SQL Server:BINARY_CHECKSUM为相同的值

时间:2015-11-01 01:57:18

标签: sql-server sql-server-2008

我在SQL Server的BINARY_CHECKSUM函数上遇到了一个奇怪的问题。下面的代码(只是在管理工作室上复制和查询)在不同的机器上为不同版本的SQL Server返回不同的校验和值(我不确定是否因为版本差异或服务器差异而发生这种情况)。

注意:

  • 该值实际上是一个二进制文件,存储在SQL Server中。但这不是我认为的重点,价值就在那里

  • 查询返回服务器1上的1475829670值(使用SQL Server 2005)

  • 它在服务器2上返回1024353818的值(使用SQL Server 2008)

  • 它在服务器3(使用SQL Server 2012)上返回1024353818的值

查询是:

select 
    BINARY_CHECKSUM(0x4D5A90000300000004000000FFFF0000B800000000000000400000000000000000000000000000000000000000000000000000000000000000000000800000000E1FBA0E00B409CD21B8014CCD21546869732070726F6772616D2063616E6E6F742062652072756E20696E20444F53206D6F64652E0D0D0A2400000000000000504500004C010300F53DEF550000000000000000E00002210B0108000028000000060000000000005E46000000200000006000000000400000200000000200000400000000000000040000000000000000A0000000020000000000000300408500001000001000000000100000100000000000001000000000000000000000000C4600004F00000000600000C002000000000000000000000000000000000000008000000C00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000080000000000000000000000082000004800000000000000000000002E7465787400000064260000002000000028000000020000000000000000000000000000200000602E72737263000000C00200000060000000040000002A0000000000000000000000000000400000402E72656C6F6300000C0000000080000000020000002E0000000000000000000000000000400000420000000000000000000000000000000040460000000000004800000002000500082D00000419000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001E02280300000A2A4E027C010000047B0400000A6F0500000A26172A2602037D01000004172A000003300500BD00000000000000027C010000047C0600000A7B0700000A720100007016720900007072090000706F0800000A26027C010000047C0600000A7B0900000A7201000070166F0A00000A26027C010000047C0600000A7B0B00000A7201000070176F0C00000A26027C010000047C0600000A7B0700000A720B00007016720900007072090000706F0800000A26027C010000047C0600000A7B0900000A720B000070166F0A00000A26027C010000047C0600000A7B0B00000A720B000070176F0C00000A262A000000133005000A010000010000111200FE15040000011200177D0D00000A0F017B0E00000A1F0A331412000228070000068C0F0000017D0F00000A062A0F017B0E00000A20C900000033261200020F017B1000000A169A74100000010F017B1000000A179A28080000067D0F00000A062A0F017B0E00000A1F7A3316020F017B1000000A169AA5110000012809000006062A0F017B0E00000A1F6533221200020F017B1000000A169AA511000001280A0000068C0F0000017D0F00000A062A0F017B0E00000A1F7C330802280B000006062A0F017B0E00000A1F793316020F017B1000000A169AA511000001280C000006062A0F017B0E00000A1F0F3308022804000006062A1200167D0D00000A1200147D0F00000A062ADA031F0A3302172A0320C90000003302172A031F7A3302172A031F653302172A031F7C3302172A031F793302172A031F0F3302172A162A000000133005006104000002000011027C010000047C1100000A7B1200000A72170000706F1300000A027C010000047C1100000A7B1400000A722B0000706F1500000A72550000700A067284010070281600000A0A067202020070281600000A0A06727C020070281600000A0A0672EA020070281600000A0A067279030070281600000A0A0672F7030070281600000A0A027C010000047C1100000A7B1700000A066F1800000A027C010000047C1100000A7B1900000A720B0000706F1A00000A027C010000047C0600000A7B0700000A7210050070167209000070146F0800000A26027C010000047C0600000A7B0700000A722A050070167209000070146F0800000A26027C010000047C0600000A7B0700000A723A0500701F0C723A050070146F0800000A26027C010000047C0600000A7B1B00000A723A050070166F1C00000A26027C010000047C0600000A7B0700000A7244050070167244050070146F0800000A26027C010000047C0600000A7B0700000A7260050070167260050070146F0800000A26027C010000047C0600000A7B0700000A727E05007016727E050070146F0800000A26027C010000047C0600000A7B0700000A72A20500701672A2050070146F0800000A26027C010000047C0600000A7B0700000A72C00500701672C0050070146F0800000A26027C010000047C0600000A7B0700000A72E20500701F0A72E2050070146F0800000A26027C010000047C0600000A7C1D00000A7B1E00000A72E20500707202060070721A0600706F1F00000A26027C010000047C0600000A7C1D00000A7B1E00000A72E20500707234060070724E0600706F1F00000A26027C010000047C0600000A7B0700000A726A0600701F0A726A060070728C0600706F0800000A26027C010000047C0600000A7C1D00000A7B1E00000A726A060070728C06007072940600706F1F00000A26027C010000047C0600000A7C1D00000A7B1E00000A726A06007072B406007072BE0600706F1F00000A26027C010000047C0600000A7B0700000A72D80600701772D806007072090000706F0800000A26027C010000047C0600000A7B0700000A72F60600701972F6060070168C0F0000016F0800000A26027C010000047C0600000A7B0700000A721C07007019721C070070178C0F0000016F0800000A26027C010000047C0600000A7B0700000A72480700701B7248070070146F0800000A26027C010000047C0600000A7B0700000A72720700701F0F7272070070168C0F0000016F0800000A26027C010000047C0600000A7B0700000A72A00700701F0F72A0070070168C0F0000016F0800000A26027C010000047C0600000A7B0900000A7248070070166F0A00000A26027C010000047C0600000A7C2000000A7B2100000A72A007007072D60700706F2200000A26027C010000047C0600000A7C2000000A7B2100000A727207007072140800706F2200000A26027C010000047C1100000A7B2300000A166F2400000A027C010000047C1100000A7B2500000A166F2600000A027C010000047C1100000A7B2700000A166F2800000A172A000000033003000D020000000000000372F6060070282900000A39AC010000027C010000047C0600000A7B2A00000A72F60600706F2B00000A3AC9000000027C010000047C0600000A7B0900000A726A060070166F0A00000A26027C010000047C0600000A7B0900000A72D8060070166F0A00000A26027C010000047C0600000A7B0900000A72E2050070166F0A00000A26027C010000047C0600000A7B0900000A7244050070166F0A00000A26027C010000047C0600000A7B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我被困在这里好几个小时。谢谢你的帮助。

1 个答案:

答案 0 :(得分:0)

对于字节更改验证,您应该使用HASHBYTES,其中包含用于生成其哈希值的算法的已发布列表。

BINARY_CHECKSUM,就像CHECKSUM容易丢失更改一样,不会用于此目的。来自CHECKSUM文章的备注部分。

  

但是,校验和不会改变的可能性很小。出于这个原因,我们不建议使用CHECKSUM来检测值是否已更改,除非您的应用程序可以容忍偶尔错过更改。请考虑使用HashBytes。当指定MD5哈希算法时,HashBytes为两个不同输入返回相同结果的概率远低于CHECKSUM。

正如弗拉基米尔·巴拉诺夫的评论指出的那样,这种行为可能在SQL 2005之后发生了变化,但无论如何,任何CHECKSUM方法的目的都是用于“哈希索引”,因此唯一性永远不会得到保证......从来没有保证任何哈希算法,每个只尝试提高你不会找到两个具有相同哈希值的不同值的概率。