Running an SSIS package when a trigger file arrives on Windows Server using Sql*Agent

We are trying to run an SSIS package when a trigger file arrives on Windows Server.

So I need a job to run every 5 minutes, and if it finds my_trigger_file.txt, then run an SSIS package.

What kind of job would this be ? Sql Agent would run the job "check for trigger file", and then Step 1 is to see if the file exists. If it's there, then Step 2 run the SSIS package.

I have little experience with Sql Agent, but mostly looking for - what kind of job polls for the file ? And then if "success", Sql Agent has to know that to run the SSIS package.
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Alaska CowboyAsked:
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yechanConnect With a Mentor Commented:
Have you considered using a Script Task that looks for the file?  If the script task finds a file, set a local variable to indicate that it found a file.  Afterwards, modify the "Precedent Constraint" to check for that value.  If true, continue, otherwise set it to false so that no other tasks are running.
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Alaska CowboyAuthor Commented:
or, how about this . . . .

my SSIS package is set to run every 5 minutes.

the first step of the package is to look for the trigger file. If it's there, continue. If not, exit gracefully.

- or -
just run my package which tries to load my_trigger_file.txt. If it's not there, then exit gracefully (as opposed to specifically looking for it . . . )
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Alaska CowboyAuthor Commented:
Script task sounds good, I'll have a look at that . . .

where do I find precedent constraint ?
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Alaska CowboyAuthor Commented:
ok, that scripting . . . I'm going to need a little help with that . . .
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yechanConnect With a Mentor Commented:
Here is the code that I use in my Script tasks to check for the existence of a file:

string filePath = Dts.Variables["User::cFolderLocation"].Value.ToString();

DirectoryInfo dirInfo = new DirectoryInfo(filePath);

FileInfo[] files = dirInfo.GetFiles("*.zip");

if (files != null && files.Length >= 1)
{
   Dts.Variables["User::vFileExists"].Value = true;
 }
else
{
   Dts.Variables["User::vFileExists"].Value = false;
}

Open in new window


The precedence constraints are the arrows that connect the various tasks.  If you double-click the arrow that connects the Script task with the next task, you'll have to enter the following expression in the expression task:

@[User::vFileExists]==true

So, if the vFileExists variable contains the value "true", it will continue onto the next task, otherwise nothing will happen and the package will go back to sleep.
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Alaska CowboyAuthor Commented:
ok, just what I was looking for, thank you. I'll give it a shot.
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Alpesh PatelConnect With a Mentor Assistant ConsultantCommented:
To do that there is a new task "Filewatcher" (3rd party SSIS task). It works like filesystemwatcher of Windows.

It triggers when file came/update/delete as actions are configured on that folder.

you will get it from here


File watcher task
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Alaska CowboyAuthor Commented:
PatelAlpesh, sorry, I missed your comment. I will have to check with SSIS admin if they are interested in installing this task.
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Alaska CowboyAuthor Commented:
yechan, I need to check for only one file (with a variable name, which I have working).

I think the only thing I need to change is to use "file" instead of "files" for clarity, then say "GetFiles(Dts.Variables("InputFile").Value)

here's your code again:
string filePath = Dts.Variables["User::cFolderLocation"].Value.ToString();

DirectoryInfo dirInfo = new DirectoryInfo(filePath);

FileInfo[] files = dirInfo.GetFiles("*.zip");

if (files != null && files.Length >= 1)
{
   Dts.Variables["User::vFileExists"].Value = true;
 }
else
{
   Dts.Variables["User::vFileExists"].Value = false;
}

Open in new window

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Alaska CowboyAuthor Commented:
also, I am using VB scripting . . .
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Alaska CowboyAuthor Commented:
Ok, I got the precedence constraint working, but it's hard coded

Dts.Variables("FileExists").Value = False

I need to get your code in VB language, will try and poke around on this.
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yechanConnect With a Mentor Commented:
Hi William,

I don't code in VB.net, however, check this link out.  It will convert C# code to vb.net and vice versa.

http://www.developerfusion.com/tools/convert/csharp-to-vb/
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Alaska CowboyAuthor Commented:
yechan, great ! thank  you.
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Alaska CowboyAuthor Commented:
I got it to work with this simple command:

        If My.Computer.FileSystem.FileExists(Dts.Variables("InputFile").Value) Then

            Dts.Variables("FileExists").Value = True
        Else
            Dts.Variables("FileExists").Value = False
        End If

so, success !
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yechanCommented:
Awesome!!!!  Glad to read that you got it to work.
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Alaska CowboyAuthor Commented:
very helpful
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