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-rw-r--r--Bugzilla/DB.pm13
1 files changed, 11 insertions, 2 deletions
diff --git a/Bugzilla/DB.pm b/Bugzilla/DB.pm
index 095ba27a6..098a9414c 100644
--- a/Bugzilla/DB.pm
+++ b/Bugzilla/DB.pm
@@ -50,6 +50,7 @@ use Storable qw(dclone);
#####################################################################
use constant BLOB_TYPE => DBI::SQL_BLOB;
+use constant ISOLATION_LEVEL => 'REPEATABLE READ';
# Set default values for what used to be the enum types. These values
# are no longer stored in localconfig. If we are upgrading from a
@@ -876,7 +877,7 @@ sub bz_start_transaction {
# what we need in Bugzilla to be safe, for what we do.
# Different DBs have different defaults for their isolation
# level, so we just set it here manually.
- $self->do('SET TRANSACTION ISOLATION LEVEL REPEATABLE READ');
+ $self->do('SET TRANSACTION ISOLATION LEVEL ' . $self->ISOLATION_LEVEL);
$self->{private_bz_transaction_count} = 1;
}
}
@@ -1198,13 +1199,21 @@ should be always preffered over hard-coding SQL commands.
Subclasses of Bugzilla::DB are required to define certain constants. These
constants are required to be subroutines or "use constant" variables.
-=over 4
+=over
=item C<BLOB_TYPE>
The C<\%attr> argument that must be passed to bind_param in order to
correctly escape a C<LONGBLOB> type.
+=item C<ISOLATION_LEVEL>
+
+The argument that this database should send to
+C<SET TRANSACTION ISOLATION LEVEL> when starting a transaction. If you
+override this in a subclass, the isolation level you choose should
+be as strict as or more strict than the default isolation level defined in
+L<Bugzilla::DB>.
+
=back