我正在开发这个应用程序,我需要将大数据文件上传到我的SQL Server数据库,并且我一直在使用FileStream来更有效地执行此操作。
我知道这些文件直接存储在我系统的文件夹中(C:\ CryptoDB)。
问题是,我需要操纵这些文件(解密它们),但我无法恢复它们的文件路径。 这样做,我就可以直接操作它们,而不必通过SQL重新下载它们,这是一种真正的浪费。
到目前为止我能做到的事情:
我的表:
CREATE TABLE [arquivo] (
[idUsuario] INT NOT NULL,
[fileState] INT NOT NULL,
[fileContent] varbinary(max) FILESTREAM,
[fileName] VARCHAR (150) NULL,
[fileSize] VARCHAR (50) NULL,
id UNIQUEIDENTIFIER ROWGUIDCOL NOT NULL UNIQUE,
CONSTRAINT [FK_arquivo_usuario] FOREIGN KEY ([idUsuario]) REFERENCES usuario(id)
);
插入:
Insert into arquivo(id, idUsuario, fileState, fileContent, fileName, fileSize) Values(
newId(),
1,
5,
(SELECT * FROM OPENROWSET(BULK 'c:\medio.jpeg', SINGLE_BLOB) AS varbinary(max)) ,
'medio.jpeg',
'123'
)
当我尝试恢复文件路径时:
DECLARE @filePath varchar(max)
SELECT @filePath = fileContent.PathName()
FROM arquivo
PRINT @filepath
我得到的结果:
\\TEHORT-PC\MSSQLSERVER\v02-A60EC2F8-2B24-11DF-9CC3-AF2E56D89593\CryptoDB\dbo\arquivo\fileContent\31E3697E-0576-4B0F-B0AA-6E046F4116A1\VolumeHint-HarddiskVolume2
文件实际上是:
C:\CryptoDB\DATA\902a7d8d-c8c1-43b0-8c94-b12319293f42\7febdbd1-02c6-4b00-aa3c-a72bee80ef9c\
答案 0 :(得分:1)
获取所有FILESTREAM数据的物理位置的SQL查询(source)
SELECT t.name AS'table', c.name AS'列', fg.name AS'filegroup_name', dbf.type_desc AS'type_description', dbf.physical_name AS'physical_location' FROM sys.filegroups fg INNER JOIN sys.database_files dbf ON fg.data_space_id = dbf.data_space_id INNER JOIN sys.tables t ON fg.data_space_id = t.filestream_data_space_id INNER JOIN sys.columns c ON t.object_id = c.object_id AND c.is_filestream = 1
All FILESTREAM BLOB-fields query result sample
用于获取服务器上FILESTREAM数据的子文件夹的SQL查询: (这些表仅在专用管理员连接(DAC)中使用)。
SELECT o.name AS [Table],cp.name AS [Column],r.rsguid AS [Rowset GUID],rs.colguid AS [Column GUID] FROM SYS.SYSROWSETS r CROSS APPLY sys.sysrscols rs JOIN sys.partitions p ON rs.rsid = p.partition_id JOIN sys.objects o ON o.object_id = p.object_id JOIN sys.syscolpars cp ON cp.colid = rs.rscolid WHERE rs.colguid IS NOT NULL和o.object_id = cp.id AND r.rsguid IS NOT NULL AND r.rowsetid = rs.rsid AND o.name ='DOCUMENT'和cp.name ='DIGITAL_FILE';
2.1。查询结果:
表:文件
列: DIGITAL_FILE
行集GUID: 0x6AA5E6045794D34D8B1FAC0F49A49B0A
列GUID: 0xD756E638FB2CC843AE98F489B57F6D7D
从这个guid计算子路径:
0x6AA5E6045794D34D8B1FAC0F49A49B0A等于此路径: 04e6a56a-9457-4dd3-8b1f-ac0f49a49b0a
[逆转6AA5E604] - [逆转5794] - [逆转D34D] - [逆转8B1F] - [原始AC0F49A49B0A]
0xD756E638FB2CC843AE98F489B57F6D7D等于此路径: 38e656d7-2cfb-43c8-ae98-f489b57f6d7d(previus guid解析中的规则)
2.2结果计算FILESTREAM存储的完整路径:
i:\ SQL Base posc_astrachan FileStreams \ GTMK \ GTM_FILE_STREAM \ 04e6a56a-9457-4dd3-8b1f-ac0f49a49b0a \ 38e656d7-2cfb-43c8-ae98-f489b57f6d7d
3.1。查询高级SQL Server页面信息的存储过程
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[procDBCC_PAGE]
@db_name varchar (500),
@filenum INT,
@pagenum INT
AS
BEGIN
SET NOCOUNT ON
DBCC TRACEON (3604);
DBCC PAGE (@db_name, @filenum, @pagenum, 3) WITH TABLERESULTS;
SET NOCOUNT OFF
END
3.2。用于查询表
的FILESTREAM的BLOB字段的原始文件名的存储过程SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[procFindLogSequenceNumber]
-- @TableName varchar (500),
@instanceS varchar (19), -- key value for filed INSTANCE_S
@tableName varchar(500), -- DOCUMENT
@keyFieldName varchar(500), -- INSTANCE_S
@LogSequenceNumber varchar (500) OUTPUT
AS
SET NOCOUNT ON
DECLARE @db_name varchar (500)
DECLARE @filenum INT
DECLARE @pagenum INT
DECLARE @slotnum INT
DECLARE @rid varchar (100)
DECLARE @ridDotted varchar (100)
DECLARE @parent_object varchar (500)
DECLARE @sql nvarchar(2000)
DECLARE @sqlTable Table(physloc varchar(100))
DECLARE @DBCC_PAGE_Output Table ([ParentObject] varchar (MAX), [Object] varchar (MAX), [Field] varchar (MAX), [VALUE] varchar (MAX))
SET @db_name = db_name()
SET @sql = 'SELECT top 1 sys.fn_PhysLocFormatter (%%physloc%%) AS [PhysicalRID] FROM '+@tableName+' WHERE '
+@keyFieldName+' = '''+@instanceS+''''
INSERT @sqlTable (physloc)
EXECUTE sp_executesql @sql
SET @rid = (select top 1 physloc from @sqlTable)
if @rid is NULL
BEGIN
RETURN -1;
END
-- parse (@rid): (1:1172779:6) 1-@filenum, 2- @pagenum, 3- @slotnum
SET @ridDotted = Replace(@rid, ':', '.');
SET @ridDotted = Replace(@ridDotted, '(', '');
SET @ridDotted = Replace(@ridDotted, ')', '');
SET @filenum = (SELECT Parsename(@ridDotted, 3))
SET @pagenum = (SELECT Parsename(@ridDotted, 2))
SET @slotnum = (SELECT Parsename(@ridDotted, 1))
INSERT @DBCC_PAGE_Output ([ParentObject], [Object], [Field], [VALUE])
EXECUTE procDBCC_PAGE @db_name, @filenum , @pagenum
SET @parent_object = (SELECT TOP 1 [ParentObject] FROM @DBCC_PAGE_Output WHERE [Field] = 'INSTANCE_S'
AND [VALUE] = @instanceS)
--CreateLSN field Only
SET @LogSequenceNumber = (SELECT [VALUE] FROM @DBCC_PAGE_Output WHERE
[ParentObject] = @parent_object AND
[Field] = 'CreateLSN'
)
if @LogSequenceNumber is NULL
BEGIN
RETURN -1;
END
-- result 0006c050:00000120:0090 (442448:288:144)
-- clear (...)
SET @LogSequenceNumber = Replace(@LogSequenceNumber, ' ', '.');
SET @LogSequenceNumber = (SELECT Parsename(@LogSequenceNumber, 2))
--replace ":" to "-"
SET @LogSequenceNumber = Replace(@LogSequenceNumber, ':', '-');
SET NOCOUNT OFF
3.3。对于BLOB的NTFS文件夹中获取文件名的存储过程的示例查询:
declare @filestreamFileName varchar(500);
exec procFindLogSequenceNumber 'ZW_NU9hGZ0CKoSXYAoc', 'DOCUMENT', 'INSTANCE_S', @filestreamFileName OUTPUT
select @filestreamFileName
3.4。结果(NTFS文件夹中的原始文件名):
0003137a-00001244-00d0
3.5。结果完整路径:
i:\ SQL Base posc_astrachan FileStreams \ GTMK \ GTM_FILE_STREAM \ 04e6a56a-9457-4dd3-8b1f-ac0f49a49b0a \ 38e656d7-2cfb-43c8-ae98-f489b57f6d7d \ 0003137a-00001244-00d0
答案 1 :(得分:0)
您获得的路径是正确的,您应该获取网络共享路径而不是本地路径并使用SqlFileStream打开流。
https://msdn.microsoft.com/en-us/library/system.data.sqltypes.sqlfilestream%28v=vs.110%29.aspx
您还可以使用OpenSqlFilestream方法获取文件句柄,即在Windows API中使用它。
答案 2 :(得分:0)
亚历山大的答案很棒,为我节省了很多麻烦,将页面/插槽号码与实际的 LSN 相关联。在我使用SQL Server 2008 R2的情况下,我不得不对他的SP进行一些调整以使其正常工作,那些是:
SPs第一个参数:
@instanceS varchar (100), - 提交的INSTANCE_S的关键值
在我的情况下,这是一个uniqueidentifier,所以我需要一个更大的varchar,原始值是19。
查询DBCC PAGE输出时:
SET @parent_object =(SELECT TOP 1 [ParentObject] FROM @DBCC_PAGE_Output WHERE [Field] = @keyFieldName AND [VALUE] = @instanceS)
它最初声明"[Field] = 'INSTANCE_S'"
显然硬编码了一个适用于OP但不适合我的值。它需要匹配FILESTREAM表的关键字段的名称。
还要澄清 SP输入参数:
@instanceS =标识行的实际列值。将 这总是与列集匹配为表" RowGuid"?
@tableName =很清楚。 FILESTREAM表的名称。
@keyFieldName =表格的键列名称。应该是 来自@instanceS的源列。