SSIS Source SQL Statement to include variables - ssis

Question

In my work place's SQL Server 2008 set up, we have set up a database table called DATE_RANGE_CONTROL with two columns: startDate and endDate of data type DateTime. Our SSIS packages extract data from an Oracle Database for a set date range so most of our SQL code in the DB Source Editor takes the form of:
SELECT COLUMN1,COLUMN2,COLUMN3,TRANSACTION_DATE
FROM SOURCE_DATABASE_TABLE
WHERE TRANSACTION_DATE BETWEEN startDate AND endDate
What I want to do is to set the startDate and endDate dynamically so that at the time of execution, the query gets the values from the DATE_RANGE_CONTROL table. I have looked at using the SQL Command from variable as an option but I cannot figure out how to feed the values of startDate and endDate from the DATE_RANGE_CONTROL table to the DB Source SQL command.
I have done something similar in the SQL SERVER 2000 DTS packages where I was setting the SQLCommand property of the data pump dynamically using the ACTIVEX script task. How do i do it in SSIS?

Answer 1

After spending a considerable amount of time on Google and looking through the Microsoft SQL Server 2008 SSIS documentation, I have finally cracked it. So proud of myself. The solution is thus:
In SQL Server Business Intelligence Development Studio, create a new SSIS package.
Create 3 variables, I called mine startDate, endDate and strDataSourceSQL. Make sure they all have a scope level of Package and ensure thay have Data Types of Int32, Int32 and String respectively..
On the Control Flow tab, drag a Script Task from the toolbox to the Control Flow pane. Right click it and choose edit from the pop up menu.
On the Script page, click on the ellipsis to the right of ReadWriteVariables. Tick the variables you created in step 1 i.e. user::startDate, user::endtDate and user::strDataSourceSQL. You can rename your script task on the General page. It is good practice.
On the Script page,click on the Edit Script... button to reveal a visual studio IDE pane with some pre-written code.
Make the following changes. At the top of the page, you will notice a few lines the import namespaces and classes to use. Edit the lines of code and make sure you have the following lines:
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Data.OleDb;
Go to the menu Project > Add Reference. On the .NET tab, make sure you select Microsoft.SqlServer.DTSPipelineWrap and Microsoft.SqlServer.DTSRuntimeWrap Credit to DotNetMonster for the tip.
In the public void Main() method, you will see a comment that says // TODO: Add your code hereWe will replace that line or add the following lines of code. By the way, I am using OLEDB for my data source and data destination.
//Declare variables
Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSConnectionManagerDatabaseParameters100 cmParams;
System.Data.OleDb.OleDbConnection oleDbConn;
ConnectionManager cm;
Int32 strStartDate;
Int32 strEndDate;
String startDateSQL = "SELECT StartDate FROM DATE_RANGE_CONTROL";
String endDateSQL = "SELECT EndDate FROM DATE_RANGE_CONTROL";
//Declare and assign Connection manager
cm = Dts.Connections["YOUR_OLEDB_CONNECTION_MANAGER_NAME"];
//Set Connection paramters
cmParams = cm.InnerObject as Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSConnectionManagerDatabaseParameters100;
//Instantiate the Oledb connection
oleDbConn = cmParams.GetConnectionForSchema() as OleDbConnection;
Assign the strStartDate and strEndDate variables, the result of running a function that we will display later. All it does provide an SQL command to the OLEDB connection.
strStartDate = (int)assignSQLCommand(startDateSQL,oleDbConn).ExecuteScalar();
strEndDate = (int)assignSQLCommand(endDateSQL, oleDbConn).ExecuteScalar();
//Assign the startDate and endDate variables the value of the SQL resultset
Dts.Variables["startDate"].Value = strStartDate;
Dts.Variables["endDate"].Value = strEndDate;
Declare a variable called dataSourceSQL of type string and assign your DataSource SQL code to it. Replace the date range values with the values of the variables above. For me, the code is as follows:
String dataSourceSQL = "SELECT COLUMN1,COLUMN2,COLUMN3,TRANSACTION_DATE
FROM SOURCE_DATABASE_TABLE
WHERE TRANSACTION_DATE BETWEEN '"+Dts.Variables["startDate"].Value +"' AND '"+Dts.Variables["endDate"].Value+"'";
Then assign the value of dataSourceSQL to your strDataSourceSQL package variable
Dts.Variables["strDataSourceSQL"].Value = dataSourceSQL ;
Outside the curly brackets of the public void Main() method, add the following function we discussed earlier.
public OleDbCommand assignSQLCommand(String SqlCommand, OleDbConnection oledbconn)
{
return new System.Data.OleDb.OleDbCommand(SqlCommand, oledbconn);
}
Go to the menu Build > Build [script name]. Save it and close the script page. Finally, all that is left is to create a Data Source task. Go to the Data Flow tab, drag an OLE DB DB Source to the pane. Right click on the OLE DB Source and choose edit. On the Connections Manager page, select your OLE DB connection manager and on the Data access mode choose SQL command from variable. In the variable name select user::strDataSourceSQL. As long as you set up your script task to run before your data flow, the job is done!

Answer 2

This is how I could do that.
In the OLE DB Source, enter your sql statement and enter ? as the parameter.
click [Parameters...] button and pick your variable from the list