Snowflake 是一个分布式 ID 生成算法,它可以在不依赖数据库的情况下生成全局唯一的 ID。然而,在某些场景下,我们可能需要将 Snowflake 生成的 ID 与数据库结合使用。以下是一个简单的示例,展示了如何在 C# 中使用 Snowflake 生成的 ID 作为数据库表的主键。
Snowflake.Redis
库。通过 NuGet 安装:Install-Package Snowflake.Redis
using System;
using Snowflake.Redis;
public class SnowflakeFactory
{
private readonly IdWorker _idWorker;
public SnowflakeFactory(int workerId, int datacenterId)
{
_idWorker = new IdWorker(workerId, datacenterId);
}
public long GenerateId()
{
return _idWorker.NextId();
}
}
public class User
{
public long Id { get; set; }
public string Name { get; set; }
public string Email { get; set; }
}
using System.Data.SqlClient;
using Dapper;
public class UserRepository
{
private readonly string _connectionString;
private readonly SnowflakeFactory _snowflakeFactory;
public UserRepository(string connectionString, SnowflakeFactory snowflakeFactory)
{
_connectionString = connectionString;
_snowflakeFactory = snowflakeFactory;
}
public void AddUser(User user)
{
using (var connection = new SqlConnection(_connectionString))
{
connection.Open();
// 使用 Snowflake 生成的 ID 作为主键
user.Id = _snowflakeFactory.GenerateId();
const string sql = "INSERT INTO Users (Id, Name, Email) VALUES (@Id, @Name, @Email)";
connection.Execute(sql, user);
}
}
}
public class UserService
{
private readonly UserRepository _userRepository;
private readonly SnowflakeFactory _snowflakeFactory;
public UserService(UserRepository userRepository, SnowflakeFactory snowflakeFactory)
{
_userRepository = userRepository;
_snowflakeFactory = snowflakeFactory;
}
public void AddUser(string name, string email)
{
var user = new User
{
Name = name,
Email = email
};
_userRepository.AddUser(user);
}
}
var connectionString = "your_database_connection_string";
var snowflakeFactory = new SnowflakeFactory(workerId: 1, datacenterId: 1);
var userRepository = new UserRepository(connectionString, snowflakeFactory);
var userService = new UserService(userRepository, snowflakeFactory);
userService.AddUser("John Doe", "john.doe@example.com");
这样,你就可以在 C# 中使用 Snowflake 生成的 ID 作为数据库表的主键了。请注意,这个示例仅用于演示目的,实际项目中可能需要根据你的需求进行调整。