我使用 Codeigniter 的 Query Builder 类编写了一个查询。查询使用别名和 having 方法。当我在此查询上调用 count_all_results 方法时,会发生异常。检查日志,我看到查询已去除"具有"子句。有没有办法在调用count_all_results时保留这些子句?感谢您的帮助。
编辑:我首先认为这个问题是基于知识而不是基于代码的,所以没有分享代码,但它就在这里。如果需要更多,请告诉我。
下面是对控制器中模型的调用。
$where_array = array(
$parent_key.' is not NULL' => null
);
$search_post = $request_data['search'];
if (isset($request_data['filter'])) {
$filter_array = $request_data['filter'];
foreach ($filter_array as $filter_pair) {
if (isset($filter_pair['escape'])) {
$where_array[$filter_pair['filterBy']] = null;
} else {
if ($filter_pair['filterBy'] == 'table3_id') {
$where_array['table3.'.$filter_pair['filterBy']] = isset($filter_pair['filterId']) ?
$filter_pair['filterId'] : null;
} else {
$where_array[$table.'.'.$filter_pair['filterBy']] = isset($filter_pair['filterId']) ?
$filter_pair['filterId'] : null;
}
}
}
}
$like_array = array();
foreach ($request_data['columns'] as $key => $column) {
if (!empty($column['search']['value'])) {
$like_array[$column['data']] = $column['search']['value'];
}
}
$totalFiltered = $this->$model_name->modelSearchCount($search, $where_array, $like_array);
下面是模型方法。
public function modelSearchCount($search, $where_array = null, $like_array = null)
{
$this->joinLookups(null, $search);
if ($where_array) {
$this->db->where($where_array);
}
if ($like_array) {
foreach($like_array as $key => $value) {
$this->db->having($key." LIKE '%". $value. "%'");
}
}
return $this->db->from($this->table)->count_all_results();
}
protected function joinLookups($display_config = null, $search = null)
{
$select_array = null;
$join_array = array();
$search_column_array = $search ? array() : null;
$i = 'a';
$config = $display_config ? $display_config : $this->getIndexConfig();
foreach ($config as $column) {
if (array_key_exists($column['field'], $this->lookups)) {
$guest_model_name = $this->lookups[$column['field']];
$this->load->model($guest_model_name);
$join_string =$this->table.'.'.$column['field'].'='.$i.'.'.
$this->$guest_model_name->getKey();
$guest_display = $this->$guest_model_name->getDisplay();
if ($search) {
$search_column_array[] = $i.'.'.$guest_display;
}
$join_array[$this->$guest_model_name->getTable().' as '.$i] = $join_string;
$select_array[] = $i.'.'.
$guest_display;
} else {
$select_array[] = $this->table.'.'.$column['field'];
if ($search) {
$search_column_array[] = $this->table.'.'.$column['field'];
}
}
$i++;
}
$select_array[] = $this->table.'.'.$this->key;
foreach ($join_array as $key => $value) {
$this->db->join($key, $value, 'LEFT');
}
$this->db->join('table2', $this->table.'.table2_id=table2.table2_id', 'LEFT')
->join('table3', 'table2.table3_id=table3.table3_id', 'LEFT')
->join('table4', $this->table.'.table4_id=table4_id', 'LEFT')
->join('table5', 'table4.table5_id=table5.table5_id', 'LEFT');
$this->db->select(implode($select_array, ', '));
if ($search) {
foreach (explode(' ', $search) as $term) {
$this->db->group_start();
$this->db->or_like($this->table.'.'.$this->key, $term);
foreach ($search_column_array as $search_column) {
$this->db->or_like($search_column, $term);
}
$this->db->group_end();
}
}
$this->db->select('table2_date, '. $this->table.'.table2_id, table4_id, '. 'table5.table5_description');
}
由于count_all_results()
基本上会运行一个Select count(*)
并且不计算结果集中的行(基本上使查询对你的目的无用),你可以使用其他Codeigniter方法来获取结果集和行计数。
尝试将查询运行到变量中:
$query = $this->db->get();
从那时起,您几乎可以做任何事情。除了使用 $query->result();
返回结果外,您还可以通过以下方式将行数获取到另一个变量中:
$rownum = $query->num_rows();
然后,您可以将其返回到控制器中,或者甚至只返回$query
对象,然后在控制器上运行num_rows()
方法
为了回答这个问题,count_all_results() 通过将你的选择替换为 SELECT COUNT(*) FROM table
来转换原始查询。 不会选择别名列,并且 HAVING 子句将无法识别该列。这就是为什么 count_all_results() 不适用于 have。