![]() Sometimes it's a little slower, sometimes it's a little faster. These benchmarks show that SQLite Wasm is generally about as fast as Web SQL. The SQLite team have run some benchmarks on their WebAssembly implementation compared to the deprecated Web SQL. If you inspect the traffic with DevTools, you should find the following information: # Speedtest The reason for these headers is that SQLite Wasm depends on SharedArrayBuffer, and setting these headers is part of its security requirements. Cross-Origin-Embedder-Policy set to the require-corp directive, so a document can only load resources from the same origin, or resources explicitly marked as loadable from another origin.Cross-origin documents are not loaded in the same browsing context. ![]() Cross-Origin-Opener-Policy set to the same-origin directive, which isolates the browsing context exclusively to same-origin documents.Browsers will not serve Wasm files from file:// URLs, so any apps you build with this require a web server and that server must include the following headers in its response when serving the files: The jswasm directory contains the core sqlite3 deliverables and the top-level directory contains demonstration and test apps. Setting these headers is a required step for the Origin Private File System persistence backend to work.Īmong other files, the downloaded SQLite Wasm archive contains the sqlite3.js and sqlite3.wasm files, which make up the sqlite3 WASM/JS build. The synchronous nature of this method brings performance advantages, but therefore it is only usable inside dedicated Web Workers for files within the Origin Private File System so the main thread can't be blocked. ![]() This method returns a Promise which resolves to a FileSystemSyncAccessHandle object that can be used to synchronously read from and write to a file. This is where the Origin Private File System, and, more specifically, the createSyncAccessHandle() method of FileSystemFileHandle objects comes into play. This change, along with the ability to consistently read unflushed modifications and the availability of a synchronous variant on dedicated workers, significantly improves performance and unblocks new use cases.Īs you can imagine, the last point of the project's goals, Support for persistent client-side storage using available JavaScript APIs, comes with strict performance requirements regarding persisting data to the database file. This new surface differs from existing ones by offering in-place and exclusive write access to a file's content. The Origin Private File System (OPFS, part of the File System Access API) is augmented with a special surface that brings very performant access to data. Install the package from npm with the following command: npm install # The Origin Private File System # Using SQLite Wasm with the Origin Private File System persistence backend # Installing the library from npm Support for persistent client-side storage using available JavaScript APIs, including the Origin Private File System (OPFS).A Promise-based variant of the Worker API which entirely hides the cross-thread communication aspects from the user.This one is intended for use in the main thread, with the lower-level APIs installed in a Worker thread, and talking to them via Worker messages. A Worker-based API which speaks to the previous APIs via Worker messages.This API must be used from the same thread as the low-level API. A higher-level object-oriented API, more akin to sql.js and Node.js-style implementations, that speaks directly to the low-level API.Binding a low-level sqlite3 API which is as close to the C one as feasible in terms of usage.The concrete goals of this project include: The sqlite3 WASM/JS subproject is the first effort that is officially associated with the SQLite project making Wasm builds of the library established members of the family of supported SQLite deliverables. ![]() There are a number of unofficial SQLite versions based on Web Assembly (Wasm), allowing it to be used in web browsers, for example, sql.js. Instead, the database is stored in a single file on the user's device, making it easy to integrate into applications. One of the key features of SQLite is that it is a serverless database, which means that it does not require a separate server process to operate. Because of its small size and low memory requirements, SQLite is often leveraged as a database engine in mobile devices, desktop applications, and web browsers. Many developers use it to store data in a structured, easy-to-use manner. SQLite is a popular, open-source, lightweight, embedded relational database management system. The SQLite Wasm library with the Origin Private File System persistence backend is our fulfillment of this promise. In our blog post Deprecating and removing Web SQL, we promised a replacement for Web SQL based on SQLite. ![]()
0 Comments
Leave a Reply. |