Hi, Mirco !

I'm new to IBO, but anyway I'd like to show
the solution that I'm actually using

1. create a constraint for your not nullable field

alter table <tableName> add constraint
<constraintName>
check ( fieldName is Not Null ) ;

please make your <constraintName> short, unique,
and "auto descriptive", for example,

NN_tablename_fieldname

2. somewhere in your Delphi App, I do it in an on
'OnPostError' event, you can compare the name
of your constraint with the content of E.message,
something like :

if ( pos( constraintName, e.message ) <> 0 ) then
// the error is your nullable field related
// so you can display a customized message
// to the end-user
// 'cause your constraintName is unique
// the context is completely known
begin
// display a message and suggestions
// set the appropriate value
// for the action to be taken
// abort, fail, etc.
end ;

3. toward a global solution...

In fact I've created a table containing
the constraints names, the customized messages,
and the suggestions, initialize an Array at my app's
startup and whenever I get an IB_Error and I try
to find in my array the row containing the
constraintName found in the TIB_Error.message
If the search succeeds, I can display the
corresponding message and suggestions.

Hope it can help

Joseph

> Anyone knows how to display a custom message instead
> of IBO's built-
> in "xxx is a required field" message? I tried the
> database's onError
> event, but it gets only called when the database
> reports an error
> which in this case does not happen (IBO seems to
> check the required
> fields before posting - good, but how do I change
> the msg then?)
>
> Mirco
>
>
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