HI all,
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Thanks
Robert
5  6553 
Robert Bravery wrote:
HI all,
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Thanks
Robert
The BeginExecuteRea der(...) and EndExecuteReade r...() are for performing the
ExecuteReader(. ..) method asynchronously. If you use ExecuteReader(. ..)
your thread is blocked while that method executes.
Using BeginExecuteRea der(...) (and the corresponding EndExecuteReade r(...))
ExecuteReader(. ..) will be executed in a seperate thread, allowing for
yours to continue processing. The BeginExecuteRea der(...) method will
require a callback method, and in that callback method, you will make a
call to EndExecuteReade r(...) to end the asynchronous operation, and
retreive the return value.
--
Hope this helps,
Tom Spink
Robert,
ExecuteReader is the synchronous version, whereas BeginExecuteRea der and
EndExecuteReade r are the asynchronous counterparts. EndExecuteReade r would be
called in the callback method that BeginExecuteRea der points to, to get your
resultset.
Peter
--
Co-founder, Eggheadcafe.com developer portal: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
"Robert Bravery" wrote:
HI all,
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Thanks
Robert
"Robert Bravery" <me@u.comwrot e:
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Just to add to what the other folks say: you don't necessarily have to
use a callback with BeginExecuteRea der(). You might be using it to get
simple concurrency, to mask latency:
IAR result = Begin...
// do other work
// now ready to pick up where we left off
reader = End...(result)
-- Barry
-- http://barrkel.blogspot.com/
HI,
Thanks for all the answers, I think I got most of that.
I started a beginexecuterea der, which makes a call to a SP, which does a
selec tinto, of about 40000 rows.
I notice that the rows are only "saved" once the endexecutreread er is called
and completed.
i can however moce the calling form around and do other things
Is this expected behavious.
I was hoping to show some progress of some kind to the user while the SP is
doing its insert.
Thanks
Robert
"Barry Kelly" <ba***********@ gmail.comwrote in message
news:vn******** *************** *********@4ax.c om...
"Robert Bravery" <me@u.comwrot e:
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Just to add to what the other folks say: you don't necessarily have to
use a callback with BeginExecuteRea der(). You might be using it to get
simple concurrency, to mask latency:
IAR result = Begin...
// do other work
// now ready to pick up where we left off
reader = End...(result)
-- Barry
--
http://barrkel.blogspot.com/
Progress? Easy way, show an animated gif in a picturebox while wating. You
would have to have some intermediate events that you could respond to in
order to be able to show partial progress points, and I don't think there are
any.
Peter
--
Co-founder, Eggheadcafe.com developer portal: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
"Robert Bravery" wrote:
HI,
Thanks for all the answers, I think I got most of that.
I started a beginexecuterea der, which makes a call to a SP, which does a
selec tinto, of about 40000 rows.
I notice that the rows are only "saved" once the endexecutreread er is called
and completed.
i can however moce the calling form around and do other things
Is this expected behavious.
I was hoping to show some progress of some kind to the user while the SP is
doing its insert.
Thanks
Robert
"Barry Kelly" <ba***********@ gmail.comwrote in message
news:vn******** *************** *********@4ax.c om...
"Robert Bravery" <me@u.comwrot e:
Whats the differe between useing Executereader() and
Beginexecuterea der()...endexec utereader() for asyncronys running of a SP
Just to add to what the other folks say: you don't necessarily have to
use a callback with BeginExecuteRea der(). You might be using it to get
simple concurrency, to mask latency:
IAR result = Begin...
// do other work
// now ready to pick up where we left off
reader = End...(result)
-- Barry
--
http://barrkel.blogspot.com/
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