Zend_Db_Expr NOW() doesn't work?

Question

I am trying the simple insert:

$data = array
(
'whatever' => 'nevermind',
'etc' => 'more data',
'updated_on' => new Zend_Db_Expr('NOW()')
);

$this->getDbTable()->insert( $data );

Everything gets inserted correctly, but updated_on is null. Am I doing something wrong? I understand it may be not easy to determine the problem from what I said, but maybe you could suggest at least how could I debug this? Thanks in advance

p.s. database is mySQL and column is DATETIME, and if I connect to mySQL and manually try the insert or update NOW(), it does work.

Update

Using Profiler, I get the following output:

INSERT INTO `db_table` (`column1`, `column2`, `column3`, `column4`, `column5`, `column6`, `column_datetime`, `column7`) VALUES (?, ?, ?, ?, ?, ?, NOW(), ?)

Array
(
    [1] => column1 data
    [2] => column2 data
    [3] => column3 data
    [4] => column4 data
    [5] => column5 data
    [6] => column6 data
    [7] => column7 data
)

To my knowledge, everything is fine here :\

Update2: Nevermind, I got it working. Problem was entirely different.

Answer 1

Based solely on the code you are posting, this should work.

Since it does not, you should use the profiler to debug the query:

$db = $this->getDbTable();
$adapter = $db->getAdapter();
$adapter->getProfiler()->setEnabled(true);
$data = array
(
    'whatever' => 'nevermind',
    'etc' => 'more data',
    'updated_on' => new Zend_Db_Expr('NOW()')
);
$db->insert( $data );
print $adapter->getProfiler()->getLastQueryProfile()->getQuery();
print_r($adapter->getProfiler()->getLastQueryProfile()->getQueryParams());
$adapter->getProfiler()->setEnabled(false);