package # Hide from PAUSE
DBIx::Class::SQLAHacks;
-# This module is a subclass of SQL::Abstract::Limit and includes a number
-# of DBIC-specific workarounds, not yet suitable for inclusion into the
-# SQLA core
-
-use base qw/SQL::Abstract::Limit/;
-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
- # 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::$f"} = Sub::Name::subname "SQL::Abstract::$f" =>
- sub {
- if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) {
- __PACKAGE__->can($f)->(@_);
- }
- else {
- goto $orig;
- }
- };
- }
-}
-
-
-# Tries to determine limit dialect.
-#
-sub new {
- my $self = shift->SUPER::new(@_);
-
- # This prevents the caching of $dbh in S::A::L, I believe
- # If limit_dialect is a ref (like a $dbh), go ahead and replace
- # it with what it resolves to:
- $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect})
- if ref $self->{limit_dialect};
-
- $self;
-}
-
-# !!! THIS IS ALSO HORRIFIC !!! /me ashamed
-#
-# Generates inner/outer select lists for various limit dialects
-# which result in one or more subqueries (e.g. RNO, Top, RowNum)
-# Any non-root-table columns need to have their table qualifier
-# turned into a column alias (otherwise names in subqueries clash
-# and/or lose their source table)
-#
-# Returns inner/outer strings of SQL QUOTED selectors with aliases
-# (to be used in whatever select statement), and an alias index hashref
-# of QUOTED SEL => QUOTED ALIAS pairs (to maybe be used for string-subst
-# higher up).
-# If an order_by is supplied, the inner select needs to bring out columns
-# used in implicit (non-selected) orders, and the order condition itself
-# needs to be realiased to the proper names in the outer query. Thus we
-# also return a hashref (order doesn't matter) of QUOTED EXTRA-SEL =>
-# QUOTED ALIAS pairs, which is a list of extra selectors that do *not*
-# exist in the original select list
-
-sub _subqueried_limit_attrs {
- my ($self, $rs_attrs) = @_;
-
- croak 'Limit dialect implementation usable only in the context of DBIC (missing $rs_attrs)'
- unless ref ($rs_attrs) eq 'HASH';
-
- my ($re_sep, $re_alias) = map { quotemeta $_ } (
- $self->name_sep || '.',
- $rs_attrs->{alias},
- );
-
- # correlate select and as, build selection index
- my (@sel, $in_sel_index);
- for my $i (0 .. $#{$rs_attrs->{select}}) {
-
- my $s = $rs_attrs->{select}[$i];
- my $sql_sel = $self->_recurse_fields ($s);
- my $sql_alias = (ref $s) eq 'HASH' ? $s->{-as} : undef;
-
-
- push @sel, {
- sql => $sql_sel,
- unquoted_sql => do { local $self->{quote_char}; $self->_recurse_fields ($s) },
- as =>
- $sql_alias
- ||
- $rs_attrs->{as}[$i]
- ||
- croak "Select argument $i ($s) without corresponding 'as'"
- ,
- };
-
- $in_sel_index->{$sql_sel}++;
- $in_sel_index->{$self->_quote ($sql_alias)}++ if $sql_alias;
-
- # record unqualified versions too, so we do not have
- # to reselect the same column twice (in qualified and
- # unqualified form)
- if (! ref $s && $sql_sel =~ / $re_sep (.+) $/x) {
- $in_sel_index->{$1}++;
- }
- }
-
-
- # re-alias and remove any name separators from aliases,
- # unless we are dealing with the current source alias
- # (which will transcend the subqueries as it is necessary
- # for possible further chaining)
- my (@in_sel, @out_sel, %renamed);
- for my $node (@sel) {
- if (List::Util::first { $_ =~ / (?<! $re_alias ) $re_sep /x } ($node->{as}, $node->{unquoted_sql}) ) {
- $node->{as} =~ s/ $re_sep /__/xg;
- my $quoted_as = $self->_quote($node->{as});
- push @in_sel, sprintf '%s AS %s', $node->{sql}, $quoted_as;
- push @out_sel, $quoted_as;
- $renamed{$node->{sql}} = $quoted_as;
- }
- else {
- push @in_sel, $node->{sql};
- push @out_sel, $self->_quote ($node->{as});
- }
- }
-
- # see if the order gives us anything
- my %extra_order_sel;
- for my $chunk ($self->_order_by_chunks ($rs_attrs->{order_by})) {
- # order with bind
- $chunk = $chunk->[0] if (ref $chunk) eq 'ARRAY';
- $chunk =~ s/\s+ (?: ASC|DESC ) \s* $//ix;
-
- next if $in_sel_index->{$chunk};
-
- $extra_order_sel{$chunk} ||= $self->_quote (
- 'ORDER__BY__' . scalar keys %extra_order_sel
- );
- }
-
- return (
- (map { join (', ', @$_ ) } (
- \@in_sel,
- \@out_sel)
- ),
- \%renamed,
- keys %extra_order_sel ? \%extra_order_sel : (),
- );
-}
-
-# ANSI standard Limit/Offset implementation. DB2 and MSSQL >= 2005 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: $sql";
-
- # get selectors, and scan the order_by (if any)
- my ($in_sel, $out_sel, $alias_map, $extra_order_sel)
- = $self->_subqueried_limit_attrs ( $rs_attrs );
-
- # make up an order if none exists
- my $requested_order = (delete $rs_attrs->{order_by}) || $self->_rno_default_order;
- my $rno_ord = $self->_order_by ($requested_order);
-
- # this is the order supplement magic
- my $mid_sel = $out_sel;
- if ($extra_order_sel) {
- for my $extra_col (sort
- { $extra_order_sel->{$a} cmp $extra_order_sel->{$b} }
- keys %$extra_order_sel
- ) {
- $in_sel .= sprintf (', %s AS %s',
- $extra_col,
- $extra_order_sel->{$extra_col},
- );
-
- $mid_sel .= ', ' . $extra_order_sel->{$extra_col};
- }
- }
-
- # and this is order re-alias magic
- for ($extra_order_sel, $alias_map) {
- for my $col (keys %$_) {
- my $re_col = quotemeta ($col);
- $rno_ord =~ s/$re_col/$_->{$col}/;
- }
- }
-
- # 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 $out_sel FROM (
- SELECT $mid_sel, ROW_NUMBER() OVER( $rno_ord ) AS $idx_name FROM (
- SELECT $in_sel ${sql}${group_having}
- ) $qalias
-) $qalias WHERE $idx_name BETWEEN %u AND %u
-
-EOS
-
- $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
- return $sql;
-}
-
-# some databases are happy with OVER (), some need OVER (ORDER BY (SELECT (1)) )
-sub _rno_default_order {
- return undef;
-}
-
-# Informix specific limit, almost like LIMIT/OFFSET
-sub _SkipFirst {
- my ($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 %u ', $offset)
- : ''
- ,
- sprintf ('FIRST %u ', $rows),
- $sql,
- $self->_parse_rs_attrs ($rs_attrs),
- );
-}
-
-# Firebird specific limit, reverse of _SkipFirst for Informix
-sub _FirstSkip {
- 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',
- sprintf ('FIRST %u ', $rows),
- $offset
- ? sprintf ('SKIP %u ', $offset)
- : ''
- ,
- $sql,
- $self->_parse_rs_attrs ($rs_attrs),
- );
-}
-
-# 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) = $self->_subqueried_limit_attrs ($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 %u AND %u
-
-EOS
-
- $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
- return $sql;
-}
-
-# Crappy Top based Limit/Offset support. Legacy for MSSQL < 2005
-sub _Top {
- 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: $sql";
-
- # get selectors
- my ($in_sel, $out_sel, $alias_map, $extra_order_sel)
- = $self->_subqueried_limit_attrs ($rs_attrs);
-
- my $requested_order = delete $rs_attrs->{order_by};
-
- my $order_by_requested = $self->_order_by ($requested_order);
-
- # make up an order unless supplied
- my $inner_order = ($order_by_requested
- ? $requested_order
- : [ map
- { join ('', $rs_attrs->{alias}, $self->{name_sep}||'.', $_ ) }
- ( $rs_attrs->{_rsroot_source_handle}->resolve->_pri_cols )
- ]
- );
-
- my ($order_by_inner, $order_by_reversed);
-
- # localise as we already have all the bind values we need
- {
- local $self->{order_bind};
- $order_by_inner = $self->_order_by ($inner_order);
-
- my @out_chunks;
- for my $ch ($self->_order_by_chunks ($inner_order)) {
- $ch = $ch->[0] if ref $ch eq 'ARRAY';
-
- $ch =~ s/\s+ ( ASC|DESC ) \s* $//ix;
- my $dir = uc ($1||'ASC');
-
- push @out_chunks, \join (' ', $ch, $dir eq 'ASC' ? 'DESC' : 'ASC' );
- }
-
- $order_by_reversed = $self->_order_by (\@out_chunks);
- }
-
- # this is the order supplement magic
- my $mid_sel = $out_sel;
- if ($extra_order_sel) {
- for my $extra_col (sort
- { $extra_order_sel->{$a} cmp $extra_order_sel->{$b} }
- keys %$extra_order_sel
- ) {
- $in_sel .= sprintf (', %s AS %s',
- $extra_col,
- $extra_order_sel->{$extra_col},
- );
-
- $mid_sel .= ', ' . $extra_order_sel->{$extra_col};
- }
-
- # since whatever order bindvals there are, they will be realiased
- # and need to show up in front of the entire initial inner subquery
- # Unshift *from_bind* to make this happen (horrible, horrible, but
- # we don't have another mechanism yet)
- unshift @{$self->{from_bind}}, @{$self->{order_bind}};
- }
-
- # and this is order re-alias magic
- for my $map ($extra_order_sel, $alias_map) {
- for my $col (keys %$map) {
- my $re_col = quotemeta ($col);
- $_ =~ s/$re_col/$map->{$col}/
- for ($order_by_reversed, $order_by_requested);
- }
- }
-
- # generate the rest of the sql
- my $grpby_having = $self->_parse_rs_attrs ($rs_attrs);
-
- my $quoted_rs_alias = $self->_quote ($rs_attrs->{alias});
-
- $sql = sprintf ('SELECT TOP %u %s %s %s %s',
- $rows + ($offset||0),
- $in_sel,
- $sql,
- $grpby_having,
- $order_by_inner,
- );
-
- $sql = sprintf ('SELECT TOP %u %s FROM ( %s ) %s %s',
- $rows,
- $mid_sel,
- $sql,
- $quoted_rs_alias,
- $order_by_reversed,
- ) if $offset;
-
- $sql = sprintf ('SELECT TOP %u %s FROM ( %s ) %s %s',
- $rows,
- $out_sel,
- $sql,
- $quoted_rs_alias,
- $order_by_requested,
- ) if ( ($offset && $order_by_requested) || ($mid_sel ne $out_sel) );
-
- $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
- return $sql;
-}
-
-# This is the most evil limit "dialect" (more of a hack) for *really*
-# stupid databases. It works by ordering the set by some unique column,
-# and calculating amount of rows that have a less-er value (thus
-# emulating a RowNum-like index). Of course this implies the set can
-# only be ordered by a single unique columns.
-sub _GenericSubQ {
- my ($self, $sql, $rs_attrs, $rows, $offset) = @_;
-
- my $root_rsrc = $rs_attrs->{_rsroot_source_handle}->resolve;
- my $root_tbl_name = $root_rsrc->name;
-
- # 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: $sql";
-
- my ($order_by, @rest) = do {
- local $self->{quote_char};
- $self->_order_by_chunks ($rs_attrs->{order_by})
- };
-
- unless (
- $order_by
- &&
- ! @rest
- &&
- ( ! ref $order_by
- ||
- ( ref $order_by eq 'ARRAY' and @$order_by == 1 )
- )
- ) {
- croak (
- 'Generic Subquery Limit does not work on resultsets without an order, or resultsets '
- . 'with complex order criteria (multicolumn and/or functions). Provide a single, '
- . 'unique-column order criteria.'
- );
- }
-
- ($order_by) = @$order_by if ref $order_by;
-
- $order_by =~ s/\s+ ( ASC|DESC ) \s* $//ix;
- my $direction = lc ($1 || 'asc');
-
- my ($unq_sort_col) = $order_by =~ /(?:^|\.)([^\.]+)$/;
-
- my $inf = $root_rsrc->storage->_resolve_column_info (
- $rs_attrs->{from}, [$order_by, $unq_sort_col]
- );
-
- my $ord_colinfo = $inf->{$order_by} || croak "Unable to determine source of order-criteria '$order_by'";
-
- if ($ord_colinfo->{-result_source}->name ne $root_tbl_name) {
- croak "Generic Subquery Limit order criteria can be only based on the root-source '"
- . $root_rsrc->source_name . "' (aliased as '$rs_attrs->{alias}')";
- }
-
- # make sure order column is qualified
- $order_by = "$rs_attrs->{alias}.$order_by"
- unless $order_by =~ /^$rs_attrs->{alias}\./;
-
- my $is_u;
- my $ucs = { $root_rsrc->unique_constraints };
- for (values %$ucs ) {
- if (@$_ == 1 && "$rs_attrs->{alias}.$_->[0]" eq $order_by) {
- $is_u++;
- last;
- }
- }
- croak "Generic Subquery Limit order criteria column '$order_by' must be unique (no unique constraint found)"
- unless $is_u;
-
- my ($in_sel, $out_sel, $alias_map, $extra_order_sel)
- = $self->_subqueried_limit_attrs ($rs_attrs);
-
- my $cmp_op = $direction eq 'desc' ? '>' : '<';
- my $count_tbl_alias = 'rownum__emulation';
-
- my $order_group_having = $self->_parse_rs_attrs($rs_attrs);
-
- # add the order supplement (if any) as this is what will be used for the outer WHERE
- $in_sel .= ", $_" for keys %{$extra_order_sel||{}};
-
- $sql = sprintf (<<EOS,
-SELECT $out_sel
- FROM (
- SELECT $in_sel ${sql}${order_group_having}
- ) %s
-WHERE ( SELECT COUNT(*) FROM %s %s WHERE %s $cmp_op %s ) %s
-EOS
- ( map { $self->_quote ($_) } (
- $rs_attrs->{alias},
- $root_tbl_name,
- $count_tbl_alias,
- "$count_tbl_alias.$unq_sort_col",
- $order_by,
- )),
- $offset
- ? sprintf ('BETWEEN %u AND %u', $offset, $offset + $rows - 1)
- : sprintf ('< %u', $rows )
- ,
- );
-
- $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger
- return $sql;
-}
-
-
-# While we're at it, this should make LIMIT queries more efficient,
-# without digging into things too deeply
-sub _find_syntax {
- my ($self, $syntax) = @_;
- return $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax);
-}
-
-# Quotes table names, handles "limit" dialects (e.g. where rownum between x and
-# y)
-sub select {
- my ($self, $table, $fields, $where, $rs_attrs, @rest) = @_;
-
- if (not ref($table) or ref($table) eq 'SCALAR') {
- $table = $self->_quote($table);
- }
-
- @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 $sql = '';
- ($sql, @{$self->{where_bind}}) = $self->SUPER::select(
- $table, $self->_recurse_fields($fields), $where, $rs_attrs, @rest
- );
-
-# this *must* be called, otherwise extra binds will remain in the sql-maker
- my @bind = $self->_assemble_binds;
-
- return wantarray ? ($sql, @bind) : $sql;
-}
-
-sub _assemble_binds {
- my $self = shift;
- return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/from where having order/);
-}
-
-# Quotes table names, and handles default inserts
-sub insert {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($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]} ) ) {
- my $sql = "INSERT INTO ${table} DEFAULT VALUES";
-
- if (my $ret = ($_[1]||{})->{returning} ) {
- $sql .= $self->_insert_returning ($ret);
- }
-
- return $sql;
- }
-
- $self->SUPER::insert($table, @_);
-}
-
-# Just quotes table names.
-sub update {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table);
- $self->SUPER::update($table, @_);
-}
-
-# Just quotes table names.
-sub delete {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table);
- $self->SUPER::delete($table, @_);
-}
-
-sub _emulate_limit {
- my $self = shift;
- # my ( $syntax, $sql, $order, $rows, $offset ) = @_;
-
- if ($_[3] == -1) {
- return $_[1] . $self->_parse_rs_attrs($_[2]);
- } else {
- return $self->SUPER::_emulate_limit(@_);
- }
-}
-
-sub _recurse_fields {
- my ($self, $fields) = @_;
- my $ref = ref $fields;
- return $self->_quote($fields) unless $ref;
- return $$fields if $ref eq 'SCALAR';
-
- if ($ref eq 'ARRAY') {
- return join(', ', map { $self->_recurse_fields($_) } @$fields);
- }
- elsif ($ref eq 'HASH') {
- my %hash = %$fields; # shallow copy
-
- my $as = delete $hash{-as}; # if supplied
-
- my ($func, $args, @toomany) = %hash;
-
- # there should be only one pair
- if (@toomany) {
- croak "Malformed select argument - too many keys in hash: " . join (',', keys %$fields );
- }
-
- if (lc ($func) eq 'distinct' && ref $args eq 'ARRAY' && @$args > 1) {
- croak (
- 'The select => { distinct => ... } syntax is not supported for multiple columns.'
- .' Instead please use { group_by => [ qw/' . (join ' ', @$args) . '/ ] }'
- .' or { select => [ qw/' . (join ' ', @$args) . '/ ], distinct => 1 }'
- );
- }
-
- my $select = sprintf ('%s( %s )%s',
- $self->_sqlcase($func),
- $self->_recurse_fields($args),
- $as
- ? sprintf (' %s %s', $self->_sqlcase('as'), $self->_quote ($as) )
- : ''
- );
-
- return $select;
- }
- # Is the second check absolutely necessary?
- elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) {
- return $self->_fold_sqlbind( $fields );
- }
- else {
- croak($ref . qq{ unexpected in _recurse_fields()})
- }
-}
-
-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) = @_;
-
- my $sql = '';
-
- if (my $g = $self->_recurse_fields($arg->{group_by}) ) {
- $sql .= $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->{order_by}) {
- $sql .= $self->_order_by ($arg->{order_by});
- }
-
- if (my $for = $arg->{for}) {
- $sql .= " $for_syntax->{$for}" if $for_syntax->{$for};
- }
-
- 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;
- return $sql;
- }
-}
-
-sub _order_directions {
- my ($self, $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 {
- my ($self, $from) = @_;
- if (ref $from eq 'ARRAY') {
- return $self->_recurse_from(@$from);
- } elsif (ref $from eq 'HASH') {
- return $self->_make_as($from);
- } else {
- return $from; # would love to quote here but _table ends up getting called
- # twice during an ->select without a limit clause due to
- # the way S::A::Limit->select works. should maybe consider
- # bypassing this and doing S::A::select($self, ...) in
- # our select method above. meantime, quoting shims have
- # been added to select/insert/update/delete here
- }
-}
-
-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;
- push(@sqlf, $self->_make_as($from));
- foreach my $j (@join) {
- my ($to, $on) = @$j;
-
-
- # check whether a join type exists
- my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to;
- my $join_type;
- if (ref($to_jt) eq 'HASH' and defined($to_jt->{-join_type})) {
- $join_type = $to_jt->{-join_type};
- $join_type =~ s/^\s+ | \s+$//xg;
- }
-
- $join_type = $self->{_default_jointype} if not defined $join_type;
-
- push @sqlf, $self->_generate_join_clause( $join_type );
-
- if (ref $to eq 'ARRAY') {
- push(@sqlf, '(', $self->_recurse_from(@$to), ')');
- } else {
- push(@sqlf, $self->_make_as($to));
- }
- push(@sqlf, ' ON ', $self->_join_condition($on));
- }
- return join('', @sqlf);
-}
-
-sub _fold_sqlbind {
- my ($self, $sqlbind) = @_;
-
- my @sqlbind = @$$sqlbind; # copy
- my $sql = shift @sqlbind;
- push @{$self->{from_bind}}, @sqlbind;
-
- return $sql;
-}
-
-sub _make_as {
- my ($self, $from) = @_;
- return join(' ', map { (ref $_ eq 'SCALAR' ? $$_
- : ref $_ eq 'REF' ? $self->_fold_sqlbind($_)
- : $self->_quote($_))
- } reverse each %{$self->_skip_options($from)});
-}
-
-sub _skip_options {
- my ($self, $hash) = @_;
- my $clean_hash = {};
- $clean_hash->{$_} = $hash->{$_}
- for grep {!/^-/} keys %$hash;
- return $clean_hash;
-}
-
-sub _join_condition {
- my ($self, $cond) = @_;
- if (ref $cond eq 'HASH') {
- my %j;
- for (keys %$cond) {
- my $v = $cond->{$_};
- if (ref $v) {
- croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'})
- if ref($v) ne 'SCALAR';
- $j{$_} = $v;
- }
- else {
- my $x = '= '.$self->_quote($v); $j{$_} = \$x;
- }
- };
- return scalar($self->_recurse_where(\%j));
- } elsif (ref $cond eq 'ARRAY') {
- return join(' OR ', map { $self->_join_condition($_) } @$cond);
- } else {
- die "Can't handle this yet!";
- }
-}
-
-sub limit_dialect {
- my $self = shift;
- if (@_) {
- $self->{limit_dialect} = shift;
- undef $self->{_cached_syntax};
- }
- return $self->{limit_dialect};
-}
-
-# Set to an array-ref to specify separate left and right quotes for table names.
-# A single scalar is equivalen to [ $char, $char ]
-sub quote_char {
- my $self = shift;
- $self->{quote_char} = shift if @_;
- return $self->{quote_char};
-}
+use strict;
-# Character separating quoted table names.
-sub name_sep {
- my $self = shift;
- $self->{name_sep} = shift if @_;
- return $self->{name_sep};
-}
+use base qw/DBIx::Class::SQLMaker/;
1;
projects / dbsrgits/DBIx-Class.git / blobdiff