Codeigniter活动记录 - 计算限制发现的总行数(MySQL)

Question

我在Codeigniter模型中使用复杂的SQL查询并应用了限制.如果没有应用限制和偏移量,我想计算已经找到的总行数.

我想将计数和结果数组一起返回给我的控制器 - 我该怎么做？如果这是正确的解决方案,我在哪里放SQL_CALC_FOUND_ROWS？

这是查询(我最初没有自己构建):

$this->db
  ->select('table1.*
      ,table2.*
      ,table3.*
      ,table4.*
      ,table5.*
      ,table6.*
      ,table7.*
      ,table8.*
      ,table9.*
      ,(SELECT GROUP_CONCAT(field1) FROM table10 WHERE table10.field3 = table9.field2) as categories
      ,(SELECT GROUP_CONCAT(field1) FROM table5 WHERE table5.field11 = table4.field12 AND table4.field21 = 0 AND table5.field1 != 0) as categories2
      ,(SELECT AVG(table11.field4) FROM table11 WHERE table11.field6 = table9.field2) as rating
      ,(SELECT COUNT(table12.field5) FROM table12 WHERE table12.field7 = table9.field2) as rated_times')
  ->from('table9')  
  ->join('table10', 'table10.field3 = table9.field2')
  ->join('categories', 'categories.field1 = table10.field1')
  ->join('table3', 'table3.field8 = table9.field2')
  ->join('table1', 'table1.id = table9.field2')
  ->join('table2', 'table2.field9 = table9.field2 AND table2.field19 = 1', 'left')
  ->join('table4', 'table4.field10 = table9.field2 AND table4.field21 = 0', 'left')
  ->join('table5', 'table5.field11 = table4.field12 AND table5.field1 != 0', 'left')
  ->join('table6', 'table6.field13 = table9.field2 AND table6.field22 BETWEEN SYSDATE() - INTERVAL 90 DAY AND SYSDATE()', 'left')
  ->join('table7', 'table7.field14 = table9.field2', 'left')
  ->join('table8', 'table8.field15 = table9.field2', 'left')
  ->where('table1.field16', NULL)
  ->where($where_clause_1, null, FALSE)
  ->where('table9.field17', $searchArray['search_country'])
  ->or_where($or_where_clause_2, null, FALSE)
  ->or_where($or_where_clause_3, null, FALSE)
  ->or_where($or_where_clause_4, null, FALSE)
  ->or_where($or_where_clause_5, null, FALSE)
  ->or_where($or_where_clause_6, null, FALSE)
  ->or_where($or_where_clause_7, null, FALSE)
  ->like('table9.field17', $searchArray['search_country'])
  ->order_by('table3.field18', 'ASC')
  ->order_by('table2.field19', 'DESC')
  ->order_by('table1.field20', 'DESC')
  ->group_by('table9.field2')
  ->limit($limit, $offset);    


  $data = $this->db->get();

return $data->result_array();

非常感谢任何帮助!

Answer 1

我以前对分页有完全相同的要求,我能够使用CodeIgniter Active Record使其工作.

首先,SQL_CALC_FOUND_ROWS在select语句中将选项设置为伪列,并将escape query设置为false:

$this->db->select('SQL_CALC_FOUND_ROWS null as rows, other columns ...',FALSE);

然后,在使用limit和offset执行查询后,将结果集分配给返回数组:

$data = $this->db->get();
$return['results'] = $data->result();
// Do something with the results

最后,运行第二个查询以获取找到的行,并将其分配给返回数组.我在这里使用方法链接一步完成所有操作.

$return['rows'] = $this->db->query('SELECT FOUND_ROWS() count;')->row()->count;

并返回结果和行计数数组.

return $return;