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Added comb guid generation for sql server ids.

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This commit is contained in:
Kyle Spearrin 2016-02-06 01:29:35 -05:00
parent 13f85bf2f1
commit c1918f9a32
1 changed files with 34 additions and 1 deletions
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35
src/Core/Repositories/SqlServer/Repository.cs
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@ -10,6 +10,8 @@ namespace Bit.Core.Repositories.SqlServer
{
public abstract class Repository<T, TModel> : IRepository<T> where T : IDataObject where TModel : ITableModel<T>
{
private static readonly long _baseDateTicks = new DateTime(1900, 1, 1).Ticks;
public Repository(string connectionString, string schema = null, string table = null)
{
if(string.IsNullOrWhiteSpace(connectionString))
@ -55,7 +57,7 @@ namespace Bit.Core.Repositories.SqlServer
public virtual async Task CreateAsync(T obj)
{
obj.Id = Guid.NewGuid().ToString();
obj.Id = GenerateComb().ToString();
var tableModel = (TModel)Activator.CreateInstance(typeof(TModel), obj);
using(var connection = new SqlConnection(ConnectionString))
@ -107,5 +109,36 @@ namespace Bit.Core.Repositories.SqlServer
commandType: CommandType.StoredProcedure);
}
}
/// <summary>
/// Generate sequential Guid for Sql Server.
/// ref: https://github.com/nhibernate/nhibernate-core/blob/master/src/NHibernate/Id/GuidCombGenerator.cs
/// </summary>
/// <returns>A comb Guid.</returns>
protected Guid GenerateComb()
{
byte[] guidArray = Guid.NewGuid().ToByteArray();
var now = DateTime.UtcNow;
// Get the days and milliseconds which will be used to build the byte string
var days = new TimeSpan(now.Ticks - _baseDateTicks);
var msecs = now.TimeOfDay;
// Convert to a byte array
// Note that SQL Server is accurate to 1/300th of a millisecond so we divide by 3.333333
var daysArray = BitConverter.GetBytes(days.Days);
var msecsArray = BitConverter.GetBytes((long)(msecs.TotalMilliseconds / 3.333333));
// Reverse the bytes to match SQL Servers ordering
Array.Reverse(daysArray);
Array.Reverse(msecsArray);
// Copy the bytes into the guid
Array.Copy(daysArray, daysArray.Length - 2, guidArray, guidArray.Length - 6, 2);
Array.Copy(msecsArray, msecsArray.Length - 4, guidArray, guidArray.Length - 4, 4);
return new Guid(guidArray);
}
}
}