Question

我正在开发需要唯一代码的应用程序，例如： TS001，TS0002，TS003

我有自动编码的PHP源代码，如下所示：

function autoNumber($tabel, $kolom, $lebar=0, $awalan) {
    $q = mysql_query("SELECT $kolom FROM  $tabel ORDER BY $kolom DESC LIMIT 1");
    $jum = mysql_num_rows($q);


    if($jum == 0) {
        $nomor = 1;
    } else {
        $data = mysql_fetch_array($q);
        $nomor = intval(substr($data[0],strlen($awalan))) + 1;
    }

    if($lebar > 0) {

        $angka = $awalan.str_pad($nomor,$lebar,"0",STR_PAD_LEFT);

    } else {

        $angka = $awalan.$nomor;
    }
    return $angka;

}

但是当我在Codeigniter上尝试时，我遇到了问题。

我在Codeigniter上的最新代码：

function autoNumber($tabel, $kolom, $lebar=0, $awalan) {
    $q = $this->db->query("SELECT $kolom FROM  $tabel ORDER BY $kolom DESC LIMIT 1");


    $this->db->order_by($kolom, "desc");
    $this->db->limit(1);
    $this->db->from('my_table');
    $data['jum'] = $this->db->count_all_results();


    foreach ($jum as $r) {
        # code...


    if($jum == 0) {
        $nomor = 1;
    } else {
        $data = mysql_fetch_array($q);
        $nomor = intval(substr($data[0],strlen($awalan))) + 1;
    }

    if($lebar > 0) {

        $angka = $awalan.str_pad($nomor,$lebar,"0",STR_PAD_LEFT);

    } else {

        $angka = $awalan.$nomor;
    }



    }

     return $angka;


}

Answer 1

您对db的来电有点困惑。试试这个：

function autoNumber($tabel, $kolom, $lebar=0, $awalan) {
    $this->db->order_by($kolom, "desc");
    $this->db->limit(1);
    $query = $this->db->get($tabel);
    $rows = $query->row();
    $jum = $query->num_rows();
    if ($jum == 0) {
      $nomor = 1;
    } else {
      $nomor = intval(substr($rows[0],strlen($awalan))) + 1;
    }
}

Answer 2

首先你的查询有ORDER BY $ kolom DESC LIMIT 1条款，你也在使用

 $this->db->order_by($kolom, "desc");
 $this->db->limit(1);

这不好，所以首先尝试设置您的查询

$this->db->select("$kolom);
$this->db->order_by($kolom, "desc");
$this->db->limit(1);
$this->db->from($tabel);
$query = $this->db->get();
$rslt = $query->result_array();

然后

$total_rec = $query->num_rows();
if ($total_rec == 0) {
    $nomor = 1;
} else {
    $nomor = intval(substr($rslt[0][$kolom],strlen($awalan))) + 1;
}

Codeigniter：如何制作自动编号

2 个答案: