Visual Studio 2010 Sql Server – A few months ago I ran into an interesting problem on a client site. Those of you who have read my previous article titled “Excel when loading multiple workbooks in SQL Server” know how difficult it is to load data from multiple spreadsheets into our financial database.
Now, one of the business rules of the enterprises was that the loading of this data should not occur before the last spreadsheet of the day arrived in the shared data repository.
Visual Studio 2010 Sql Server
Imagine that a client has offices in California, Boston, London, Munich, Sydney and Hong Kong. Since this is a 24/7 global organization, it’s not surprising that the data files will arrive at different times. We will now look at an innovative way to accomplish this download task using Visual Studio as the interface.
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The Visual Studio project we are about to create will run continuously once completed and activated. It never stops. The overhead of this continuous run is minimal as it is idle most of the time and only wakes up when new files arrive. The appearance of a dummy file named “finish.txt” is a signal to start actual data processing.
Resizing the “form” is not required because we won’t be adding any visible controls or visuals to the form.
“TargetDir” is used to specify where to find new Excel data spreadsheets. Again, the data contained in these spreadsheets is uploaded daily to our financial database.
Our next task is to create the necessary code that will be executed during the “form” load event (see below).
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Note that we have a source directory “hard-wired” to where the Excel spreadsheets are to be found by our upload process. While not the best coding method, I wanted to describe what each line of code achieves in the simplest possible way.
We then tell our instance “FileSystemWatcher” to basically tell our “decision” to keep track of all files in the given “TargetDir” directory.
Next, set the NotifyFilter property (see above). This tells the FileSystemWatcher what type of element(s) it will re-report. In our case, this will be the name of the file(s). Finally, we are looking for a dummy “txt” file to be pasted into the working spreadsheet’s Windows directory to indicate that the SSIS upload should be completed now that all required data is present.
The last step inside our load event is to parse the names of the files currently in our target directory. The “ParseExistingFiles” subroutine is called (see code directly below). As we remember, “TargetDir” was initialized above.
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First, we create an instance of “Directory” of the “DirectoryInfo” object. FileDetails is set to an array instance containing the names of all files in the given directory (see above).
The code below is used for the files currently in the directory. In our case, spreadsheets and any other files that may be in the directory.
We are now looping through the filenames in the array one name at a time inside “FileDetails” and each name one at a time “Are you the filename I need to start SSIS’ daily batch upload?” passed to the subroutine. This routine is called “ParseIndividualFile”:
With “existing filename”, we now check the details of the file to see if it is the “destination file”, and if it is, we can start downloading the SSIS package.
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Now that the name of the current file has been entered into this routine, we need to check its name to make sure that
This is “finish.txt”. If so, then the next statement is executed IF END ELSE We continue the loop.
Once the trigger file arrives, it will be called “finish.txt” and therefore will be able to enter the IF/END loop. The loop runs a system process, and we pass as a parameter the name of an executable Windows DOS batch file (Go.bat). We will discuss the contents of this batch file in the section below.
Now!! , there must be only one trigger file. Once the file is found, we can code out of the loop, since further processing would be meaningless. This exercise is left to the reader.
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So far, we have not been able to execute new incoming files. In other words, the code we have created (so far) corresponds to the files that were in the directory before the VB application was launched or next run. Most likely, we will start the VB application and wait for the files to arrive.
However, we now add another routine that “reacts” to the “fired event” of the “file system watcher”. After all, the file is actually “created” when it is submitted to the directory. This includes new spreadsheets, etc.
The “ParseIndividualFile” subroutine is called again to “see” if this file is a trigger.
The content of the finish.txt file can be any text you want to put in the file. The text is a space filler and is not associated with any processing (see below):
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Because my version of Office 2013 is 32-bit, I have to use the 32-bit version of dtexec.exe located in the SQL Server subdirectories under the “Program Files (x86)” directory. Note that if you try this with a 64-bit version of dtexec.exe (and your version of Office is 32-bit), you will get a runtime error (see appendix below).
After the package is complete, we copy the spreadsheets from the working directory to the backup directory for further processing (however, this is beyond the scope of the current discussion).
A few weeks ago, we looked at how to load data from Excel spreadsheets into our SQL Server database using SQL Server Data Tools. At the end of the article, I mentioned that we can automate downloads. If we knew with certainty that all the data would be in the working directory at a given time, we could easily trigger the download via SQL Server Agent.
In reality, 24/7 businesses with offices around the world have different “time-in-times” for their data files, and most of these firms only want to process when all the data has been received.
Visual Studio 2010 Release Date Is April 12, 2010
Steve Simon is a SQL Server MVP and Senior BI Development Engineer at Atrion Networking. He has been designing and analyzing databases for over 29 years.
Steve has been a speaker at 8 PASS Summits and PASS Europe in 2009 and 2010. He recently presented Master Data Services at the PASS Amsterdam Rally.
© 2023 Quest Software Inc. All rights reserved. | GDPR | Terms of use | Privacy1) Create a new project (File->New Project->Visual C# (or Visual Basic) ->Windows Forms Application) or open a previously created .NET project.
If you choose the DataSet option, you must create a BindingSource object and a DataSet object to access the database in your program. In terms of performance DataSet is better than Entity DataModel.
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If you choose the entity data model, tables and records are displayed as classes and objects, and you can easily manipulate them. From a rapid development point of view, an entity data model is better than a dataset.
4) Select New connection in the new window. You will be presented with several options for setting up a connection to your database.
5) Click the Change button. You will now be presented with a choice of several database types (Access, Oracle, SQL Server, etc.). To use a local SQL Server, select the SQL Server Compact 3.5 option.
6) Now you will see that the layout of your window has changed a bit. Now you can create a new database or specify the location of an already created database. In this tutorial, we will create a new database by clicking the Create button.
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7) Now you need to specify the path to your database. You can also encrypt your database by providing a password, or change the database character set (so you can use locale-specific characters).
8) After creating a database, it is usually a good idea to check if you can connect to it. This test can be performed by clicking the connect button. If you did everything correctly, you will receive a message similar to the one below. Once verified, click OK again to proceed to the next dialog box.
9) In the new window, you can see the connection string in the text box below. Click Next to continue. You will now be asked if you want to copy the database file to the current project.
If you select Yes, your database will appear in Solution Explorer, but any changes made to the database (for example,