左连接的cakephp select语句

Question

I have two tables are Servers and ApplicationsGroupsServers , where server_id is foreign key to Servers.id .

I am trying to write a query to select a field called server_name from servers table and left join all data from ApplicationsGroupsServers table.

$option = array(
    'join' => array(
            'table' => 'Servers',
            'alias' => 's',
            'type' => 'left',
            'conditions' => array( 's.id = ApplicationsGroupsServers.id' )
        )
);
$apps = $this->ApplicationsGroupsServers->find('all', array(
    "fields" => array('Servers.server_name'), ($option)
));
$this->set('applications', $apps);

But, when I run a query like shown below. I am able to populate results:

$apps = $this->ApplicationsGroupsServers->find('all', $option);

SQL Query in the back end that runs:

SELECT ApplicationsGroupsServers.id AS `ApplicationsGroupsServers__id`, 
    ApplicationsGroupsServers.application_id AS `ApplicationsGroupsServers__application_id`, 
    ApplicationsGroupsServers.group_id AS `ApplicationsGroupsServers__group_id`, 
    ApplicationsGroupsServers.server_id AS `ApplicationsGroupsServers__server_id` 
FROM applications_groups_servers ApplicationsGroupsServers 
     left JOIN Servers s ON s.id = ApplicationsGroupsServers.id

However, I am trying to run something like this:

SELECT server_name
  FROM applications_groups_servers
       LEFT JOIN servers
          ON servers.id = applications_groups_servers.server_id
       LEFT JOIN groups ON groups.id = applications_groups_servers.group_id

Answer 1

You should try to create relationships between your models instead of using join queries, but if you really want to use a join query:

$options = array(
    'fields' => array(
        'Server.name' // Server not Servers
    ),
    'join' => array(
        array(
            'table' => 'servers',
            'alias' => 'Server',
            'type' => 'LEFT',
            'conditions' => array(
                'Server.id = ApplicationsGroupsServers.server_id',
            )
        ),
        array(
            'table' => 'groups',
            'alias' => 'Group',
            'type' => 'LEFT',
            'conditions' => array(
                'Group.id = ApplicationsGroupsServers.group_id',
            )
        )
    )
) ;

Answer 2

Try like this

$this->Server->Behaviors->load('Containable');
$this->Server->bindModel(array('ApplicationsGroups'=>array('classname'=>'ApplicationsGroupsServer','foriegnKey'=>'server_id')));
$app=$this->Server->find(all,array('contain'=>array('ApplicationsGroupsServer.server_name')));