Metode Union Limit

Metode union_limit berfugsi menghasilkan perintah SQL LIMIT [A],[B] khusus untuk Union Query Buffer. Metode ini juga cocok untuk membuat pagination.

Bentuk Umum

Berikut ini adalah bentuk umum metode union_limit dari properti $db yang ada di kelas SENE_Model.

–

$this->db->union_limit(int $a, int $b): $this->db

Parameter

Metode ini terdiri dari 2 parameter wajib

$a

Nilai $a dapat berupa nol atau bilangan bulat positif untuk menentukan offset dari baris pertama yang akan dikembalikan.

$b

Nilai $b dapat berupa nol atau bilangan bulat positif untuk menentukan jumlah maksimum baris yang akan dikembalikan.

Contoh

Berikut adalah implementasi kode sumber dari metode union_limit di kelas model.

–

<?php
class Blog_Model extends SENE_Model{
  var $tbl = 'd_blog';
  var $tbl_as = 'b';

  public function __construct(){
    parent::__construct();
    $this->db->from($this->tbl,$this->tbl_as);
  }
  public function searchByScore($keyword){
    $this->db->union_flush();

    //1st union
    $this->db->select('id');
    $this->db->select('title');
    $this->db->select('excerpt');
    $this->db->select('date_modified');
    $this->db->select_as("3",'score');
    $this->db->from($this->tbl,$this->tbl_as);
    $this->db->where('title',$keyword,'or','like',1,0);
    $this->db->where('excerpt',$keyword,'or','like',0,1);
    $this->db->union_create();

    //2nd union
    $this->db->select('id');
    $this->db->select('title');
    $this->db->select('excerpt');
    $this->db->select('date_modified');
    $this->db->select_as("2",'score');
    $this->db->from($this->tbl,$this->tbl_as);
    $this->db->where('title',$keyword,'or','like%',1,0);
    $this->db->where('excerpt',$keyword,'or','like%',0,1);
    $this->db->union_create();

    //3rd union
    $this->db->select('id');
    $this->db->select('title');
    $this->db->select('excerpt');
    $this->db->select('date_modified');
    $this->db->select_as("1",'score');
    $this->db->from($this->tbl,$this->tbl_as);
    $this->db->where('title',$keyword,'or','%like',1,0);
    $this->db->where('excerpt',$keyword,'or','%like',0,1);
    $this->db->union_create();

    //4th union
    $this->db->select('id');
    $this->db->select('title');
    $this->db->select('excerpt');
    $this->db->select('date_modified');
    $this->db->select_as("0",'score');
    $this->db->from($this->tbl,$this->tbl_as);
    $this->db->where('title',$keyword,'or','%like%',1,0);
    $this->db->where('excerpt',$keyword,'or','%like%',0,1);
    $this->db->union_create();

    $this->db->union_select('id,title,date_modified,score','score');
    $this->db->union_group_by('id');
    $this->db->union_order_by('score','desc')->union_limit(1, 14);
    return $this->db->union_get();
  }
}

Metode Union Group By

Metode Union Order By