[Cppcms-users] cppdb::statement copy and assign

[CN <cn...@fa...>]

Hi!

I recently made a mistake by doing this:

cppdb::statement create(){
  cppdb::session se("connect parameters");
  cppdb::statement  st=se << "SELECT * FROM t";
  return st;
}

void use(){
  cppdb::statement  st=create();
  st.query();
}

Very weird errors happens to st.query().
It took me quite some time to pin point the bug. After that, I re-read
the comments in cppdb/cppdb/frontend.h and I believe they confirm my
conclusion:

The problem here, I believe, is that cppdb::statement object is already
destroyed before st.query() is executed.

I am writing this note here in order to remind myself of avoiding such
practice. Hopefully no one else will make the same mistake as I did!

Meanwhile, I suspect it will be better off

(a) either to remove the cppdb::statement copy and assignment methods
from cppdb source altogether
(b) or to make cppdb::statement non-copyable

I have a feeling that these two methods serve only as a trap.
Yes? No?

Best Regards,
CN

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