On Fri, 2 Mar 2012, Marcos Douglas wrote:
On Wed, Feb 29, 2012 at 10:38 PM, Marcos Douglas wrote:
Hi,
The TField class have the FValueBuffer: Pointer attribute and have
also SetData(Buffer: Pointer,...) method that all T***Field subclasses
use to set themselves.
The methods AsInteger, AsStr
On Fri, Mar 2, 2012 at 1:02 PM, wrote:
>
>
> On Fri, 2 Mar 2012, Marcos Douglas wrote:
>
>> On Wed, Feb 29, 2012 at 10:38 PM, Marcos Douglas wrote:
>>>
>>> Hi,
>>>
>>> The TField class have the FValueBuffer: Pointer attribute and have
>>> also SetData(Buffer: Pointer,...) method that all T***Fie
> >> I need implements a similar structure but I need know if
> the use of
> >> Variant have very cost.
> >
> >
> > It has a cost.
> >
> > The reason for using a buffer in tdataset is that a record's data
> > normally is located in one continuous buffer, from which a value is
> > picked from th
The reason for using a buffer in tdataset is that a record's data normally
is located in one continuous buffer, from which a value is picked from the
right spot (including strings) You can't have that with variants.
Hm... right.
So, if I will have a class like a TParam, that have FValue: Variant
On Sat, Mar 3, 2012 at 9:25 AM, Alberto Narduzzi
wrote:
>>> The reason for using a buffer in tdataset is that a record's data
>>> normally
>>> is located in one continuous buffer, from which a value is picked from
>>> the
>>> right spot (including strings) You can't have that with variants.
>>
>>
On Sat, Mar 3, 2012 at 3:26 AM, Ludo Brands wrote:
>> >> I need implements a similar structure but I need know if
>> the use of
>> >> Variant have very cost.
>> >
>> >
>> > It has a cost.
>> >
>> > The reason for using a buffer in tdataset is that a record's data
>> > normally is located in one co
>
> Think in my class like a Business Object.
> The struct is very similar with TParams it has many TParam. The data,
> in a TParam, is save in a Variant type.
> I need something like:
> u := TmyBO.Create; // the name does matter
> u.Attr['name'].Value := 'Marcos'; // an instance is created and
On 3/3/2012 10:08, Marcos Douglas wrote:
Think in my class like a Business Object.
The struct is very similar with TParams it has many TParam. The data,
in a TParam, is save in a Variant type.
I need something like:
u := TmyBO.Create; // the name does matter
u.Attr['name'].Value := 'Marcos'; //
2012/3/3 Luiz Americo Pereira Camara :
> On 3/3/2012 10:08, Marcos Douglas wrote:
>>
>> Think in my class like a Business Object.
>> The struct is very similar with TParams it has many TParam. The data,
>> in a TParam, is save in a Variant type.
>> I need something like:
>> u := TmyBO.Create; // t
On Sat, Mar 3, 2012 at 12:57 PM, silvioprog wrote:
> 2012/3/3 Luiz Americo Pereira Camara :
>> On 3/3/2012 10:08, Marcos Douglas wrote:
>>>
>>> Think in my class like a Business Object.
>>> The struct is very similar with TParams it has many TParam. The data,
>>> in a TParam, is save in a Variant
On Sat, Mar 3, 2012 at 11:52 AM, Ludo Brands wrote:
>>
>> Think in my class like a Business Object.
>> The struct is very similar with TParams it has many TParam. The data,
>> in a TParam, is save in a Variant type.
>> I need something like:
>> u := TmyBO.Create; // the name does matter
>> u.Attr
> > Or define an internal storage format and convert the
> different types
> > to that format. That is also what variants are doing. The
> difference
> > is that variants have pre-defined assignment routines and
> conversions
> > between the different variant types which don't always fit what
On Sat, Mar 3, 2012 at 1:20 PM, Ludo Brands wrote:
>> > Or define an internal storage format and convert the
>> different types
>> > to that format. That is also what variants are doing. The
>> difference
>> > is that variants have pre-defined assignment routines and
>> conversions
>> > between th
In our previous episode, Ludo Brands said:
> When you are thinking of using JSON you can use AnsiString as the internal
> format eventually adding a datatype tag to avoid conversion data loss as
> much as possible.
ansistring is a decimal type. This incurs a binary to decimal conversion per
se (wh
> In our previous episode, Ludo Brands said:
> > When you are thinking of using JSON you can use AnsiString as the
> > internal format eventually adding a datatype tag to avoid
> conversion
> > data loss as much as possible.
>
> ansistring is a decimal type. This incurs a binary to decimal
> c
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