How to use preset databases in Xamarin.iOS projects

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Using default databases in Xamarin.iOS projects

When the developer has prepared a preset database file, you can add the database file to the project you created. This section uses default databases in Xamarin.iOS and Xamarin.Android projects, respectively.

Used in Xamarin.iOS projects

The specific steps for using a default database in a Xamarin.iOS project are as follows:

(1) create a Xamarin.iOS project such as iOSSQLiteDemo.

(2) drag the Documents.db database created in the previous section to the Resources folder of the iOSSQLiteDemo project.

(3) Open the ViewController.cs file, and copy or move the Documents.db database to the Documents directory, as follows:

Using Foundation;using System;using System.IO;using UIKit;namespace iOSSQLiteDemo {public partial class ViewController: UIViewController {public ViewController (IntPtr handle): base (handle) {} public override void ViewDidLoad () {base.ViewDidLoad () / / Perform any additional setup after loading the view, typically from a nib. Var projectBundle = NSBundle.MainBundle; var resourcePath = projectBundle.PathForResource ("Documents", "db"); var dirManager = NSFileManager.DefaultManager; string sqlitePath = Path.Combine (Environment.GetFolderPath (Environment.SpecialFolder.Personal), "MyDocuments.db"); Console.WriteLine ("database file directory: {0}", sqlitePath); NSError er = new NSError () DirManager.Copy (resourcePath, sqlitePath, out er); / / copy} public override void DidReceiveMemoryWarning () {base.DidReceiveMemoryWarning (); / / Release any cached data, images, etc that aren't in use. }}}

After running the program, the following is output in the output window:

Database file directory: / Users/mac/Library/Developer/CoreSimulator/Devices/77752D53-9F0F-400C-89BD-A88D1EFD910C/data/Containers/Data/Application/DBD889F8-BB9A-423A-A729-E659A794B18B/Documents/MyDocuments.db

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