You are not logged in.
- Topics: Active | Unanswered
#1 2016-09-29 23:29:07
- igors233
- Member
- Registered: 2012-09-10
- Posts: 241
Client side custom field in TSQLTable/TSQLTableJSON
I would like to add RecNo (1 to number of records) field to TSQLTableJSON before displaying it in TSQLTableToGrid.
TSQLTableJSON content is taken from server with TSQLRecord.CreateAndFillPrepare/FillPrepare it has several fields and I would like to add calculated/custom RecNo field as first one, so final result would be something like:
RecNo Field1 Field2
---------------------------------
1 Value11 Value12
2 Value21 Value22
3 Value31 Value32
...
underlying TSQLRecord is something like:
TSQLSomeRec = class(TSQLRecord)
private
FField1: RawUTF8;
FField2: RawUTF8;
published
property Field1: RawUTF8 index 5 read FField1 write FField1;
property Field2: RawUTF8 index 10 read FField2 write FField2;
end;What is the prefered/mORMot way of doing something like this?
Offline
#3 2016-10-03 00:06:59
- igors233
- Member
- Registered: 2012-09-10
- Posts: 241
Re: Client side custom field in TSQLTable/TSQLTableJSON
Isn't it the already existing ID field?
Or an explicit increasing number?
Sorry for late reply, field doesn't exists in the table, it's not ID. It should be a new client side only field (I need it for displaying and printing) and it's values should go from 1 to number of records (so auto increasing).
Offline
#4 2016-10-03 13:20:26
- Junior/RO
- Member
- Registered: 2011-05-13
- Posts: 210
Re: Client side custom field in TSQLTable/TSQLTableJSON
Like a TTable.RecNo?
Offline
#5 2016-10-03 14:22:43
Re: Client side custom field in TSQLTable/TSQLTableJSON
So the TSQLTableJSON needs to be modified once loaded, or the JSON could simply be modified before affecting it to the TSQLTableJSON.
I guess using TDocVariant is a very easy way of adding such a field values, before filling TSQLTableJSON.
Online
#6 2016-10-03 17:23:17
- igors233
- Member
- Registered: 2012-09-10
- Posts: 241
Re: Client side custom field in TSQLTable/TSQLTableJSON
> So the TSQLTableJSON needs to be modified once loaded, or the JSON could simply be modified before affecting it to the TSQLTableJSON.
> I guess using TDocVariant is a very easy way of adding such a field values, before filling TSQLTableJSON.
Thanks, I was hoping there's some better way to avoid double processing of json dataset.
I'll try first to make TSQLTableJSON descendant and see if it's possible to make inplace changes.
On a general note, I think that TSQLTable would benefit of adding some easy to use calculated fields, like we have in standard TDataset.
Offline