Overview

Definition

NMemory is a lightweight non-persistent in-memory relational database engine that is purely written in C# and can be hosted by .NET applications. It supports traditional database features;

  • Indexes
  • Foreign Key Relations
  • Transaction Handling and Isolation
  • Stored Procedures
  • Query Optimization

NMemory library provides a class called Database which represents an in-memory database instance.

Example

public class MyDatabase : Database
{
public MyDatabase()
{
var members = base.Tables.Create<Member, int>(p => p.Id);
var groups = base.Tables.Create<Group, int>(g => g.Id);

var peopleGroupIdIndex = members.CreateIndex(
new RedBlackTreeIndexFactory<Member>(),
p => p.GroupId);

this.Tables.CreateRelation(
groups.PrimaryKeyIndex,
peopleGroupIdIndex,
x => x,
x => x);

this.Members = members;
this.Groups = groups;
}

public ITable<Member> Members { get; private set; }

public ITable<Group> Groups { get; private set; }
}

Learn more

Once the in-memory database is defined, create a database instance and insert some data into the in-memory database.

Example

MyDatabase db = new MyDatabase();

db.Groups.Insert(new Group {
Id = 1,
Name = "Alpha Group" });

db.Groups.Insert(new Group {
Id = 2,
Name = "Beta Group" });

db.Members.Insert(new Member {
Id = 1,
Name = "John Doe",
GroupId = 1,
BirthDay = new DateTime(1966, 4, 12) });

Learn more

Currently, it just serves as the core component of the Effort library. However, developer interest and contribution could make it a more robust engine that might serve well in a wide range of scenarios.

Contribute

The best way to contribute is by spreading the word about the library:

  • Blog it
  • Comment it
  • Fork it
  • Star it
  • Share it
  • A HUGE THANKS for your help.