ADOSAMP Sample: Implements a Three-Tier Client/Server Application

This sample implements a three-tier client/server application using ADO, ATL, and compiler COM support.

The sample demonstrates how you can use compiler COM support with ADO to create a client/server database application. The application creates a small database of information about motorcycles and their top speeds. The application inserts rows, deletes rows, adds a new column, and searches on top speeds greater than a specified value.

Security Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices.

Building and Running the Sample

Note

If you are running Visual C++ Express Edition, you might need to install the Platform SDK before running this sample. For information on how to do this, see How to: Use Visual C++ Express Edition with the Microsoft Platform SDK.

To build and run this sample

  1. In the Control Panel, open the Administrative Tools folder and then double-click Data Sources (ODBC). If you are using either Microsoft Access or SQLServer with this sample, add a (User) DSN with a Data Source Name "HotBikes." If you are using Microsoft Access, create a database called Test.

  2. For SQLServer, provide the server name and under Options specify a Database Name, for example, HotBikesDB.

  3. Open the solution ADOSamp.sln.

  4. Add the directory containing MsADO15.dll to the Include files path in the VC++ Directories dialog box.

  5. If either OLE DB or ADO has not been installed, install it from the Visual Studio CD or DVD. It will most likely be installed in:

    \Program Files\Common Files\System\ADO\MsADO15.dll

  6. If you created a SQL Server data source for this sample in step 1, uncomment the following line in RunADO.cpp: 

    //#define SQLSERVER

    This disables a SQL command that Microsoft Access can understand but SQLServer cannot:

    "ALTER TABLE HotBikes DROP COLUMN ID"

  7. On the Build menu, click Build Solution.

  8. On the Debug menu, click Start Without Debugging. A table will be created (deleting the existing one), and several rows will be added, deleted, and updated. A new column will be added and populated with data. In the case of Microsoft Access, a column will be deleted. The contents of the table will be displayed after each modification.