Question

我正在尝试为SQL Server 2008中的整个表计算校验和或散列。我遇到的问题是该表包含XML列数据类型，不能由校验和使用，必须是首先转换为nvarchar。所以我需要将其分解为两个问题：

计算行的校验和，架构在运行时之前是未知的。
计算所有行的校验和以获得全表校验和。

Answer 1

您可以使用CHECKSUM_AGG。它只需要一个参数，因此您可以执行CHECKSUM_AGG(CHECKSUM(*)) - 但这不适用于您的XML数据类型，因此您将不得不求助于动态SQL。

您可以从INFORMATION_SCHEMA.COLUMNS动态生成列列表，然后将int插入模板中：

SELECT @column_list = COALESCE(@column_list + ', ', '')
        + /* Put your casting here from XML, text, etc columns */ QUOTENAME(COLUMN_NAME)
FROM    INFORMATION_SCHEMA.COLUMNS
WHERE   TABLE_NAME = @table_name
    AND TABLE_SCHEMA = @schema_name

DECLARE @template AS varchar(MAX)
SET @template = 'SELECT CHECKSUM_AGG(CHECKSUM({@column_list})) FROM {@schema_name}.{@table_name}'

DECLARE @sql AS varchar(MAX)
SET @sql = REPLACE(REPLACE(REPLACE(
    '{@column_list}', @column_list),
    '{@schema_name}', @schema_name),
    '{@table_name}', @table_name)

EXEC ( @sql )

Answer 2

我修改了脚本，为数据库中的所有相关表生成查询。

USE myDatabase
GO
DECLARE @table_name sysname
DECLARE @schema_name sysname
SET @schema_name = 'dbo'

DECLARE myCursor cursor
FOR SELECT TABLE_NAME
      FROM INFORMATION_SCHEMA.TABLES T
     WHERE T.TABLE_SCHEMA = @schema_name
       AND T.TABLE_TYPE = 'BASE TABLE'
       AND T.TABLE_NAME NOT LIKE 'MSmerge%'
       AND T.TABLE_NAME NOT LIKE 'sysmerge%'
       AND T.TABLE_NAME NOT LIKE 'tmp%'
     ORDER BY T.TABLE_NAME

OPEN myCursor

FETCH NEXT 
FROM myCursor
INTO @table_name 

WHILE @@FETCH_STATUS = 0
BEGIN
    DECLARE @column_list nvarchar(MAX)
    SET @column_list=''
SELECT @column_list = @column_list + CASE WHEN DATA_TYPE IN ('xml','text','ntext','image sql_variant') THEN 'CONVERT(nvarchar(MAX),'
                                          ELSE ''
                                     END
                                   + QUOTENAME(COLUMN_NAME)
                                   + CASE WHEN DATA_TYPE IN ('xml','text','ntext','image sql_variant') THEN ' /* ' + DATA_TYPE + ' */)'
                                          ELSE ''
                                     END + ', '
  FROM INFORMATION_SCHEMA.COLUMNS
     WHERE TABLE_NAME = @Table_name
     ORDER BY ORDINAL_POSITION

    SET @column_list = LEFT(@column_list, LEN(@column_list)-1) -- remove trailing comma

    DECLARE @sql AS nvarchar(MAX)
    SET @sql = 'SELECT ''' + QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name) + ''' table_name,
       CHECKSUM_AGG(CHECKSUM(' + @column_list + ')) CHECKSUM
  FROM ' + QUOTENAME(@schema_name) + '.' + QUOTENAME(@Table_name) + ' WITH (NOLOCK)'


    PRINT  @sql

    FETCH NEXT 
    FROM myCursor
    INTO @table_name 

    IF @@FETCH_STATUS = 0
        PRINT  'UNION ALL'

END

CLOSE myCursor
DEALLOCATE myCursor
GO

Answer 3

// SQL和C＃镜像乌克兰的快速哈希值 // HASH_ZKCRC64 /// ----------------------------------------------- -------------------------------------------------- ------------- private Int64 HASH_ZKCRC64（byte [] Data） { Int64结果= 0x5555555555555555; if（Data == null || Data.Length＆lt; = 0）返回0; int SizeGlobalBufer = 8000; int Ost = Data.Length％SizeGlobalBufer; int LeftLimit =（Data.Length / SizeGlobalBufer）* SizeGlobalBufer;

        for (int i = 0; i < LeftLimit; i += 64)
        {
            Result = Result
            ^ BitConverter.ToInt64(Data, i)
            ^ BitConverter.ToInt64(Data, i + 8)
            ^ BitConverter.ToInt64(Data, i + 16)
            ^ BitConverter.ToInt64(Data, i + 24)
            ^ BitConverter.ToInt64(Data, i + 32)
            ^ BitConverter.ToInt64(Data, i + 40)
            ^ BitConverter.ToInt64(Data, i + 48)
            ^ BitConverter.ToInt64(Data, i + 56);
             if ((Result & 0x0000000000000080) != 0)
             Result = Result ^ BitConverter.ToInt64(Data, i + 28); 
        }

        if (Ost > 0)
        {
           byte[] Bufer = new byte[SizeGlobalBufer];
           Array.Copy(Data, LeftLimit, Bufer, 0, Ost);
           for (int i = 0; i < SizeGlobalBufer; i += 64)
           {
               Result = Result
               ^ BitConverter.ToInt64(Bufer, i)
               ^ BitConverter.ToInt64(Bufer, i + 8)
               ^ BitConverter.ToInt64(Bufer, i + 16)
               ^ BitConverter.ToInt64(Bufer, i + 24)
               ^ BitConverter.ToInt64(Bufer, i + 32)
               ^ BitConverter.ToInt64(Bufer, i + 40)
               ^ BitConverter.ToInt64(Bufer, i + 48)
               ^ BitConverter.ToInt64(Bufer, i + 56);
               if ((Result & 0x0000000000000080)!=0)
               Result = Result ^ BitConverter.ToInt64(Bufer, i + 28); 
           }
        }

        byte[] MiniBufer = BitConverter.GetBytes(Result);
        Array.Reverse(MiniBufer);
        return BitConverter.ToInt64(MiniBufer, 0);

        #region SQL_FUNCTION
        /*  CREATE FUNCTION [dbo].[HASH_ZKCRC64] (@data as varbinary(MAX)) Returns bigint
            AS
            BEGIN
            Declare @I64 as bigint Set @I64=0x5555555555555555
            Declare @Bufer as binary(8000)
            Declare @i as int Set @i=1
            Declare @j as int 
            Declare @Len as int Set @Len=Len(@data)     

            if ((@data is null) Or (@Len<=0)) Return 0

              While @i<=@Len
              Begin
               Set @Bufer=Substring(@data,@i,8000)
               Set @j=1
                   While @j<=8000
                   Begin
                    Set @I64=@I64 
                    ^ CAST(Substring(@Bufer,@j,   8) as bigint) 
                    ^ CAST(Substring(@Bufer,@j+8, 8) as bigint) 
                    ^ CAST(Substring(@Bufer,@j+16,8) as bigint)
                    ^ CAST(Substring(@Bufer,@j+24,8) as bigint)
                    ^ CAST(Substring(@Bufer,@j+32,8) as bigint)
                    ^ CAST(Substring(@Bufer,@j+40,8) as bigint)
                    ^ CAST(Substring(@Bufer,@j+48,8) as bigint)
                    ^ CAST(Substring(@Bufer,@j+56,8) as bigint)
                    if @I64<0 Set @I64=@I64 ^ CAST(Substring(@Bufer,@j+28,8) as bigint)      
                    Set @j=@j+64    
                   End;  
               Set @i=@i+8000
              End
            Return @I64
            END
         */
        #endregion

   }

计算SQL Server中的表的哈希或校验和

3 个答案: