如何使用相关子查询进入Codeigniter中的活动记录查询

Question

我正致力于从不同的表中获取客户详细信息。我已经创建并测试了这个查询，它工作正常。问题是如何将用户（转换）为Active Query查询。谢谢。

  SELECT c.cust_id, `c`.`cust_contact_name`, `c`.`cust_active_flag`, 
      (select COUNT(`pm`.`cust_id`) from property_master as pm 
      Where pm.cust_id = c.cust_id) as prop_count, 
      (select a.addr_phoneno1 from address as a 
      WHERE a.cust_id = c.cust_id AND a.addr_type_flag IN ('C', 'CP')) as cust_phone, 
      (select count(ci.cust_id) from customer_inquiry as ci 
      WHERE ci.cust_id = c.cust_id) as inquiry_count, 
      (select max(inq_date) from customer_inquiry as ci 
      WHERE ci.cust_id = c.cust_id) as last_inq_date 
      FROM customer as c 
      GROUP BY c.cust_ID 

Answer 1

CodeIgniter活动记录类不直接支持子查询。您可以使用任何第三方库，如NTICompass CodeIgniter-Subqueries或$this->db->query();来执行您的查询。

不过，您可以使用以下方法。但我会建议使用$this->db->query();

$this->db->select('c.cust_id, `c`.`cust_contact_name`, `c`.`cust_active_flag`, 
      (select COUNT(`pm`.`cust_id`) from property_master as pm ' Where pm.cust_id = c.cust_id) as prop_count, (select a.addr_phoneno1 from address as a 
      WHERE a.cust_id = c.cust_id AND a.addr_type_flag IN ('C', 'CP')) as cust_phone, 
      (select count(ci.cust_id) from customer_inquiry as ci 
      WHERE ci.cust_id = c.cust_id) as inquiry_count, 
      (select max(inq_date) from customer_inquiry as ci 
      WHERE ci.cust_id = c.cust_id) as last_inq_date) 
     ->from('customer c'); 
$this->db->group_by('c.cust_ID'); 
$result = $this->db->get();