DatTables

[Steve Bezner]

I have a System.Data.DataTable in memory in which I would like to change the
value of a column for all rows. Is there a method to change all rows to a
specified value?

I know I can loop thru all the records (see below), but I would like to
update the datatable with 1 statement, perhaps an sql update statement? It
would also be useful if I can run an sql update statement on a datatable in
memory, instead of looping.

foreach (System.Data.DataRow row in System.Data.DataTable)
{
row["MyColumn"] = 0; // There has to be better way, then
to loop.....
}
Thanks,
Steve

[Ignacio Machin]

Hi Steve,

AFAIK that is not only the best way but the only :)

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Steve Bezner" <sb*****@softhome.net> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

I have a System.Data.DataTable in memory in which I would like to change the value of a column for all rows. Is there a method to change all rows to a
specified value?

I know I can loop thru all the records (see below), but I would like to
update the datatable with 1 statement, perhaps an sql update statement? It would also be useful if I can run an sql update statement on a datatable in memory, instead of looping.

foreach (System.Data.DataRow row in System.Data.DataTable)
{
row["MyColumn"] = 0; // There has to be better way, then
to loop.....
}
Thanks,
Steve

[Mariano Birnios]

Well... I would do it that way also!!

Cheers...
Mariano

-----Original Message-----
I have a System.Data.DataTable in memory in which I would like to change thevalue of a column for all rows. Is there a method to change all rows to aspecified value?

I know I can loop thru all the records (see below), but I would like toupdate the datatable with 1 statement, perhaps an sql update statement? Itwould also be useful if I can run an sql update statement on a datatable inmemory, instead of looping.

foreach (System.Data.DataRow row in System.Data.DataTable)
{
row["MyColumn"] = 0; // There has to be better way, thento loop.....
}
Thanks,
Steve

.

[Steve Bezner]

Thanks.

So what your saying if I want to update all records based on a certain
condition, then I would have to loop thru each record and check for the
condition before changing. It would be nice if I could pass an sql update
statement. Looping and checking sounds expensive.

Thanks for your response,
Steve
"Ignacio Machin" <ignacio.machin AT dot.state.fl.us> wrote in message
news:Ox**************@TK2MSFTNGP09.phx.gbl...

Hi Steve,

AFAIK that is not only the best way but the only :)

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Steve Bezner" <sb*****@softhome.net> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

I have a System.Data.DataTable in memory in which I would like to change

the

value of a column for all rows. Is there a method to change all rows to a specified value?

I know I can loop thru all the records (see below), but I would like to
update the datatable with 1 statement, perhaps an sql update statement?

It

would also be useful if I can run an sql update statement on a datatable

in

memory, instead of looping.

foreach (System.Data.DataRow row in System.Data.DataTable)
{
row["MyColumn"] = 0; // There has to be better way, then to loop.....
}
Thanks,
Steve

[Steve Bezner]

Thanks. I didn't want to have to get into transactions, because these are
changes that may need to be rolled back. It would have been nice if MSFT
implemented more of the "engine" as they did with the select statement.


"Ignacio Machin" <ignacio.machin AT dot.state.fl.us> wrote in message
news:e7**************@tk2msftngp13.phx.gbl...

Hi Steve,

Please remember that the classes of ADO.NET are mean to be an in memory
representation of a DB, they are not intended to work as a SQL engine.
If you are going to replace all the rows in a datatable, well it's better
that you call a SP in the database and replace the table with the new data
Hope this help,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Steve Bezner" <sb*****@softhome.net> wrote in message
news:eX**************@TK2MSFTNGP12.phx.gbl...

Thanks.

So what your saying if I want to update all records based on a certain
condition, then I would have to loop thru each record and check for the
condition before changing. It would be nice if I could pass an sql update

statement. Looping and checking sounds expensive.

Thanks for your response,
Steve
"Ignacio Machin" <ignacio.machin AT dot.state.fl.us> wrote in message
news:Ox**************@TK2MSFTNGP09.phx.gbl...

Hi Steve,

AFAIK that is not only the best way but the only :)

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Steve Bezner" <sb*****@softhome.net> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...
> I have a System.Data.DataTable in memory in which I would like to change the
> value of a column for all rows. Is there a method to change all

rows to

a

> specified value?
>
> I know I can loop thru all the records (see below), but I would like to > update the datatable with 1 statement, perhaps an sql update statement? It
> would also be useful if I can run an sql update statement on a datatable in
> memory, instead of looping.
>
> foreach (System.Data.DataRow row in System.Data.DataTable)
> {
> row["MyColumn"] = 0; // There has to be better

way, then

> to loop.....
> }
>
>
> Thanks,
> Steve
>
>
>