CakePHP模型中使用join的多种写法

Cake写法

        App::import("Model","Client");
        $this->Client = & new Client();
        $this->Client->recursive = -1;
        $options['conditions'] = array('Client.id' => $client_id);
        $options['fields'] = "LeadSource.name";
        $options['joins']  = array(
            array('table' => 'lead_sources',
                'alias' => 'LeadSource',
                'type' => 'LEFT',
                'conditions' => array(
                    'Client.lead_source_id = LeadSource.id',
                )
            )
        );
        $result = $this->Client->find('first',$options);

当给定$client_id值，转换成的SQL：

SELECT `LeadSource`.`name` FROM `clients` AS `Client` LEFT JOIN lead_sources AS `LeadSource` ON (`Client`.`lead_source_id` = `LeadSource`.`id`) WHERE `Client`.`id` = '5213a989-571f-3054-91a8-6ee84568b17e' LIMIT 1

更简洁的原生SQL写法

        $lead_source_name = $this->Client->query("select lead_sources.name from lead_sources,clients
                              where clients.lead_source_id = lead_sources.id
        and clients.id = '$client_id'");