当date为null时，mysqli不会插入

Question

在我的表中，有一个名为receivedOn的列，它是一个日期类型。所以，如果我这样做了

$receivedOn= "2013-11-11";
$stmt = $dbi->prepare("insert into mytable(somedata,receivedOn) values (?,?)");
$stmt->bind_param('ss',$somedata,$receivedOn); 
$result = $stmt->execute() or die (mysqli_error($dbi)");

它会成功插入数据，但是如果$ receivedOn为空，它将不会插入数据，看起来就像挂在那里一样。没有返回任何错误。即使receiveOn为空，我怎样才能使mysqli插入数据？我可以使用普通的mysql查询（非mysqli）

使用emtpy receiveOn插入数据

Answer 1

尝试做：

$receivedOn = ($receivedOn != '') ? $receivedOn : NULL;
$stmt = $dbi->prepare("insert into mytable(somedata,receivedOn) values (?,?)");
$stmt->bind_param('ss',$somedata,$receivedOn); 
...