[dba-VB] Vb.net ADO Equivelent to recordset

I have a couple of books as well.  Unfortunately they are all enamored with
how easy it is to bind this thing to a control etc. and just aren't
interested in discussing manipulating DATA directly - fields, records etc.

John W. Colby
www.ColbyConsulting.com 

Contribute your unused CPU cycles to a good cause:
http://folding.stanford.edu/

-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of Mike & Doris
Manning
Sent: Friday, July 22, 2005 9:08 AM
To: dba-vb at databaseadvisors.com
Subject: RE: [dba-VB] Vb.net ADO Equivelent to recordset


The best way to filter, sort, or find records in ADO.Net is to use a
DataView.  

You reference the variables by referring to the DataRow.

VarName = dr("VarName").Value

This website has several articles that should help clear up your confusion
http://www.devarticles.com/c/b/ADO.NET/

There are also several books on the subject.  I've got one put out by
Microsoft Press ISBN 0735614237

Doris Manning
Database Administrator
Hargrove Inc.


-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of John W. Colby
Sent: Friday, July 22, 2005 8:31 AM
To: dba-vb at databaseadvisors.com
Subject: RE: [dba-VB] Vb.net ADO Equivelent to recordset

Alright, in this specific case it sounds like I need a data reader.  However
I am accustomed to working with datasets where you can "seek" or "find"
specific records.  So far I haven't found anything like that.  The object
loads all the records into an array apparently and then you can go to a
specific row of the array, but only by the integer index.  

What am I missing?  Is there not something similar to rst.find
([fieldname]=somevalue)

And what about accessing the data by field name?

	MyVar = rst!VarName or
	MyVar = rst(VarName)

Both of these constructs are just essential.  How can you pull data out of
specific fields of a table without such constructs unless you work with
ordinal field positions which we have all been trained NEVER to do?

John W. Colby
www.ColbyConsulting.com 

Contribute your unused CPU cycles to a good cause:
http://folding.stanford.edu/

-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of Mike & Doris
Manning
Sent: Friday, July 22, 2005 8:11 AM
To: dba-vb at databaseadvisors.com
Subject: RE: [dba-VB] Vb.net ADO Equivelent to recordset


In .Net, you use DataAdapters, Datasets, and DataReaders to work with data.
A DataAdapter has Select, Insert, Update, and Delete commands.

You use the DataAdapter to fill a Dataset.  A Dataset can contain as many
tables as you like.  Each Table is indexed according to the order it is
added to the dataset.

A DataReader is a forward only dataset used when you just want to read
through the data once.

To work with the individual rows of a dataset, you would do the following.

Dim dt as Table	'Variable to hold the Dataset table you want to work with
Dim dr as Row	'Variable to refer to the row in the Dataset table.

Dt = ds.Tables(0)		'Set the DataTable variable to the Dataset
table

For Each dr in dt			'Loop through the rows in the
dataset
	'Do something		'Do something
Next dr				'Advance to the next row

Doris Manning
Database Administrator
Hargrove Inc.

-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of John W. Colby
Sent: Friday, July 22, 2005 7:27 AM
To: dba-vb at databaseadvisors.com
Subject: [dba-VB] Vb.net ADO Equivelent to recordset

I need to manipulate a recordset like I would in VBA

	with rst
		.findfirst
		SomeVar = !SomeField
		SomeVar2 = !SomeField2
	end with

What is the equivalent in ADO / .net?  I do not need to bind this to a
control, and all of the examples I am finding for .NET assume I just want to
bind it to a grid or a list or something.

In fact I do want to bind it to a class if that is possible.  I am building
a class pair where one class represents an individual record, and the parent
class represents a table (an indexed collection of the record classes).  The
first class has properties (variables) for each field in the table, and the
init will load the values in.  The second class needs to open the
"recordset", and then start instantiating the first class, initializing with
data from a given record, storing in a collection and moving to the next
record.

I have done all of this in ADO in VBA using the adodb.recordset object but
don't find the equivalent in .net.

John W. Colby
www.ColbyConsulting.com 

Contribute your unused CPU cycles to a good cause:
http://folding.stanford.edu/



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