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Posted to dev@tuscany.apache.org by Adriano Crestani <ad...@gmail.com> on 2007/01/09 11:09:02 UTC
DAS C++ needing volunteers and advises
Luciano Resende and me are developing the DAS C++. I started developing it
translating the classes from DAS Java to DAS C++. I've already converted
most of classes to C++, but the project is not compiling successfully yet
and I think it will take some time to.
There are many things to be done yet:
- As I am not used to work with pointers and references explicity as C++
does, there are some pointers and refereces that are not being used
correctly and need to be fixed.
- Most of functions' arguments and return are referenced objects. There is
necessary to rethink which function argument and return need to be a pointer
or a reference. I'm begginer with C++ and I need some advises about it.
- To define which argument, return and function will be set as "const" or
not.
- To define which function will be set as "virtual" or not.
- To evaluate which and where to delete the allocated objects. I really need
some advises, cause it's being difficult for me to see which is the best to
delete these objects.
Any volunteer to help with that I'm accepting ; ). But I think I can get by
for while. However I'd like invite some volunteers to help me in the
implementation of these classes:
- ResultSet, ResultSetMetaData, PreparedStatement and CallableStatement:
these classes belongs to the JDBC API and they are used a lot in DAS Java.
As known, the ODBC API is a procedural API and turns to be very difficult to
use a procedural API in a OO application. There is no need to implement
these classes as complex as they are in JDBC, only what is really necessary
for DAS C++.
- DASObject: I initially created this class to set in place of the Java
Object class. The DAS Java has some functions that takes the Object class as
arguments and as C++ has nothing like it(as far as I know) I created this
class. I've not assigned any function to this class(an empty class). Maybe
there is another simpler way to substitute the Java Object class, needing
some suggestions here too.
I will sending right now to Luciano the DAS C++ project, then he may upload
it in his sandbox as soon as possible.
Adriano Crestani
Re: DAS C++ needing volunteers and advises
Posted by Geoffrey Winn <ge...@googlemail.com>.
On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
>
>
> - To define which function will be set as "virtual" or not.
>
>
In Java, all instance methods are virtual unless they are marked final;
whereas in C++ by default, they are not. One way that you could deal with
this is just to ignore it. If you already have derived classes that override
a method in a parent class then the compiler will complain and that tells
you that you need to make the parent's method virtual. On the other hand,
any time that you find that you want to override a method from a parent then
again, you can change the parent. If you find you are making this change a
lot, then that will probably show/tell you where you need to change a block
of methods.
Regards,
Geoff.
Re: DAS C++ needing volunteers and advises
Posted by Adriano Crestani <ad...@gmail.com>.
The DASObject I'm handling using a void* and a short that defines the
object's type that the void* points:
typedef void* DASPointer;
class DASValues {
const static short DAS_BOOL = 1;
const static short DAS_STRING = 2;
};
class DASObject {
private:
DASPointer dasPointer;
short dasValueType;
public:
DASObject(void);
DASObject(DASPointer pointer, short value);
virtual ~DASObject(void);
void setDASObject(DASPointer pointer, short value);
DASPointer getDASPointer(void) const;
short getDASObject(void) const;
};
Any suggestion?
Adriano Crestani
On 1/16/07, Adriano Crestani <ad...@gmail.com> wrote:
>
> There are a lot Geoffrey : (...I'm compiling class by class and seeing the
> errors and fixing them. If you want to help to fix the code that would be
> great. But actually I don't know how to assign the classes you or me is
> going to work, the problem is that sometimes when I'm fixing the errors of
> some class I need to fix the header of another, do you understand? How could
> be the best way to divide the classes for us to work on them parallelly?
>
> Adriano Crestani
>
> On 1/15/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> >
> > On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
> > >
> > >
> > > - As I am not used to work with pointers and references explicity as
> > C++
> > > does, there are some pointers and refereces that are not being used
> > > correctly and need to be fixed.
> >
> >
> > I think Luciano has checked-in the DAS code. Can you point to some
> > examples
> > in the code of the pointer of reference issues that you think need to be
> > fixed?
> >
> > Regards,
> >
> > Geoff.
> >
> >
>
Re: DAS C++ needing volunteers and advises
Posted by Adriano Crestani <ad...@gmail.com>.
There are a lot Geoffrey : (...I'm compiling class by class and seeing the
errors and fixing them. If you want to help to fix the code that would be
great. But actually I don't know how to assign the classes you or me is
going to work, the problem is that sometimes when I'm fixing the errors of
some class I need to fix the header of another, do you understand? How could
be the best way to divide the classes for us to work on them parallelly?
Adriano Crestani
On 1/15/07, Geoffrey Winn <ge...@googlemail.com> wrote:
>
> On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
> >
> >
> > - As I am not used to work with pointers and references explicity as C++
> > does, there are some pointers and refereces that are not being used
> > correctly and need to be fixed.
>
>
> I think Luciano has checked-in the DAS code. Can you point to some
> examples
> in the code of the pointer of reference issues that you think need to be
> fixed?
>
> Regards,
>
> Geoff.
>
>
Re: DAS C++ needing volunteers and advises
Posted by Geoffrey Winn <ge...@googlemail.com>.
On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
>
>
> - As I am not used to work with pointers and references explicity as C++
> does, there are some pointers and refereces that are not being used
> correctly and need to be fixed.
I think Luciano has checked-in the DAS code. Can you point to some examples
in the code of the pointer of reference issues that you think need to be
fixed?
Regards,
Geoff.
Re: DAS C++ needing volunteers and advises
Posted by Geoffrey Winn <ge...@googlemail.com>.
Going back to your original questions, I'll try to comment on some of them
one at a time, starting with ...
On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
>
>
> - DASObject: I initially created this class to set in place of the Java
> Object class. The DAS Java has some functions that takes the Object class
> as
> arguments and as C++ has nothing like it(as far as I know) I created this
> class. I've not assigned any function to this class(an empty class). Maybe
> there is another simpler way to substitute the Java Object class, needing
> some suggestions here too.
>
>
You are right, C++ has nothing like the Java Object class, so C++ has no
common root to its object hierarchies. I think you will find it hard to
create a C++ class that can function like Java Object. For one thing _every_
class that you create will have to inherit from DASObject (or whatever),
furthermore, what do you then do about STL classes like vector and list? You
might need to create your own versions of those, such as DASvector which
will have to inherit from both std::vector and DASObject. So, in my opinion,
the general case is too hard.
A better thing to do is look at exactly what values the Java spec is passing
into those Object parameters and try to create a common root class for just
those values. For example, in SDO we encounter this problem when trying to
deal with the various primitive data types (boolean, short, float, ...). The
Java spec defines some methods that take (or return) an Object type,
intending that type to be a wrapped primitive value (eg Byte for a byte
etc). C++ has no direct equivalent, however we can define an SDOValue class
that looks a bit like
class SDOValue {
union {
bool a;
float f;
// etc
} value;
enum {
SDObool,
SDOfloat,
// etc
} datatype;
}
and then we can pass instances of SDOValue around within methods that are
interested in any one of the primitive data types.
There's nothing magic about this particular class, it's just an example. The
important point is that in SDO for Java, in many of the places where Object
is used as a type, what is _really_ meant is not "any object at all" but
rather "one of the primitive data types". If you can spot cases similar to
that in DAS then you can create classes to represent the things that are
really being passed instead of trying to recreate a generic Object class.
Please let me know if that doesn't make sense and I'll have another go :-)
Regards,
Geoff.
Re: DAS C++ needing volunteers and advises
Posted by Adriano Crestani <ad...@gmail.com>.
Thanks a lot Geoffrey, I think it will work ; )
Adriano Crestani
On 1/11/07, Jean-Sebastien Delfino <js...@apache.org> wrote:
>
> [snip]
> Pete Robbins wrote:
> > On 09/01/07, Luciano Resende <lu...@gmail.com> wrote:
> >>
> >> To get more people helping on this I was wondering if we should add the
> >> code
> >> to the trunk, where more people would have access to review and
> >> contribute
> >> to the code. Could you guys advise me where is best for me to place
> this
> >> initial code (non working at the moment) ? Should it go to my sandbox
> >> ? Or
> >> I
> >> could place it under someplace inside the cpp sdo directory in trunk,
> >> but
> >> leave it out of the main build ?
> >
> >
> > I think this should be kept separate from SDO. I would put it undert
> > tuscany/cpp/das
> >
>
> +1, I think it makes sense to create a new directory under tuscany/cpp
> for this.
>
> --
> Jean-Sebastien
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tuscany-dev-unsubscribe@ws.apache.org
> For additional commands, e-mail: tuscany-dev-help@ws.apache.org
>
>
Re: DAS C++ needing volunteers and advises
Posted by Jean-Sebastien Delfino <js...@apache.org>.
[snip]
Pete Robbins wrote:
> On 09/01/07, Luciano Resende <lu...@gmail.com> wrote:
>>
>> To get more people helping on this I was wondering if we should add the
>> code
>> to the trunk, where more people would have access to review and
>> contribute
>> to the code. Could you guys advise me where is best for me to place this
>> initial code (non working at the moment) ? Should it go to my sandbox
>> ? Or
>> I
>> could place it under someplace inside the cpp sdo directory in trunk,
>> but
>> leave it out of the main build ?
>
>
> I think this should be kept separate from SDO. I would put it undert
> tuscany/cpp/das
>
+1, I think it makes sense to create a new directory under tuscany/cpp
for this.
--
Jean-Sebastien
---------------------------------------------------------------------
To unsubscribe, e-mail: tuscany-dev-unsubscribe@ws.apache.org
For additional commands, e-mail: tuscany-dev-help@ws.apache.org
Re: DAS C++ needing volunteers and advises
Posted by Pete Robbins <ro...@googlemail.com>.
On 09/01/07, Luciano Resende <lu...@gmail.com> wrote:
>
> To get more people helping on this I was wondering if we should add the
> code
> to the trunk, where more people would have access to review and contribute
> to the code. Could you guys advise me where is best for me to place this
> initial code (non working at the moment) ? Should it go to my sandbox ? Or
> I
> could place it under someplace inside the cpp sdo directory in trunk, but
> leave it out of the main build ?
I think this should be kept separate from SDO. I would put it undert
tuscany/cpp/das
--
> Luciano Resende
> http://people.apache.org/~lresende
>
> On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
> >
> > There is NO DAS C++ specification, we are trying to base on how Java DAS
> > works, but making necessary design changes to integrate with SDO C++.
> >
> > --
> > Luciano Resende
> > http://people.apache.org/~lresende <http://people.apache.org/%7Elresende
> >
> >
> > On 1/9/07, Pete Robbins <ro...@googlemail.com> wrote:
> > >
> > > Is there a DAS C++ specification?
> > >
> > > On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> > > >
> > > > On 09/01/07, Adriano Crestani < adrianocrestani@gmail.com> wrote:
> > > > >
> > > > > Luciano Resende and me are developing the DAS C++. I started
> > > developing
> > > > it
> > > > > translating the classes from DAS Java to DAS C++. I've already
> > > converted
> > > > > most of classes to C++, but the project is not compiling
> > > successfully
> > > > yet
> > > > > and I think it will take some time to.
> > > > >
> > > > > There are many things to be done yet:
> > > > >
> > > > > - As I am not used to work with pointers and references explicity
> as
> > > C++
> > > > > does, there are some pointers and refereces that are not being
> used
> > > > > correctly and need to be fixed.
> > > > >
> > > > > - Most of functions' arguments and return are referenced objects.
> > > There
> > > > is
> > > > > necessary to rethink which function argument and return need to be
> a
> > > > > pointer
> > > > > or a reference. I'm begginer with C++ and I need some advises
> about
> > > it.
> > > > >
> > > > > - To define which argument, return and function will be set as
> > > "const"
> > > > or
> > > > > not.
> > > > >
> > > > > - To define which function will be set as "virtual" or not.
> > > > >
> > > > > - To evaluate which and where to delete the allocated objects. I
> > > really
> > > > > need
> > > > > some advises, cause it's being difficult for me to see which is
> the
> > > best
> > > > > to
> > > > > delete these objects.
> > > > >
> > > > > Any volunteer to help with that I'm accepting ; ). But I think I
> can
> > > get
> > > > > by
> > > > > for while. However I'd like invite some volunteers to help me in
> the
> > >
> > > > > implementation of these classes:
> > > > >
> > > > > - ResultSet, ResultSetMetaData, PreparedStatement and
> > > CallableStatement:
> > > > > these classes belongs to the JDBC API and they are used a lot in
> DAS
> > >
> > > > Java.
> > > > > As known, the ODBC API is a procedural API and turns to be very
> > > > difficult
> > > > > to
> > > > > use a procedural API in a OO application. There is no need to
> > > implement
> > > > > these classes as complex as they are in JDBC, only what is really
> > > > > necessary
> > > > > for DAS C++.
> > > > >
> > > > > - DASObject: I initially created this class to set in place of the
> > > Java
> > > > > Object class. The DAS Java has some functions that takes the
> Object
> > > > class
> > > > > as
> > > > > arguments and as C++ has nothing like it(as far as I know) I
> created
> > > > this
> > > > > class. I've not assigned any function to this class(an empty
> class).
> > > > Maybe
> > > > > there is another simpler way to substitute the Java Object class,
> > > > needing
> > > > > some suggestions here too.
> > > > >
> > > > > I will sending right now to Luciano the DAS C++ project, then he
> > > may
> > > > > upload
> > > > > it in his sandbox as soon as possible.
> > > > >
> > > > > Adriano Crestani
> > > > >
> > > >
> > > > Some of the issues you describe are common to SDO for C++ (and
> possiby
> > > SCA
> > > > too - I'm not sufficiently familiar with the code there). I can
> > > describe
> > > > what we did with SDO if that helps. I'm not sure if I'll have time
> to
> > > > actually contribute very much but I'll see what I can do.
> > > >
> > > > More to follow.
> > > >
> > > > Geoff.
> > > >
> > > >
> > >
> > >
> > > --
> > > Pete
> > >
> > >
> >
> >
> >
>
>
--
Pete
Re: DAS C++ needing volunteers and advises
Posted by Adriano Crestani <ad...@gmail.com>.
Hi Geoffrey, we're accepting any help. If you explain what you know about
SDO that could help in DAS C++ would be useful. Thanks!
Adriano Crestani
On 1/9/07, Adriano Crestani <ad...@gmail.com> wrote:
>
> The project was uploaded here:
> http://issues.apache.org/jira/browse/TUSCANY-1040
>
> On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
> >
> > To get more people helping on this I was wondering if we should add the
> > code
> > to the trunk, where more people would have access to review and
> > contribute
> > to the code. Could you guys advise me where is best for me to place this
> >
> > initial code (non working at the moment) ? Should it go to my sandbox ?
> > Or I
> > could place it under someplace inside the cpp sdo directory in trunk,
> > but
> > leave it out of the main build ?
> >
> > --
> > Luciano Resende
> > http://people.apache.org/~lresende<http://people.apache.org/%7Elresende>
> >
> > On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
> > >
> > > There is NO DAS C++ specification, we are trying to base on how Java
> > DAS
> > > works, but making necessary design changes to integrate with SDO C++.
> > >
> > > --
> > > Luciano Resende
> > > http://people.apache.org/~lresende<http://people.apache.org/%7Elresende><http://people.apache.org/%7Elresende
> > >
> > >
> > > On 1/9/07, Pete Robbins <ro...@googlemail.com> wrote:
> > > >
> > > > Is there a DAS C++ specification?
> > > >
> > > > On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> > > > >
> > > > > On 09/01/07, Adriano Crestani < adrianocrestani@gmail.com> wrote:
> > > > > >
> > > > > > Luciano Resende and me are developing the DAS C++. I started
> > > > developing
> > > > > it
> > > > > > translating the classes from DAS Java to DAS C++. I've already
> > > > converted
> > > > > > most of classes to C++, but the project is not compiling
> > > > successfully
> > > > > yet
> > > > > > and I think it will take some time to.
> > > > > >
> > > > > > There are many things to be done yet:
> > > > > >
> > > > > > - As I am not used to work with pointers and references
> > explicity as
> > > > C++
> > > > > > does, there are some pointers and refereces that are not being
> > used
> > > > > > correctly and need to be fixed.
> > > > > >
> > > > > > - Most of functions' arguments and return are referenced
> > objects.
> > > > There
> > > > > is
> > > > > > necessary to rethink which function argument and return need to
> > be a
> > > > > > pointer
> > > > > > or a reference. I'm begginer with C++ and I need some advises
> > about
> > > > it.
> > > > > >
> > > > > > - To define which argument, return and function will be set as
> > > > "const"
> > > > > or
> > > > > > not.
> > > > > >
> > > > > > - To define which function will be set as "virtual" or not.
> > > > > >
> > > > > > - To evaluate which and where to delete the allocated objects. I
> > > > really
> > > > > > need
> > > > > > some advises, cause it's being difficult for me to see which is
> > the
> > > > best
> > > > > > to
> > > > > > delete these objects.
> > > > > >
> > > > > > Any volunteer to help with that I'm accepting ; ). But I think I
> > can
> > > > get
> > > > > > by
> > > > > > for while. However I'd like invite some volunteers to help me in
> > the
> > > >
> > > > > > implementation of these classes:
> > > > > >
> > > > > > - ResultSet, ResultSetMetaData, PreparedStatement and
> > > > CallableStatement:
> > > > > > these classes belongs to the JDBC API and they are used a lot in
> > DAS
> > > >
> > > > > Java.
> > > > > > As known, the ODBC API is a procedural API and turns to be very
> > > > > difficult
> > > > > > to
> > > > > > use a procedural API in a OO application. There is no need to
> > > > implement
> > > > > > these classes as complex as they are in JDBC, only what is
> > really
> > > > > > necessary
> > > > > > for DAS C++.
> > > > > >
> > > > > > - DASObject: I initially created this class to set in place of
> > the
> > > > Java
> > > > > > Object class. The DAS Java has some functions that takes the
> > Object
> > > > > class
> > > > > > as
> > > > > > arguments and as C++ has nothing like it(as far as I know) I
> > created
> > > > > this
> > > > > > class. I've not assigned any function to this class(an empty
> > class).
> > > > > Maybe
> > > > > > there is another simpler way to substitute the Java Object
> > class,
> > > > > needing
> > > > > > some suggestions here too.
> > > > > >
> > > > > > I will sending right now to Luciano the DAS C++ project, then
> > he
> > > > may
> > > > > > upload
> > > > > > it in his sandbox as soon as possible.
> > > > > >
> > > > > > Adriano Crestani
> > > > > >
> > > > >
> > > > > Some of the issues you describe are common to SDO for C++ (and
> > possiby
> > > > SCA
> > > > > too - I'm not sufficiently familiar with the code there). I can
> > > > describe
> > > > > what we did with SDO if that helps. I'm not sure if I'll have time
> > to
> > > > > actually contribute very much but I'll see what I can do.
> > > > >
> > > > > More to follow.
> > > > >
> > > > > Geoff.
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Pete
> > > >
> > > >
> > >
> > >
> > >
> >
> >
>
Re: DAS C++ needing volunteers and advises
Posted by Adriano Crestani <ad...@gmail.com>.
The project was uploaded here:
http://issues.apache.org/jira/browse/TUSCANY-1040
On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
>
> To get more people helping on this I was wondering if we should add the
> code
> to the trunk, where more people would have access to review and contribute
> to the code. Could you guys advise me where is best for me to place this
> initial code (non working at the moment) ? Should it go to my sandbox ? Or
> I
> could place it under someplace inside the cpp sdo directory in trunk, but
> leave it out of the main build ?
>
> --
> Luciano Resende
> http://people.apache.org/~lresende
>
> On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
> >
> > There is NO DAS C++ specification, we are trying to base on how Java DAS
> > works, but making necessary design changes to integrate with SDO C++.
> >
> > --
> > Luciano Resende
> > http://people.apache.org/~lresende <http://people.apache.org/%7Elresende
> >
> >
> > On 1/9/07, Pete Robbins <ro...@googlemail.com> wrote:
> > >
> > > Is there a DAS C++ specification?
> > >
> > > On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> > > >
> > > > On 09/01/07, Adriano Crestani < adrianocrestani@gmail.com> wrote:
> > > > >
> > > > > Luciano Resende and me are developing the DAS C++. I started
> > > developing
> > > > it
> > > > > translating the classes from DAS Java to DAS C++. I've already
> > > converted
> > > > > most of classes to C++, but the project is not compiling
> > > successfully
> > > > yet
> > > > > and I think it will take some time to.
> > > > >
> > > > > There are many things to be done yet:
> > > > >
> > > > > - As I am not used to work with pointers and references explicity
> as
> > > C++
> > > > > does, there are some pointers and refereces that are not being
> used
> > > > > correctly and need to be fixed.
> > > > >
> > > > > - Most of functions' arguments and return are referenced objects.
> > > There
> > > > is
> > > > > necessary to rethink which function argument and return need to be
> a
> > > > > pointer
> > > > > or a reference. I'm begginer with C++ and I need some advises
> about
> > > it.
> > > > >
> > > > > - To define which argument, return and function will be set as
> > > "const"
> > > > or
> > > > > not.
> > > > >
> > > > > - To define which function will be set as "virtual" or not.
> > > > >
> > > > > - To evaluate which and where to delete the allocated objects. I
> > > really
> > > > > need
> > > > > some advises, cause it's being difficult for me to see which is
> the
> > > best
> > > > > to
> > > > > delete these objects.
> > > > >
> > > > > Any volunteer to help with that I'm accepting ; ). But I think I
> can
> > > get
> > > > > by
> > > > > for while. However I'd like invite some volunteers to help me in
> the
> > >
> > > > > implementation of these classes:
> > > > >
> > > > > - ResultSet, ResultSetMetaData, PreparedStatement and
> > > CallableStatement:
> > > > > these classes belongs to the JDBC API and they are used a lot in
> DAS
> > >
> > > > Java.
> > > > > As known, the ODBC API is a procedural API and turns to be very
> > > > difficult
> > > > > to
> > > > > use a procedural API in a OO application. There is no need to
> > > implement
> > > > > these classes as complex as they are in JDBC, only what is really
> > > > > necessary
> > > > > for DAS C++.
> > > > >
> > > > > - DASObject: I initially created this class to set in place of the
> > > Java
> > > > > Object class. The DAS Java has some functions that takes the
> Object
> > > > class
> > > > > as
> > > > > arguments and as C++ has nothing like it(as far as I know) I
> created
> > > > this
> > > > > class. I've not assigned any function to this class(an empty
> class).
> > > > Maybe
> > > > > there is another simpler way to substitute the Java Object class,
> > > > needing
> > > > > some suggestions here too.
> > > > >
> > > > > I will sending right now to Luciano the DAS C++ project, then he
> > > may
> > > > > upload
> > > > > it in his sandbox as soon as possible.
> > > > >
> > > > > Adriano Crestani
> > > > >
> > > >
> > > > Some of the issues you describe are common to SDO for C++ (and
> possiby
> > > SCA
> > > > too - I'm not sufficiently familiar with the code there). I can
> > > describe
> > > > what we did with SDO if that helps. I'm not sure if I'll have time
> to
> > > > actually contribute very much but I'll see what I can do.
> > > >
> > > > More to follow.
> > > >
> > > > Geoff.
> > > >
> > > >
> > >
> > >
> > > --
> > > Pete
> > >
> > >
> >
> >
> >
>
>
Re: DAS C++ needing volunteers and advises
Posted by Luciano Resende <lu...@gmail.com>.
To get more people helping on this I was wondering if we should add the code
to the trunk, where more people would have access to review and contribute
to the code. Could you guys advise me where is best for me to place this
initial code (non working at the moment) ? Should it go to my sandbox ? Or I
could place it under someplace inside the cpp sdo directory in trunk, but
leave it out of the main build ?
--
Luciano Resende
http://people.apache.org/~lresende
On 1/9/07, Luciano Resende <lu...@gmail.com> wrote:
>
> There is NO DAS C++ specification, we are trying to base on how Java DAS
> works, but making necessary design changes to integrate with SDO C++.
>
> --
> Luciano Resende
> http://people.apache.org/~lresende <http://people.apache.org/%7Elresende>
>
> On 1/9/07, Pete Robbins <ro...@googlemail.com> wrote:
> >
> > Is there a DAS C++ specification?
> >
> > On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> > >
> > > On 09/01/07, Adriano Crestani < adrianocrestani@gmail.com> wrote:
> > > >
> > > > Luciano Resende and me are developing the DAS C++. I started
> > developing
> > > it
> > > > translating the classes from DAS Java to DAS C++. I've already
> > converted
> > > > most of classes to C++, but the project is not compiling
> > successfully
> > > yet
> > > > and I think it will take some time to.
> > > >
> > > > There are many things to be done yet:
> > > >
> > > > - As I am not used to work with pointers and references explicity as
> > C++
> > > > does, there are some pointers and refereces that are not being used
> > > > correctly and need to be fixed.
> > > >
> > > > - Most of functions' arguments and return are referenced objects.
> > There
> > > is
> > > > necessary to rethink which function argument and return need to be a
> > > > pointer
> > > > or a reference. I'm begginer with C++ and I need some advises about
> > it.
> > > >
> > > > - To define which argument, return and function will be set as
> > "const"
> > > or
> > > > not.
> > > >
> > > > - To define which function will be set as "virtual" or not.
> > > >
> > > > - To evaluate which and where to delete the allocated objects. I
> > really
> > > > need
> > > > some advises, cause it's being difficult for me to see which is the
> > best
> > > > to
> > > > delete these objects.
> > > >
> > > > Any volunteer to help with that I'm accepting ; ). But I think I can
> > get
> > > > by
> > > > for while. However I'd like invite some volunteers to help me in the
> >
> > > > implementation of these classes:
> > > >
> > > > - ResultSet, ResultSetMetaData, PreparedStatement and
> > CallableStatement:
> > > > these classes belongs to the JDBC API and they are used a lot in DAS
> >
> > > Java.
> > > > As known, the ODBC API is a procedural API and turns to be very
> > > difficult
> > > > to
> > > > use a procedural API in a OO application. There is no need to
> > implement
> > > > these classes as complex as they are in JDBC, only what is really
> > > > necessary
> > > > for DAS C++.
> > > >
> > > > - DASObject: I initially created this class to set in place of the
> > Java
> > > > Object class. The DAS Java has some functions that takes the Object
> > > class
> > > > as
> > > > arguments and as C++ has nothing like it(as far as I know) I created
> > > this
> > > > class. I've not assigned any function to this class(an empty class).
> > > Maybe
> > > > there is another simpler way to substitute the Java Object class,
> > > needing
> > > > some suggestions here too.
> > > >
> > > > I will sending right now to Luciano the DAS C++ project, then he
> > may
> > > > upload
> > > > it in his sandbox as soon as possible.
> > > >
> > > > Adriano Crestani
> > > >
> > >
> > > Some of the issues you describe are common to SDO for C++ (and possiby
> > SCA
> > > too - I'm not sufficiently familiar with the code there). I can
> > describe
> > > what we did with SDO if that helps. I'm not sure if I'll have time to
> > > actually contribute very much but I'll see what I can do.
> > >
> > > More to follow.
> > >
> > > Geoff.
> > >
> > >
> >
> >
> > --
> > Pete
> >
> >
>
>
>
Re: DAS C++ needing volunteers and advises
Posted by Luciano Resende <lu...@gmail.com>.
There is NO DAS C++ specification, we are trying to base on how Java DAS
works, but making necessary design changes to integrate with SDO C++.
--
Luciano Resende
http://people.apache.org/~lresende
On 1/9/07, Pete Robbins <ro...@googlemail.com> wrote:
>
> Is there a DAS C++ specification?
>
> On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
> >
> > On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
> > >
> > > Luciano Resende and me are developing the DAS C++. I started
> developing
> > it
> > > translating the classes from DAS Java to DAS C++. I've already
> converted
> > > most of classes to C++, but the project is not compiling successfully
> > yet
> > > and I think it will take some time to.
> > >
> > > There are many things to be done yet:
> > >
> > > - As I am not used to work with pointers and references explicity as
> C++
> > > does, there are some pointers and refereces that are not being used
> > > correctly and need to be fixed.
> > >
> > > - Most of functions' arguments and return are referenced objects.
> There
> > is
> > > necessary to rethink which function argument and return need to be a
> > > pointer
> > > or a reference. I'm begginer with C++ and I need some advises about
> it.
> > >
> > > - To define which argument, return and function will be set as "const"
> > or
> > > not.
> > >
> > > - To define which function will be set as "virtual" or not.
> > >
> > > - To evaluate which and where to delete the allocated objects. I
> really
> > > need
> > > some advises, cause it's being difficult for me to see which is the
> best
> > > to
> > > delete these objects.
> > >
> > > Any volunteer to help with that I'm accepting ; ). But I think I can
> get
> > > by
> > > for while. However I'd like invite some volunteers to help me in the
> > > implementation of these classes:
> > >
> > > - ResultSet, ResultSetMetaData, PreparedStatement and
> CallableStatement:
> > > these classes belongs to the JDBC API and they are used a lot in DAS
> > Java.
> > > As known, the ODBC API is a procedural API and turns to be very
> > difficult
> > > to
> > > use a procedural API in a OO application. There is no need to
> implement
> > > these classes as complex as they are in JDBC, only what is really
> > > necessary
> > > for DAS C++.
> > >
> > > - DASObject: I initially created this class to set in place of the
> Java
> > > Object class. The DAS Java has some functions that takes the Object
> > class
> > > as
> > > arguments and as C++ has nothing like it(as far as I know) I created
> > this
> > > class. I've not assigned any function to this class(an empty class).
> > Maybe
> > > there is another simpler way to substitute the Java Object class,
> > needing
> > > some suggestions here too.
> > >
> > > I will sending right now to Luciano the DAS C++ project, then he may
> > > upload
> > > it in his sandbox as soon as possible.
> > >
> > > Adriano Crestani
> > >
> >
> > Some of the issues you describe are common to SDO for C++ (and possiby
> SCA
> > too - I'm not sufficiently familiar with the code there). I can describe
> > what we did with SDO if that helps. I'm not sure if I'll have time to
> > actually contribute very much but I'll see what I can do.
> >
> > More to follow.
> >
> > Geoff.
> >
> >
>
>
> --
> Pete
>
>
Re: DAS C++ needing volunteers and advises
Posted by Pete Robbins <ro...@googlemail.com>.
Is there a DAS C++ specification?
On 09/01/07, Geoffrey Winn <ge...@googlemail.com> wrote:
>
> On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
> >
> > Luciano Resende and me are developing the DAS C++. I started developing
> it
> > translating the classes from DAS Java to DAS C++. I've already converted
> > most of classes to C++, but the project is not compiling successfully
> yet
> > and I think it will take some time to.
> >
> > There are many things to be done yet:
> >
> > - As I am not used to work with pointers and references explicity as C++
> > does, there are some pointers and refereces that are not being used
> > correctly and need to be fixed.
> >
> > - Most of functions' arguments and return are referenced objects. There
> is
> > necessary to rethink which function argument and return need to be a
> > pointer
> > or a reference. I'm begginer with C++ and I need some advises about it.
> >
> > - To define which argument, return and function will be set as "const"
> or
> > not.
> >
> > - To define which function will be set as "virtual" or not.
> >
> > - To evaluate which and where to delete the allocated objects. I really
> > need
> > some advises, cause it's being difficult for me to see which is the best
> > to
> > delete these objects.
> >
> > Any volunteer to help with that I'm accepting ; ). But I think I can get
> > by
> > for while. However I'd like invite some volunteers to help me in the
> > implementation of these classes:
> >
> > - ResultSet, ResultSetMetaData, PreparedStatement and CallableStatement:
> > these classes belongs to the JDBC API and they are used a lot in DAS
> Java.
> > As known, the ODBC API is a procedural API and turns to be very
> difficult
> > to
> > use a procedural API in a OO application. There is no need to implement
> > these classes as complex as they are in JDBC, only what is really
> > necessary
> > for DAS C++.
> >
> > - DASObject: I initially created this class to set in place of the Java
> > Object class. The DAS Java has some functions that takes the Object
> class
> > as
> > arguments and as C++ has nothing like it(as far as I know) I created
> this
> > class. I've not assigned any function to this class(an empty class).
> Maybe
> > there is another simpler way to substitute the Java Object class,
> needing
> > some suggestions here too.
> >
> > I will sending right now to Luciano the DAS C++ project, then he may
> > upload
> > it in his sandbox as soon as possible.
> >
> > Adriano Crestani
> >
>
> Some of the issues you describe are common to SDO for C++ (and possiby SCA
> too - I'm not sufficiently familiar with the code there). I can describe
> what we did with SDO if that helps. I'm not sure if I'll have time to
> actually contribute very much but I'll see what I can do.
>
> More to follow.
>
> Geoff.
>
>
--
Pete
Re: DAS C++ needing volunteers and advises
Posted by Geoffrey Winn <ge...@googlemail.com>.
On 09/01/07, Adriano Crestani <ad...@gmail.com> wrote:
>
> Luciano Resende and me are developing the DAS C++. I started developing it
> translating the classes from DAS Java to DAS C++. I've already converted
> most of classes to C++, but the project is not compiling successfully yet
> and I think it will take some time to.
>
> There are many things to be done yet:
>
> - As I am not used to work with pointers and references explicity as C++
> does, there are some pointers and refereces that are not being used
> correctly and need to be fixed.
>
> - Most of functions' arguments and return are referenced objects. There is
> necessary to rethink which function argument and return need to be a
> pointer
> or a reference. I'm begginer with C++ and I need some advises about it.
>
> - To define which argument, return and function will be set as "const" or
> not.
>
> - To define which function will be set as "virtual" or not.
>
> - To evaluate which and where to delete the allocated objects. I really
> need
> some advises, cause it's being difficult for me to see which is the best
> to
> delete these objects.
>
> Any volunteer to help with that I'm accepting ; ). But I think I can get
> by
> for while. However I'd like invite some volunteers to help me in the
> implementation of these classes:
>
> - ResultSet, ResultSetMetaData, PreparedStatement and CallableStatement:
> these classes belongs to the JDBC API and they are used a lot in DAS Java.
> As known, the ODBC API is a procedural API and turns to be very difficult
> to
> use a procedural API in a OO application. There is no need to implement
> these classes as complex as they are in JDBC, only what is really
> necessary
> for DAS C++.
>
> - DASObject: I initially created this class to set in place of the Java
> Object class. The DAS Java has some functions that takes the Object class
> as
> arguments and as C++ has nothing like it(as far as I know) I created this
> class. I've not assigned any function to this class(an empty class). Maybe
> there is another simpler way to substitute the Java Object class, needing
> some suggestions here too.
>
> I will sending right now to Luciano the DAS C++ project, then he may
> upload
> it in his sandbox as soon as possible.
>
> Adriano Crestani
>
Some of the issues you describe are common to SDO for C++ (and possiby SCA
too - I'm not sufficiently familiar with the code there). I can describe
what we did with SDO if that helps. I'm not sure if I'll have time to
actually contribute very much but I'll see what I can do.
More to follow.
Geoff.