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In order to perform any database operations, it is necessary to logon to a c-tree session. A session is terminated with a session logout.
To log on to a session, a CTSession object must be instantiated and then CTSession::Logon() method should be called to perform the session logon.
Example
// Logon to a session
CTSession ASession;
try
{
ASession.Logon("FAIRCOMS", "ADMIN", "ADMIN");
}
catch (CTException &err)
{
printf("Session logon failed with error %d\n", err.GetErrorCode());
}
Note: A useful sequence in code is to try to log on to the session, and if it fails with error FNOP_ERR (12), create the session dictionary and then log on again.
Example:
CTSession ASession;
CTBOOL createit = NO;
// try to logon to a session
try
{
ASession.Logon("FAIRCOMS", "ADMIN", "ADMIN");
}
catch (CTException &err)
{
if (err.GetErrorCode() == FNOP_ERR)
{
createit = YES;
}
else
throw;
}
if (createit)
{
ASession.Create("FAIRCOMS", "ADMIN", "ADMIN");
try
{
ASession.Logon("FAIRCOMS", "ADMIN", "ADMIN");
}
catch (CTException &err)
{
printf("Logon failed with error %d\n", err.GetErrorCode());
}
}
When operations with the session are no longer needed, it is necessary to logout from the session by invoking method CTSession::Logout().
Example
CTSession ASession;
// logon to a session
try
{
ASession.Logon("FAIRCOMS", "ADMIN", "ADMIN");
// ... perform some other operations ..
ASession.Logout();
}
catch (CTException &err)
{
printf("Logon or Logout failed with error %d\n", err.GetErrorCode());
}
