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Crystal Report does not show data when 1 of the 2 datatables in dataset return empty rows

Hi all, I'm using VS.net and crystal reports and currently facing this problem.

I have 2 datatables in the dataset

The first datatable is queried from the stored prod in sql sever 2000.
The second is a date, made into a datatable and added as a second table to the dataset that was queried

                        'Add datefrom and dateto into dataset
                        Dim dt As DataTable = New DataTable
                        Dim dr As DataRow
                        dt.Columns.Add("StartDate", Type.GetType("System.DateTime"))
                        dt.Columns.Add("EndDate", Type.GetType("System.DateTime"))
                        dr = dt.NewRow()
                        dr(0) = startDate
                        dr(1) = endDate
                        dt.Rows.Add(dr)
                        dt.TableName = "Table1"
                        ds.Tables.Add(dt)

The report shows fine when the first datatable return rows but when it the first datatable returns no rows, I still want the report to show the values of the secondtable.

Help Needed, Much Appreciated
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alvinlau
Asked:
alvinlau
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1 Solution
 
Éric MoreauSenior .Net ConsultantCommented:
You need to change your relations into CR between your 2 tables from INNER JOIN to LEFT JOIN (into the Visual Linking).

Sorry not being able to be more precise as I don't have .Net on this PC right now!

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frodomanCommented:
emoreau is correct.  

Go to your report and in Field Explorer right-click on Database Fields and select "Visual Linking Expert".  Then select the links tab.   Click directly on the line linking the tables and this will enable the "Link Options" button.  Click it, then change the link type from "Inner Join" to "Left Outer Join"

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alvinlauAuthor Commented:
Hi, the 2 tables are not linked together. Its just purely a dataset with 2 datatables passed through. Here is the xsd of it.

<?xml version="1.0" standalone="yes"?>
<xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:Locale="en-GB">
        <xs:complexType>
            <xs:choice maxOccurs="unbounded">
                <xs:element name="Table">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="ID" type="xs:string" minOccurs="0" />
                            <xs:element name="DepCode" type="xs:string" minOccurs="0" />
                            <xs:element name="ListedCountryCode" type="xs:string" minOccurs="0" />
                            <xs:element name="AccountGroup" type="xs:string" minOccurs="0" />
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                <xs:element name="table2">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="dateFrom" type="xs:dateTime" minOccurs="0" />
                            <xs:element name="dateTo" type="xs:dateTime" minOccurs="0" />
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:choice>
        </xs:complexType>
    </xs:element>
</xs:schema>
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Éric MoreauSenior .Net ConsultantCommented:
It is not the schema. It is really the report.

Right-click anywhere it's grey on your report, select Database from the popup menu and then "Visual Linking expert".
From the "Database Expert" dialog, right-click the link between the tables and select "Link Options".
From the "Link Options" dialog, select "Left Outer Join" as the join type.
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alvinlauAuthor Commented:
I went to Visual Linking expert and there are no link joining the 2 tables together.
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Éric MoreauSenior .Net ConsultantCommented:
If your 2 tables are used in the Details, add links and be sure they are Left Joined
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alvinlauAuthor Commented:
Hi emoreau,

Thanks for being with me.

The second table contains the dateFrom and dateTo columns with 1 row. This datatable is used in the header portion of CR to display the stored input dates that the user keys from the web application. This datatable is added to dataset which contains the first table(used in the details section of the CR) that is queried from the database. So if there is no rows returned, I want the dateFrom and dateTo to be still shown in the header portion. Unfortunately, it does show only when the first table contains rows.

There is no relation between the both tables and I don't see a need to link the tables. Thanks

Help still needed =)
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Éric MoreauSenior .Net ConsultantCommented:
You don't need a datatable to pass that kind of values.

Add textobjects to your report, set their (name) and use this method to set their values:

    Protected Sub ApplyTextObject(ByVal vstrTextObject As String, ByVal vstrTextValue As String)
        Try
            CType(ReportToPrint.ReportDefinition.ReportObjects(vstrTextObject), CrystalDecisions.CrystalReports.Engine.TextObject).Text = vstrTextValue

        Catch ex As Exception
            'For i As Int32 = 0 To ReportToPrint.ReportDefinition.ReportObjects.Count - 1
            '    Trace.WriteLine(ReportToPrint.ReportDefinition.ReportObjects(i).Name)
            'Next
            Throw ex
        End Try
    End Sub

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alvinlauAuthor Commented:
Hey emoreau,

I'm trying your method now, how do you set the name to the text objects?
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alvinlauAuthor Commented:
Silly me I've found it. I think I'll be able to proceed from here thanx
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alvinlauAuthor Commented:
hey thanx emoreau, it certainly solved my prob. Kudos to ya
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