Обсуждение: VB and ODBC: found

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VB and ODBC: found

От
Sbragion Denis
Дата:
Hello,

after a fast look I found a reference in the MS knowledge base:

http://support.microsoft.com/support/kb/articles/q109/8/00.asp

little excerpt:

Before you can edit an external ODBC table, the table must contain a unique
index. If you get the following error message, you might not have a unique
index on the table:

   Can't perform operation; it is illegal.

You could also receive this error if the Data1.Recordset.Updatable flag is
not set to True. Also, if you set the Data1.Options property to 64
(SQL_PASSTHROUGH), the data control will not be updatable.

Hope it helps.

Bye !

    Dr. Sbragion Denis
    InfoTecna
    Tel, Fax: +39 39 2324054
    URL: http://space.tin.it/internet/dsbragio

Re: [INTERFACES] VB and ODBC: found

От
Stephen Davies
Дата:
> Hello,
>
> after a fast look I found a reference in the MS knowledge base:
>
> http://support.microsoft.com/support/kb/articles/q109/8/00.asp
>
> little excerpt:
>
> Before you can edit an external ODBC table, the table must contain a unique
> index. If you get the following error message, you might not have a unique
> index on the table:
>
>    Can't perform operation; it is illegal.
>
> You could also receive this error if the Data1.Recordset.Updatable flag is
> not set to True. Also, if you set the Data1.Options property to 64
> (SQL_PASSTHROUGH), the data control will not be updatable.
>
OK. Maybe that is the difference. I never use data controls to access ODBC
databases: the performance is awful.

There also seem to be strange constraints placed by MS on some types of
recordsets: the "safest" seem to be tables rather than dynasets etc.

I always use direct calls to the ODBC DLL. This is quite easy and, in general,
gives performance comparable with native SQL commands - and does not require
unique indexes or other strange MS policies..

Having said that, my personal preference is to have a unique key in every
table and if there is no obvious candidate, to make that key a
system-generated sequence number.

Cheers,
Stephen.
========================================================================
Stephen Davies Consulting                                            scldad@sdc.com.au
Adelaide, South Australia.                                             Voice: 61-8-82728863
Computing & Network solutions.                                     Fax: 61-8-82741015