Sqlite c++ ATTACH memory database - c++

Question

I try to attach in memory db to an existing db connection via c++ api like this:
void InMemoryDbtest(){
sqlite3 *db;
int rc = sqlite3_open("E:/VS_workspace/ConsoleSQLITE/Debug/TPCH.sqlite", &db);
if (rc){
cout << "nie moge otworzyc bazy danych ";}
else{
cout << "otwarcie bazy ---- udalo sie\n";}
char *err;
sqlite3_exec(db, "ATTACH DATABASE 'file::memory:?cache=shared' as pom",0,0,&err);
cout << "error" << err << endl;
string q = "create table pom.bla as select n_name from NATION ";
sqlite3_exec(db, q.c_str(), 0, 0, &err);
cout << "error" << err << endl;
}
I get 2 error messages"
unable to open database: file:memory
and
unknown database pom
Any ideas? When i try to attach db in sqlite console everything works just fine

Answer 1

Thank you for your suggestions the solution is:
first : set SQLITE_USE_URI flag in sqlite3.c to 1 instead of 0 (just using SQLITE_OPEN_URI flag with sqlite3_open_v2() wsn't enough)
#ifndef SQLITE_USE_URI
# define SQLITE_USE_URI 1
#endif
then you can use uri's with all sqlite3 functions.
proper uri for windows is:
int rc2 = sqlite3_open("file:///E:/VS_workspace/ConsoleSQLITE/Debug/TPCH.sqlite", &db);