how to fetch records based on a condition
eg: I have 100 records in my table. Each time I would like to fetch 10 records at a time and then next set of 10 records until the table data ends.
First, Not sure why you would want to do that. You could specify the batch size in your destination.
But if you had any other significant reason do process 10 records at a time, then you use a foreach loop. There is no FOR..LOOP inside a data flow task.
option #1. Get the record count in the control flow, then create a for loop container and assign the variables. Inside the container, use a dataflow task and filter the source using the variables and process them.
NM
Related
I'm working on an SSIS package, the goal of the package is to take a spreadsheet that has several columns (we need PartNum, PartType, and Qty)
and for each row in the spreadsheet, run a query to calculate consumption and dump that into a separate sheet.
I've got a few problems, but my initial problem, is that I have two part types, Manufactured and Purchased. I only want to run the query against Manufactured pieces. How Can I do that in SSIS? I'm trying to set it up in the expression builder for the variable to equal "M", but this always evaluates to false.
Ideally, I want to filter on both Part Type = M and Qty > 0.
Here is a picture of the SSIS package, basically I'm using a data flow to bring a spreadsheet into a Recordset, and then in a Foreach loops, an OLEDB Source to pass query parameters (the part and qty variables) to export into a .csv
In the initial Data Flow Task from the Excel Source into the Recordset Destination, instead of loading the entire Excel file just select records that satisfy the given criteria. Unless you need these records for another purpose in the package, this will also prevent adding unused rows in the Recordset Destination and processing them in subsequent components. You can do this in the Excel Source by changing the Data Access Mode to SQL Command and adding the necessary filters. Excel can be queried similar to SQL. The query you want should be somewhat similar to the following, with the table and column names substituted appropriately. If the columns contain spaces in their names, these will need to be enclosed in square brackets. For example, PartType would be [Part Type].
SELECT
PartNum,
PartType,
Qty
FROM Excel_Sheet
WHERE PartType = 'M' AND Qty > 0
I want to know how can we find the number of records that has been inserted in SSIS?
There are lots of ways. One is to use the Record Count transformation to populate a variable, and look at the value of that variable after the DataFlow Task completes.
I'm just getting back into SSIS after several years of not using it. Here is what I need to do.
1) Read a value from a table and store into a variable
2) Create a data flow where I retrieve some number of rows
having a value greater than the value retrieved in #1.
3) Store the rows retrieved in #2 into another table
4) Determine the maximum value of a particular column from the rows
read in from step #2 and update the table referenced in #1.
The first three steps are easy, straightforward and working. However, I'm not certain the best way to accomplish #4.
Best can always be subjective but the most straight forward mechanism would be to add a Multicast component prior to your destination.
The Multicast will allow all the data flowing through the pipeline to show up in more than one stream. This is all done through pointers to the actual data buffers and doesn't result in physical copies of the data being strewn about.
From the Multicast, connect it to an Aggregate component and perform a MAX operation on whatever column you're using.
You know that you will only have one row coming from this aggregate so I'd use an OLE DB Command component to update your table #1. Something like
UPDATE ETLStatus
SET MaxValue = ?
WHERE PackageName = ?;
And then you'd map column names in like
MaxValue => Parameter_0
PackageName => Parameter_1
I am stuck on what is ultimately a simple task.
I have a process which loads files.
The process loads these files inside a for each container.
I need to rowcount the file that is currently being processed inside the for each container and if it is over a certain number of rows then fail the file.
I have tried a control flow task but that would ultimately bypass the for each loop.
The file currently being processed is determined via a variable in the for each container, and that is the one i need to count.
Any help would be appreciated.
Cheers
I would add a separate data flow in the For..Each to count the records and then have a Exprression and constraint linking to your main process so that you only process record counts > 0. Here's a rough layout ..
I have an SSIS data flow in SSIS 2012 project.
I need to calculate in the best way possible for every row field a sum of another table based on some criteria.
It would be something like a lookup but returning an aggregate on the lookup result.
Is there an SSIS way to do it by components or i need to turn to script task or stored procedure?
Example:
One data flow has a filed names LOT.
i need to get the sum(quantity) from table b where dataflow.LOT = tableb.lot
and write this back to a flow field
You just need to use the Lookup Component. Instead of selecting tableb write the query, thus
SELECT
B.Lot -- for matching
, SUM(B.quantity) AS TotalQuantity -- for data flow injection
FROM
tableb AS B
GROUP BY
B.Lot;
Now when the package begins, it will first run this query against that data source and generate the quantities across all lots.
This may or may not be a good thing based on data volumes and whether the values in tableB are changing. In the larger volume case, if it's a problem, then I'd look at whether I can do something about the above query. Maybe I only need current year's data. Maybe my list of Lots could be pushed into the remove server beforehand to only compute the aggregates for what I need.
If TableB is very active, then you might need to change your caching from the default of Full to a Partial or None. If Lot 10 shows up twice in the data flow, the None would perform 2 lookups against the source while the Partial would cache the values it has seen. Probably, depends on memory pressure, etc.