Re: [INTERFACES] libpq++ and arrays?

Alf Lewerken wrote:
>
> I have the following problem:
> I'm using libpq++ to acces a Postgres-Database.
>
> The table was created in psql using:
> create table test values (nr int4, some_value float4[]);
...
> // so how do I obtain values in some_value[1], some_value[2] .... ?

How about

create table test (nr int4, some_value float4[]);
insert into test values (1,'{1,2,3}');
insert into test values (2,'{2,4,6}');
insert into test values (3,'{3,6,9}');

#include <iostream>
#include <libpq++.h>

int main()
{
const char *nr_string, *val1, *val2;

PgDatabase test("test");
test.Exec("select nr,test.some_value[1] as val1, test.some_value[2] as val2 "
"from test");

for(int i=0; i<test.Tuples();i++)
{
nr_string = test.GetValue(i, "nr");
val1 = test.GetValue(i, "val1");
val2 = test.GetValue(i, "val2");
cout<<"nr_string: "<<nr_string
<<"\nsome_value[1]: "<<val1
<<"\nsome_value[2]: "<<val2<<'\n';
}

return 0;
}

% a.out
nr_string: 1
some_value[1]: 1
some_value[2]: 2
nr_string: 2
some_value[1]: 2
some_value[2]: 4
nr_string: 3
some_value[1]: 3
some_value[2]: 6

Add cursors to taste :)

Cheers,

Patrick