 1

您可以使用lastInsertId()检索插入的最后一行:

$stmt->execute();
echo "success! row id: $stmt->lastInsertId()";

注意事务中lastInsertId()必须在commit()之前调用，否则会返回0.