Figure 12-8 The linked PostgreSQL tables in Access in VS .NET

Maker GTIN - 13 in VS .NET Figure 12-8 The linked PostgreSQL tables in Access

Figure 12-8 The linked PostgreSQL tables in Access
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Figure 12-9 Access error due to column constraint in PostgreSQL
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Use the Access Datasheet view to add some sample data to your tables Create a few sample bidders, one or two donors, then a few sample items to track As you enter data, notice that all of the constraints defined in the tables apply to the Access Datasheet view If you try adding an item with an invalid donorkey value, you get an error for the unmatched foreign key value, shown in Figure 12-9 The errors returned by the ODBC driver are very descriptive, allowing you to easily identify problems After you have entered some sample data to work with, you are ready to create queries, forms, and reports in Access using the data tables from the PostgreSQL server If you are familiar with how to use the Access environment, this should be a snap All of the programming functions and features in Access behave exactly the same when using the linked PostgreSQL tables As an example, click the Reports tab, then click the New button to create a new report Select the Design View mode to create the new report In the Choose the Table or Query Where the Object s Data Comes From drop-down box, select the auction_bidder table created from the link to the PostgreSQL auctionbidder table A blank report appears in the Design View window, linked to the bidder table
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Figure 12-10 Adding table fields to the detail report
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In the new report, you can now add bidder table fields within the Detail section of the report Select a textbox control and drag it into the Detail report area Double-click the new textbox to produce the properties for the control In the Properties window, the Control Source parameter contains all of the columns (fields) of the table You can select any of the columns to include in the report, shown in Figure 12-10 After adding the desired fields to the report, save the report and run it The resulting report shows the data retrieved from the bidder table on the PostgreSQL server, shown in Figure 12-11 Besides the standard arsenal of Access programming tools, you now can utilize PostgreSQL tools to help simplify your Access application You now have triggers, functions, and views available for your PostgreSQL tables You can use these features to help simplify and speed up your database applications
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In Access, the only way to combine table columns for reports is to create queries Unfortunately, the queries must now extract data across the network connection with the PostgreSQL server, causing additional delay Now, however, you have the complete power
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Microsoft Access and PostgreSQL
Figure 12-11 Running the bidder report
of the PostgreSQL database at your disposal Instead of using the old Access queries, you can create a PostgreSQL view that replicates the query by combining columns of multiple tables The difference is that once a view is created in the PostgreSQL database, it is available along with the regular tables as an external link When the view is accessed by users, the query is processed internally on the PostgreSQL server, and only the result set data is returned This greatly reduces the network overhead, and reduces the time required to process the query As an example, create the view itemswon in the auction schema:
create view auctionitemswon as select itemitemkey, bidderlastname, bidderfirstname, itemfinalbid from auctionitem natural inner join auctionbidder; grant all on auctionitemswon to auctioneer;
This view produces a result set that contains only the items that had successful winning bidders, and lists the names of the bidders instead of the bidder number
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Once the view is created in the PostgreSQL database, you can link a new Access table to the view by using the Get External Data feature described in the previous section The new view appears in the table list along with the other database tables You can now use the view as a regular table, using the Datasheet view to see the values in the view, and using the view in reports similar to the original query The one drawback is that, whereas Access allows you to use queries to insert data, you cannot insert new data into a PostgreSQL view The PostgreSQL developers are still working on that functionality
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