We use the directory path to persist the SQLite database file there. After that, the File System API loads the directory in the browser’s database (IndexedDB).First, the DatabaseService class, which will be explained in more detail later in the article, triggers the initialization of the database.To really persist that database file, we have the option to use the WebAssembly-related File System API from Emscripten to store our file in the IndexedDB of our browser.īefore we start with the implementation, let’s look at how initialization of and persisting the database with the File System API works in our code. This is inconvenient for a database that should keep our data, and so we need to make sure that we actually save the in-memory file to a secure and persistent location. When we reload the tab, the file – and with it all of our precious data – will be lost. So while SQLite is storing our data in a file, this is currently only available in the memory of the current browser tab. As of today, all file IO operations that are compiled to Wasm using Emscripten, will be mapped to a virtual file system that only exists in-memory (MEMFS, see also here). The Wasm runtime in the browser, however, does not directly provide access to a persistent file system (yet). We already learned that we use a version of SQLite compiled to WebAssembly (Wasm). Using the Emscripten tool chain, it will create a static library file e_sqlite3.a (embedded SQLite v3) in your publish directory. The publishing process of our whole Blazor WASM application will result in compiling all native dependencies – in this case our SQLite database engine – to WebAssembly. Note: As of today, this pre-release package does only provide this WASM compilation step when you publish your application with dotnet publish (or use the publish option in Visual Studio). As we are targeting WebAssembly, the C implementation of SQLite needs to be compiled to this platform. This is essentially the same as if you would manually ship a platform-specific sqlite3.dll for Windows and a sqlite3.so for Linux with your application. iOS, Android, Windows, macOS, etc.), it will provide or even build the correct native SQLite library specific to the target platform of an application. As it is a portable class library and wants to provide support for all sorts of different platforms (i.e. The library SQLitePCLRaw.bundle_e_sqlite intents to supply a complete embedded version of SQLite for applications. For SQLite, we use the pre-release package SQLitePCLRaw.bundle_e_sqlite3.We can use SQLite with EF Core in the client by installing the following packages:
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