- #BLOB FIELD WITH COMPRESSION DATA IS NOT VALID PDF#
- #BLOB FIELD WITH COMPRESSION DATA IS NOT VALID CODE#
- #BLOB FIELD WITH COMPRESSION DATA IS NOT VALID SERIES#
# Export of "larger" Sql Server Blob to file Listing 8: Saving the BLOB data to a file via PowerShell You will need to change the entry for $Database to the instance for your environment. It loops through the source table to extract all BLOB fields, using the ‘PictureName’ column to dictate the resultant filename. This example has been taken from a Technet article, with minor editing for the instance, file location and suchlike. SELECT = 'C:\BLOBTest\BLOBOut\WC.jpg'ĮXEC sp_OACreate 'ADODB.Stream', OUTPUT - Create ObjectĮXEC sp_OAMethod 'Write', NULL, sp_OAMethod 'SaveToFile', NULL, 2 Listing 7: Saving the BLOB data to a file via OLE processes Check that the output location is empty, so you are sure that it has completed successfully.
#BLOB FIELD WITH COMPRESSION DATA IS NOT VALID SERIES#
The example below saves the BLOB data to a specified file location and name by using a series of OLE objects. Sp_configure 'Ole Automation Procedures', 1 Listing 6: Reconfigure to allow Ole Automation Procedures As with the activation of xp_cmdshell, this is an instance-wide command.
#BLOB FIELD WITH COMPRESSION DATA IS NOT VALID CODE#
If Ole Automation Procedures is not enabled and it is permitted to change this, then the code below will activate it. For more information about enabling ‘Ole Automation Procedures’, search for ‘Ole Automation Procedures’ in SQL Server Books Online. A system administrator can enable the use of ‘Ole Automation Procedures’ by using sp_configure. SQL Server blocked access to procedure ‘sys.sp_OACreate’ of component ‘Ole Automation Procedures’ because this component is turned off as part of the security configuration for this server. Msg 15281, Level 16, State 1, Procedure sp_OACreate, Line 1 If this completes without any errors, execute the code in Listing 2 again and a file will be created in the target folder.īCP via CMD Window Results OLE object creation via SSMSĪs with using xp_cmdshell, this example requires that sp_configure is used to allow ‘Ole Automation Procedures’, otherwise a error message similair to the following will be raised: To enable xp_cmdshell, the easiest method is to execute sp_configure, which changes the settings for the entire instance, not just the database that we’re using.ĮXEC sp_configure 'Show Advanced Options',1 For more information about enabling ‘xp_cmdshell’, search for ‘xp_cmdshell’ in SQL Server Books Online. A system administrator can enable the use of ‘xp_cmdshell’ by using sp_configure. SQL Server blocked access to procedure ‘sys.xp_cmdshell’ of component ‘xp_cmdshell’ because this component is turned off as part of the security configuration for this server. SET 'BCP "SELECT PictureData FROM BLOB_ " QUERYOUT C:\BLOBTest\BlobOut\WC.jpg -T -f "C:\BLOBTest\FormatFile\BLOB.fmt" -S ' + _cmdshell xp_cmdshell is not permitted, you will receive the message:
Listing 3: Saving the image data to a file The SQL code to save the image data from SQL Server, to a file is: This example has a format file supplied (‘BLOB.fmt’). Not all sites allow this, so this option might not be permitted.Įxporting via BCP can be problematic and is improved by using a ‘format file’. Using this within SSMS requires the use of xp_cmdshell, which in turn requires that xp_cmdshell is permitted within SQL Server. The Bulk Copy Program (BCP) utility can be used to copy data between SQL Server and data files. Saved jpg BCP via SQL Server Management Studio (SSMS)
The result of this is a binary column containing the image data.
OPENROWSET(BULK 'C:\BLOBTest\BLOBIn\Oops.jpg', SINGLE_BLOB) An additional column has a suggested name for the image file, which will be used later, within the PowerShell example. In this example, I’m saving a jpg by using OPENROWSET to save the SINGLE_BLOB. Listing 1: SQL code to create database and table The first step is to create a test database, with a table that has a varbinary(max) column within it. The code used in this article can be downloaded from here. BCP via SQL Server Management Studio (SSMS).Detailįor this example, I’m going to save a jpg image into a database and then extract it in a variety of ways: There are various arguments for and against storing such items within a database but I’m not going to concern myself with that in this article I just want to learn how it can be done. I have never needed to save BLOB data within a SQL Server database.
#BLOB FIELD WITH COMPRESSION DATA IS NOT VALID PDF#
Binary Large Objects (BLOB) data can be a graphical image, a pdf document, a music file or any of a wide range of data types, which can generally be saved into a SQL Server database.Īs part of a series of investigations I’m currently performing within SQL Server, I have looked at how BLOB data can be saved and retrieved.
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