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89 lines
3.0 KiB
Plaintext
89 lines
3.0 KiB
Plaintext
[[Property:title|ADO.NET Sample]]
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[[Property:weight|0]]
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[[Property:uuid|45d24893-63d0-c2a9-9f62-ead08ca4b901]]
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This sample consist of a command line showing how to interact with a database.
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The DataReader object is somewhat synonymous with a read-only/forward-only cursor over data. The DataReader API supports flat as well as hierarchical data. A DataReader object is returned after executing a command against a database. The format of the returned DataReader object is different from a recordset. For example, you might use the DataReader to show the results of a search list in a web page.
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==Compiling==
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To compile the example:
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# Launch EiffelStudio.
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# Select '''Use existing Ace (control file)''' and click '''OK'''
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# Browse to ''$ISE_EIFFEL\examples\dotnet\ado\ado3\''
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# Choose the Ace file for the version of the .net framework you are running
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# Choose the directory where the project will be compiled, by default the same directory containing the Ace file.
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# Click '''OK'''.
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==Running==
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After you launch the sample, the following output appears:
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<code>
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Customer ID Company Name
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ALFKI Alfreds Futterkiste
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ANATR Ana Trujillo Emparedados y helados
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ANTON Antonio Moreno Taquera
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AROUT Around the Horn
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BERGS Berglunds snabbkp
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BLAUS Blauer See Delikatessen
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BLONP Blondesddsl p`re et fils
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BOLID Blido Comidas preparadas
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BONAP Bon app'
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BOTTM Bottom-Dollar Markets
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BSBEV B's Beverages
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CACTU Cactus Comidas para llevar
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CENTC Centro comercial Moctezuma
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CHOPS Chop-suey Chinese
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COMMI Comrcio Mineiro
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CONSH Consolidated Holdings
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DRACD Drachenblut Delikatessen
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DUMON Du monde entier
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EASTC Eastern Connection
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... ... ...
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WILMK Wilman Kala
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WOLZA Wolski Zajazd
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</code>
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When the display is finished, the application wait for you to pressed the return key to finish the application.
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==Under the Hood==
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This application shows how to interact with a database. First the connection to the database is opened:
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<code>
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create connection.make ("server=(local)\NetSDK;Trusted_Connection=yes;database=northwind")
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</code>
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Then a request to the database is made:
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<code>
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create command.make ("select * from customers", connection)
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connection.open
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reader := command.execute_reader
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</code>
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Finally, the result of the request is displayed:
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<code>
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from
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ok := reader.read
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until
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not ok
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loop
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io.put_string (reader.item ("CustomerID").to_string)
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io.put_string ("%T%T")
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io.put_string (reader.item ("CompanyName").to_string)
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io.new_line
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ok := reader.read
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end
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</code>
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This sample uses the following ADO.NET classes:
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* <eiffel>SQL_DATA_READER</eiffel>
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* <eiffel>SQL_CONNECTION</eiffel>
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* <eiffel>SQL_COMMAND</eiffel>
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==Notes==
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This sample is translated from the example located in the QuickStart\howto\samples\adoplus subdirectory of the .NET Framework SDK samples directory of Microsoft Visual Studio .NET.
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