php Query join tables

Question

In my Joomla component I have two table:

Table1: #__com_units

 Id | unit | posx | posy 
 ------------------------
  1 | 001A | 100 | 200
  2 | 002A | 101 | 202
  3 | 003A | 102 | 204
  4 | 004A | 103 | 206
  5 | 005A | 104 | 208

Table1: #__com_reservations

 Id | unit |     From    |     To    | Mood (dropdown with value of Avaliable and Rented)
 --------------------------------------------
  1 | 001A | YYYY-MM-DD | YYYY-MM-DD |Available
  2 | 002A | YYYY-MM-DD | YYYY-MM-DD |Rented
  3 | 003A | YYYY-MM-DD | YYYY-MM-DD |Available
  3 | 004A | YYYY-MM-DD | YYYY-MM-DD |Available
  3 | 005A | YYYY-MM-DD | YYYY-MM-DD |Rented

i want two get two query to show the result as buttons, but its not working:

1) One for Rented units

  $db = JFactory::getDbo();
  $query = $db->getQuery(true);
  $jinput = JFactory::getApplication()->input;
  $query->select($db->quoteName(array('id', 'unit', 'mood', 'posx', 'posy')));
  $query->from($db->quoteName('#__com_units', '#__com_reservations'));
  $query->where($db->quoteName('unit')." = ".$db->quote('1'),'AND')     
  ->where($db->quoteName('mood')." = ".$db->quote('rented'));
  $db->setQuery($query);
  $results = $db->loadObjectList();
  foreach ($results as $result)
  {
  echo '<button class=" ' . $result->mood . ' ' . $result->posx . ' ' . $result->posy . '" value=' . $result->id . ' disabled> ' . $result->unit  . '</button>';
 }

2)One for Avaliable units

  $db = JFactory::getDbo();
  $query = $db->getQuery(true);
  $jinput = JFactory::getApplication()->input;
  $query->select($db->quoteName(array('id', 'unit', 'mood', 'posx', 'posy')));
  $query->from($db->quoteName('#__com_units', '#__com_reservations'));
  $query->where($db->quoteName('unit')." = ".$db->quote('1'),'AND')     
  ->where($db->quoteName('mood')." = ".$db->quote('available'));
  $db->setQuery($query);
  $results = $db->loadObjectList();
  foreach ($results as $result)
  {
  echo '<button class=" ' . $result->mood . ' ' . $result->posx . ' ' . $result->posy . '" value=' . $result->id . ' disabled> ' . $result->Unit  . '</button>';
 }

3)And what if i want to have one query for rented units when they have valid date range?

Answer 1

Your query should be like this if you want to get result from two tables combined

$db = JFactory::getDbo();
  $query = $db->getQuery(true);
  $jinput = JFactory::getApplication()->input;
  $query->select($db->quoteName(array('a.unit', 'b.mood', 'a.posx', 'a.posy')));

  $query->from($db->quoteName('#__com_units', 'a'));
  $query->join('INNER', $db->quoteName('#__com_reservations', 'b') . ' ON (' . $db->quoteName('a.unit') . ' = ' . $db->quoteName('b.unit') . ')');

REST OF YOUR QUERY You are doing unit = 1, I dont know how as unit is given as 001A, 002A etc. If you follow the above syntax there wont be any error.