SSIS Script Component as a lookup

Posted on 2009-04-07
Last Modified: 2013-11-10
I am testing out different way of finding information in our database through SSIS.
I put together a script transform with an ADO.NET connection and just asked it to lookup based on a sql Script similar to what I would have done in a VB application, then used teh Fuzzy Lookup to check agains the persons email and Finally used the Lookup Transform to directly compare the same scenario I used the script transform i.e. the persons employee id + company id.  The Script transform matched roughly 50% and it wasn't consistent like scipping every other row, but the lookup found them all... I want to know what I did wrogn with my script so i can have more options in the future.
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper
Imports System.Data.SqlClient
Public Class ScriptMain
    Inherits UserComponent
    Dim connMgr As IDTSConnectionManager90
    Dim sqlConn As SqlConnection
    Dim sqlCmd As SqlCommand
    Public Overrides Sub AcquireConnections(ByVal Transaction As Object)
        connMgr = Me.Connections.SQLConnection
        sqlConn = CType(connMgr.AcquireConnection(Nothing), SqlConnection)
    End Sub
    Public Overrides Sub PreExecute()
        sqlCmd = New SqlCommand("SELECT frid FROM frdonmst WHERE (empid = @empid) and (cmpid = @cmpid)", sqlConn)
        With sqlCmd.Parameters
            .Add("@empid", SqlDbType.VarChar, 14)
            .Add("@cmpid", SqlDbType.BigInt, 10)
        End With
        sqlCmd.CommandTimeout = 1234567890
    End Sub
    Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
        Dim reader As SqlDataReader
        Dim cmpid As Decimal = Row.EnterpriseCompanyID
        Dim empid As String = Row.EmployeeID
        sqlCmd.Parameters("@empid").Value = Row.AccountID
        sqlCmd.Parameters("@cmpid").Value = cmpid
        reader = sqlCmd.ExecuteReader()
        If reader.Read() Then
            'If (reader("Frid").ToString() Is System.DBNull.Value) Then
            '    Row.frid2_IsNull = True
            If Row.AccountID <> "" Then
                Row.fridScript = CDec(reader("Frid").ToString())
            End If
            'End If
        End If
 End Sub
    Public Overrides Sub ReleaseConnections()
    End Sub
And the lookup transform used this 
select * from
	(select * from [dbo].[frdonmst]) as refTable
where RTRIM([refTable].[cmpid]) = ? and RTRIM([refTable].[empid]) = ?
Parameter0 = [Enterprise Company ID]
Parameter1 = [Account ID]
Again the same query just two different methods of goign about it and two very different results.

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Question by:ramos_rita
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LVL 22

Expert Comment

ID: 24088723
Why you want to replace the lookup (optimized component) by script component? DO you think you can get better performance using script component!?

Author Comment

ID: 24091765
I don't think i can get better performance.
There is a unique situation that exists with our files in that there are a number of differnt unique identifiers that could exist in our system.  We process files from multiple sources.
The script uses the unique business logic that exists with each scenario to make the comparisons.
i.e. a company could have potentially 3 company ids... this is a fact we can not do away with because each id has different rules associated with them.  
So the script basically does what the lookup transform does but instead of having to put 20 lookups and stringing them together with merges and what not to keep the flow, I can just write a script that accomplishes this task.  But I don't want to do it if I can't get the same accuracy.
LVL 22

Expert Comment

ID: 24095874
ok... very good! I see you understand this.
If I can help you let me know!!
Good luck!
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Author Comment

ID: 24096292
Can you tell me if I am doing something wrong in the script above?
It only returns a value some of the time.  I take the same script put it in SQL and execute it and it runs perfectly.
LVL 22

Expert Comment

ID: 24097739
but which is the error? only the output that returns one record?
Explain me better!

Author Comment

ID: 24106764
If the lookup component uses the same sql script and parameters as the script component and the lookup component finds all of the records and the scritp component doesn't (roughly less than half).

Is the way I am calling the reader correct?  Is there something that I am doing in the script component that is messing with my results?

LVL 22

Expert Comment

ID: 24155962
In perfomance I dont believe you can beat Lookup... but if you need this, ok...:-)

Now... could you send me the package, SQL scripts and some data to help you better?!

Author Comment

ID: 24158174
How do I send you the package when the extension is not approved
I am changing it to .txt just change the extension back to .dtsx

Accepted Solution

ramos_rita earned 0 total points
ID: 24158510
so in the process of trying to get you some sample data I looked and though to myself... why do I need to have this Row.NextRow() in there... doesn't it send in one row at a time.
So I took out the Row.NextRow() and it seems to be working just fine.
LVL 22

Expert Comment

ID: 24158944
also attach the script database (CREATE TABLES:...)
LVL 22

Expert Comment

ID: 24158963
ok! good!

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