SQL Server CheckSum是否计算CRC？如果不是如何让MS SQL在任意varchar列上计算CRC？

分类：MsSQL作者：编程之家用户
SQL Server CheckSum是否计算CRC？如果不是如何让SQL Server在任意的varchar列上计算CRC？

解决方法

对于模型的粗鲁性我很抱歉,但是这似乎是正确的CRC32计算.
我不是一个TSQL专家,我确​​信这可以通过一个真正的SQL Server pro来强大的改进…

@input是计算CRC32的变量.
将其打包为sproc或udf应该是微不足道的,查找表可以被分解为永久表(或甚至是即时计算).

无论如何,它似乎工作.我有兴趣看到任何改进,因为总是很好的学习新的技巧:)

编辑：我已经检查了我的结果与http://crc32-checksum.waraxe.us/,似乎很好,迄今为止.

安德鲁

DECLARE @input VARCHAR(50)
SET @input = 'test'

SET NOCOUNT ON
DECLARE @tblLookup TABLE (ID INT IDENTITY(0,1) NOT NULL,Value BIGINT)
INSERT INTO @tblLookup VALUES (0)
INSERT INTO @tblLookup VALUES (1996959894)
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DECLARE @crc BIGINT,@len INT,@i INT,@index INT
DECLARE @tblval BIGINT
SET @crc = 0xFFFFFFFF
SET @len = LEN(@input)
SET @i = 1

WHILE @i <= @len
BEGIN
    SET @index = ((@crc & 0xff) ^ ASCII(SUBSTRING(@input,@i,1)))  
    SET @tblval = (SELECT Value FROM @tblLookup WHERE ID = @Index)
    SET @crc = (@crc / 256) ^ @tblval   
    SET @i = @i + 1 
END
SET @crc = ~@crc

SELECT @crc as CRC32,CONVERT(VARBINARY(4),@crc) as CRC32Hex

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