void DB_Set::insert_cmd_interpret(token& t, vector<Table*> r)
{
string name = t[0].get_value();
Table* ptr = lookup(name);
if(ptr != nullptr)
{
if(t[1].get_type() == expr)
{
Table* e = expr_interpret(t[1], r);
if(e != nullptr) DB_Engine::insert_relation(ptr, *e);
}
else if(t[1].get_type() == insert_list)
{
token* itr = &(t[1]);
Tuple tup = ptr->get_Template_Tuple();
vector<Attribute> attrs = tup.get_Attributes();
int i = 0;
while((*itr).get_type() == insert_list)
{
if(attrs[i].get_Length() == -1) attrs[i].set_Int_Value(stoi((*itr)[0][0].get_value()));
else if(attrs[i].get_Length() != -1) attrs[i].set_String_Value((*itr)[0][0].get_value());
itr = &((*itr)[1]);
++i;
}
Tuple new_tup(attrs);
DB_Engine::insert_tuple(ptr, attrs);
}
}
else cout<<"No table found\n";
}
void DB_Set::query_interpret(token& t, vector<Table*> r)
{
Table* e = expr_interpret(t[1], r);
if(e != nullptr)
{
e->set_Name(t[0].get_value());
tables.push_back(e);
}
}
int main(int argc, char* argv[]) {
if(argc !=2 ) {
fprintf(stderr,"usage: expr-parser FILE\n");
exit(1);
}
Expr* expr = expr_parse(argv[1]);
printf("expr = ");
expr_print(expr);
printf("\n%d\n", expr_interpret(expr));
}
Table* DB_Set::atomic_expr_interpret(token& t, vector<Table*> r)
{
if(t[0].get_type() == identifier) return (lookup(t[0].get_value()));
else if(t[0].get_type() == expr) return (expr_interpret(t[0], r));
else return nullptr;
}