SoloDB 0.0.17

SoloDB

SoloDB is a light, fast and robust NoSQL and SQL embedded .NET database built on top of SQLite using the JSONB data type.

Features

Imagine the power of MongoDB and SQL combined.

• SQLite at the core.
• Serverless, it is a .NET library.
• Simple API, similar to LiteDB, see the below.
• Thread safe using a connection pool.
• ACID with full transaction support.
• File System for large files storage.
• Support for polymorphic types.
• Reliable with a WAL log file.
• Support for indexes for fast search.
• LINQ-like queries.
• Direct SQL support.
• Open source.
• .NET Standard 2.0
• Pretty well tested: 210+ of tests, but in the tradition of SQLite, we keep them private.

How to install

From NuGet

dotnet add package SoloDB

Usage

Initializing the Database

You can specify either a file path or an in-memory database.

using var onDiskDB = new SoloDB("path/to/database.db");
using var inMemoryDB = new SoloDB("memory:database-name");

Creating and Accessing Collections

var myCollection = db.GetCollection<User>();
var untypedCollection = db.GetUntypedCollection("User");

Checking Collection Existence

var exists = db.CollectionExists<User>();

Dropping Collections

db.DropCollection<User>();
db.DropCollectionIfExists<User>();
db.DropCollection("User");
db.DropCollectionIfExists("User");

Transactions

Use the WithTransaction method to execute a function within a transaction.

db.WithTransaction(tx => {
    var collection = tx.GetCollection<ulong>();
    // Perform operations within the transaction.
    collection.Insert(420);    
    throw null; // Simulate a fail.
});
...
db.CollectionExists<long>() // False.

Direct SQLite access using Dapper

using var pooledConnection = db.Connection.Borrow();
pooledConnection.Execute(
"CREATE TABLE Users (\r\n    Id INTEGER PRIMARY KEY,\r\n    Name TEXT,\r\n    Age INTEGER\r\n)");

// Create a new user
var insertSql = "INSERT INTO Users (Name, Age) VALUES (@Name, @Age) RETURNING Id;";
var userId = pooledConnection.QuerySingle<long>(insertSql, new { Name = "John Doe", Age = 30 });
Assert.IsTrue(userId > 0, "Failed to insert new user.");

Backing Up the Database

You can create a backup of the database using the BackupTo or VacuumTo methods.

db.BackupTo(otherDb);
db.VacuumTo("path/to/backup.db");

Optimizing the Database

The Optimize method can optimize the database using statistically information, it runs automatically on startup.

db.Optimize();

File storage

var fs = db.FileSystem;

// Supports directories.
var directory = fs.GetOrCreateDirAt("/example");

// Supports directory metadata.
fs.SetDirectoryMetadata(directory, "key", "value");
        
fs.Upload("/example/file.txt", new MemoryStream(randomBytes));
        
// Supports sparse files.
fs.WriteAt("/example/file.txt", /* offset */ 1000000, randomBytes, /* create if inexistent */true);

// Supports file metadata.
fs.SetMetadata("/example/file.txt", "key", "value");


using var toStream = new MemoryStream();
fs.Download("/example/file.txt", toStream);
var read = fs.ReadAt("/example/file.txt", 1000000, randomBytes.Length);

Assert.IsTrue(read.SequenceEqual(randomBytes));

var file = fs.GetOrCreateAt("/example/file.txt");

// Can list files and directories.
var fileFromListing = fs.ListFilesAt("/example/").First();
        
// Automatic SHA1 hashing.
Assert.IsTrue(file.Hash.SequenceEqual(fileFromListing.Hash));

var fileByHash = fs.GetFileByHash(fileFromListing.Hash);

Example Usage

Here is an example of how to use SoloDB to manage a collection of documents in C#:

SoloDB

using SoloDatabase;
using SoloDatabase.Types;

public class MyType
{
    public SqlId Id { get; set; }
    public string Name { get; set; }
    public string Data { get; set; }
}


let db = new SoloDB("./mydatabase.db")
var collection = db.GetCollection<MyType>();

// Insert a document
var docId = collection.Insert(new MyType { Id = 0, Name = "Document 1", Data = "Some data" });

// Or

var data = new MyType { Id = 0, Name = "Document 1", Data = "Some data" };
collection.Insert(data);
Console.WriteLine("{0}", data.Id); // 2

// Query all documents into a C# list
var documents = collection.Select().OnAll().Enumerate().ToList();

// Query the Data property, where Name starts with 'Document'
var documentsData = collection.Select(d => d.Data).Where(d => d.Name.StartsWith("Document")).Enumerate().ToList();

data.Data = "Updated data";

// Update a document
collection.Update(data);

// Delete a document
var count = collection.DeleteById(data.Id); // 1

MongoDB

using MongoDB.Bson;
using MongoDB.Driver;

public class MyType
{
    public ObjectId Id { get; set; }
    public string Name { get; set; }
    public string Data { get; set; }
}

var client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("mydatabase");
var collection = database.GetCollection<MyType>("MyType");

// Insert a document
var newDocument = new MyType { Name = "Document 1", Data = "Some data" };
collection.InsertOne(newDocument);
Console.WriteLine(newDocument.Id);

// Query all documents into a C# list
var documents = collection.Find(FilterDefinition<MyType>.Empty).ToList();

// Query the Data property, where Name starts with 'Document'
var filter = Builders<MyType>.Filter.Regex("Name", new BsonRegularExpression("^Document"));
var documentsData = collection.Find(filter).Project(d => d.Data).ToList();

newDocument.Data = "Updated data";

// Update a document
collection.ReplaceOne(d => d.Id == newDocument.Id, newDocument);

// Delete a document
var deleteResult = collection.DeleteOne(d => d.Id == newDocument.Id);
Console.WriteLine(deleteResult.DeletedCount); // 1

And in F#:

SoloDB

[<CLIMutable>]
type MyType = { Id: SqlId; Name: string; Data: string }

let db = new SoloDB("./mydatabase.db")
let collection = db.GetCollection<MyType>()
        
// Insert a document
let docId = collection.Insert({ Id = SqlId(0); Name = "Document 1"; Data = "Some data" })
        
// Or
        
let data = { Id = SqlId(0); Name = "Document 1"; Data = "Some data" }
collection.Insert(data) |> ignore
printfn "%A" data.Id // 2
        
// Query all documents into a F# list
let documents = collection.Select().OnAll().ToList()
        
// Query the Data property, where Name starts with 'Document'
let documentsData = collection.Select(fun d -> d.Data).Where(fun d -> d.Name.StartsWith "Document").ToList()
        
let data = {data with  Data = "Updated data"}
        
// Update a document
collection.Update(data)
        
// Delete a document
let count = collection.DeleteById(data.Id) // 1

Licence

You can read the LICENSE.txt.

(FA)Q

Why create this project?

• For fun and profit, and to have a more simple alternative to MongoDB.

Footnote

API is subject to change.