Jinjinov / IndexedDB.Blazor

A Blazor library for accessing IndexedDB

IndexedDB.Blazor

An easy way to interact with IndexedDB and make it feel like EF Core but async.

Version history

• 1.1.1:
  • Upgraded from .NET Core 3.0.0-preview to .NET Core 3.2.1
  • Upgraded form netstandard2.0 to netstandard2.1
  • Upgraded form C# 7.3 to C# 8.0
  • Upgraded TG.Blazor.IndexedDB from 0.9.0-beta to 1.5.0-preview
  • Changed namespace Blazor.IndexedDB.Framework to namespace IndexedDB.Blazor
  • Changed private IndexedDBManager connector; to protected IndexedDBManager connector; in IndexedDb
  • Changed IndexedSet<T> : IEnumerable<T> to IndexedSet<T> : ICollection<T>
• 1.0.1:
  • Original code by Reshiru
  • Original repository at Blazor.IndexedDB.Framework

NuGet installation

The NuGet package is at: https://www.nuget.org/packages/IndexedDB.Blazor

Either install it from command line:

PM> Install-Package IndexedDB.Blazor

Or include it in your project file:

<PackageReference Include="IndexedDB.Blazor" Version="1.1.1" />

Features

• Connect and create database
• Add record
• Remove record
• Edit record

How to use

1. Add TG.Blazor.IndexedDB/indexedDb.Blazor.js to your index.html

<script src="_content/TG.Blazor.IndexedDB/indexedDb.Blazor.js"></script>

2. Register IndexedDbFactory as a service.

services.AddSingleton<IIndexedDbFactory, IndexedDbFactory>();

• IIndexedDbFactory is used to create the database connection and will create the database instance for you.

• IndexedDbFactory requires an instance of IJSRuntime which should normally already be registered.

3. Create any code first database model and inherit from IndexedDb. Only properties with the type IndexedSet<> will be used, any other properties will be ignored.

public class ExampleDb : IndexedDb
{
  public ExampleDb(IJSRuntime jSRuntime, string name, int version) : base(jSRuntime, name, version) { }
  public IndexedSet<Person> People { get; set; }
}

• Your model (eg. Person) should contain an Id property or a property marked with the Key attribute.

public class Person
{
  [System.ComponentModel.DataAnnotations.Key]
  public long Id { get; set; }
  public string FirstName { get; set; }
  public string LastName { get; set; }
}

4. Now you can start using your database.

• Usage in Razor via inject: @inject IIndexedDbFactory DbFactory

Adding records

using (var db = await this.DbFactory.Create<ExampleDb>())
{
  db.People.Add(new Person()
  {
    FirstName = "First",
    LastName = "Last"
  });
  await db.SaveChanges();
}

Removing records

To remove an element it is faster to use an already created reference. You should also be able to remove an object only by it's Id but you have to use the .Remove(object) method (eg. .Remove(new object() { Id = 1 }))

using (var db = await this.DbFactory.Create<ExampleDb>())
{
  var firstPerson = db.People.First();
  db.People.Remove(firstPerson);
  await db.SaveChanges();
}

Modifying records

using (var db = await this.DbFactory.Create<ExampleDb>())
{
  var personWithId1 = db.People.Single(x => x.Id == 1);
  personWithId1.FirstName = "This is 100% a first name";
  await db.SaveChanges();
}

License

Original license.

Licensed under the MIT license.