use List::Util();
+__PACKAGE__->mk_group_accessors(simple => qw/
+ _identity _identity_method
+/);
+
__PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks::MSSQL');
+sub _set_identity_insert {
+ my ($self, $table) = @_;
+
+ my $sql = sprintf (
+ 'SET IDENTITY_INSERT %s ON',
+ $self->sql_maker->_quote ($table),
+ );
+
+ my $dbh = $self->_get_dbh;
+ eval { $dbh->do ($sql) };
+ if ($@) {
+ $self->throw_exception (sprintf "Error executing '%s': %s",
+ $sql,
+ $dbh->errstr,
+ );
+ }
+}
+
+sub _unset_identity_insert {
+ my ($self, $table) = @_;
+
+ my $sql = sprintf (
+ 'SET IDENTITY_INSERT %s OFF',
+ $self->sql_maker->_quote ($table),
+ );
+
+ my $dbh = $self->_get_dbh;
+ $dbh->do ($sql);
+}
+
sub insert_bulk {
my $self = shift;
my ($source, $cols, $data) = @_;
- my $identity_insert = 0;
+ my $is_identity_insert = (List::Util::first
+ { $source->column_info ($_)->{is_auto_increment} }
+ (@{$cols})
+ )
+ ? 1
+ : 0;
- COLUMNS:
- foreach my $col (@{$cols}) {
- if ($source->column_info($col)->{is_auto_increment}) {
- $identity_insert = 1;
- last COLUMNS;
- }
+ if ($is_identity_insert) {
+ $self->_set_identity_insert ($source->name);
}
- if ($identity_insert) {
- my $table = $source->from;
- $self->dbh->do("SET IDENTITY_INSERT $table ON");
+ $self->next::method(@_);
+
+ if ($is_identity_insert) {
+ $self->_unset_identity_insert ($source->name);
}
+}
- $self->next::method(@_);
+# support MSSQL GUID column types
+
+sub insert {
+ my $self = shift;
+ my ($source, $to_insert) = @_;
+
+ my $supplied_col_info = $self->_resolve_column_info($source, [keys %$to_insert] );
+
+ my %guid_cols;
+ my @pk_cols = $source->primary_columns;
+ my %pk_cols;
+ @pk_cols{@pk_cols} = ();
- if ($identity_insert) {
- my $table = $source->from;
- $self->dbh->do("SET IDENTITY_INSERT $table OFF");
+ my @pk_guids = grep {
+ $source->column_info($_)->{data_type}
+ &&
+ $source->column_info($_)->{data_type} =~ /^uniqueidentifier/i
+ } @pk_cols;
+
+ my @auto_guids = grep {
+ $source->column_info($_)->{data_type}
+ &&
+ $source->column_info($_)->{data_type} =~ /^uniqueidentifier/i
+ &&
+ $source->column_info($_)->{auto_nextval}
+ } grep { not exists $pk_cols{$_} } $source->columns;
+
+ my @get_guids_for =
+ grep { not exists $to_insert->{$_} } (@pk_guids, @auto_guids);
+
+ my $updated_cols = {};
+
+ for my $guid_col (@get_guids_for) {
+ my ($new_guid) = $self->_get_dbh->selectrow_array('SELECT NEWID()');
+ $updated_cols->{$guid_col} = $to_insert->{$guid_col} = $new_guid;
}
+
+ my $is_identity_insert = (List::Util::first { $_->{is_auto_increment} } (values %$supplied_col_info) )
+ ? 1
+ : 0;
+
+ if ($is_identity_insert) {
+ $self->_set_identity_insert ($source->name);
+ }
+
+ $updated_cols = { %$updated_cols, %{ $self->next::method(@_) } };
+
+ if ($is_identity_insert) {
+ $self->_unset_identity_insert ($source->name);
+ }
+
+
+ return $updated_cols;
}
sub _prep_for_execute {
# cast MONEY values properly
if ($op eq 'insert' || $op eq 'update') {
my $fields = $args->[0];
- my $col_info = $self->_resolve_column_info($ident, [keys %$fields]);
for my $col (keys %$fields) {
- if ($col_info->{$col}{data_type} =~ /^money\z/i) {
+ # $ident is a result source object with INSERT/UPDATE ops
+ if ($ident->column_info ($col)->{data_type}
+ &&
+ $ident->column_info ($col)->{data_type} =~ /^money\z/i) {
my $val = $fields->{$col};
$fields->{$col} = \['CAST(? AS MONEY)', [ $col => $val ]];
}
if ($op eq 'insert') {
$sql .= ';SELECT SCOPE_IDENTITY()';
- my $col_info = $self->_resolve_column_info($ident, [map $_->[0], @{$bind}]);
- if (List::Util::first { $_->{is_auto_increment} } (values %$col_info) ) {
-
- my $table = $ident->from;
- my $identity_insert_on = "SET IDENTITY_INSERT $table ON";
- my $identity_insert_off = "SET IDENTITY_INSERT $table OFF";
- $sql = "$identity_insert_on; $sql; $identity_insert_off";
- }
}
return ($sql, $bind);
my ($op) = @_;
my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
+
if ($op eq 'insert') {
- $self->{_scope_identity} = $sth->fetchrow_array;
+
+ # this should bring back the result of SELECT SCOPE_IDENTITY() we tacked
+ # on in _prep_for_execute above
+ my ($identity) = eval { $sth->fetchrow_array };
+
+ # SCOPE_IDENTITY failed, but we can do something else
+ if ( (! $identity) && $self->_identity_method) {
+ ($identity) = $self->_dbh->selectrow_array(
+ 'select ' . $self->_identity_method
+ );
+ }
+
+ $self->_identity($identity);
$sth->finish;
}
return wantarray ? ($rv, $sth, @bind) : $rv;
}
+sub last_insert_id { shift->_identity }
+
+#
+# MSSQL is retarded wrt ordered subselects. One needs to add a TOP
+# to *all* subqueries, but one also can't use TOP 100 PERCENT
+# http://sqladvice.com/forums/permalink/18496/22931/ShowThread.aspx#22931
+#
+sub _select_args_to_query {
+ my $self = shift;
+
+ my ($sql, $prep_bind, @rest) = $self->next::method (@_);
+
+ # see if this is an ordered subquery
+ my $attrs = $_[3];
+ if ( scalar $self->sql_maker->_order_by_chunks ($attrs->{order_by}) ) {
+ my $max = 2 ** 32;
+ $sql =~ s/^ \s* SELECT \s/SELECT TOP $max /xi;
+ }
+
+ return wantarray
+ ? ($sql, $prep_bind, @rest)
+ : \[ "($sql)", @$prep_bind ]
+ ;
+}
-sub last_insert_id { shift->{_scope_identity} }
+
+# savepoint syntax is the same as in Sybase ASE
+
+sub _svp_begin {
+ my ($self, $name) = @_;
+
+ $self->_get_dbh->do("SAVE TRANSACTION $name");
+}
+
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
+
+sub _svp_rollback {
+ my ($self, $name) = @_;
+
+ $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
+}
sub build_datetime_parser {
my $self = shift;
sub sqlt_type { 'SQLServer' }
-sub _sql_maker_opts {
- my ( $self, $opts ) = @_;
+sub _get_mssql_version {
+ my $self = shift;
+
+ my $data = $self->_get_dbh->selectrow_hashref('xp_msver ProductVersion');
- if ( $opts ) {
- $self->{_sql_maker_opts} = { %$opts };
+ if ($data->{Character_Value} =~ /^(\d+)\./) {
+ return $1;
+ } else {
+ $self->throw_exception(q{Your ProductVersion's Character_Value is missing or malformed!});
}
+}
+
+sub sql_maker {
+ my $self = shift;
- return { limit_dialect => 'Top', %{$self->{_sql_maker_opts}||{}} };
+ unless ($self->_sql_maker) {
+ unless ($self->{_sql_maker_opts}{limit_dialect}) {
+ my $version = eval { $self->_get_mssql_version; } || 0;
+
+ $self->{_sql_maker_opts} = {
+ limit_dialect => ($version >= 9 ? 'RowNumberOver' : 'Top'),
+ %{$self->{_sql_maker_opts}||{}}
+ };
+ }
+
+ my $maker = $self->next::method (@_);
+ }
+
+ return $self->_sql_maker;
}
1;
=head1 IMPLEMENTATION NOTES
+=head2 IDENTITY information
+
Microsoft SQL Server supports three methods of retrieving the IDENTITY
value for inserted row: IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY().
SCOPE_IDENTITY is used here because it is the safest. However, it must
So, this implementation appends a SELECT SCOPE_IDENTITY() statement
onto each INSERT to accommodate that requirement.
+C<SELECT @@IDENTITY> can also be used by issuing:
+
+ $self->_identity_method('@@identity');
+
+it will only be used if SCOPE_IDENTITY() fails.
+
+This is more dangerous, as inserting into a table with an on insert trigger that
+inserts into another table with an identity will give erroneous results on
+recent versions of SQL Server.
+
+=head2 identity insert
+
+Be aware that we have tried to make things as simple as possible for our users.
+For MSSQL that means that when a user tries to create a row, while supplying an
+explicit value for an autoincrementing column, we will try to issue the
+appropriate database call to make this possible, namely C<SET IDENTITY_INSERT
+$table_name ON>. Unfortunately this operation in MSSQL requires the
+C<db_ddladmin> privilege, which is normally not included in the standard
+write-permissions.
+
=head1 AUTHOR
See L<DBIx::Class/CONTRIBUTORS>.