CodeIgniter ActiveRecord问题

Question

我想在CodeIgniter上构建我的第一个应用程序。这也是我第一次尽可能地坚持OOP和MVC。到目前为止一切都很顺利，但现在我正在尝试编写我的第一个模型，我遇到了一些麻烦。下面是我得到的错误：

数据库出错

错误编号：1064

您的SQL语法错误;检查对应于你的MySQL服务器版本在线路附近使用 'Castledine' 3

SELECT * FROM（authors）正确的语法手册WHERE author =厄尔Castledine

其中，因为你会见下面，涉及我的模型中的以下行：

$this->db->get_where('authors', array('author' => $author)); 

我不太清楚为什么它会抛出错误。这是否因为厄尔卡斯汀没有被引用？如果是这样，为什么CI没有把它们放在那里呢？我怀疑这是问题所在，而不是认为这是我的错，但我不确定。

我还有另一个问题。标签和作者都没有插入到它们各自的表格中。他们的insert语句被包装在一个条件中，应该确保它们不存在，但它似乎失败了，并且插入从不发生。我认为它是失败的，因为标签没有被放入数据库中，并且在它抛出错误之前它已经在作者部分被关闭了。我知道如何用纯PHP做到这一点，但我试图去做它纯粹的CI ActiveRecord方式。

下面是我使用的语句：

if ($this->db->count_all_results() == 0) 

而且我使用什么，而不是我通常使用：

if (mysql_num_rows() == 0) 

我是不是做错了？

这里是我的模型和控制器（只有重要的功能），尽我所能评论。

型号：

function new_book($book, $tags, $authors, $read) { 

    // Write book details to books table 
    $this->db->insert('books', $book); 

    // Write tags to tag table and set junction 
    foreach ($tags as $tag) { 
     // Check to see if the tag is already in the 'tags' table 
     $this->db->get_where('tags', array('tag' => $tag)); 
     // trying to use this like mysql_num_rows() 
     if ($this->db->count_all_results() == 0) { 
      // Put it there 
      $this->db->insert('tags', $tag); 
     } 
     // Set the junction 
     // I only need the id, so... 
     $this->db->select('id'); 
     // SELECT id FROM tags WHERE tag = $tag 
     $query = $this->db->get_where('tags', array('tag' => $tag)); 
     // INSERT INTO books_tags (book_id, tag_id) VALUES ($book['isbn'], $query->id) 
     $this->db->insert('books_tags', array('book_id' => $book['isbn'], 'tag_id' => $query->id)); 
    } 

    // Write authors to author table and set junction 
    // Same internal comments apply from tags above 
    foreach ($authors as $author) { 
     $this->db->get_where('authors', array('author' => $author)); 
     if ($this->db->count_all_results() == 0) { 
      $this->db->insert('authors', $author); 
     } 
     $this->db->select('id'); 
     $query = $this->db->get_where('authors', array('author' => $author)); 
     $this->db->insert('authors_books', array('book_id' => $book['isbn'], 'author_id' => $query)); 
    } 

    // If the user checked that they've read the book 
    if (!empty($read)) { 
     // Get their user id 
     $user = $this->ion_auth->get_user(); 
     // INSERT INTO books_users (book_id, tag_id) VALUES ($book['isbn'], $user->id) 
     $this->db->insert('books_users', array('book_id' => $book['isbn'], 'user_id' => $user->id)); 
    } 

} 

控制器：

function confirm() { 

    // Make sure they got here by form result, send 'em packing if not 
      $submit = $this->input->post('details'); 
    if (empty($submit)) { 
     redirect('add'); 
    } 

      // Set up form validation 
    $this->load->library('form_validation'); 
    $this->form_validation->set_error_delimiters('<h3 class="error">', ' Also, you&rsquo;ll need to choose your file again.</h3>'); 
    $this->form_validation->set_rules('isbn','ISBN-10','trim|required|exact_length[10]|alpha_numeric|unique[books.isbn]'); 
    $this->form_validation->set_rules('title','title','required'); 
    $this->form_validation->set_rules('tags','tags','required'); 

      // Set up upload 
    $config['upload_path'] = './books/'; 
    $config['allowed_types'] = 'pdf|chm'; 
    $this->load->library('upload', $config); 

      // If they failed validation or couldn't upload the file 
    if ($this->form_validation->run() == FALSE || $this->upload->do_upload('file') == FALSE) { 
     // Get the book from Amazon 
        $bookSearch = new Amazon(); 
     try { 
      $amazon = $bookSearch->getItemByAsin($this->input->post('isbn')); 
     } catch (Exception $e) { 
      echo $e->getMessage(); 
     } 
        // Send them back to the form 
     $data['image'] = $amazon->Items->Item->LargeImage->URL; 
     $data['content'] = 'add/details'; 
     $data['error'] = $this->upload->display_errors('<h3 class="error">','</h3>'); 
     $this->load->view('global/template', $data); 

      // If they did everything right 
      } else { 
        // Get the book from Amazon 
     $bookSearch = new Amazon(); 
     try { 
      $amazon = $bookSearch->getItemByAsin($this->input->post('isbn')); 
     } catch (Exception $e) { 
      echo $e->getMessage(); 
     } 

     // Grab the file info 
        $file = $this->upload->data(); 

     // Prep the data for the books table 
        $book = array(
      'isbn' => $this->input->post('isbn'), 
      'title' => mysql_real_escape_string($this->input->post('title')), 
      'date' => $amazon->Items->Item->ItemAttributes->PublicationDate, 
      'publisher' => mysql_real_escape_string($amazon->Items->Item->ItemAttributes->Publisher), 
      'pages' => $amazon->Items->Item->ItemAttributes->NumberOfPages, 
      'review' => mysql_real_escape_string($amazon->Items->Item->EditorialReviews->EditorialReview->Content), 
      'image' => mysql_real_escape_string($amazon->Items->Item->LargeImage->URL), 
      'thumb' => mysql_real_escape_string($amazon->Items->Item->SmallImage->URL), 
      'filename' => $file['file_name'] 
     ); 

     // Get the tags, explode by comma or space 
        $tags = preg_split("/[\s,]+/", $this->input->post('tags')); 
        // Get the authors 
        $authors = array(); 
        foreach ($amazon->Items->Item->ItemAttributes->Author as $author) { 
         array_push($authors, $author); 
        } 
        // Find out whether they've read it 
        $read = $this->input->post('read'); 
        // Send it up to the database 
        $this->load->model('add_model', 'add'); 
        $this->add->new_book($book, $tags, $authors, $read); 
        // For now... Later I'll load a view 
        echo 'Success'; 

    } 

} 

任何人都可以帮上什么，我做错了棚灯？非常感谢。

马库斯

Answer 1

我设法自己解决这个问题。该控制器并没有真正改变，但这里的新模式：

function new_book($book, $tags, $authors, $read) { 

    // Write book details to books table 
    $this->db->insert('books', $book); 

    // Write tags to tag table and set junction 
    foreach ($tags as $tag) { 
     // Check to see if the tag is already in the 'tags' table 
     $query = $this->db->get_where('tags', array('tag' => $tag)); 
     // trying to use this like mysql_num_rows() 
     if ($query->num_rows() == 0) { 
      // Put it there 
      $this->db->insert('tags', array('tag' => $tag)); 
     } 
     // Set the junction 
     // I only need the id, so... 
     $this->db->select('id'); 
     // SELECT id FROM tags WHERE tag = $tag 
     $query = $this->db->get_where('tags', array('tag' => $tag)); 
     $result = $query->row(); 
     // INSERT INTO books_tags (book_id, tag_id) VALUES ($book['isbn'], $query->id) 
     $this->db->insert('books_tags', array('book_id' => $book['isbn'], 'tag_id' => $result->id)); 
    } 

    // Write authors to author table and set junction 
    // Same internal comments apply from tags above 
    foreach ($authors as $author) { 
     $query = $this->db->get_where('authors', array('author' => mysql_real_escape_string($author))); 
     if ($query->num_rows() == 0) { 
      $this->db->insert('authors', array('author' => mysql_real_escape_string($author))); 
     } 
     $this->db->select('id'); 
     $query = $this->db->get_where('authors', array('author' => mysql_real_escape_string($author))); 
     $result = $query->row(); 
     $this->db->insert('authors_books', array('book_id' => $book['isbn'], 'author_id' => $result->id)); 
    } 

    // If the user checked that they've read the book 
    if (!empty($read)) { 
     // Get their user id 
     $user = $this->ion_auth->get_user(); 
     // INSERT INTO books_users (book_id, tag_id) VALUES ($book['isbn'], $user->id) 
     $this->db->insert('books_users', array('book_id' => $book['isbn'], 'user_id' => $user->id)); 
    } 

} 

Answer 2

如果您正在使用count_all_results（），我想你的意思是使用NUM_ROWS（）。 count_all_results（）实际上会创建一个SELECT COUNT（*）查询。

用于调试您的问题...
如果你想测试是否插入（）的工作，用affected_rows()，例如：

var_dump($this->db->affected_rows()); 

在任何时候，你可以输出与last_query()最后的查询，例如什么：

var_dump($this->db->last_query()); 

你可以还打开Profiler，所以你可以看到所有的查询正在运行，通过在控制器中加入：

$this->output->enable_profiler(TRUE);