嵌入式Nosql数据库——LiteDB

LiteDB 是一个开源的 .NET 开发的小型快速轻量级的 NoSQL 嵌入式数据库，特性：

无服务器的 NoSQL 文档存储，数据存储在单一文件中
类似 MongoDb 的简单 API
100% C# 代码，支持 .NET 3.5，单一 DLL，可从 NuGet 安装: Install-Package LiteDB
支持 ACID 事务控制
日志模式下的写失败恢复
可存储 POCO 类或者 BsonDocument
支持文件存储和数据流存储 (like GridFS in MongoDB)
单一数据文件存储，类似 SQLite
文档字段索引，用于快速搜索
支持使用 LINQ 查询
Shell 命令行 (get on - try this online version

自生成id测试

  /// <summary>
        /// 自生成id测试
        /// </summary>
        public void AutoId_Test()
        {
            //打开或者创建新的数据库
            using (var db = new LiteDatabase("sample.db"))
            {
                var cs_int = db.GetCollection<EntityInt>("int");
                // int类型自生成Id
                var cint_1 = new EntityInt { Name = "Using Int 1" };
                var cint_2 = new EntityInt { Name = "Using Int 2" };
                var cint_5 = new EntityInt { Id = 5, Name = "Using Int 5" }; // set Id, do not generate (jump 3 and 4)!
                var cint_6 = new EntityInt { Id = 0, Name = "Using Int 6" }; // for int, 0 is empty
                var cint_7 = new EntityInt { Name = "Using Int 7" };
                cs_int.Insert(cint_1);
                cs_int.Insert(cint_2);
                cs_int.Insert(cint_5);
                cs_int.Insert(cint_6);
                cs_int.Insert(cint_7);
                Console.WriteLine(cint_1.Id);
                Console.WriteLine(cint_2.Id);
                Console.WriteLine(cint_5.Id);
                Console.WriteLine(cint_6.Id);
                Console.WriteLine(cint_7.Id);

                //guid
                var guid = Guid.NewGuid();
                var cguid_1 = new EntityGuid { Id = guid, Name = "Using Guid" };
                var cguid_2 = new EntityGuid { Name = "Using Guid 1" };
                var cguid_3 = new EntityGuid { Name = "Using Guid 2" };
                Console.WriteLine("Guid.NewGuid()="+guid);
                Console.WriteLine(cguid_1.Id);
                Console.WriteLine(cguid_2.Id);
                Console.WriteLine(cguid_3.Id);
                // oid
                var oid = ObjectId.NewObjectId();
                var coid_1 = new EntityOid { Name = "ObjectId-1" };
                var coid_2 = new EntityOid { Id = oid, Name = "ObjectId-2" };
                Console.WriteLine("ObjectId.NewObjectId()=" + oid);
                Console.WriteLine(coid_1.Id);
                Console.WriteLine(coid_2.Id);
                // string 没有自动生成的id
                var cstr_1 = new EntityString { Name = "Object using String" };
                Console.WriteLine(cstr_1.Id);

            }
        }

   /// <summary>
    /// int类型ID
    /// </summary>
    public class EntityInt
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
    /// <summary>
    /// Guyid类型ID
    /// </summary>
    public class EntityGuid
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
    }
    /// <summary>
    /// LiteDB.ObjectId
    /// </summary>
    public class EntityOid
    {
        public ObjectId Id { get; set; }
        public string Name { get; set; }
    }
    /// <summary>
    /// 字符串类型
    /// </summary>
    public class EntityString
    {
        public string Id { get; set; }
        public string Name { get; set; }
    }