asked on

parameter ?_3 has no default value;problems updating access 2000 database

parameter ?_3 has no default value

good day, i have a dataset with 5 datatables and 4 of them

write to 1 datatable

e.g.
Brand,Colour,Wheels,Rims,
write to CARSALE

in all of the above tables, the fields are of different

types of course, e.g. number, text, etc

i get the error:
parameter ?_3 has no default value

and i dont know where to start looking what the parameter is.

thank you

Bob Learned

Are you using the OleDbDataAdapter?

Bob

jxharding

ASKER

Yes i am

Bob Learned

Select the data adapter, and view the properties in the Property Window. Find the SelectCommand, and expand that set. You will find a Parameter collection under the SelectCommand.

Bob

jxharding

ASKER

thanks thelearnedone
i went through all the dataadapters and could not fined one paramater in the collections
maybe thats my problem?

Bob Learned

What does the SQL statement for the SelectCommand look like?

Bob

jxharding

ASKER

i think i potentially found my problem
i have a table in my physical database called payment
which contains a
autoincrement field called PAYMENTID
a beneficiaryID Field (int)
and invoiceNR (string)

now i dragged this table into my dataset1.xsd
but there are other tables as well,
i did not make any relationships, although there are.
what i need to do is:

add a new entry to payment table
e.g. if last paymentID of PAYMENTTABLE was 1, the next would be 2
and then the beneficiaryID and invoiceNR would be filled in as well.
e.g.

PAYMENTID,BENEFICIARYID,INVOICENR
2 19 ABC123

this is how i attempted it:
dim addPayment as dataset1.paymentrow = dsBeneficiary.Payment.NewPaymentRow

addpayment.benefeciaryID = 19
addpayment.invoicenr = "ABC123"

daPayment.update(dsbeneficiary,"Payment")
dsbeneficiary.payment.addpaymentrow(addpayment)
dsbeneficiary.acceptchanges

and now it runs through the hole code,no problem
but when i got to the database itself, nothing was written

daPayment SQL:
SELECT BeneficiaryID,InvoiceNR FROM PAYMENT

Bob Learned

Try:

dsbeneficiary.payment.addpaymentrow(addpayment)

dsbeneficiary.acceptchanges

daPayment.update(dsbeneficiary,"Payment")

jxharding

ASKER

thanks bob, it works!
is there any chance of u giving me a little explanation on the three lines, e.g.
line 1 has to be run before line 2 because of ...

thanks!

jxharding

ASKER

the problem i have here is that i only know now how to copy

the examples and then from there i will use it as templates

in my program . i dont know why the following 3 lines work:

dsbeneficiary.payment.addpaymentrow(addpayment)
dapayment.update(dsbeneficiary,"Payment")
dsbeneficiary.acceptchanges

but these 3 lines DONT work:
dsbeneficiary.payment.addpaymentrow(addpayment)
dsbeneficiary.acceptchanges
dapayment.update(dsbeneficiary,"Payment")

Bob Learned

I don't usually do business this way, so I have to think through this:

(1) AddRow adds a new row.
(2) AcceptChanges for the dataset calls the AcceptChanges for all rows states that are not Unchanged.
(3) Update writes the changes back to the database from the disconnected dataset

I don't think that you even need the AcceptChanges for this to work--it might even explain why it doesn't work, since you mark the row as not changed, and then try to update the database.

Bob

jxharding

ASKER

thanks bob
when you mean you dont do business this way, what do you think im doing wrong?
since this is my 1st big vb.net app, id like to get it all right at the roots because i will obviously refer to following projects from this current one

ASKER CERTIFIED SOLUTION

Bob Learned

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial