Php 不允许Codeigniter删除，除非它们包含一个；其中；或；例如；条款

我有下一个查询并返回这个

function delete_dispatchByIdPlataforma($idPlataforma)
{       
    $this->db->delete("delete from dispatch where id_licencia in
    (select id_licencia from licencias where id_plataforma = $idPlataforma)");      
}

所以我试了一下：

$this->db->select('id_licencia');
        $this->db->from('licencias');
        $this->db->where('id_plataforma', $idPlataforma);
        $where_clause = $this->db->get_compiled_select();

        #Create main query
        $this->db->where("`id_licencia` IN ($where_clause)", NULL, FALSE);
        $this->db->delete('dispatch');

---

但现在不会返回任何内容，也不会执行查询。

最后，我进行了一次select WIT JOIN操作，只获取数组中的id，然后使用此id数组对活动记录进行了删除，如下所示。单击绿色勾号，您可以接受自己的答案。

// First get the id to delete of my table    
function getIdDispatchToDelete($idPlataforma)
    {
        $this->db->select('ID_dispatch');
        $this->db->from('dispatch');
        $this->db->join('licencias', 'licencias.id_licencia = dispatch.id_licencia');
        $this->db->where('licencias.id_plataforma', $idPlataforma);     
        $query = $this->db->get();
        //echo $this->db->last_query();die();

        if($query){
            if($query->num_rows>0){             
                foreach ($query->result() as $fila){
                    $data[] = $fila->ID_dispatch;           
                }   
                return $data;           
            }
        }else 
            log_message('error', 'No se han encontrado Dispatch a borrar'.$this->db->_error_message().' - '.$this->db->last_query());
    }

// Seccond i did the delete whit the id got it.
     function delete_dispatchByIdPlataforma($idPlataforma)
    {       
        $idDispatch = $this->getIdDispatchToDelete($idPlataforma);
        $this->db->where_in('id_dispatch', $idDispatch);
        $this->db->delete('dispatch');
    }