Union Order By Method

The union_order_by method is part of database class builder for sorting result query.

Basic Usage

Here is the basic usage union_order_by method from $db property on SENE_Model class.

$this->db->group_by(string $column_name, string $sort_direction): $this->db

Parameters

This method has 2 required parameters.

$column_name

The $column_name value can be filled by column name or function string.

$sort_direction

The $sort_direction value can be string like:

asc for ascending or,
desc for descending

Example

For example we assumed want to retrieve newest articles from blog table.

–

<?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();

    //2nd 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();

    //3nd 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();
  }
}