MySQL和PHP-插入NULL而不是空字符串

问题描述：

我有一条MySQL语句，该语句将一些变量插入数据库中.我最近添加了两个可选字段($ intLat，$ intLng).现在，如果未输入这些值，我将传递一个空字符串作为值.如何将明确的NULL值传递给MySQL(如果为空)?

I have a MySQL statement that inserts some variables into the database. I recently added 2 fields which are optional ($intLat, $intLng). Right now, if these values are not entered I pass along an empty string as a value. How do I pass an explicit NULL value to MySQL (if empty)?

$query = "INSERT INTO data (notes, id, filesUploaded, lat, lng, intLat, intLng)
          VALUES ('$notes', '$id', TRIM('$imageUploaded'), '$lat', '$long', 
                  '$intLat', '$intLng')";
mysql_query($query);

答

要将NULL传递给MySQL，您只需这样做.

To pass a NULL to MySQL, you do just that.

INSERT INTO table (field,field2) VALUES (NULL,3)

因此，在您的代码中，检查if $intLat, $intLng是empty，如果是，请使用NULL而不是'$intLat'或'$intLng'.

So, in your code, check if $intLat, $intLng are empty, if they are, use NULL instead of '$intLat' or '$intLng'.

$intLat = !empty($intLat) ? "'$intLat'" : "NULL";
$intLng = !empty($intLng) ? "'$intLng'" : "NULL";

$query = "INSERT INTO data (notes, id, filesUploaded, lat, lng, intLat, intLng)
          VALUES ('$notes', '$id', TRIM('$imageUploaded'), '$lat', '$long', 
                  $intLat, $intLng)";

MySQL和PHP-插入NULL而不是空字符串

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