Programmatically Remove Varbinary Data From Table
Mar 29, 2008
Hey all,
I have a profile table for members of a website that allows them to upload an avatar for use throughout the site. I decided to add the option to just remove the avatar if they want to no longer use one at all and I am stuck.
I am running an update statement against thier entire profile incase they change more then just removing thier avatar but of course when I try this statement.
myCommand.Parameters.AddWithValue("@avatar", "")
I get a conversion error, which makes sence. So what instead of "" do I need for code to just insert empty data to overwirte thier current avatar data.
Any help would be great, thanks for you time.
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Apr 6, 2008
Hey all,
Another varbinary question.
I am trying to move an image stored in a table varbinary(max) directly from one table to another programmatically.
The rest of the data is just nvarchar(50) so I just use a T-SQL select statement in the code behind and feed all of the date into an SqlDataReader, I do this becuse there is some user interaction when the data is moved, so there may be some new values updated when transfering from one table to another, so once the old and possibly new data is stored in seperate variables then I use a T-SQL insert statement to move all of the data into the other table.
Problem is I am not really sure how to handle the image data(varbinary(max)) to just do a straight up transfer from the one table to another. I get conversion errors when trying to handle the data as a string which makes sense.
Not sure what to put for code examples since I really am stumped with this, but here is what is not working.
Dim imageX As String
SqlDataReader Code - imageX = reader("imageData")
Insert code - myCommand.Parameters.AddWithValue("@imageData", imageX)
Thanks in advance,
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Dec 11, 2007
I NEED HELP! Does anyone know how to remove a database schema from SQL Server 2005 using C#? I have a web application that deletes users. In SQL2k, I am able to simply delete the users. In SQL2005, I must delete or alter the schema BEFORE I can delete the users. Of course, the query below works, but how can I get this to work in code for a web application?
USE EAST_USERS
DROP SCHEMA "plijsmith"
Thanks
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Nov 30, 2007
I have a results table that was created from many different sources in SSIS. I have done calculations and created derived columns in it. I am trying to figure out if there is a way to remove duplicate rows from this table without first writing it to a temp sql table and then parsing through it to remove them.
each row has a like key in a column - I would like to remove like rows keeping specific columns in the resulting row based on the data in this key field.
Ideas?
Thanks,
Ad.
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Jun 6, 2008
Hello,
I am trying to create a statement that will update many rows in a table with images, stored as varbinary(max), into a new column.
The path/file information is all stored in another table, but I can't find a way to update more than 1 at a time. Here is the statement that works for 1 row at a time:
update tblphotos set photo = (select
BulkColumn from
Openrowset( Bulk '\**servername**PropsImagesDon Giovanni 2002PropsHorses Guts 2.jpg', Single_Blob) as photo
)
where photoseq = 27
but if I try to do something like this:
CREATE TABLE #temp (
photoSeq int,
photoLoc varchar(255),
photo varbinary(max)
)
INSERT #temp
select p.photoseq, f.fldlocation + p.photophyloc as files,
(select
BulkColumn from
Openrowset( Bulk f.fldlocation + p.photophyloc, Single_Blob) as photo
)
FROM txprops t
join tblfolders f on t.fldlocation = f.fldseq
join tblphotos p on p.photopropseq = t.propseq
begin tran
update a set photo = b.photo
from tblphotos a
join #temp b on a.photoseq = b.photoseq
where a.photoseq = b.photoseq
select * from tblphotos order by photophyloc
commit tran
drop table #temp
I get an error: Incorrect syntax near 'f'.
I think this is because I can only put a path in beside BULK.
I have investigated BULK and bcp commands, but cannot find anything to satisfy this. I tried the DTS package route, but am not getting very far.
Any suggestions? Is DTS the solution for me?
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Apr 11, 2008
Hi,
We serialize a custom object into a byte array (byte[1000]) and store it in a SQL Server 2005 table column as varbinary(1000).
There are a lot of rows retrieved with each SqlDataReader from C# code: up to 3,456,000 rows at a time (that is, roughly 3.5 million rows).
I am trying to figure out what will be more efficent in terms of CPU usage and processing time.
We have come up with quite a few approaches to solve this problem.
In order to try a few of them, I have to know how I can extract certain "pieces" of data from a varbinary value using T-SQL.
For example, out of those 1000 bytes, at any given moment we need only the first 250 bytes and the third 250 bytes.
Total: 1000 -> [250-select][250-no-need][250-select][250-no-need]
One approach would be to get everything and parse it in C#: get the 1st and the 3rd chunks of data and discard the unneeded 2nd and 4th.
This is WAY TOO BAD.
Another approach would be to delegate the "filtering" job to SQL Server so that SqlDataReader gets only what it needs.
I am going to try a SQL-CLR stored procedure, but when I compared performance of T-SQL vs. SQL-CLR stored procs a few weeks ago, I saw that the same job is done by T-SQL a bit faster AND (more importantly for us) with less CPU consumption than SQL-CLR.
So, my question is:
how do I select certain "pieces" of varbinary column data using T-SQL?..
In other words, instead of
SELECT MyVarbinary1000 FROM MyTable
how do I do this:
SELECT <first 250 from MyVarbinary1000>, <third 250 from MyVarbinary1000> FROM MyTable
?
Thank you.
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Jul 19, 2007
I need to store 256 bit hash (SHA-2 alogrithmn) in one of the table'sprimary key. I would prefer to use numeric data type rather varcharetc.* Decimal datatype range is -10^38 +1 to 10^38 -1. I can split my 256bit hash into two decimal(38, 0) type columns as composite key* I can store the hash as varbinary. I never used it and don't havemuch understanding in terms of query writing complexities and dealingit through ADO (data type etc.)It would be heavy OLTP type of systems with hash based primary keyused in joins for data retrieval as well.Please provide your expert comments on this.RegardsAnil
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Aug 18, 2007
I need to put .doc data into a varbinary column for full text searching. I have created the db and columns but am unsure as to how to insert the varbinary data. I have found some discussions about inserting images but nothing explicitly on .doc files. Can anyone suggest resources or sample code?
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Feb 17, 2014
I have a very large database running in a production environment. The backup files are getting to be very difficult to manage. They are at 70gb as of now and growing at a rate of 10gb per month. This is due to document images being stored in the database in one table. I have read a little about a new feature in SQL Server 2012 called Filetable. Can we migrate to SQL Server 2012 and convert to the filetable structure, will this decrease the size of the backups? Would backup of the document images be taken care of by our nightly file system backups now?
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Oct 8, 2007
I have a database that I am using as an archive for emails and am storing them in varbinary(max) data types. The database works fine for inserts and retrieval but I cannot delete large sets of records ( > 30K) without it timing out. I assume this is because SQL server isn't simply releasing the handle to the blob but is instead doing a lot of work reclaiming the space.
Is there any flag I can set or approach I can use to resolve this issue?
I was considering moving the blobs into a seperate simple table and putting async triggers on the primary to delete the blobs, will this work?
Any ideas are appreciated. Besides the "store files in the file system" idea.
- Christopher.
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Sep 11, 2006
I'm unable to create a field with the type varbinary(max). When I try doing this with Management Studio, it tells me that the maximum length is 8000 bytes. I've also tried creating the field with DDL as shown below, but that doesn't work either. If I create the varbinary field with a length of 8000 or less, it works fine. Is there some trick to using varbinary(max)?
Thank you.
create table images (filename nvarchar(250) primary key,photo varbinary(max))
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Nov 4, 2015
Is there a way to encrypt 'varbinary' column data?
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Nov 27, 2006
Greetings once again SSIS friends,
I have some source tables which contain timestamp fields (that's timestamp data type not datetime). My dimension table holds the maximum timestamp value as a varbinary(8).
I want my package to have a variable that holds that value but I don't know which data type to use for this. The reason for this is because I want to use that variable to then retrieve all records from my source table that have a timestamp value greater than the value stored in the variable.
Please advise on what data type is suitable.
Thanks for your help in advance.
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Aug 22, 2006
Could someone help me with writing the code to export the contents of a varbinary field in my database to make the contents be written to the local harddrive? I can do this in Visual Foxpro but my company wants it in C# and I have no clue about C#.
Thank you:eek:
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May 23, 2008
Hi,
I have a SQL script file which creates a table and and inserts all data required by the client app into the table.
The table also holds images in a varbinary field. How do I insert an image held on the file system (e.g. "C:ImagesMyImage.gif") into a varbinary field using a script that is run using sqlcmd on the command line?
Any pointers greatly appreciated!
Mike
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Oct 21, 2014
I have several tables a varbinary column in a database. They have names like CSB_BLOB or OBJECT_BLOB. Now I am having intermittent success with getting the data out.
For example this query returns readable text from this data.
0x46726F6D3A20226465616E6E6167726.....etc --data as stored in the column
SELECT CAST(CSB_BLOB AS VARCHAR(MAX)) AS 'Message' FROM OBJECT_BLOB
However this column has the following query results.
0x0001000000FFFFFFFF01000000000000000C....etc. --data as stored in column
--this query returns empty result
SELECT (CSB_BLOB AS VARCHAR(MAX)) AS 'Message' FROM CSB_STATUS_LOG
--this query returns no change???
SELECT CONVERT(VARCHAR(MAX), CONVERT(VARBINARY(MAX), CSB_BLOB, 2), 2) FROM CSB_STATUS_LOG
0001000000FFFFFFFF01000000000000000C....etc
Obviously there is a difference between the two but I am not educated enough to interpret this difference. What do I need to learn / read so I can look at the data in one of these BLOB columns and know how to convert it to something meaningful?
Something like:
1. Try to cast as varchar to see if it is text.
2. Turn into a byte array and see if it is a jpg
3. Turn into a byte array and see if it is a pdf
4. Convert it to hex and then cast as varchar
5. etc....
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Nov 1, 2007
I have the following table:
CREATE TABLE [dbo].[IntegrationMessages]
(
[MessageId] [int] IDENTITY(1,1) NOT NULL,
[MessagePayload] [varbinary](max) NOT NULL,
)
I call the following insertmessage stored proc from a c# class that reads a file.
ALTER PROCEDURE [dbo].[InsertMessage]
@MessageId int OUTPUT
AS
BEGIN
INSERT INTO [dbo].[IntegrationMessages]
( MessagePayload )
VALUES
( 0x0 )
SELECT @MessageId = @@IDENTITY
END
The c# class then opens a filestream, reads bytes into a byte [] and calls UpdateMessage stored proc in a while loop to chunk the data into the MessagePayload column.
ALTER PROCEDURE [dbo].[UpdateMessage]
@MessageId int
,@MessagePayload varbinary(max)
AS
BEGIN
UPDATE [dbo].[IntegrationMessages]
SET
MessagePayload.WRITE(@MessagePayload, NULL, 0)
WHERE
MessageId = @MessageId
END
My problem is that I am always ending up with a 0x0 value prepended in my data. So far I have not found a way to avoid this issue. I have tried making the MessagePayload column NULLABLE but .WRITE does not work with columns that are NULLABLE.
My column contains the following:
0x0043555354317C...
but it should really contain
0x43555354317C...
My goal is to be able to store an exact copy of the data I read from the file.
Here is my c# code:
public void TestMethod1()
{
int bufferSize = 64;
byte[] inBuffer = new byte[bufferSize];
int bytesRead = 0;
byte[] outBuffer;
DBMessageLogger logger = new DBMessageLogger();
FileStream streamCopy =
new FileStream(@"C:vsProjectsSandboxBTSMessageLoggerInSACustomer3Rows.txt", FileMode.Open);
try
{
while ((bytesRead = streamCopy.Read(inBuffer, 0, bufferSize)) != 0)
{
outBuffer = new byte[bytesRead];
Array.Copy(inBuffer, outBuffer, bytesRead);
string inText = Encoding.UTF8.GetString(outBuffer);
Debug.WriteLine(inText);
//This calls the UpdateMessage stored proc
logger.LogMessageContentToDb(outBuffer);
}
}
catch (Exception ex)
{
// Do not fail the pipeline if we cannot archive
// Just log the failure to the event log
}
}
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Feb 13, 2008
I cannot find the data type for parameter mapping from Execute SQL Task Editor to make this works.
1. Execute SQL Task 1 - select max(columnA) from tableA. ColumnA is varbinary(8); set result to variable which data type is Object.
2. Execute SQL Task 2 - update tableB set columnB = ?
What data type should I use to map the parameter? I tried different data types, none working except GUI but it returned wrong result.
Does SSIS variable support varbinary data type? I know there's a bug issue with bigint data type and there's a work-around. Is it same situation with varbinary?
Thanks,
-Ash
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Jul 3, 2007
ello all
Would someone be so kind as to save me from getting balder through pulling my hair out.
My aim is to extract data from a database using SQLDataSource, then edit the data and update the database using the SQLDataSource.
I have achieve the problem of retrieving the data from the sqlDataSource:DataView openRemindingSeats = (DataView)SqlDataSource2.Select(DataSourceSelectArguments.Empty); //Int32 openRemindingSeats = SqlDataSource2.Select(DataSourceSelectArguments.Empty), DataView;
foreach (DataRowView rowProduct in openReminding) { //Output the name and price lbl_NumOfSeatsLeft.Text = rowProduct["Remaining"].ToString();
}
Within the sqlDataSource the sql code is as follows:SELECT [refNumber], [refRemaining] FROM [refFlights] WHERE ([refNumber] = @Number)
So at the moment my problems is being able to edit and update data to the same SELECTed data.Thank you for any help that you might have...
SynDrome
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Apr 20, 2006
Is there a way to do this? It does not appear as part of the standard SSIS API.
Thanks.
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Apr 2, 2008
I'm creating ssrs reports via the web service render method & would like to be able to determine when a report has no data.
Currently what I'm doing is rendering the report twice - once as a pdf (the format that the report needs to be in) and once as a csv. I then check the csv for a specific string placed in the norows property of the report table.
Is there a better way of doing this? It seems to me that this would have been a good candidate to include in the warnings array.
Between this issue & the hacks required to get data into the header I'm thinking that I should maybe reconsider some other reporting options...
Thanks.
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Jul 20, 2005
Hi,I'm on SQL Server 2000, say, I have a table named [orders], how I findif there is any column which has a formula in it? In other words, howto identify formula column programmatically? I've looked atinformation_schema.columns view for clue but to no avail.Thanks.
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May 19, 2007
I just want to insert a record into a table using a SqlDataSource control. But I'm having a hard time finding examples that don't use data bound controlsI have this so far (I deleted the parts not related to the insert):<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:UserPolls %>" InsertCommand="INSERT INTO [PollAnswers] ([PollId], [AnswerText], [AnswerCount]) VALUES (@PollId, @AnswerText, @AnswerCount)" <InsertParameters> <asp:Parameter Name="PollId" Type="Int32" /> <asp:Parameter Name="AnswerText" Type="String" /> <asp:Parameter Name="AnswerCount" Type="Int32" /> </InsertParameters> </asp:SqlDataSource> This is the data source for a gridview control I have on the page. I could set up an SqlDataSource for this alone if I need to, but i don't know if it would help. From what I could find, in the code behind I should haveSqlDataSource2.Insert()and SqlDataSource2 will grab the parameters and insert the record. The problem is I need to set the Pollid (from a session variable) and AnswerText (from a text box) at run time. Can I do this?Diane
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Nov 3, 2007
Hi
I think I've programmatically created a SqlDataSource - which is what I want to do; but I can't seem to access details from the source - row 1, column 1, for example????
If Not Page.IsPostBack Then
'Start by determining the connection string valueDim connString As New Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)
'Create a SqlConnection instanceUsing connString
'Specify the SQL query
Const sql As String = "SELECT eventID FROM viewEvents WHERE eventID=17"
'Create a SqlCommand instanceDim myCommand As New Data.SqlClient.SqlCommand(sql, connString)
'Get back a DataSetDim myDataSet As New Data.DataSet
'Create a SqlDataAdapter instanceDim myAdapter As New Data.SqlClient.SqlDataAdapter(myCommand)
myAdapter.Fill(myDataSet)Label1.Text = myAdapter.Tables.Rows(0).Item("eventID").ToString() -??????????????
'Close the connection
connString.Close()
End Using
End IfThanks for any helpRichard
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Mar 12, 2008
I have a web application I created in asp.net + sql2005 and am deploying a genercized version of it to multiple clients. I have created a script which dynamically generates a database to a server and creates all of the tables, procs, and views. I now need data from the old database, which will be imported into the new database. It's basically default users, lookup values, etc. What are some methods of getting this data out of the old server and into the new server? I was thinking about generating flat files with the data, then writing code to loop through and insert the data, but it seems very tedious. Do I have any other options? I cannot use Backup and Restore because I have no access to the new sql server's filesystem.Thanks.
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Jan 9, 2007
Hi there,
I have created a package which simply imports data from a flat file to a SQL Server table. But I need to incorporate a data conversion component by which I may change the source-destination column mapping programmatically. So what I thought that I need to add a data conversion component into the dataflow task. After adding this component (I found its component id as {C3BF62C8-7C5C-4F85-83C3-E0B6F6BE267C}) I have created a path which establishes the mapping between output columns of source component and the input columns of data conversion component. Now I am not sure how to establish the mapping between the data conversion component€™s input column collection and output column collection.
I am giving my code snippet here,
IDTSComponentMetaData90 sourceDataFlowComponent = dataFlowTask.ComponentMetaDataCollection.New();
sourceDataFlowComponent.ComponentClassID = "{90C7770B-DE7C-435E-880E-E718C92C0573}";
€¦ €¦ €¦. // Code for configuring the source data flow component
IDTSComponentMetaData90 conversionDataFlowComponent = dataFlowTask.ComponentMetaDataCollection.New();// creating data conversion
conversionDataFlowComponent.ComponentClassID = "{C3BF62C8-7C5C-4F85-83C3-E0B6F6BE267C}";// This is the GUID for data conversion component
CManagedComponentWrapper conversionInstance = conversionDataFlowComponent.Instantiate();//Instantiate
conversionInstance.ProvideComponentProperties();
// Now creating a path to connet the source and conversion
IDTSPath90 fPath = dataFlowTask.PathCollection.New(); fPath.AttachPathAndPropagateNotifications(
sourceDataFlowComponent.OutputCollection[0],
conversionDataFlowComponent.InputCollection[0]);
// Sould I need to accuire connect for data conversion? Im not sure
conversionInstance.AcquireConnections(null);
conversionInstance.ReinitializeMetaData();
// Get the input collection
IDTSInput90 input = conversionDataFlowComponent.InputCollection[0];
IDTSVirtualInput90 vInput = input.GetVirtualInput();
foreach (IDTSVirtualInputColumn90 vColumn in vInput.VirtualInputColumnCollection){
conversionInstance.SetUsageType(
input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READONLY);
}
.. . // Well here I am stucked. What I need to do here to establish a map
// between conversionDataFlowComponent.InputCollection[0] and
// conversionDataFlowComponent.OutputCollection[0]?
As you can see I am just away from creating the mapping between input and output collection. Can anybody give me an idea how can I achieve this?
I will appreciate all kind of suggestions and comments.
Regards
Moim
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Aug 1, 2007
Is it possible to add a Fuzzy Grouping Transformation in a Data flow task by Programmatically ? If it possible, what is the C# or VB .net code for that ?
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May 10, 2006
Hello,
does anyone know of a good example of how to programmatically add a Data Conversion Transformation to a package? I have come so far that I have the component in my dataflow task, but I don't know how to set the properties of it. That is, how to determine the columns that should be converted and to what data type etc.
I (as far as I understand) need a data conversion transformation since I have not managed to create (via the designer) a package that reads data from an AS400 via DB2OLEDB and stores it in a SQL Server 2005 Database. I keep getting the error "string cannot be converted from unicode to non-unicode" (or something like that) and by searching this forum I learned that the data conversion component might do the trick.
I added this conversion to a manually designed package and it solved the error, but I don't know how to re-create this package programmatically. I would really appreciate some help on this.
Also, if someone has managed to import data from AS400 to SQL server 2005 via OLEDB and NOT got the string conversion error, please let me know!
Regards,
Annika
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Feb 26, 2007
Hi There,
I am loading/executing packages from c# and I need to populate a temp table from user input and pass this table as a variable to the datareader source components sql command. I am using expression to build this query, but I am getting design time error when I have this command..
"select id, (SysDate + 28) as ExpiresDate from Table1 where id in (Select Id from" +@[User::Table2]+")"..
I have declared Table2 as a variable of type Object and I am creating Table2 in C# and I am assigning that Table to the user Table. But in the design mode, I am getting an error...expression cannot be evaluated.
Can anybody please tell me when I cannot do this?
Thanks,
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Nov 27, 2007
I am sending a GUID to a form via the query string. If it exists I use helper functions to load most of the form text boxes. However, if it does not then a blank form is presented and the GUID is stored in a hidden field.
Regardless, I use this hidden field to populate a grid that is attached to a sqldatasource.
If I then add new datarows to the backend database programmatically, I cannot 'requery' the datasource to include those row upon a postback. I cannot seem to find a simple way to force the sqldatasource to rerun the query.
Can anyone help.
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Feb 1, 2006
Hello,
I've been working on an application that uploads an RDL to Reporting Services (through the SOAP webservice method CreateReport) programmatically. I'm having difficulty setting up the data source properties for my uploaded report. In particular the Data Source Credentials property.
The datasource for my report doesn't require credentials. By default after I upload the report to Reporting Services, the Data Source Credentials property is set to "Credentials supplied by the user running the report". How do I go about setting the Data Source Credentials property to "Credentials are not required" programmatically through the webservice?
Thanks in advance
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Apr 17, 2007
Hi,
Quick question: how do I determine programmatically if a data driven subscription is currently running?
More info:
I€™m writing a web application which allows the user to kick off an existing data driven subscription (reporting services 2000), which runs from a table with parameters, paths, etc which the user has populated.
The subscription can take several minutes to run, during which time I need to prevent other users from attempting to run the subscription or alter data on the table driving the subscription.
All I€™ve found in the docs so far is
1. The ActiveState on the subscription.
This seems to have more to do with weather or not it can run than if it is running.
2. The status of the subscription.
This seems to only return €śdone: {0} of {1} with {2} errors€? Parsing this is likely to be too flaky to be acceptable.
I really need to move on this as soon as possible, any help is appreciated.
Thanks
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Feb 2, 2007
Dear all,
I am developing tools for automatic creation of data warehouse tables, cubes and SSIS packages. Generating the SSIS Data Flows works very well using the SSIS components for OLE DB Source, Derived Column, Lookup and OLE DB Destination.
However for some of the advanced functionality I need to use Script Component. I have managed to add it in the Data Flow with all inputs and outputs, but how do I populate it with my code? I've seen there is a component property called "SourceCode" and one called "BinaryCode". The "SourceCode" contains the code, but also some extra metadata.
Questions:
Do you know if there is any programmatic support to generate the Source Code property with the metadata necessary?
Do you know how to compile the Source Code and generate the property BinaryCode?
Example from my code below:
// Create script component
IDTSComponentMetaData90 script = dataFlowTask.ComponentMetaDataCollection.New();
script.ComponentClassID = app.PipelineComponentInfos["Script Component"].CreationName;
CManagedComponentWrapper scriptWrapper = script.Instantiate();
script.InputCollection.New();
script.OutputCollection.New();
scriptWrapper.ProvideComponentProperties();
script.Name = "Logics";
// Create path
IDTSPath90 scriptPath = dataFlowTask.PathCollection.New();
scriptPath.AttachPathAndPropagateNotifications(lastComponent.OutputCollection[0], script.InputCollection[0]);
// Populate input and output columns
IDTSInput90 scriptInput = script.InputCollection[0];
IDTSVirtualInput90 scriptVInput = scriptInput.GetVirtualInput();
foreach (IDTSOutputColumn90 col in oledbSrc.OutputCollection[0].OutputColumnCollection)
{
scriptWrapper.SetUsageType(scriptInput.ID, scriptVInput, col.LineageID, DTSUsageType.UT_READONLY);
IDTSOutputColumn90 tmp = script.OutputCollection[0].OutputColumnCollection.New();
tmp.Name = col.Name;
tmp.SetDataTypeProperties(col.DataType, col.Length, col.Precision, col.Scale, col.CodePage);
}
// Make script asynchronous
script.OutputCollection[0].SynchronousInputID = 0;
Thanks for any assistance and Best Regards,
Johan Åhlén,
Business Intelligence consultant at IFS
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