Models: Accessing Data in Java Deploy Code 128A in Java Models: Accessing Data

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Models: Accessing Data using jdk toincoporate code 128b in web,windows application ISO Specification This line actually returns th jsp Code-128 e record with the matching id as an associative array. The returned result is then set to the controller attribute $data. Just in case you are curious, the returned associative array from the read() method is in the common Cake format.

As an example, in our case, it would look something like the following:. Array ( [Book] => Array ( [id] => 1 [isbn] => 1904811299 [title] => Moodle E-Learning Course Development [description] => A complete guide...

[author_name] => William Rice ) ). The model method read($fields code128b for Java = null, $id = null) can take two parameters. The firs parameter $fields can be a string or an array specifying a single fieldname or a list of fieldnames that we want to select. When $fields is set to null, all fields are returned.

The second parameter specifies the id of the record we want to read. And it returns the record as an associative array having the common Cake format..

After setting up the controll er attribute $data with the record returned, the corresponding view file (/app/views/books/edit.ctp) is rendered. The view file has a form that is pretty much similar to the one that we wrote for the /books/add action.

The only difference is that it has a new input field for the field id.. < php echo $form->creat USS Code 128 for Java e("Book"); > <fieldset> <legend>Edit Book</legend> < php echo $form->input("id"); echo $form->input("isbn"); echo $form->input("title"); echo $form->input("description"); echo $form->input("author_name"); > </fieldset> < php echo $form->end("Submit"); >. It is interesting the way Cak e differentiates these two operations add and edit. When the id field is present in the web form, instead of adding a new record the model performs the update operation on the record with the specified id. Whereas when there is no input field specified in the form for the id field, it just carries out the usual add operation.

. [ 98 ]. 5 . We then edited the view file javabean code128b (/app/views/books/index.ctp) for the /books/index action. We added a new column in the table called action and added a new link labeled edit next to every author"s name there.

. <table> <thead> & lt;th>ISBN</th><th>Title</th><th>Author</th><th>Actions</th> </thead> < php foreach($books as $book): > <tr> <td>< php echo $book["Book"]["isbn"] ></td> <td>< php echo $book["Book"]["title"] ></td> <td>< php echo $book["Book"]["author_name"] ></td> <td>< php echo $html->link("edit", array("action"=>"edit", $book["Book"]["id"]) ) ></td> </tr> < php endforeach; > </table>. The edit link is created usin jboss Code-128 g the HtmlHelper"s link method that was discussed earlier in 3. These links point to the edit() action of the BooksController and contains the respective book ids as parameter. So, when someone clicks on the edit link of a book, it places a request to the /books/edit action and the id of the book is passed through the URL.

The edit action accepts the parameter as $id. The code inside the second if{} block gets executed. It reads the record with the matching id and sets it to the controller attribute $data, and a form shows up in the browser.

. [ 99 ]. Models: Accessing Data If the controller attribute $ data is set, FormHelper automatically fills up the form inputs with the data set in the $data attribute. Also notice that, the HTML input field created for the database table field id is a hidden form field. That is quite logical as while editing a record, we obviously must not edit its primary field.

The FormHelper is pretty intelligent, we must say! After editing, when the submit button is clicked, the form data is sent back to the edit action. Now, as the form data is not empty, the following piece of code gets executed:. $this->Book->create(); code-128b for Java if(!!$this->Book->save($this->data)) { $this->Session->setFlash("Book is Updated!", true); $this->redirect(array("action"=>"index"), null, true); }. This part of the code is very similar to what we have done for the /books/add action. We called the create() method of the Book model to prepare it for a save() operation. And then the save() method of the respective model is executed with the submitted form data as the parameter.

. If the id field is set in the Code-128 for Java supplied parameter, instead of inserting a new record, the save() method performs a database update operation on the record with matching id.. If the update is successful, it takes the user back to the /books/index action. A message on top of the table appears to confirm that the edit was successful and a new record shows up in the list of books..

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