codeigniter - having issues with Error Number: 1064 -

any time try access page created says:

error number: 1064

you have error in sql syntax; check manual corresponds mysql server version right syntax use near '' @ line 3

select * (`_db_tb_article`) `article_id` = 

filename:

c:\xampp\htdocs\gtech\__ghtec__$y$tem__core\database\db_driver.php 

line number:

330 

this model

<?php  class article_model extends ci_model {   function add() {      $this->db->insert('article',$_post);      if($this->db->_error_number()){          return $this->db->_error_number();      } }  function update($article_id, $data_fields = null){      if($data_fields == null){         $this->db->where("article_id =".$article_id);         $this->db->update('article',$_post);      }else{         $this->db->where("article_id =".$article_id);         $this->db->update('article',$data_fields);     }      $is_error = $this->db->_error_number();     if($is_error){        echo $is_error;     }     return true; }  function delete($id){      $this->db->where("article_id =".$id);       return $this->db->delete('article'); }  //return article id function get_article($id){     $this->db->where("article_id =".$id);     $query = $this->db->get('article');      if ($query->num_rows() > 0){        return $query->row_array();    }    else {      echo $this->db->_error_message();      return false;    } }  //return available article in table function get_article_all(){      $query = $this->db->get('article');     if ($query->num_rows() > 0){        foreach($query->result() $row){            $result[]    =   $row;        }        return $result;    } }  } 

i have checked line 330 , can't seem find way solve problem... need help

in statement

function update

$this->db->where("article_id =".$article_id); 

should be

$this->db->where('article_id', $article_id); 

function get_article

$this->db->where("article_id =".$id); 

should be

$this->db->where('article_id', $id); 

function delete

$this->db->where("article_id =".$id); 

should be

$this->db->where('article_id', $id);