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private static class DatabaseHelper extends SQLiteOpenHelper {} @Override public void onCreate(SQLiteDatabase db) {} @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { //... } } } Clearly, you can see that the NotePadProvider class extends the ContentProvider class. The ContentProvider class defines six abstract methods, four of which are CRUD (Create, Read, Update, Delete) operations. The other two abstract methods are onCreate() and getType(). onCreate() is called when the content provider is created for the first time. getType() provides the MIME type for the result set (you ll see how MIME types work when you read 3). The other interesting thing about the NotePadProvider class is the internal DatabaseHelper class, which extends the SQLiteOpenHelper class. Together, the two classes take care of initializing the Notepad database, opening and closing it, and performing other database tasks. Interestingly, the DatabaseHelper class is just a few lines of custom code (see Listing 2-5), while the Android implementation of SQLiteOpenHelper does most of the heavy lifting. Listing 2-5. The DatabaseHelper Class private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE " + NOTES_TABLE_NAME + " (" + Notes._ID + " INTEGER PRIMARY KEY," + Notes.TITLE + " TEXT," + Notes.NOTE + " TEXT," + Notes.CREATED_DATE + " INTEGER," + Notes.MODIFIED_DATE + " INTEGER" + ");"); } // } .net ean 13 reader . NET EAN - 13 Barcode Reader for C#, VB. NET , ASP. NET Applications
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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ... partial from within the forms. So, open up app/views/products/_form.rhtml again and add this code after the part that displays the product type: <p><label for="product_categories[]">Product Categories <span id="waitOut"></span></label><br/> <div id="categoriesSelector"> <%= render :partial => 'categories' %></div></p> Notice that you ve added a span that is empty, and a div tag that contains the output generated from the partial. You ll need these two elements later on for the Ajax-y parts of the system. But right now, you need to alter the products_controller.rb again, to make sure everything will be saved when you save a product. This is a little bit outside the box, because Rails doesn t handle these multiple selections out of the box. In the create method, you need to add this code directly after the call to Product.new: if params[:product_categories] @product.product_categories << ProductCategory.find( params[:product_categories].collect(&:to_i)) end This code adds all product_categories to the product, if there are any. You need to change the update method a little bit more, because you now have to make sure validation takes place. The new update method should look like this: def update @product = Product.find(params[:id]) intern_price if @product.update_attributes(params[:product]) if params[:product_categories] @product.product_categories = ProductCategory.find( params[:product_categories].collect(&:to_i)) end if @product.save flash[:notice] = 'Product was successfully updated.' redirect_to :action => 'show', :id => @product end end if !@product.valid @product_types = ProductType.find(:all) @product_categories = ProductCategory.find(:all) render :action => 'edit' end end The big difference here is that you check if the product is valid explicitly, because it can become invalid in two different places (in update_attributes, or save). You could do this in other ways, but that would mean you d have to duplicate code in the method. .net ean 13 reader Packages matching ean-13 - NuGet Gallery
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C# . NET EAN - 13 recognition reader control component is used to scan & read EAN - 13 barcode from image in C#. NET class applications. As shown in Listing 2-5, the onCreate() method creates the Notepad table. Notice that the class s constructor calls the superclass s constructor with the name of the table. The superclass will call the onCreate() method only if the table does not exist in the database. Also notice that one of the columns in the Notepad table is the _ID column we discussed in the section Dissecting the Application. Now let s look at one of the CRUD operations: the insert() method (see Listing 2-6). Listing 2-6. The insert() Method // SQLiteDatabase db = mOpenHelper.getWritableDatabase(); long rowId = db.insert(NOTES_TABLE_NAME, Notes.NOTE, values); if (rowId > 0) { Uri noteUri = ContentUris.withAppendedId( NotePad.Notes.CONTENT_URI, rowId); getContext().getContentResolver().notifyChange(noteUri, null); return noteUri; } The insert() method uses its internal DatabaseHelper instance to access the database and then inserts a notes record. The returned row ID is then appended to the URI and a new URI is returned to the caller. At this point, you should be familiar with how an Android application is laid out. You should be able to navigate your way around Notepad, as well as some of the other samples in the Android SDK. You should be able to run the samples and play with them. Now let s look at the overall lifecycle of an Android application. .net ean 13 reader . NET Barcode Scanner SDK | How to Read EAN - 13 Barcode in . NET ...
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