自然排序 Ajax Codeigniter 中的数据表

Question

Struggling to figure out how to set natural sorting in AJAX Datatables using Codeigniter Active record. The field that should be sorted has, in most cases, just digits...in other cases a string, so the MySQL table field is set as VARCHAR.

I need to srt naturally the field to be displayed in Datatables.

The Active record Codeigniter query is the following.

function list_all($limit,$start,$col,$dir)
{   
    $this->rmi_db->select (" 
        $this->table_dev.id,
        $this->table_dev.fl,
        $this->table_dev.mm,
        $this->table_dev.batch,
        $this->table_dev.n,
        $this->table_dev.ditta,
        $this->table_dev.tipo,
        $this->table_dev.costruzione,
        $this->table_dev.motori,
        $this->table_dev.nc,
        $this->table_dev.serie,
        $this->table_dev.ca,
        $this->table_dev.consegna,
        $this->table_dev.matr_usaf AS usaf,
        $this->table_dev.matr_usn AS usn,
        $this->table_dev.matr_caf AS caf,
        $this->table_dev.matr_raf AS raf,
        $this->table_dev.codici,
        $this->table_dev.note,
        $this->table_dev.reg_civili,
        $this->table_dev.matricola_civ,
        $this->table_dev.prima_reg,
        $this->table_dev.n_contratto,
        $this->table_dev.data_contratto,
        $this->table_dev.importo_contratto,
        $this->table_dev.note_contratto,
        $this->table_dev.f29,
        $this->table_dev.f30,     
        ");
    $this->rmi_db->from("$this->table_dev");
    $this->rmi_db->where("$this->table_dev.mm !=", "");
    $this->rmi_db->limit($limit, $start);
    $this->rmi_db->order_by($col, $dir);
    $query = $this->rmi_db->get();

    if($query->num_rows()>0)
    {
        return $query->result(); 
    }
    else
    {
        return null;
    }
}

The mm field should be sorted naturally. I have no idea how and if it's possible to fix the issue. I tried the solution in this discussion solutions , the Bin way, but the select doesn't work properly ( got 500 server error)

Thanks a lot for any help

Answer 1

Using Solution , Try below. It should work but not tested.

function list_all($limit,$start,$col,$dir)
{   
$this->rmi_db->select (" 
    $this->table_dev.id,
    $this->table_dev.fl,
    $this->table_dev.mm,
    $this->table_dev.mm, CAST($this->table_dev.mm as SIGNED) AS casted_column,//changed
    $this->table_dev.batch,
    $this->table_dev.n,
    $this->table_dev.ditta,
    $this->table_dev.tipo,
    $this->table_dev.costruzione,
    $this->table_dev.motori,
    $this->table_dev.nc,
    $this->table_dev.serie,
    $this->table_dev.ca,
    $this->table_dev.consegna,
    $this->table_dev.matr_usaf AS usaf,
    $this->table_dev.matr_usn AS usn,
    $this->table_dev.matr_caf AS caf,
    $this->table_dev.matr_raf AS raf,
    $this->table_dev.codici,
    $this->table_dev.note,
    $this->table_dev.reg_civili,
    $this->table_dev.matricola_civ,
    $this->table_dev.prima_reg,
    $this->table_dev.n_contratto,
    $this->table_dev.data_contratto,
    $this->table_dev.importo_contratto,
    $this->table_dev.note_contratto,
    $this->table_dev.f29,
    $this->table_dev.f30,     
    ");
$this->rmi_db->from("$this->table_dev");
$this->rmi_db->where("$this->table_dev.mm !=", "");
$this->rmi_db->limit($limit, $start);
$this->rmi_db->order_by($col, $dir);
$this->rmi_db->order_by('casted_column', 'ASC'); // changed
$this->rmi_db->order_by($this->table_dev.mm, 'ASC'); // changed
$query = $this->rmi_db->get(); //changed

if($query->num_rows()>0)
{
    return $query->result(); 
}
else
{
    return null;
}
}

comment if you face any issue