You may want to change the data source location of one or many reports at design time. For example, you may have recently changed the location of your database, and you need to run a batch program that will alter the Crystal Reports data source location.
Assume that you have a report called "c:\reports\test.rpt". This report has a data source location named Northwind eal (please refer to the See Also section of this Note for more details about the data sources).
Now you want to change the data source location for one or many reports at the push of a button. The new data source has exactly the same structure as the previous data source - only its location is now different (as set in the ODBC Data Sources).
In Visual Studio .NET, use a ReportDocument object to load a RPT file, change the data source location then export the ReportDocument to a RPT file on the hard drive to persist the changes.
Follow these steps:
1. In Windows, on the Start menu, click Run, then type "odbcad32". Click OK. The ODBC Data Source Administrator dialog box appears.
2. Create two System DSNs; one named Northwind eal and the other named Northwind van (refer to the See Also section).
3. Create a new Crystal report with its fields based on the Northwind eal DSN. Save this report as C:\reports\test.rpt.
4. Create a new Visual Studio project.
5. In Visual Studio, add CrystalDecisions.CrystalReports.Engine and CrystalDecisions.Shared as references.
6. Add a new form with a button. After adding the button to the form, double-click the button to set up the Button1_Click procedure. Add the following code (VB or C#) to the Button1_Click procedure:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim rep As ReportDocument = New ReportDocument
Dim path As String
Dim done As Boolean
'specify path to the report
path = "c:\reports\test.rpt"
'load the report
'use Logon method from c2011464
done = Logon(rep, "Northwind van", "Northwind", "<username>", "<password>")
private void Button1_Click(object sender, System.EventArgs e)
ReportDocument rep = new ReportDocument();
//specify path to the report
string path = "c:\\reports\\test.rpt";
//load the report
//use Logon method from c2011464
done = Logon(rep, "Northwind van", "Northwind", "<username>", "<password>");
7. Now you need to add code to change the data source. Add the code from Note 1214777 directly after the Button1_Click procedure.
8. Create an output directory on your test computer called C:\reports.
9. Build and run the solution.
10. The new report will save as C:\reports\test_export.rpt.
11. Open this new report, and refresh it once (you may have to log on to the database again). It will contain the new data source location as was specified in the code.
Type: ODBC (RDO)
Data Source Name: Northwind eal
User ID: sa
Type: ODBC (RDO)
Data Source Name: Northwind van
User ID: sa
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