From c87f444a6095db851243a027bc436e5a378ef9a7 Mon Sep 17 00:00:00 2001
From: yitter <yitter@126.com>
Date: Sat, 17 Apr 2021 23:33:30 +0800
Subject: [PATCH] auto commit

---
 SQL/README.md     |  9 +++++++++
 SQL/sqlserver.sql | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 SQL/README.md
 create mode 100644 SQL/sqlserver.sql

diff --git a/SQL/README.md b/SQL/README.md
new file mode 100644
index 0000000..3556b1a
--- /dev/null
+++ b/SQL/README.md
@@ -0,0 +1,9 @@
+#  ❄ idgenerator-SQL
+
+## 介绍
+
+这里是在不同数据库中生成雪花ID的脚本。
+
+
+
+
diff --git a/SQL/sqlserver.sql b/SQL/sqlserver.sql
new file mode 100644
index 0000000..a35d3a1
--- /dev/null
+++ b/SQL/sqlserver.sql
@@ -0,0 +1,46 @@
+/*
+���˵����
+
+1.����SQL Server��һ�����÷��������д˽ű��󣬽���SQL Server�ġ��ɱ����-����-����ֵ������������һ������ Fn_NextSnowId
+
+2.���ɵ�ID = ʱ��� + WokerId + �����
+	ʱ��� = ��ǰʱ��������뵥λ�� - 1582136402000
+	WorkerId = {����ֵ}
+	����� = 5 �� 2^SeqBigLength-1 ֮�������
+
+3.���÷�����
+	���磺select dbo.Fn_NextSnowId(rand())
+
+*/
+CREATE function dbo.Fn_NextSnowId
+(
+	@RandomSeed float -- ����ID�ĺ�������Ҫ��һ����������ڵ���ʱ������ϵͳ���� rand() ����
+)
+returns bigint
+as
+begin
+	declare @CurrentTime bigint
+	declare @TimeTick bigint
+	declare @WorkerId int
+	declare @WorkerIdBigLength int
+	declare @SeqBigLength int
+
+	-- Begin: ��������Ҫ��ʼ���IJ�������ȷ�� @WorkerIdBigLength �� @SeqBigLength ������ֵ������Ӧ�ó�����ͬ
+	set @WorkerId = 1 -- ���ֵ 2^@WorkerIdBigLength-1
+	set @WorkerIdBigLength = 4 -- @WorkerIdBigLength+@SeqBigLength����Ҫ����22
+	set @SeqBigLength = 8
+	-- End
+
+	-- ��ǰʱ��������뵥λ��
+	set @CurrentTime = CONVERT(BIGINT,DATEDIFF(MI,'1970-01-01 00:00:00.000', GETUTCDATE())) * 60000 + DATEPART(S,GETUTCDATE()) * 1000 + DATEPART(MS, GETUTCDATE())
+
+	-- �õ�ǰʱ�����ȥ����ʱ�䣬�ó�ID��ʱ����
+	set @TimeTick=@CurrentTime-1582136402000 
+
+	-- ����ID
+	-- ѩ��ID�������� = 5��2^SeqBigLength-1֮���������� (5 + round((POWER(2, @SeqBigLength)-1) * rand(), 0)
+	return @TimeTick * POWER(2, @WorkerIdBigLength + @SeqBigLength) + @WorkerId * POWER(2, @SeqBigLength) + (5 + round((POWER(2, @SeqBigLength)-1) * @RandomSeed, 0))
+end
+GO
+
+