mysqli在日期爲空時不會插入

Question

在我的表中，有一個名爲receivedOn的列，它是一個日期類型。所以，如果我這樣做

$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)"); 

它將成功插入數據，但如果$ receivedOn是空的，它不會插入數據，並會像它只是掛在那裏。沒有錯誤返回。我怎麼才能讓mysqli插入數據，即使當receivedOn爲空時？我可以使用正常的MySQL查詢（非mysqli的）

Answer 1

與emtpy receivedOn插入數據嘗試這樣做：

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