Moved written table timestamping from query_start() to query_end():
We are adjusting table last written times at the end of transaction.
That does not apply to immediate database writes that are not performed
within transaction. This change is to set last written time after the query
has finished for such writes, rather than before it started. That way
long write operations cannot spill over the latency parameter.
moodle_read_slave_trait: when creating another handle, restore temptables
property that is clobbered by raw_connect().
Also a better condition for temptable related queries detection in
pgsql_native_moodle_database.
dml_pgsql_read_slave_test::test_temp_table(): use real db connection
if possible, otherwise skip the test.
1. pg_connection_status(false) fails on PHP8 because the argument is not a stream
2. skipeed the unittest that expected that pg_query() does not show an error if the resource is invalid
see also MDL-71482
Implemented with moodle_read_slave_trait
Functionality is triggered by supplying config dboption['readonly'].
See config-dist.php for more info on supported dboptions.
pgsql and mysqli drivers are using this feature. Also added support for
connection timeout for these two drivers.
Srdjan