Traversing a Simple Rowset
The following example shows a quick and easy database access that does not involve commands. The following consumer code, in an ATL project, retrieves records from a table called Artists in a Microsoft Access database using the Microsoft OLE DB Provider for ODBC. The code creates a CTable table object with an accessor based on the user record class CArtists. It opens a connection, opens a session on the connection, and opens the table on the session.
#include <atldbcli.h>
CDataSource connection;
CSession session;
CTable<CAccessor<CArtists> > artists;
// Open the connection, session, and table, specifying authentication
// using Windows NT integrated security. Hard-coding a password is a major
// security weakness.
connection.Open(CLSID_MSDASQL, "NWind", NULL, NULL,
DBPROP_AUTH_INTEGRATED);
session.Open(connection);
artists.Open(session, "Artists");
// Get data from the rowset
while (artists.MoveNext() == S_OK)
{
cout << artists.m_szFirstName;
cout << artists.m_szLastName;
}
The user record, CArtists, looks like this:
class CArtists
{
public:
// Data Elements
CHAR m_szFirstName[20];
CHAR m_szLastName[30];
short m_nAge;
// Column binding map
BEGIN_COLUMN_MAP(CArtists)
COLUMN_ENTRY(1, m_szFirstName)
COLUMN_ENTRY(2, m_szLastName)
COLUMN_ENTRY(3, m_nAge)
END_COLUMN_MAP()