您可以这样做（此代码尚未测试）。

function schedule_sql_command($user_login, $user) { 
  // 12 hours in seconds.
  $from_now = 12 * 60 * 60;
  // schedule a call to a custom hook passing in the user\'s ID
  wp_schedule_single_event(time() + $from_now, \'run_sql_command\', array( $user->ID) );
}

// this is the custom hook that takes the user_id as a param
function run_sql_command($user_id) { 
 global $wpdb;
 $wpdb->query("Your query here using $user_id"); 
}
// Hook when user logs in
add_action( \'wp_login\', \'schedule_sql_command\') ;