Access Cookbook, 2nd Edition [Electronic resources] نسخه متنی

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Access Cookbook, 2nd Edition [Electronic resources] - نسخه متنی

Ken Getz; Paul Litwin; Andy Baron

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Recipe 18.6 Export Unrelated Tables



18.6.1 Problem


You want to export Access data
to a single XML file, but the tables you wish to export are not
related to each other. How do you select tables and create a single
XML output file?


18.6.2 Solution


You must write VBA
code to export multiple unrelated tables to a single XML file. The
Access object model provides the ExportXML method, which has an
AdditionalData parameter that takes an object of type AdditionalData.

The

18-06.MDB sample database contains three
unrelated tables: Car,
Customer, and Dealer. There is
a single module, basExport, which contains the function
ExportUnrelated. The code creates an AdditionalData object, and adds
the Customer and Dealer tables to it. The ExportXML method uses the
Car table as the DataSource, and uses the AdditionalData object to
add the Customer and Dealer data to the output:

  Dim adTables As AdditionalData
Set adTables = Application.CreateAdditionalData
adTables.Add "Customer"
adTables.Add "Dealer"
Application.ExportXML _
ObjectType:=acExportTable, _
DataSource:="Car", _
DataTarget:="c:\test\Unrelated.xml", _
AdditionalData:=adTables

Figure 18-17 shows the XML file in a browser, with
only one element from each table expanded. All of the data from all
of the tables has been exported.


Figure 18-17. The XML output for unrelated tables



18.6.3 Discussion


A number of enhancements were added to the Access object model to
facilitate importing and exporting XML data programmatically. The
full syntax and all of the optional arguments for the
ExportXML
method are shown here:

ExportXML (ObjectType As AcExportXMLObjectType, Datasource As String,
[DataTarget As String], [SchemaTarget As String], [PresentationTarget as String],
[ImageTarget As String], [Encoding As AcExportXMLEncoding], [OtherFlags As Long],
[WhereCondition As String], [AdditionalData as AdditionalData])


The OtherFlags optional argument, which was not used in the example,
allows you to specify the following self-descriptive options, which
are exposed as AcExportXMLOtherFlags enumerations:

  • acEmbedSchema

  • acExcludePrimaryKeyAndIndexes

  • acRunFromServer

  • acLiveReportSource

  • acPersistReportML



When you need to apply a transform programmatically for either
importing or exporting XML, use the TransformXML method. The ImportXML and
ExportXML methods do not have DataTransform parameters.


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