Populate data from Access DB to vb.net dataset

Question

3.00/5 (1 vote)

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Hi all,

I have a problem.

Situation:
I have declared a string to hold the data from a query

VB

strSQL=GetPayment(strDateFrm,strDateTo)
cnCMD = New OleDbCommand(strSQL, cnDB)
cnCMD.CommandType = CommandType.Text
rdr = cnCMD.ExecuteReader
If Not (IsNothing(strSQL)) Then
                        If rdr.Read Then  -------> "problem occurs here"
                            While rdr.Read

I want to ask anyone who can solve me for:
If data from database is empty, what should I do? Because when data is not exist in database, it will fill empty to DataSet and DataReader will find nothing and skip the step where I put a condition if nothing in database, it will fill "-NA-" string value.

Or can anyone tell me the other code for inserting data from database to DataSet.
I'm confused about the answer that I found in search engine because mostly they put the data into something such as ListView, DataGridView.
It confuses me.

I use an object objPayment as medium to retrieve data from database and fill in DataSet column.
For example:

VB

If Not (IsDBNull(rdr("intMPAJRecpNo"))) Then
         objChqDataRow.strReceiptNo = rdr("intMPAJRecpNo")
Else
         objChqDataRow.strReceiptNo = "- NA -"
End If

If someone has the other way from my way to manipulate data from using DataReader, kindly help me.

Posted 13-Nov-11 4:05am

Luiey Ichigo

Updated 13-Nov-11 4:13am

André Kraak

v2

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Pete _BSC · Answer 1 · 2011-11-13T04:52:00

Solution 1

You should first test that your rdr has rows.

Typically I write:

VB

While rdr.HasRows ANDALSO rdr.Read
'... code ...
End While

If you do this:

VB

If rdr.Read Then 
    While rdr.Read

You are actually skipping a row as you are calling .Read twice (Once on IF and again entering your WHILE).

Posted 13-Nov-11 4:52am

Pete _BSC

Updated 13-Nov-11 4:53am

v2