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Let s move on to data persistence now. The notes that a user creates are saved to an actual database on the device. Specifically, the Notepad application s backing store is a SQLite database. The managedQuery() method that we discussed earlier eventually resolves to data in a database, via a content provider. Let s examine how the URI, passed to managedQuery(), results in the execution of a query against a SQLite database. Recall that the URI passed to managedQuery() looks like this: public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/notes"); Content URIs always have this form: content://, followed by the authority, followed by a general segment (context-specific). Because the URI doesn t contain the actual data, it somehow results in the execution of code that produces data. What is this connection How is the URI reference resolved to code that produces data Is the URI an HTTP service or a web service Actually, the URI, or the authority portion of the URI, is configured in the AndroidManifest.xml file as a content provider: <provider android:name="NotePadProvider" android:authorities="com.google.provider.NotePad"/> When Android sees a URI that needs to be resolved, it pulls out the authority portion of it and looks up the ContentProvider class configured for the authority. In the Notepad application, the AndroidManifest.xml file contains a class called NotePadProvider configured for the com.google.provider.NotePad authority. Listing 2-4 shows a small portion of the class. Listing 2-4. The NotePadProvider Class public class NotePadProvider extends ContentProvider { @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,String sortOrder) {} @Override public Uri insert(Uri uri, ContentValues initialValues) {} @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {} @Override public int delete(Uri uri, String where, String[] whereArgs) {} @Override public String getType(Uri uri) {} @Override public boolean onCreate() {} asp.net qr code generator ZXING.NET : QRCode Generator In ASP . NET Core 1.0 in C# for ... 15 May 2017 ... NET Core 1.0, using Zxing.Net. Background I tried to create a QR CodeGenerator in ASP . NET Core, using third party libraries but in most of the ... qr code generator in asp.net c# Create or Generate QR Code in Asp . Net using C# , VB.NET - ASP ... 16 Apr 2017 ... By using “Zxing.Net” library in asp . net we can easily generate and read QR codein c# , vb.net with example based on our requirements. There are several mechanisms available to change Rails; one of the most powerful is the plugin system. Any member of the Rails community can create new functionality and distribute it to other developers and, when it is proven valuable, may eventually see it incorporated into the core framework. This is the path REST took; it began as a plugin called simply_restful, written by core team member Rick Olson. Over time, the approach illustrated by the plugin code 128 c# library,rdlc upc-a,winforms ean 13,vb.net get pdf page count,c# ean 13 reader,rdlc qr code asp.net mvc generate qr code Generate a QR Code in ASP . NET C# without using a 3rd party ... I was able to do this on the server using ZXing. Net and exposing an endpoint viaa controller(MVC or Web API). The endpoint would receive data via query string ... asp.net mvc qr code QR Code generation in ASP . NET MVC - Stack Overflow So, on your page (assuming ASPX view engine) use something like this: ... publicstatic MvcHtmlString QRCode (this HtmlHelper htmlHelper, string .... http://www.esponce.com/api/v3/ generate ?content=Meagre+human+needs ... 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" + ");"); } // } asp.net vb qr code How To Generate QR Code Using ASP . NET - C# Corner 24 Nov 2018 ... This blog will demonstrate how to generate QR code using ASP . NET . Create an empty web project in the Visual Studio version of your choice. Add Web Form, right-click on the project, select Add New Item, choose web form, give it a name and click on Add. Add script and styles in web form head section. generate qr code asp.net mvc ASP . Net MVC : Dynamically generate and display QR Code Image 4 Dec 2017 ... The QR Code Image will be dynamically generated in ASP . Net MVC Razor using the QRCoder library which is an Open Source Library QR code generator . You will need to download the QRCoder library from the following location and open the project in Visual Studio and build it. app/controllers app/helpers app/models app/views/layouts config/environments components db doc lib lib/tasks log public/images public/javascripts public/stylesheets script/performance script/process test/fixtures test/functional test/integration test/mocks/development test/mocks/test test/unit vendor vendor/plugins tmp/sessions tmp/sockets tmp/cache tmp/pids Rakefile README app/controllers/application.rb app/helpers/application_helper.rb test/test_helper.rb config/database.yml config/routes.rb public/.htaccess config/boot.rb config/environment.rb config/environments/production.rb config/environments/development.rb config/environments/test.rb script/about script/breakpointer script/console script/destroy 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. asp.net create qr code Create or Generate QR Code in Asp . Net using C#, VB .NET - ASP ... 16 Apr 2017 ... Net library in c#, vb .net with example. By using “Zxing.Net” library in asp . net wecan easily generate and read QR code in c#, vb .net with ... asp.net qr code generator Easy QR Code Creation in ASP . NET MVC - MikeSmithDev 11 Oct 2014 ... NET MVC and I wanted the QR Code generation to be easy. ... In my next post, Icover an alternative way to generate a QR code using a vanilla ... birt ean 13,.net core barcode generator,birt upc-a,asp net core barcode scanner
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