QOCIDriver: optimize string handling in tables()

- Instead of a QStringList, use a const char 2D array
  to hold the system user names. Don't remove the
  current user from that list, skip it duing processing.
- Extract Method make_where_clause, optimize it and
  cache its result. Instead of creating a QStringList
  and join()ing it at the end (sometimes twice), append
  to the result QString directly. Reserve the max size
  of the result string, which is statically known.
- Keep the query select statements in QLatin1String.
  They are only used in QStringBuilder expressions.

Change-Id: I0593d2812da671a541d49a6136f3ff3d784c63d5
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

0 files changed, 0 insertions, 0 deletions