How do you send NULL as a variable from PHP to SQL?
I want to send a value of "NULL" to a column in mySQL.
$ParentEv开发者_运维问答entID = "NULL";
mysql_query("UPDATE events SET
ParentEventID = '$ParentEventID'");
The column keeps defaulting to "0". I have the column set to accept NULL and I can edit the cell with the NULL check box.
I need to not set the default to NULL because it may effect code in other places.
You are on the right track making "NULL"
a string. If you need to set it NULL
, then remove the qoutes around $ParentEventID
.
mysql_query("UPDATE events SET ParentEventID = $ParentEventID");
However, before doing so make sure that the value of $ParentEventID === NULL
.
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