guid生成

在C#中GUID生成的四种格式

var uuid = Guid.NewGuid().ToString(); // 9af7f46a-ea52-4aa3-b8c3-9fd484c2af12

            var uuidN = Guid.NewGuid().ToString("N"); // e0a953c3ee6040eaa9fae2b667060e09 

            var uuidD = Guid.NewGuid().ToString("D"); // 9af7f46a-ea52-4aa3-b8c3-9fd484c2af12

            var uuidB = Guid.NewGuid().ToString("B"); // {734fd453-a4f8-4c5d-9c98-3fe2d7079760}

            var uuidP = Guid.NewGuid().ToString("P"); //  (ade24d16-db0f-40af-8794-1e08e2040df3)

            var uuidX = Guid.NewGuid().ToString("X"); // {0x3fa412e3,0x8356,0x428f,{0xaa,0x34,0xb7,0x40,0xda,0xaf,0x45,0x6f}}

SQL中生成GUID

--生成36位的GUID
--2394CDDA-D819-427D-8BFE-107DCD3F949B
select  newid() 
--生成32 位的GUID
--441CC66865204CBC926230640B3B88B0
select replace(newid(), '-', '')