The COMMIT occurs when the rollback journal is deleted.
A copy of the unchanged database content is written into a separate rollback file, then the changes are written directly to the database file. Write-ahead loggingīy default, SQLite uses a traditional rollback journal. The following sections cover features that are important for scalability.įor more information, see SQLite Documentation on. SQLite provides a robust API with more features than are covered in this article and the sample app. If (string.IsNullOrWhiteSpace(Item.Name))Īwait DisplayAlert("Name Required", "Please enter a name for the todo item.", "OK") Īlternatively, new instances of the database access class can be created: TodoItemDatabase database Public TodoItemPage(TodoItemDatabase todoItemDatabase)Īsync void OnSaveClicked(object sender, EventArgs e) These services can then be automatically injected into class constructors, and accessed: TodoItemDatabase database For example, you can register your pages and the database access class as services on the IServiceCollection object, in MauiProgram.cs, with the AddSingleton and AddTransient methods: () The TodoItemDatabase class can be registered as a singleton that can be used throughout the app if you are using dependency injection. Public async Task DeleteItemAsync(TodoItem item) Public async Task SaveItemAsync(TodoItem item) Return await Database.Table().Where(i => i.ID = id).FirstOrDefaultAsync() return await Database.QueryAsync("SELECT * FROM WHERE = 0") Return await Database.Table().Where(t => t.Done).ToListAsync() Public async Task> GetItemsNotDoneAsync() Return await Database.Table().ToListAsync() The following example shows the data manipulation methods in the sample app: public class TodoItemDatabase The SQLite.NET library provides a simple Object Relational Map (ORM) that allows you to store and retrieve objects without writing SQL statements. The TodoItemDatabase class includes methods for the four types of data manipulation: create, read, edit, and delete. Var result = await Database.CreateTableAsync() The TodoItemDatabase uses asynchronous lazy initialization to delay initialization of the database until it's first accessed, with a simple Init method that gets called by each method in the class: public class TodoItemDatabaseĭatabase = new SQLiteAsyncConnection(Constants.DatabasePath, Constants.Flags) The sample app defines a TodoItemDatabase class for this purpose. This class centralizes query logic and simplifies the management of database initialization, making it easier to refactor or expand data operations as the app grows. Create a database access classĪ database wrapper class abstracts the data access layer from the rest of the app. For more information about SQLiteOpenFlags, see Opening A New Database Connection on. You may need to specify different flags depending on how your database will be used.
#Using sqlitemanager install
In addition to sqlite-net-pcl, you temporarily need to install the underlying dependency that exposes SQLite on each platform:Ĭonfiguration data, such as database filename and path, can be stored as constants in your app. SQLite.NET is a third-party library that's supported from the praeclarum/sqlite-net repo.
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