Re: MS Access DAO -> ADO.NET Migration

Thanks for the explanation Cor.

I really appreciate you explaining that and it is perfectly logical. I have
changed my mind bekoz I see the error of my ways.

It is true that I want to make my new NET implementation upward scaleble to
full SQL Server and I see the logic you explained in a multi user
environment with the disconnected datatables.

I will mull this thru because there is still a possibility that I will not
allow two users to access the same database file Read/Write at any given
moment. It is just not feasable to do so bearing in mind that a serious mix
up can result.

I need to improve my knowledge base.

Never too late to learn.

Garry



"Cor Ligthert [MVP]" <notmyfirstname@xxxxxxxxx> wrote in message
news:OaYzBLfDHHA.3212@xxxxxxxxxxxxxxxxxxxxxxx
Garry,

Your why's are probably because that in DOA you are handling recordsets.
A set of records where the identifier is in a connected state with the
Server.

In dotNet you are handling a dataset. Which has tables with rows in a
disconnected state.
For that it is much harder to handle the incremental identifier, there can
be (not wise) thousands of rows be supported to the server, while another
client was doing this as well. If your last record in your set is the last
added is even in this situation not for sure. (Although in SQL server it
is returned in your dataset, which makes than again a merge impossible).

Why this is changed, we are not thinking anymore about maximum 100
connected users, we think that there can be possible 10000 of users who
are using the database but although they have the data, they are not
connected at the same time.

Just trying to give you an impression from your why's, while Bill will
obvious not go in discussion. I am Dutch we never have problems with that.

:-)

Cor


"Garry" <garrygrolman@xxxxxxxxx> schreef in bericht
news:OtmlIgVDHHA.3676@xxxxxxxxxxxxxxxxxxxxxxx
EBook is interesting and certainly fills in a lot of 'hidden info' on the
SSCE BUT, the zip file of the code in the ebook iz missing.

HowDoIGetIt????

The GUID seems such a HEAVY THINGY for lowly auto-increment need. It
doesnt tell me anything about in what order the records were originally
created and is very taxing to verbalise its content to someone over the
phone. My usual records/DataRows have an auto-increment for the first
column AND, possibly, a unique identifier that I generate per database
and possibly, per table.

I turn your attention to a similar thingy with VB.NET where INI files are
not supported directly because Microsoft wants us to use XML format files
for this info. WHY make things more difficult. In VB6, they wanted us to
use the registry instead of INI files and now they want us, developers,
to use XML formatted files.

Remember the word KISS.

The book was a pleasure to read after the gibberish that Microsoft 'puts
out'. However, SQL Server Management Studio is nowhere to be found on my
machines and the msi will not install, dissappearing without a trace at
the end of 'configuring' files. No message. Nothing. I feel that I am not
alone in this and your book's content, in a large part, is based on this.

My basic inclinations are always to use code anyway. Something I learned
from trying to use the Data Tools in the first edition of VB6 7 odd years
ago.

My migration app works building a SSCE database file with imported data
from scratch in code using a source MDB. But, only the tables and some
data types which I do not use, may not be supported

Garry




"William (Bill) Vaughn" <billvaRemoveThis@xxxxxxxxxx> wrote in message
news:enbeq$ADHHA.4280@xxxxxxxxxxxxxxxxxxxxxxx
Frankly, (as I discuss in the book), I leaning away from Identity
(autoincrement) columns for a number of reasons. While these are
supported in SQLCe, there are situations where its SQL is too limited to
permit proper management and importing data with pre-assigned Identity
columns. I think that GUIDs (UniqueIdentifiers) make more sense for many
of these databases. This approach also works better when replicating the
database (which does not support Identity columns).

As far as getting VB to recognize the identity property of an Access/JET
database, I'm at a loss--sorry.

--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
INETA Speaker
www.betav.com/blog/billva
www.betav.com
Please reply only to the newsgroup so that others can benefit.
This posting is provided "AS IS" with no warranties, and confers no
rights.
__________________________________
Visit www.hitchhikerguides.net to get more information on my latest
book:
Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition)
-----------------------------------------------------------------------------------------------------------------------

"Garry" <garrygrolman@xxxxxxxxx> wrote in message
news:eTKvxZ$CHHA.3228@xxxxxxxxxxxxxxxxxxxxxxx
Framework 2

SQLCE 3.1 (Newest available - I think)

VS2005 Service pack Beta

Bought the book before I read your email.

The database is now copied with all the Data fields and values BUT, the
Primary key, AutoNumber is 'fudged' since in all my Access tables, the
first field, usually fldItemID, is the primary key and is an
autonumber. In the code, I know which is the first field.

The vb code does not manage to detect those specific properties.

field.Properties("ISAUTOINCREMENT").Value always equals False and so
does "KEYCOLUMN" even when I know that they are autonumber and
PrimaryKey.

Any solution??

Garry




"William (Bill) Vaughn" <billvaRemoveThis@xxxxxxxxxx> wrote in message
news:ON7skO$CHHA.4620@xxxxxxxxxxxxxxxxxxxxxxx
The SQLCe engine requires the 2.0 Framework. Do you have that
installed? What version of Visual Studio and SQL Server is installed?
I built database tables from scripts and wrote my own batch processor
to run them. These are included in the EBook examples.

hth

--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
INETA Speaker
www.betav.com/blog/billva
www.betav.com
Please reply only to the newsgroup so that others can benefit.
This posting is provided "AS IS" with no warranties, and confers no
rights.
__________________________________
Visit www.hitchhikerguides.net to get more information on my latest
book:
Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition)
-----------------------------------------------------------------------------------------------------------------------

"Garry" <garrygrolman@xxxxxxxxx> wrote in message
news:O9uVYB8CHHA.3836@xxxxxxxxxxxxxxxxxxxxxxx
Bill,

Perhaps you have an answer to the post two lines up.

I have other problems concerning the actual updating of data from my
accumulating DataTable but the basics of defining the tables with
attendant columns in a new SSCE data base are still not completely
solved. However, it does build the SSCE database, just some of the
definitions are not included.

Also, SSEv31VSTools-ENU.exe with the SQL data management utilities
will simply not install on my machine.

Garry

"William (Bill) Vaughn" <billvaRemoveThis@xxxxxxxxxx> wrote in
message news:u%23yx11zCHHA.4680@xxxxxxxxxxxxxxxxxxxxxxx
I also share your frustration with the Microsoft doc. You'll also
find that Intellisense does not help either. That's because it leads
you to think that specific types, methods, properties and events are
exposed when they are not--you won't find out until runtime. To deal
with this issue, I wrote my first EBook that walks through the entire
namespace and documents how it really works. It's written for
developers that are somewhat familiar with the SqlClient namespace
and ADO.NET in general (and those that have read my Hitchhiker's
Guide to Visual Studio and SQL Server book. This book is available at
http://www.hitchhikerguides.net/EBooks/Titles/5582.aspx.

Incidentally, Microsoft chose to change the name from SQL Server
Everywhere Edition to SQL Server 2005 Compact Edition about three
weeks ago. This version of the SQLCe DBMS engine has been tuned to
run in a Windows Forms environment. It's a fully relational database
that supports a subset of the TSQL SQL syntax. It's easy to deploy
(just copy 6 DLLs), is fully encryptable (so it's safer for data you
take to the field) and has twice the capacity of JET (4GB). SQLCe is
also designed to act as a Subscriber to a SQL Server-hosted
Publication. This can make it even easier to construct a distributed
architecture around SQLCe. MS is still doing work on the Visual
Studio and SQL Server Enterprise Manager development tools but the
EBook shows how to get around these limitations until the next SP or
Orcas ships.

Early next year, I'll be publishing the next in my series of EBooks.
This time on SQLCe Replication. I'm waiting for MS to finish work on
a new replication scheme that promises to be easier to use than
their current approaches.

--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
INETA Speaker
www.betav.com/blog/billva
www.betav.com
Please reply only to the newsgroup so that others can benefit.
This posting is provided "AS IS" with no warranties, and confers no
rights.
__________________________________
Visit www.hitchhikerguides.net to get more information on my latest
book:
Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition)
-----------------------------------------------------------------------------------------------------------------------

"Garry" <garrygrolman@xxxxxxxxx> wrote in message
news:%23SURfWtCHHA.4928@xxxxxxxxxxxxxxxxxxxxxxx
I had your problem basically and am working at the moment to
transfer existing Access 97 databases, (with data), to SQL Server
Everywhere, the new/old database referred to by William (Bill)
Vaughn. He suggested to me that I use this new database for .NET
2005 development where the DataBase requirements are similar to what
I had in a VB6/Access97 desktop application.

I am working on an app to migrate the Access 97 database to the
SSEv database and it is going relatively smoothly. Although, there
are some problems as I have defined in a post a little above yours.

I do not expect to edit relationships within the predefined
database OR re-define existing tables BUT, I have seen reference to
code which can do this.

If you try to find code samples - do yourself a favor, use Google
as William (Bill) Vaughn valiantly suggests. Microsoft help is, in
many cases, gibberish, which will not solve your query and will
just make you angry and frustrated. I wonder when Microsoft will
catch on a construct a serious library of code samples instead of
the meager offerings available.

If any of the Google search results take you to forums which
require that you 'join', be careful. Some of these forums even want
you to pay to join without you knowing if a solution is actually
available there.

Be careful about using Sponsored Links as these must have some
financial incentives involved otherwise they would not be there. It
costs money to put a Sponsored Link on a Google Search result page.
Every click means that money is earned by Google.

If you want to go down this route, use 'Reply to Sender' as well as
'Reply to group' and I will send you my code which is a near
completed application in VB.NET. I do not want to post my email
address here.

I need an exchange of info and opinions from another programmer who
is having similar, if not identical problems.

Garry


<moomoofatcow@xxxxxxxxxxx> wrote in message
news:1163796070.268114.323610@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have an VB6 program that I wrote that access Microsoft Access
databases using DAO. DAO has methods and properties that are
Access
specific (such as viewing and editing relationships or indexes on
the
tables) I want to write a new version of the program in VB 2005,
and I
want to use ADO.NET to access the data. Are there ways of changing
the
indexes or relationships of the MS Access database using ADO.NET?
Or do
I still need to use DAO to perform these operations?

As a side note, with a few tests that I've done already with some
queries, it seems like DAO is much faster than ADO.NET at running
queries and returning results. I am using the DataReader...does
anyone
have any information about the differences etc? Thanks in
advance...



















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