use strict;
use warnings;
use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/;
+use Sub::Name();
BEGIN {
# reinstall the carp()/croak() functions imported into SQL::Abstract
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 {
- $orig->(@_);
- }
- }
+ *{"SQL::Abstract::$f"} = Sub::Name::subname "SQL::Abstract::$f" =>
+ sub {
+ if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) {
+ __PACKAGE__->can($f)->(@_);
+ }
+ else {
+ goto $orig;
+ }
+ };
}
}
$self;
}
-# Some databases (sqlite) do not handle multiple parenthesis
-# around in/between arguments. A tentative x IN ( (1, 2 ,3) )
-# is interpreted as x IN 1 or something similar.
-#
-# Since we currently do not have access to the SQLA AST, resort
-# to barbaric mutilation of any SQL supplied in literal form
-sub _strip_outer_paren {
- my ($self, $arg) = @_;
-
- return $self->_SWITCH_refkind ($arg, {
- ARRAYREFREF => sub {
- $$arg->[0] = __strip_outer_paren ($$arg->[0]);
- return $arg;
- },
- SCALARREF => sub {
- return \__strip_outer_paren( $$arg );
- },
- FALLBACK => sub {
- return $arg
- },
- });
-}
+# generate inner/outer select lists for various limit dialects
+# which result in one or more subqueries (e.g. RNO, Top, RowNum)
+# Any non-root-table columns need to have their table qualifier
+# turned into a column name (otherwise names in subqueries clash
+# and/or lose their source table)
+sub _subqueried_selection {
+ my ($self, $rs_attrs) = @_;
+
+ croak 'Limit usable only in the context of DBIC (missing $rs_attrs)' unless $rs_attrs;
+
+ # correlate select and as
+ my @sel;
+ for my $i (0 .. $#{$rs_attrs->{select}}) {
+ my $s = $rs_attrs->{select}[$i];
+ push @sel, {
+ sql => $self->_recurse_fields ($s),
+ unquoted_sql => do { local $self->{quote_char}; $self->_recurse_fields ($s) },
+ as =>
+ ( (ref $s) eq 'HASH' ? $s->{-as} : undef)
+ ||
+ $rs_attrs->{as}[$i]
+ ||
+ croak "Select argument $i ($s) without corresponding 'as'"
+ ,
+ };
+ }
-sub __strip_outer_paren {
- my $sql = shift;
+ my ($qsep, $qalias) = map { quotemeta $_ } (
+ $self->name_sep || '.',
+ $rs_attrs->{alias},
+ );
- if ($sql and not ref $sql) {
- while ($sql =~ /^ \s* \( (.*) \) \s* $/x ) {
- $sql = $1;
+ # re-alias and remove any name separators from aliases,
+ # unless we are dealing with the current source alias
+ # (which will transcend the subqueries and is necessary
+ # for possible further chaining)
+ my (@insel, @outsel);
+ for my $node (@sel) {
+ if (List::Util::first { $_ =~ / (?<! $qalias ) $qsep /x } ($node->{as}, $node->{unquoted_sql}) ) {
+ $node->{as} =~ s/ $qsep /__/xg;
+ push @insel, sprintf '%s AS %s', $node->{sql}, $self->_quote($node->{as});
+ push @outsel, $self->_quote ($node->{as});
+ }
+ else {
+ push @insel, $node->{sql};
+ push @outsel, $self->_quote ($node->{as});
}
}
+ return map { join (', ', @$_ ) } (\@insel, \@outsel);
+}
+
+
+# ANSI standard Limit/Offset implementation. DB2 and MSSQL use this
+sub _RowNumberOver {
+ my ($self, $sql, $rs_attrs, $rows, $offset ) = @_;
+
+ # mangle the input sql as we will be replacing the selector
+ $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//ix
+ or croak "Unrecognizable SELECT: $sql";
+
+ # get selectors
+ my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs);
+
+ # make up an order if none exists
+ my $order_by = $self->_order_by(
+ (delete $rs_attrs->{order_by}) || $self->_rno_default_order
+ );
+
+ # whatever is left of the order_by (only where is processed at this point)
+ my $group_having = $self->_parse_rs_attrs($rs_attrs);
+
+ my $qalias = $self->_quote ($rs_attrs->{alias});
+
+ my $idx_name = $self->_quote ('rno__row__index');
+
+ $sql = sprintf (<<EOS, $offset + 1, $offset + $rows, );
+
+SELECT $outsel FROM (
+ SELECT $outsel, ROW_NUMBER() OVER($order_by ) AS $idx_name FROM (
+ SELECT $insel ${sql}${group_having}
+ ) $qalias
+) $qalias WHERE $idx_name BETWEEN %d AND %d
+
+EOS
+
+ $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
return $sql;
}
-sub _where_field_IN {
- my ($self, $lhs, $op, $rhs) = @_;
- $rhs = $self->_strip_outer_paren ($rhs);
- return $self->SUPER::_where_field_IN ($lhs, $op, $rhs);
+# some databases are happy with OVER (), some need OVER (ORDER BY (SELECT (1)) )
+sub _rno_default_order {
+ return undef;
}
-sub _where_field_BETWEEN {
- my ($self, $lhs, $op, $rhs) = @_;
- $rhs = $self->_strip_outer_paren ($rhs);
- return $self->SUPER::_where_field_BETWEEN ($lhs, $op, $rhs);
+# Informix specific limit, almost like LIMIT/OFFSET
+sub _SkipFirst {
+ my ($self, $sql, $rs_attrs, $rows, $offset) = @_;
+
+ $sql =~ s/^ \s* SELECT \s+ //ix
+ or croak "Unrecognizable SELECT: $sql";
+
+ return sprintf ('SELECT %s%s%s%s',
+ $offset
+ ? sprintf ('SKIP %d ', $offset)
+ : ''
+ ,
+ sprintf ('FIRST %d ', $rows),
+ $sql,
+ $self->_parse_rs_attrs ($rs_attrs),
+ );
}
-# Slow but ANSI standard Limit/Offset support. DB2 uses this
-sub _RowNumberOver {
- my ($self, $sql, $order, $rows, $offset ) = @_;
+# Firebird specific limit, reverse of _SkipFirst for Informix
+sub _FirstSkip {
+ my ($self, $sql, $rs_attrs, $rows, $offset) = @_;
- $offset += 1;
- my $last = $rows + $offset - 1;
- my ( $order_by ) = $self->_order_by( $order );
+ $sql =~ s/^ \s* SELECT \s+ //ix
+ or croak "Unrecognizable SELECT: $sql";
- $sql = <<"SQL";
-SELECT * FROM
-(
- SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM (
- $sql
- $order_by
- ) Q1
-) Q2
-WHERE ROW_NUM BETWEEN $offset AND $last
+ return sprintf ('SELECT %s%s%s%s',
+ sprintf ('FIRST %d ', $rows),
+ $offset
+ ? sprintf ('SKIP %d ', $offset)
+ : ''
+ ,
+ $sql,
+ $self->_parse_rs_attrs ($rs_attrs),
+ );
+}
-SQL
+# WhOracle limits
+sub _RowNum {
+ my ( $self, $sql, $rs_attrs, $rows, $offset ) = @_;
+
+ # mangle the input sql as we will be replacing the selector
+ $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//ix
+ or croak "Unrecognizable SELECT: $sql";
+ my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs);
+
+ my $qalias = $self->_quote ($rs_attrs->{alias});
+ my $idx_name = $self->_quote ('rownum__index');
+ my $order_group_having = $self->_parse_rs_attrs($rs_attrs);
+
+ $sql = sprintf (<<EOS, $offset + 1, $offset + $rows, );
+
+SELECT $outsel FROM (
+ SELECT $outsel, ROWNUM $idx_name FROM (
+ SELECT $insel ${sql}${order_group_having}
+ ) $qalias
+) $qalias WHERE $idx_name BETWEEN %d AND %d
+
+EOS
+
+ $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
return $sql;
}
-# Crappy Top based Limit/Offset support. MSSQL uses this currently,
-# but may have to switch to RowNumberOver one day
+=begin
+# Crappy Top based Limit/Offset support. Legacy from MSSQL.
sub _Top {
- my ( $self, $sql, $order, $rows, $offset ) = @_;
+ my ( $self, $sql, $rs_attrs, $rows, $offset ) = @_;
- # mangle the input sql so it can be properly aliased in the outer queries
- $sql =~ s/^ \s* SELECT \s+ (.+?) \s+ (?=FROM)//ix
+ # mangle the input sql as we will be replacing the selector
+ $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//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}},
- $sql_select,
- ));
- }
+ # get selectors
+ my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs);
+
+ # deal with order
+ my $rs_alias = $rs_attrs->{alias};
+ my $req_order = delete $rs_attrs->{order_by};
my $name_sep = $self->name_sep || '.';
+
+ # examine normalized version, collapses nesting
+ my $limit_order = scalar $self->_order_by_chunks ($req_order)
+ ? $req_order
+ : [ map
+ { join ('', $rs_alias, $name_sep, $_ ) }
+ ( $rs_attrs->{_rsroot_source_handle}->resolve->primary_columns )
+ ]
+ ;
+
+ my ( $order_by_inner, $order_by_outer ) = $self->_order_directions($limit_order);
+ my $order_by_requested = $self->_order_by ($req_order);
+
+
+
+
my $esc_name_sep = "\Q$name_sep\E";
my $col_re = qr/ ^ (?: (.+) $esc_name_sep )? ([^$esc_name_sep]+) $ /x;
- my $rs_alias = $self->{_dbic_rs_attrs}{alias};
my $quoted_rs_alias = $self->_quote ($rs_alias);
# construct the new select lists, rename(alias) some columns if necessary
my (@outer_select, @inner_select, %seen_names, %col_aliases, %outer_col_aliases);
- for (@{$self->{_dbic_rs_attrs}{select}}) {
+ for (@{$rs_attrs->{select}}) {
next if ref $_;
my ($table, $orig_colname) = ( $_ =~ $col_re );
next unless $table;
for my $i (0 .. $#sql_select) {
- my $colsel_arg = $self->{_dbic_rs_attrs}{select}[$i];
+ my $colsel_arg = $rs_attrs->{select}[$i];
my $colsel_sql = $sql_select[$i];
# this may or may not work (in case of a scalarref or something)
%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};
-
- # examine normalized version, collapses nesting
- my $limit_order;
- if (scalar $self->_order_by_chunks ($req_order)) {
- $limit_order = $req_order;
- }
- else {
- $limit_order = [ map
- { join ('', $rs_alias, $name_sep, $_ ) }
- ( $self->{_dbic_rs_attrs}{_source_handle}->resolve->primary_columns )
- ];
- }
-
- 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->{order_by};
- my $grpby_having = $self->_order_by ($order);
+ my $grpby_having = $self->_parse_rs_attrs ($rs_attrs);
# short circuit for counts - the ordering complexity is needless
- if ($self->{_dbic_rs_attrs}{-for_count_only}) {
+ if ($rs_attrs->{-for_count_only}) {
return "SELECT TOP $rows $inner_select $sql $grpby_having $order_by_outer";
}
$sql =~ s/\s*\n\s*/ /g; # parsing out multiline statements is harder than a single line
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 unqualified 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};
-}
-
-
+=cut
# 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 $for_syntax = {
- update => 'FOR UPDATE',
- shared => 'FOR SHARE',
-};
# Quotes table names, handles "limit" dialects (e.g. where rownum between x and
-# y), supports SELECT ... FOR UPDATE and SELECT ... FOR SHARE.
+# y)
sub select {
- my ($self, $table, $fields, $where, $order, @rest) = @_;
+ my ($self, $table, $fields, $where, $rs_attrs, @rest) = @_;
$self->{"${_}_bind"} = [] for (qw/having from order/);
@rest = (-1) unless defined $rest[0];
croak "LIMIT 0 Does Not Compute" if $rest[0] == 0;
# and anyway, SQL::Abstract::Limit will cause a barf if we don't first
+
my ($sql, @where_bind) = $self->SUPER::select(
- $table, $self->_recurse_fields($fields), $where, $order, @rest
+ $table, $self->_recurse_fields($fields), $where, $rs_attrs, @rest
);
- 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;
}
# 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"
+ my $sql = "INSERT INTO ${table} DEFAULT VALUES";
+
+ if (my $ret = ($_[1]||{})->{returning} ) {
+ $sql .= $self->_insert_returning ($ret);
+ }
+
+ return $sql;
}
$self->SUPER::insert($table, @_);
sub _emulate_limit {
my $self = shift;
+ # my ( $syntax, $sql, $order, $rows, $offset ) = @_;
+
if ($_[3] == -1) {
- return $_[1].$self->_order_by($_[2]);
+ return $_[1] . $self->_parse_rs_attrs($_[2]);
} else {
return $self->SUPER::_emulate_limit(@_);
}
}
sub _recurse_fields {
- my ($self, $fields, $params) = @_;
+ my ($self, $fields) = @_;
my $ref = ref $fields;
return $self->_quote($fields) unless $ref;
return $$fields if $ref eq 'SCALAR';
if ($ref eq 'ARRAY') {
- return join(', ', map {
- $self->_recurse_fields($_)
- .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack})
- ? ' AS col'.$self->{rownum_hack_count}++
- : '')
- } @$fields);
+ return join(', ', map { $self->_recurse_fields($_) } @$fields);
}
elsif ($ref eq 'HASH') {
- my %hash = %$fields;
+ my %hash = %$fields; # shallow copy
my $as = delete $hash{-as}; # if supplied
- my ($func, $args) = each %hash;
- delete $hash{$func};
+ my ($func, $args, @toomany) = %hash;
+
+ # there should be only one pair
+ if (@toomany) {
+ croak "Malformed select argument - too many keys in hash: " . join (',', keys %$fields );
+ }
if (lc ($func) eq 'distinct' && ref $args eq 'ARRAY' && @$args > 1) {
croak (
$self->_sqlcase($func),
$self->_recurse_fields($args),
$as
- ? sprintf (' %s %s', $self->_sqlcase('as'), $as)
+ ? sprintf (' %s %s', $self->_sqlcase('as'), $self->_quote ($as) )
: ''
);
- # there should be nothing left
- if (keys %hash) {
- croak "Malformed select argument - too many keys in hash: " . join (',', keys %$fields );
- }
-
return $select;
}
# Is the second check absolutely necessary?
}
}
-sub _order_by {
+my $for_syntax = {
+ update => 'FOR UPDATE',
+ shared => 'FOR SHARE',
+};
+
+# this used to be a part of _order_by but is broken out for clarity.
+# What we have been doing forever is hijacking the $order arg of
+# SQLA::select to pass in arbitrary pieces of data (first the group_by,
+# then pretty much the entire resultset attr-hash, as more and more
+# things in the SQLA space need to have mopre info about the $rs they
+# create SQL for. The alternative would be to keep expanding the
+# signature of _select with more and more positional parameters, which
+# is just gross. All hail SQLA2!
+sub _parse_rs_attrs {
my ($self, $arg) = @_;
- if (ref $arg eq 'HASH' and keys %$arg and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) {
+ my $sql = '';
- my $ret = '';
+ if (my $g = $self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 }) ) {
+ $sql .= $self->_sqlcase(' group by ') . $g;
+ }
- if (my $g = $self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 }) ) {
- $ret = $self->_sqlcase(' group by ') . $g;
- }
+ if (defined $arg->{having}) {
+ my ($frag, @bind) = $self->_recurse_where($arg->{having});
+ push(@{$self->{having_bind}}, @bind);
+ $sql .= $self->_sqlcase(' having ') . $frag;
+ }
- if (defined $arg->{having}) {
- my ($frag, @bind) = $self->_recurse_where($arg->{having});
- push(@{$self->{having_bind}}, @bind);
- $ret .= $self->_sqlcase(' having ').$frag;
- }
+ if (defined $arg->{order_by}) {
+ $sql .= $self->_order_by ($arg->{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 (my $for = $arg->{for}) {
+ $sql .= " $for_syntax->{$for}" if $for_syntax->{$for};
+ }
- return $ret;
+ return $sql;
+}
+
+sub _order_by {
+ my ($self, $arg) = @_;
+
+ # check that we are not called in legacy mode (order_by as 4th argument)
+ if (ref $arg eq 'HASH' and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) {
+ return $self->_parse_rs_attrs ($arg);
}
else {
my ($sql, @bind) = $self->SUPER::_order_by ($arg);
- push(@{$self->{order_bind}}, @bind);
+ push @{$self->{order_bind}}, @bind;
return $sql;
}
}
}
}
+sub _generate_join_clause {
+ my ($self, $join_type) = @_;
+
+ return sprintf ('%s JOIN ',
+ $join_type ? ' ' . uc($join_type) : ''
+ );
+}
+
sub _recurse_from {
my ($self, $from, @join) = @_;
my @sqlf;
$join_type =~ s/^\s+ | \s+$//xg;
}
- $join_type ||= $self->_default_jointype;
+ $join_type = $self->{_default_jointype} if not defined $join_type;
- my $join_clause = sprintf ('%s JOIN ',
- $join_type ? ' ' . uc($join_type) : ''
- );
- push @sqlf, $join_clause;
+ push @sqlf, $self->_generate_join_clause( $join_type );
if (ref $to eq 'ARRAY') {
push(@sqlf, '(', $self->_recurse_from(@$to), ')');
return join('', @sqlf);
}
-sub _default_jointype {};
-
sub _fold_sqlbind {
my ($self, $sqlbind) = @_;
}
}
-sub _quote {
- my ($self, $label) = @_;
- return '' unless defined $label;
- return $$label if ref($label) eq 'SCALAR';
- return "*" if $label eq '*';
- return $label unless $self->{quote_char};
- if(ref $self->{quote_char} eq "ARRAY"){
- return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1]
- if !defined $self->{name_sep};
- my $sep = $self->{name_sep};
- return join($self->{name_sep},
- map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] }
- split(/\Q$sep\E/,$label));
- }
- return $self->SUPER::_quote($label);
-}
-
sub limit_dialect {
my $self = shift;
- $self->{limit_dialect} = shift if @_;
+ if (@_) {
+ $self->{limit_dialect} = shift;
+ undef $self->{_cached_syntax};
+ }
return $self->{limit_dialect};
}
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