I'm new to SSIS. When I try to load data from an Excel File and there is another data flow task in the same package, it just fills the table with null data, e.g., dim_Alarm(null,null,null,null). However, when I try adding a new package and the data flow task is alone in the package, then the data is loaded.
Look at the Connection Manager for the Excel Source for the dataflow that is returning null data. There is probably some difference - maybe a typo error? - between the one that returns null data, and the one that loads the data from the file.
It is unlikely that the presence or absence of the other data flows is causing this problem, unless they are hitting the same Excel file, or they are hitting the same database table dim_Alarm. It is much more likely that there is some small difference between the data flow that loads nulls and the data flow that works (in the empty package).
You can also add a Data Viewer to the data flow that isn't behaving as you expect. The Data Viewer goes on one of the arrows between transformations in the data flow. When you run the package in BIDS, the Data Viewer will show you the data that flows through that point. If the data is missing, you may be able to see where it got lost. Is there data coming out of the Excel Source, but after the next transformation there is no more data? Then that is where the problem is.
Related
Using Microsoft Visual Studio Community 2015.
Goal of project
-create "*\temp\email" directory
-start program to extract all emails that include xls attachments to the previously created folder
-use for each loop to cycle through each file in the folder, process, and shift to sql table.
The problem I am running into is caused by either a blank excel document (which is occasionally sent from a remote location) or some of the original xls reports only contain 5 columns instead of 6 that I have mapped now. Is there any way to separate files that include the correct columns from those that do not match?
** as Long as these two problems do not exist I can run the ssis package and everything runs without issue.
Control flow;
File System Task (creates directory --->Execute Process Task (xls extraction)-->ForEach Loop(Data flow Task "email2Sql")
Data Flow;
Excel Source (uses expression ExcelFilePath,#user:filepath) delay validation ==true
(columns are initially set to f1-f6 and are mapped to for ex. a,b,c,d,e,f. The Older files that get mixed in only include a,b,c,d,e.) This is where I want to be able to separate the xls files
Conditional Transformation split (column names are not in row 1, this helps remove "null" values)
Ole Db destination (sql table)
Sorry for the amount of reading, but for the first post I tried to include anything that I thought may be relevant.
There are some tools out there which would allow you to open the excel doc and read it. However, I think the simplest thing to do would be to use SSIS out of the box:
1 - add a file system task after the data flow which reads the file.
2 - Make the precedence constraint from the data flow to the file system task "failure." This will cause that to only fire when the data flow task fails.
3 - set the file task to move the "bad" files to another folder
This will allow you to loop through all the files and move the failed ones. Ultimately, the package will end in failure. If you don't want that behavior you can change the ForceExecutionResult property to be success. However, it might be good to know that there were problems with some files so that they can be addressed.
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I'm writing a (what I thought to be a) simple SSIS package to import data from a CSV file into a SQL table.
On the Control Flow task I have a Data Flow Task. In that Data Flow Task I have
a Flat File Source "step",
followed by a Data Conversion "step",
followed by a OLE DB destination "step".
What I want to do is to move the source CSV file to a "Completed" folder or to a "Failed" folder based on the results of the Data Flow Task.
I see that I can't add a File System step inside the Data Flow Task, but I have to do it in the Control Flow tab.
My question is how do I do a simple thing like assign a value to a variable (I saw how to create variable and assign them a value at the bottom pane of Data Tools (2012)) depending of if the "step" succeeds or fails?
Thanks!
(You can tell by my question that I'm an SSIS rookie - and don't assume I can write a C# script, please)
I have used VB or C# scripts to accomplish this myself. Since you do not want to use scripts I would recommend using a different path for the project to flow. Have your success path lead to moving the file to completed and failure path lead to moving the file to failed. This keeps it simple and accomplishes what you are looking for.
What is the difference between control flow and data flow in a SSIS package along with some examples please.
Thanks.
In data flow task, it is mandatory that data needs to be made flown/transferred from a source to destination. Whereas in control flow task it is not.
Control Flow:
Control Flow is part of SQL Server Integration Services Package where you handle the flow of operations or Tasks.
Let's say you are reading a text file by using Data Flow task from a folder. If Data Flow Task completes successfully then you want to Run File System Task to move the file from Source Folder to Archive Folder. If Data Flow Task failed then you want to send email to your users by using Send Mail Task. The Precedence Constraints are used to control the execution flow.
Data Flow:
Data Flow is the part of SQL Server Integration Services Package, where data is extracted by using Data Flow Sources ( OLE DB Source, Raw File Source, Flat File Source , Excel Source etc.). After extacting data Data Flow Transformations such as Data Conversion, Derived Column, Lookup, Multicast,Merge etc are used to implement different business logics and finally written to Data Flow Destinations (OLE DB Destination, Flat File Destination,Excel Destination,DataReader Destination ADO NET Destination etc.)
Take a look at This post for more details.
Click on the Control Flow Tab and observe what items are available in Tool Box
Similarly Click on the Data Flow Tab observe what items are available
I want to skip a component of my data flow task, when this component throws a specific error.
To be precise, I read data from different source files/connections in my dataflow and process them.
The problem is that I can't be sure if all source files/connections will be found.
Instead of checking each source that I can connect to, I want to continue the execution of the data flow by skipping the component that reads data from the source.
Is there any possibility to continue the data flow after the component, which originally threw the error by jumping back from the On_Error-Eventhandler (of the data flow task) into the next component? Or is there any other way in continuing the data flow task execution by skipping the component?
As #praveen observed, out of the box you cannot disabled data flow components.
That said, I could see a use case for this, perhaps a secondary source that augments existing data which may or may not be available. If I had that specific need, then I'd need to write a script component which performs the data reading, parsing, casting of data types, etc when a file is present and sends nothing, but keeps the metadata in tact when no source is available.
You can do the following based on what I understand:
1) Create a script component that will check which source to go and check
2) Based on the Source connection you can assign the Source
I need to pull data from csv file to SQL Server table. Which Control task should I use ? Is it Flat File ? What is the correct method to pull data ?
The problem is I have used Flat File Task for pulling csv file. But the csv file whihc I am having, contains headings as first row, then on the third row, I have the columns, and data starting from fifth row.
Another problem is, in this file column details comes again after 1000 data ie columns appears in two rows. Is it possible to pull data ? If so, HOW ?
While Valentino's suggestion should work, I suggest that first you work with the provider of the file to get them to provide the data in a better format. When we get stuff like this we almost always push it back and ask for properly formatted data. We get it too about 90% of the time. It will save you work if they will fix their own drek. In our case, the customers providing the data are paying for our programming services and when they understand how substantial an increase in the cost to them, they are usually nmore than willing to accomodate our needs.
I believe you'll first have to transform your file into a proper CSV file so that the SSIS Flat File Source component (Data Flow) can read it. If the source system cannot produce a real CSV file, we usually create custom .NET applications for the cleanup/conversion task.
An Execute Process task (Control Flow) that executes the custom app can then be called prior to the Data Flow.