php - 如何使用codeigniter删除数据库中的事件记录

Question

Controller :

public function delete()
{
    $id=$this->uri->segment(3);
    $this->book_model->deletepost($id);
    $data['books']=$this->book_model->getposts();
    $this->load->view('showbooks',$data);
}

型号:

public function getposts()
{
  $posts=$this->db->get('books');
  $books=array();
  foreach ($posts->result() as $row) 
  {
    $books=array(
      'book_id' => $row->bookid,
      'book_name' => $row->booktitle,
      'book_author' => $row->bookauthor,
      'book_year' => $row->bookyear,
      'book_isbn' => $row->bookisbn,
      'book_publisher' => $row->bookpublisher
    );
  }
  return $books;
}

public function deletepost($id)
{
  $this->db->where('id',$id);
  $this->db->delete('books');
}

问题是我无法删除记录。这是错误:“where 子句”中的未知列“id”

DELETE FROM `books` WHERE `id` = 0

Answer 1

当您获得帖子时，列名称是 book_id。当你删除的是id。所以也许您需要将其更改为 book_id。

此外，在这种情况下，$this->uri->segment(3) 将返回 null，因为 function delete() 没有参数。更多详情请阅读 here

但我会做一些改变:

Controller :

public function delete()
{
    $id=$this->uri->segment(3); // Try to write any id here, or in function put parameter
    $this->book_model->deletepost($id);
    $data['books']=$this->book_model->getposts();
    $this->load->view('showbooks',$data);
}

型号:

public function getposts() {
  return $this->db->get('books')->result_array();
}

public function deletepost($id) {
  $this->db->where('book_id',$id); // I change id with book_id
  $this->db->delete('books');
}