error类CI_DB_mysql_result的对象无法转换为字符串

Question

我从以下代码中收到以下错误：

  

类CI_DB_mysql_result的对象无法转换为字符串

 $cari = $this->db->query("select sum( biaya )
    FROM bahanbenang
    WHERE id_benang
    IN ($benang) "); 

我该如何纠正？

Answer 1

你可以像这样

$this->db->select('sum( biaya )')
                ->from('bahanbenang')
                ->where('seen', 0)
                ->where_in('id_benang',$benang);
return $data->row();

Answer 2

您运行查询但必须检索其结果

$query = $this->db->query("select sum( biaya )
FROM bahanbenang
WHERE id_benang
IN ($benang) "); 

$cari = $query->result();  //this will return an array of objects. Each object is a row from the query

其他结果方法{{3}}。