OK, thanks Pete, but how do I alloc memory with new? I will search for it.
Adriano Crestani
On 3/15/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
I'm not sure what is going on but using malloc in C++ is not a good idea.
You are mixing 2 different memory management systems. You could try using
the C++ new to allocate memory for the sqlPtr. You are also allocating
memory with malloc that is never freed.
I can't recreate this with adding Properties with strings so I suspect
that
there is something odd in the malloc/char*/string handling.
Cheers,
On 14/03/07, Adriano Crestani <[EMAIL PROTECTED]> wrote:
>
> Hey,
>
> Now I was checking if the properties were correctly added to the type
and
> I
> got something strange:
>
> dataFactory->addPropertyToType(myType, *(new
> std::string(getColumnName(statement, 1)), intType);
> dataFactory->addPropertyToType(myType, *(new
> std::string(getColumnName(statement, 2)), intType);
>
> // on my test the column names returned by the getColumnName function
are
> respectively "ID" and "DESCR"
>
> ...
>
> //then I checked if the properties were correctly added with this loop:
>
> int m;
> commonj::sdo::PropertyList list = myType.getProperties();
> for (m = 0 ; m < list.size() ; m++) {
> std::cout << list[m].getName() << "\n";
> }
>
>
> The output should be:
>
> ID
> DESCR
>
> But it's outputting:
>
> ====ID
> ====DESCR
>
> I don't know from where this four "=" are coming from, cause I already
> have
> checked with a debugger and the strings "ID" and "DESCR" are being added
> and
> there is no '=' ('\205' as shown on the debugger) character in it.
>
> Is this a bug?
>
> Adriano Crestani
>
> //as I've already said I'm adding the properties this way:
>
> On 3/14/07, Adriano Crestani <[EMAIL PROTECTED]> wrote:
> >
> > I created a new type on a DataFactory, for example
> >
> > ...
> > dataFactory->addType("MyNameSpace", "MyRoot");
> > const Type& myType = dataFactory->getType("MyNameSpace", "MyRoot");
> > const Type& intType = dataFactory->getType("commonj.sdo", "Integer");
> >
> > //then I try to add some integer properties to this type
> >
> > dataFactory->addPropertyToType(myType, getColumnName(statement, 1),
> > intType);
> > std::cout << "Properties count = " << myType.getProperties().size() <<
> > "\n";
> >
> > dataFactory->addPropertyToType(myType, getColumnName(statement, 2),
> > intType);
> > std::cout << "Properties count = " << myType.getProperties().size() <<
> > "\n";
> >
> > ...
> > }
> >
> > //where getColumnName function is defined as:
> >
> > std::string getColumnName(HSTMT statement, int column) {
> > SQLPOINTER sqlPtr = 0;
> > char strAux[1];
> > SQLSMALLINT length = 0;
> > SQLColAttributeA(statement, column, SQL_DESC_BASE_COLUMN_NAME,
> > &strAux, 1, (SQLSMALLINT*) &length, NULL); //get the string length
> > length++;
> > sqlPtr = (char*) malloc(length*sizeof(char)); //alloc the enough
> > memory to place the string characters
> > SQLColAttributeA(statement, column, SQL_DESC_BASE_COLUMN_NAME,
> sqlPtr,
> > length, (SQLSMALLINT*) &length, NULL); //get the string from the db
> >
> > std::string ret = (char*) sqlPtr; //create a new string object
from
> a
> > char pointer
> > return ret;
> >
> > }
> >
> >
> > Unfortunately the output is:
> >
> > Properties count = 1
> > Properties count = 1
> >
> > instead of
> >
> > Properties count = 1
> > Properties count = 2
> >
> > I've checked if the function getColumnName isn't returning strings
with
> > the same value, but it is not, they are different strings!!
> >
> > Though I tried an strange approach and it's solving the problem for
> while,
> > that is to instantiate a new string on memory:
> >
> > dataFactory->addPropertyToType(myType, *(new
> > std::string(getColumnName(statement, 1)), intType);
> > dataFactory->addPropertyToType(myType, *(new
> > std::string(getColumnName(statement, 2)), intType);
> >
> > Can anybody tell why it's happening?
> >
> > Adriano Crestani
> >
>
--
Pete
