Retreive datatable schema command erases all clients events

Data Abstract
1

in 10.0.0.1449, Retreive datatable schema command erases all fields events.

I double checked this behaviour by creating a new dataabstract vcl application with custom server and used the default pctrade schema. The i added on tbl_customer.name a onChange event. If i retreive the schema, the event is cleared.

im using delphi 10.3 update 2.

2

Hi,

You have assigned event to the some field, is it correct?

if yes, this is as expected because retrieving of schema does:

  • calls Fields.Clear;
  • reads every field from stream

workaround: you should reassign field events after loading table schema

3

Hello Evgeny,

my problem is that that happens in IDE when i right click on MemDataTable, a behavior that didn’t happen in the past. I know thata solution whould be to assign events on code.

Thanks for your reply.

4

Hi,

for client-calculated/located fields events will be preserved, but for usual fields, events will be lost always.
this behavior wasn’t changed for ages

5

Hi,
i beg to differ. As you can see on this screencast on version 9- that was the default behavior

6

Hi,
I can reproduce this behavior with the latest DA9 and can’t with DA10.
also I can’t find what code causes it because TDADataTable.LoadSchema method wasn’t changed…

7

Can you declare field events using business client rules as with table events? If true then you can fix that way. If dont I believe have no sense (and is incorrect) loading schema at design time delete fields events, dont you believe?

8

Thanks, logged as bugs://83273

9

I’ve found a reason for such failure. will fix.

1 Like
10

bugs://83273 got closed with status fixed.