php - Codeigniter Active Record - 计算找到的总行数(MySQL)

我在应用了限制的 Codeigniter 模型中使用复杂的 SQL 查询。如果未应用限制和偏移量，我想计算将找到的总行数。

我想将计数以及结果数组返回给我的 Controller - 我该怎么做？如果这是正确的解决方案，我将 SQL_CALC_FOUND_ROWS 放在哪里？

这是查询(最初不是我自己构建的):

$this->db
  ->select('table1.*
      ,table2.*
      ,table3.*
      ,table4.*
      ,table5.*
      ,table6.*
      ,table7.*
      ,table8.*
      ,table9.*
      ,(SELECT GROUP_CONCAT(field1) FROM table10 WHERE table10.field3 = table9.field2) as categories
      ,(SELECT GROUP_CONCAT(field1) FROM table5 WHERE table5.field11 = table4.field12 AND table4.field21 = 0 AND table5.field1 != 0) as categories2
      ,(SELECT AVG(table11.field4) FROM table11 WHERE table11.field6 = table9.field2) as rating
      ,(SELECT COUNT(table12.field5) FROM table12 WHERE table12.field7 = table9.field2) as rated_times')
  ->from('table9')
  ->join('table10', 'table10.field3 = table9.field2')
  ->join('categories', 'categories.field1 = table10.field1')
  ->join('table3', 'table3.field8 = table9.field2')
  ->join('table1', 'table1.id = table9.field2')
  ->join('table2', 'table2.field9 = table9.field2 AND table2.field19 = 1', 'left')
  ->join('table4', 'table4.field10 = table9.field2 AND table4.field21 = 0', 'left')
  ->join('table5', 'table5.field11 = table4.field12 AND table5.field1 != 0', 'left')
  ->join('table6', 'table6.field13 = table9.field2 AND table6.field22 BETWEEN SYSDATE() - INTERVAL 90 DAY AND SYSDATE()', 'left')
  ->join('table7', 'table7.field14 = table9.field2', 'left')
  ->join('table8', 'table8.field15 = table9.field2', 'left')
  ->where('table1.field16', NULL)
  ->where($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();

真的很感激任何帮助!

最佳答案

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

首先，将选项 SQL_CALC_FOUND_ROWS 设置为 select 语句中的伪列，并将转义查询设置为 false:

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

然后，在使用限制和偏移量执行查询后，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来一步完成所有工作。

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

并返回结果和行数数组。

return $return;