php - 当日期为空时，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

$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，但如果 $receivedOn 为空，它不会插入数据，看起来就像挂在那里一样。没有返回错误。即使receivedOn为空，如何让mysqli插入数据？我可以使用普通 mysql 查询（非 mysqli）插入带有 emtpy receivedOn 的数据

Answer 1

尝试做：

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