NDB

NDB is an Object Database for .NET written in C# (forked from the NDatabase project @ http://ndatabase.codeplex.com). It functions like a Document/Object Database but is also ACID. The database is quite functional in it's current state but a lot more features are planned for this branch.

Features

• One single database file to store all data:
  • Meta-model
  • Objects
  • Indexes
• Handles cycle detection and circular references
• Safe access from many threads and from many processes
• Store private members (even marked as readonly)
• NoSQL, Linq support and SODA queries
• Values Queries, supporting metrics like Max, Min, Avg, Count and others
• Compatible with LinqPad
• Transactions Support (ACID)
• Store any object, no need for Serializable attribute, OID, or anything else
• Zero Configuration, just reference NDatabase3.dll
• Use as In-Memory Database
• Portability - identify types only by namespace and class name
• Automatic Database Creation
• BTree Indexes
  • Unique indexes
  • Non Unique indexes
• Paging
• Triggers
  • Select trigger (after)
  • Insert trigger (before, after)
  • Delete trigger (before, after)
  • Update trigger (before, after)
• Refactoring
  • Adding a new field (via API)
  • Removing a field (via API)
  • Rename a class (via API)
  • Rename a field (via API)
• Logging mechanism extensible with custom loggers
  • Sample loggers: log4net, Console
• NonPersistent attribute
• CascadeDelete attribute - allowing on cascade delete
• OID attribute - allows on mapping internal OID to class defined field
• Built-in caching
• Sample Northwind database
• Handle Assembly Version Changes
• Dynamic Schema Evolution
• Source Code Available
• Supported Platforms
  • Microsoft .net 3.5, 4.0, 4.5
  • Silverlight 4, Silverlight 5 (see limitations)
  • Windows Phone 7.1, Windows Phone 7.5 (see limitations)
  • Mono (4.0)
• Available on NuGet

NDB Unique Features

• Collection Enumeration (see the types stored in a db)

Planned Features

• Better support for Identity fields
• Full Text Indexing / Searching
• Server Mode
• Replication
  • One Way
  • Merge
• Distributed Transactions
• Better support for migrations
• Sharding
• Map / Reduce Queries
• Compression & Encryption
• Scope Limiting (excluding some related objects when querying for objects)