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db_update after a submit button is clicked

I want to update a field. This the code I am using to write values in the database.

$enrollment = array(   'database' => 'enrollment',   'username' => 'postgres',    'password' => '',    'host' => 'localhost',    'driver' => 'pgsql', );    Database::addConnectionInfo('myid', 'default', $enrollment);  db_set_active('enrollment');  db_update('student')   ->fields(array('picture' => 'Yucks'))   ->condition('studid', '101-03043', '=')   ->execute();  db_set_active();

The code doesn’t work. Instead of saving values in the database, it throws an error.

screenshot

What do I need to change in the code to make it work?

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db_update after a submit button is clicked

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