SQL生成唯一ID号解决方案

新建存自增ID的表：

CREATE TABLE [dbo].[IdentityID](
    [TableName] [varchar](500) NOT NULL,
    [NextID] [bigint] NOT NULL,
 CONSTRAINT [PK_IdentityID] PRIMARY KEY CLUSTERED 
(
    [TableName] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

写一个存储获取当前表的ID:

CREATE PROCEDURE [dbo].[SP_GetIdentityID]
    @TableName varchar(500)
AS
BEGIN
    SET NOCOUNT ON;

    declare @IdentityID bigint
    set @IdentityID=1
    
    begin tran
        update IdentityID
        set @IdentityID=NextID,NextID=NextID+1
        where TableName=@TableName

        if @@rowcount=0
        begin            
            insert into IdentityID(TableName,NextID)
            values(@TableName,@IdentityID+1)
        end
    commit tran
        
    return @IdentityID
END