When the table for a selected column can't be determined (e.g. because
there is no table for it), PQftable returns InvalidOid. This was not
covered and a query to determine the table name was executed every
time which slowed down calls to QSqlQuery::value(QString).
Task-number: QTBUG-65226
Change-Id: Idd8fbaaef7b01ca4151439f46cad2cce6f1c93e9
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
In order to save having to always run a query to get the tablename for
a known oid then we cache the result on the driver side. The oid stays
the same while the table exists, so only on dropping it would it change.
Recreating the table causes it to get a new oid, so there is no risk of
the old one being associated with the wrong table when this happens, if
the driver is still open at that point.
The benchmark added shows the improvement from the previous code, before
the results for PostgreSQL was:
RESULT : tst_QSqlRecord::benchmarkRecord():"0_QPSQL@localhost":
259 msecs per iteration (total: 259, iterations: 1)
whereas now it is:
RESULT : tst_QSqlRecord::benchmarkRecord():"0_QPSQL@localhost":
0.000014 msecs per iteration (total: 59, iterations: 4194304)
Task-number: QTBUG-65226
Change-Id: Ic290cff719102743da84e2044cd23e540f20c96c
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Reviewed-by: Robert Szefner <robertsz27@interia.pl>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Alexandru Croitor
Leander Beernaert
Christian Ehrlicher
Andy Shaw