Question

我正在尝试将计算出的SQL字段中的值作为别名从我的模型中检索到Controller中。 Codeigniter在视图中返回NULL但是当我在Workbench中运行相同的查询时，我得到了预期的结果。我的代码中有什么问题：这是我的模特

public function get_balance() {
$this->db->select('SUM(IFNULL(transactions.credit,0)-IFNULL(transactions.debit,0)) AS clientBalance',FALSE);
$this->db->from('transactions');
$this->db->where('clientID', $this->uri->segment(3));
$this->db->group_by('accountID');
$query = $this->db->get();
return $query->row_array();
}

我的控制器

public function transactions($clientID = NULL) {
        $data['client_balance'] = $this->accounts_model->get_balance();

                $data['client_Balance'] = $data['client_balance']['clientBalance'];
        }

Answer 1

试试这个

public function get_balance() {
  $this->db->select('SUM(IFNULL(transactions.credit,0)-IFNULL(transactions.debit,0)) AS clientBalance', FALSE);
  $this->db->from('transactions');
  $this->db->where('clientID', $this->uri->segment(3));
  $this->db->group_by('accountID');
  $query = $this->db->get();
  $result = $query->row_array();
  echo "<pre>".$this->db->last_query();
  die;
  return $result;
}

它将打印您的查询，然后与Workbench查询匹配或者
在Workbench中执行此打印查询

然后你就可以知道哪里犯了错误。

Codeigniter活动记录和表别名

1 个答案: