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Models: Accessing Data in Java Insert code-128c in Java Models: Accessing Data




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Models: Accessing Data use awt barcode code 128 maker toinsert barcode 128 with java Microsoft Windows SDK When the for Code 128 Code Set B for Java m is filled up and submitted, all form data is sent back to the BooksController"s add() action. Inside the controller action, the submitted form data can be found through the controller attribute $this->data. The condition if (!empty($this->data)) will now return a true (as $this->data is now filled up with the submitted form data).

And code inside the if{} block will now get executed. Inside the block, we called the Book model"s create() method first. And right after that we called the model method save() with the parameter $this->data (that holds the data sent back from the form):.

$this->Bo ok->create(); $this->Book->save($this->data);. It is import jvm barcode standards 128 ant to call the model"s create() method just ahead of calling the model"s save() method if the intention is to create a new record.. The save() m ethod creates a new record in the database table books with data passed into it. When the save operation is done, controller sets a flash message saying Book is saved! using the Session component"s setFlash() method. Then, it redirects to the index() action of the BooksController.

The newly added book can now be seen in the list of books. A flash message will appear on top of that list notifying us that the new book is stored successfully in the database table..

[ 94 ]. 5 . The save() m Code 128 Code Set C for Java ethod is not used only for creating new record in the database table, it can also be used for updating an existing record. We will now see how the same old save() method can be used to modify an already stored record..

Updating a Record Updating rec Code-128 for Java ords is one of the four basic database operations that are very commonly used in almost all data intensive web applications. We will now see how to use CakePHP"s built-in model method save() to update an existing record in the database..

Time for Action: Updating a Database Record < php cla applet Code 128 Code Set C ss BooksController extends AppController { var $name = "Books"; var $helpers = array("Form" );. 1. Inside th e BooksController (/app/controllers/books_controller.php), write a new action named edit(),.

function ind swing USS Code 128 ex() { $books = $this->Book->find("all", array( "fields" => array( "Book.id", "Book.isbn", "Book.

title", "Book.author_name" ), "order" => "Book.title ASC" ) ); $this->set("books", $books); } function add() { if (!empty($this->data)) { $this->Book->create(); if(!!$this->Book->save($this->data)) { $this->Session->setFlash("Book is Saved!", true); $this->redirect(array("action"=>"index")); } } } [ 95 ].

Models: Acce ssing Data function edit($id=null) { if (!$id && empty($this->data)) { $this->Session->setFlash("Invalid Book", true); $this->redirect(array("action"=>"index")); } if (empty($this->data)) { $this->data = $this->Book->read(null, $id); } else { $this->Book->create(); if(!!$this->Book->save($this->data)) { $this->Session->setFlash("Book is Updated!", true); $this->redirect(array("action"=>"index"), null, true); } } }. 2. Create a j2ee Code 128A view for the action "/books/edit" (/app/views/edit.ctp).

. < php ech o $form->create("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"); >. 3. Inside th Code 128B for Java e view file of the /books/index action (/app/views/books/index. ctp) add an edit link next to the author names:.

<table> ; <thead> <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> [ 96 ]. 5 <td> Code 128A for Java ;< php echo $book["Book"]["title"] ></td> <td>< php echo $book["Book"]["author_name"] ></td> <td>< php echo $html->link("edit","edit/".$book["Book"]["id"]) ></td> </tr> < php endforeach; > </table>. 4. Point you r browser to the following URL and click on an edit button next to a book http://localhost/data-access/books/. It should show you a form where we can edit the book information.

Modify some information and hit submit to update the database record.. What Just Happened In the Books Controller, we first added a new action named edit() that can take a parameter named $id. The first if{} block inside the action only gets executed when the $id parameter is empty and there is no form data sent back from the view..

if (!$id && jar Code128 empty($this->data)) { $this->Session->setFlash("Invalid Book", true); $this->redirect(array("action"=>"index")); }. In that case , we set a flash message to notify the user that the request is invalid and redirect them to the /books/index action. Note the redirect() method by default exits just after the redirection. And hence the rest of the part of the code inside that action gets executed only when the $id parameter is not empty or some form data is sent back to the action from the view.

. if (empty($t jar barcode code 128 his->data)) { $this->data = $this->Book->read(null, $id); } else { $this->Book->create(); if(!!$this->Book->save($this->data)) { $this->Session->setFlash("Book Updated!", true); $this->redirect(array("action"=>"index"), null, true); } }. When there i s no form data, the if (empty($this->data)) condition returns a true and the following code gets executed:. $this->da applet Code128 ta = $this->Book->read(null, $id); [ 97 ].
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