Embedding a NexusDB server in a Data Abstract server? (repost from 3rd party ng)

(repost from 3rd party ng)

How to embed a NexusDB server in a DA server?

I assume the general idea would be to include and configure the nxSQLengine,
nxServerEngine, nxSession and nxDatabase components on a datamodule in the
DA server project, and then create a NexusDB driver connection string to
that database in the DA schema modeller.

Thorsten has mentioned that for the NexusDB DA connection string,

<<
The server must be:

ipv4://[servername@]ip-or-dns
np://servername[@computername]
embedded://name
registered://name

if the servername is completely empty it internally defaults to:
embedded://default

"registered://" allows you to setup a server engine (embedded or remote) and
related components on a datamodule... and register that with the driver. if
you look into the driver unit you will see the nexusdb specific interface
that allows you to register and unregister a external serverengine with the
driver.

>>

is this where I would need to use the "registered" approach, and how do I do
that (eg any pointers or code examples?)

Which is the 'drivers' unit referenced above (a specific name or folder
would be helpful . . . I've looked in both the NexusDB and DA source folders
and haven't spotted any obvious candidate for this drivers file).

Thanks!

Lauchlan M

See my notes posted in binaries group
on this - perhaps they will help.
JoeH

> See my notes posted in binaries group
> on this - perhaps they will help.

Since you register/unregister the server engine in 5 and 6,

5. In dm.oncreate add With uDANexusDBDriver.GetDriverObject as
INexusDBDriver do RegisterServerEngine(<server.name>,<server.servern name>),
e.g. ('nxServerEngine1','EmbeddedNexusServer')
6. In dm.ondestroy add with uDANexusDBDriver.GetDriverObject as
INexusDBDriver do UnRegisterServerEngine(<server.name>), e.g.
('nxServerEngine1');

instead of 7 and 10 -

7. In Schema Manager leave the servername for connection empty
10. For SM Database entry, a) use a "path://c:\...\" databasename or b) use
a "alias://aliasname" database name in SM, and use
serverengine.aliashandler.add... in datamodule's oncreate

- perhaps you could use the registered syntax?

eg server as 'registered://name'

as

<<
"registered://" allows you to setup a server engine (embedded or remote) and
related components on a datamodule... and register that with the driver. if
you look into the driver unit you will see the nexusdb specific interface
that allows you to register and unregister a external serverengine with the
driver.
>>

But Thorsten has also said that

<<
if the servername is completely empty it internally defaults to:
embedded://default
>>

which is what your approach looks like it is using.

Why would one want to use embedded over registered when it _is_ registered?

Thanks very much for this Joe. I'll give it a go as soon as I have some time
available for it.

Lauchlan M

> INexusDBDriver do
RegisterServerEngine(<server.name>,<server.servern name>),
> e.g. ('nxServerEngine1','EmbeddedNexusServer')

also, what would you use here if you were using a C/S arrangement with a
nxRemoteServerEngine?

Thanks!

Lauchlan M