Recipe 18.4 Export XML
You need to export Access data to an XML file so that it can be used
in another application.
There are several different approaches to exporting XML data from
Access, depending on the results that you want. The
18-04.MDB sample database has three tables,
Car, Customer, and
Preferences. The Car and Customer tables contain
information about cars and customers, and the Preferences table
contains information about which cars a customer prefers. The
Preferences table is related to both the Car and Customer tables.
18.104.22.168 Exporting all of the data in related tables
If you wish to export all of the
data in related tables, you can do so
easily from the File menu. Follow these steps to export data as XML
from the Preferences table:
Select the Preferences table in the database window. Right-click and
select Export, and choose XML in the Save as type drop-down list at
the bottom of the dialog box. Type a name for the XML file and click
the Export button.
Leave the default options selected, and click the More Options button
to expand the Lookup Data node. Check the two check boxes for Car and
Customer, as shown in Figure 18-11. Since Car and
Customer are both related to Preferences, Access allows you to select
Figure 18-11. The Export XML dialog box allows you to select related tables
Click the OK button. Figure 18-12 shows the XML that
is generated, with one element each of Preferences, Car, and Customer
Figure 18-12. Exporting related tables generates XML for the data in each table
22.214.171.124 Exporting the data from a query
You can create a query to
generate XML that displays data from the
Preferences table along with the associated lookup data for the Car
and Customer line items. Follow these steps to create the query and
output the results to XML:
Create a query in the query designer that displays the results you
wish to export to XML. The 18-04.MDB sample
database contains qryCustomer, which selects the
Customer name and Car make and model. Here is the SQL for the query:
SELECT [CustLname] & ", " & [CustFname] AS Name, Preferences.Ranking,
FROM Customer INNER JOIN (Car INNER JOIN Preferences
ON Car.CarID = Preferences.CarID) ON Customer.CustID = Preferences.CustID
ORDER BY [CustLname] & ", " & [CustFname], Preferences.Ranking;
Save the query and close the query designer. Right-click on the query
in the database window and choose Export. Then select XML in the Save
as type drop-down list at the bottom of the dialog box. Type a name
for the XML file and click the Export button.
Click the Export button and then click the More Options button.
Select the Schema tab and note that the default options include
exporting schema information in a separate schema document, as shown
in Figure 18-13. Click OK.
Figure 18-13. You can create a separate XSD schema document or embed the schema along with data in one XML document
This time the generated XML document contains an element for each row
that the query returns, as shown in Figure 18-14.
Figure 18-14. Exporting a query to XML produces an element for each row of data returned by the query
When you use the Access Export menu to export XML data,
Access reads the table relationships and allows you to select related
tables. The Schema tab on the Export dialog box allows you to select
whether to create a separate schema file or to embed the schema
information along with the data in one XML file. If you want to
export data showing lookup data from related tables, you can export a
query to XMLthis also allows you to select the rows and
columns to include or to export data based on expressions.