［SQL］(Stored Procedure)获取当前日期（一）

设置服务器恒定时间，且获取当前服务器的时间。
[SQL Server]如果直接利用GETDATE()获取服务器当前时间，所获取的时间为server所在的本地的时间，这样如果数据中心在其他地域国家，或者不同server同步数据，直接利用GETDATE()便会出现问题。解决方案，在数据库创建一个存储当前business date的表：SysCurrentDate，之后在从该table中获取被设定好的当前Server date

(1)： 存储business date的拟创表语句

CREATE TABLE [dbo].[SysCurrentDate]([ID] [int] IDENTITY(1,1) NOT NULL,[CurrentDate] [datetime] NOT NULL,[CurrentTime] [datetime] NULL,[CreatedBy] [nvarchar](30) NOT NULL,[CreatedDate] [datetime] NOT NULL,[UpdatedBy] [nvarchar](30) NULL,[UpdatedDate] [datetime] NULL, CONSTRAINT [PK_SysCurrentDate] PRIMARY KEY CLUSTERED ([ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

(2)： 利用stored procedure获取该当前业务日期（注：如果该表中有数据则返回该当前date，如果没有数据则直接返回DB Server所在的当地date）
拟create sp语句：

-- =====================================================================================-- Author: bluetata-- ALTER date: 13-Oct-2017-- Description:-- Get the current date from the table SysCurrentDate-- If no item in the table, return GETDATE()-- else--if CurrentTime is not null--return static date and time from current date--else--return static date from CurrentDate and running time from GETDATE()-- =====================================================================================CREATE PROCEDURE [dbo].[sys_sp_GetCurrentDate] ASBEGINDECLARE @CurrentDate datetime = NULLDECLARE @CurrentTime datetime = NULLDECLARE @ReturnDate datetime = NULLSELECT TOP 1 @CurrentDate = CurrentDate, @CurrentTime = CurrentTime FROM SysCurrentDateIF(@CurrentDate IS NOT NULL)BEGINIF(@CurrentTime IS NULL)BEGINSET @ReturnDate = CONVERT(varchar(20),CONVERT(date, @CurrentDate)) + ' ' + convert(varchar(10), GETDATE(), 108)ENDELSEBEGINSET @ReturnDate = CONVERT(varchar(20),CONVERT(date, @CurrentDate)) + ' ' + convert(varchar(10), @CurrentTime, 108)ENDENDELSEBEGINSET @ReturnDate = GETDATE()ENDSELECT @ReturnDate AS CurrentDateEND

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