use base qw/SQL::Abstract::Limit/;
use strict;
use warnings;
-use Carp::Clan qw/^DBIx::Class/;
-use Scalar::Util();
+use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/;
+
+BEGIN {
+ # reinstall the carp()/croak() functions imported into SQL::Abstract
+ # as Carp and Carp::Clan do not like each other much
+ no warnings qw/redefine/;
+ no strict qw/refs/;
+ for my $f (qw/carp croak/) {
+
+ my $orig = \&{"SQL::Abstract::$f"};
+ *{"SQL::Abstract::$f"} = sub {
+
+ local $Carp::CarpLevel = 1; # even though Carp::Clan ignores this, $orig will not
+
+ if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) {
+ __PACKAGE__->can($f)->(@_);
+ }
+ else {
+ $orig->(@_);
+ }
+ }
+ }
+}
sub new {
my $self = shift->SUPER::new(@_);
return $self->SUPER::_where_field_BETWEEN ($lhs, $op, $rhs);
}
-
-
-# DB2 is the only remaining DB using this. Even though we are not sure if
-# RowNumberOver is still needed here (should be part of SQLA) leave the
-# code in place
+# Slow but ANSI standard Limit/Offset support. DB2 uses this
sub _RowNumberOver {
my ($self, $sql, $order, $rows, $offset ) = @_;
return $sql;
}
+# Crappy Top based Limit/Offset support. MSSQL uses this currently,
+# but may have to switch to RowNumberOver one day
+sub _Top {
+ my ( $self, $sql, $order, $rows, $offset ) = @_;
+
+ # mangle the input sql so it can be properly aliased in the outer queries
+ $sql =~ s/^ \s* SELECT \s+ (.+?) \s+ (?=FROM)//ix
+ or croak "Unrecognizable SELECT: $sql";
+ my $sql_select = $1;
+ my @sql_select = split (/\s*,\s*/, $sql_select);
+
+ # we can't support subqueries (in fact MSSQL can't) - croak
+ if (@sql_select != @{$self->{_dbic_rs_attrs}{select}}) {
+ croak (sprintf (
+ 'SQL SELECT did not parse cleanly - retrieved %d comma separated elements, while '
+ . 'the resultset select attribure contains %d elements: %s',
+ scalar @sql_select,
+ scalar @{$self->{_dbic_rs_attrs}{select}},
+ $sql_select,
+ ));
+ }
+
+ my $name_sep = $self->name_sep || '.';
+ $name_sep = "\Q$name_sep\E";
+ my $col_re = qr/ ^ (?: (.+) $name_sep )? ([^$name_sep]+) $ /x;
+
+ # construct the new select lists, rename(alias) some columns if necessary
+ my (@outer_select, @inner_select, %seen_names, %col_aliases, %outer_col_aliases);
+
+ for (@{$self->{_dbic_rs_attrs}{select}}) {
+ next if ref $_;
+ my ($table, $orig_colname) = ( $_ =~ $col_re );
+ next unless $table;
+ $seen_names{$orig_colname}++;
+ }
+
+ for my $i (0 .. $#sql_select) {
+
+ my $colsel_arg = $self->{_dbic_rs_attrs}{select}[$i];
+ my $colsel_sql = $sql_select[$i];
+
+ # this may or may not work (in case of a scalarref or something)
+ my ($table, $orig_colname) = ( $colsel_arg =~ $col_re );
+
+ my $quoted_alias;
+ # do not attempt to understand non-scalar selects - alias numerically
+ if (ref $colsel_arg) {
+ $quoted_alias = $self->_quote ('column_' . (@inner_select + 1) );
+ }
+ # column name seen more than once - alias it
+ elsif ($orig_colname && ($seen_names{$orig_colname} > 1) ) {
+ $quoted_alias = $self->_quote ("${table}__${orig_colname}");
+ }
+
+ # we did rename - make a record and adjust
+ if ($quoted_alias) {
+ # alias inner
+ push @inner_select, "$colsel_sql AS $quoted_alias";
+
+ # push alias to outer
+ push @outer_select, $quoted_alias;
+
+ # Any aliasing accumulated here will be considered
+ # both for inner and outer adjustments of ORDER BY
+ $self->__record_alias (
+ \%col_aliases,
+ $quoted_alias,
+ $colsel_arg,
+ $table ? $orig_colname : undef,
+ );
+ }
+
+ # otherwise just leave things intact inside, and use the abbreviated one outside
+ # (as we do not have table names anymore)
+ else {
+ push @inner_select, $colsel_sql;
+
+ my $outer_quoted = $self->_quote ($orig_colname); # it was not a duplicate so should just work
+ push @outer_select, $outer_quoted;
+ $self->__record_alias (
+ \%outer_col_aliases,
+ $outer_quoted,
+ $colsel_arg,
+ $table ? $orig_colname : undef,
+ );
+ }
+ }
+
+ my $outer_select = join (', ', @outer_select );
+ my $inner_select = join (', ', @inner_select );
+
+ %outer_col_aliases = (%outer_col_aliases, %col_aliases);
+
+ # deal with order
+ croak '$order supplied to SQLAHacks limit emulators must be a hash'
+ if (ref $order ne 'HASH');
+
+ $order = { %$order }; #copy
+
+ my $req_order = $order->{order_by};
+ my $limit_order =
+ scalar $self->_order_by_chunks ($req_order) # examine normalized version, collapses nesting
+ ? $req_order
+ : $order->{_virtual_order_by}
+ ;
+
+ my ( $order_by_inner, $order_by_outer ) = $self->_order_directions($limit_order);
+ my $order_by_requested = $self->_order_by ($req_order);
+
+ # generate the rest
+ delete $order->{$_} for qw/order_by _virtual_order_by/;
+ my $grpby_having = $self->_order_by ($order);
+
+ # short circuit for counts - the ordering complexity is needless
+ if ($self->{_dbic_rs_attrs}{-for_count_only}) {
+ return "SELECT TOP $rows $inner_select $sql $grpby_having $order_by_outer";
+ }
+
+ # we can't really adjust the order_by columns, as introspection is lacking
+ # resort to simple substitution
+ for my $col (keys %outer_col_aliases) {
+ for ($order_by_requested, $order_by_outer) {
+ $_ =~ s/\s+$col\s+/ $outer_col_aliases{$col} /g;
+ }
+ }
+ for my $col (keys %col_aliases) {
+ $order_by_inner =~ s/\s+$col\s+/$col_aliases{$col}/g;
+ }
+
+
+ my $inner_lim = $rows + $offset;
+
+ $sql = "SELECT TOP $inner_lim $inner_select $sql $grpby_having $order_by_inner";
+
+ if ($offset) {
+ $sql = <<"SQL";
+
+ SELECT TOP $rows $outer_select FROM
+ (
+ $sql
+ ) AS me
+ $order_by_outer
+SQL
+
+ }
+
+ if ($order_by_requested) {
+ $sql = <<"SQL";
+
+ SELECT $outer_select FROM
+ ( $sql ) AS me
+ $order_by_requested;
+SQL
+
+ }
+
+ return $sql;
+}
+
+# action at a distance to shorten Top code above
+sub __record_alias {
+ my ($self, $register, $alias, $fqcol, $col) = @_;
+
+ # record qualified name
+ $register->{$fqcol} = $alias;
+ $register->{$self->_quote($fqcol)} = $alias;
+
+ return unless $col;
+
+ # record unqialified name, undef (no adjustment) if a duplicate is found
+ if (exists $register->{$col}) {
+ $register->{$col} = undef;
+ }
+ else {
+ $register->{$col} = $alias;
+ }
+
+ $register->{$self->_quote($col)} = $register->{$col};
+}
+
+
# While we're at it, this should make LIMIT queries more efficient,
# without digging into things too deeply
return $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax);
}
+my $for_syntax = {
+ update => 'FOR UPDATE',
+ shared => 'FOR SHARE',
+};
sub select {
my ($self, $table, $fields, $where, $order, @rest) = @_;
- local $self->{having_bind} = [];
- local $self->{from_bind} = [];
+
+ $self->{"${_}_bind"} = [] for (qw/having from order/);
if (ref $table eq 'SCALAR') {
$table = $$table;
my ($sql, @where_bind) = $self->SUPER::select(
$table, $self->_recurse_fields($fields), $where, $order, @rest
);
- $sql .=
- $self->{for} ?
- (
- $self->{for} eq 'update' ? ' FOR UPDATE' :
- $self->{for} eq 'shared' ? ' FOR SHARE' :
- ''
- ) :
- ''
- ;
- return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}) : $sql;
+ if (my $for = delete $self->{_dbic_rs_attrs}{for}) {
+ $sql .= " $for_syntax->{$for}" if $for_syntax->{$for};
+ }
+
+ return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}, @{$self->{order_bind}} ) : $sql;
}
sub insert {
my $self = shift;
my $table = shift;
$table = $self->_quote($table) unless ref($table);
+
+ # SQLA will emit INSERT INTO $table ( ) VALUES ( )
+ # which is sadly understood only by MySQL. Change default behavior here,
+ # until SQLA2 comes with proper dialect support
+ if (! $_[0] or (ref $_[0] eq 'HASH' and !keys %{$_[0]} ) ) {
+ return "INSERT INTO ${table} DEFAULT VALUES"
+ }
+
$self->SUPER::insert($table, @_);
}
}
sub _order_by {
- my $self = shift;
- my $ret = '';
- my @extra;
- if (ref $_[0] eq 'HASH') {
- if (defined $_[0]->{group_by}) {
+ my ($self, $arg) = @_;
+
+ if (ref $arg eq 'HASH' and keys %$arg and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) {
+
+ my $ret = '';
+
+ if (defined $arg->{group_by}) {
$ret = $self->_sqlcase(' group by ')
- .$self->_recurse_fields($_[0]->{group_by}, { no_rownum_hack => 1 });
+ .$self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 });
}
- if (defined $_[0]->{having}) {
- my $frag;
- ($frag, @extra) = $self->_recurse_where($_[0]->{having});
- push(@{$self->{having_bind}}, @extra);
+
+ if (defined $arg->{having}) {
+ my ($frag, @bind) = $self->_recurse_where($arg->{having});
+ push(@{$self->{having_bind}}, @bind);
$ret .= $self->_sqlcase(' having ').$frag;
}
- if (defined $_[0]->{order_by}) {
- $ret .= $self->_order_by($_[0]->{order_by});
- }
- if (grep { $_ =~ /^-(desc|asc)/i } keys %{$_[0]}) {
- return $self->SUPER::_order_by($_[0]);
- }
- } elsif (ref $_[0] eq 'SCALAR') {
- $ret = $self->_sqlcase(' order by ').${ $_[0] };
- } elsif (ref $_[0] eq 'ARRAY' && @{$_[0]}) {
- my @order = @{+shift};
- $ret = $self->_sqlcase(' order by ')
- .join(', ', map {
- my $r = $self->_order_by($_, @_);
- $r =~ s/^ ?ORDER BY //i;
- $r;
- } @order);
- } else {
- $ret = $self->SUPER::_order_by(@_);
- }
- return $ret;
-}
-sub _order_directions {
- my ($self, $order) = @_;
- return $self->SUPER::_order_directions( $self->_resolve_order($order) );
-}
-
-sub _resolve_order {
- my ($self, $order) = @_;
- $order = $order->{order_by} if (ref $order eq 'HASH' and $order->{order_by});
+ if (defined $arg->{order_by}) {
+ my ($frag, @bind) = $self->SUPER::_order_by($arg->{order_by});
+ push(@{$self->{order_bind}}, @bind);
+ $ret .= $frag;
+ }
- if (ref $order eq 'HASH') {
- $order = [$self->_resolve_order_hash($order)];
+ return $ret;
}
- elsif (ref $order eq 'ARRAY') {
- $order = [map {
- if (ref ($_) eq 'SCALAR') {
- $$_
- }
- elsif (ref ($_) eq 'HASH') {
- $self->_resolve_order_hash($_)
- }
- else {
- $_
- }
- } @$order];
+ else {
+ my ($sql, @bind) = $self->SUPER::_order_by ($arg);
+ push(@{$self->{order_bind}}, @bind);
+ return $sql;
}
-
- return $order;
}
-sub _resolve_order_hash {
+sub _order_directions {
my ($self, $order) = @_;
- my @new_order;
- foreach my $key (keys %{ $order }) {
- if ($key =~ /^-(desc|asc)/i ) {
- my $direction = $1;
- my $type = ref $order->{ $key };
- if ($type eq 'ARRAY') {
- push @new_order, map( "$_ $direction", @{ $order->{ $key } } );
- } elsif (!$type) {
- push @new_order, "$order->{$key} $direction";
- } else {
- croak "hash order_by can only contain Scalar or Array, not $type";
- }
- } else {
- croak "$key is not a valid direction, use -asc or -desc";
- }
- }
- return @new_order;
+
+ # strip bind values - none of the current _order_directions users support them
+ return $self->SUPER::_order_directions( [ map
+ { ref $_ ? $_->[0] : $_ }
+ $self->_order_by_chunks ($order)
+ ]);
}
sub _table {
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