--- /dev/null
+package DBIx::Class::SQLMaker;
+
+use strict;
+use warnings;
+
+=head1 NAME
+
+DBIx::Class::SQLMaker - An SQL::Abstract-based SQL maker class
+
+=head1 DESCRIPTION
+
+This module is a subclass of L<SQL::Abstract> and includes a number of
+DBIC-specific workarounds, not yet suitable for inclusion into the
+L<SQL::Abstract> core. It also provides all (and more than) the functionality
+of L<SQL::Abstract::Limit>, see L<DBIx::Class::SQLMaker::LimitDialects> for
+more info.
+
+Currently the enhancements to L<SQL::Abstract> are:
+
+=over
+
+=item * Support for C<JOIN> statements (via extended C<table/from> support)
+
+=item * Support of functions in C<SELECT> lists
+
+=item * C<GROUP BY>/C<HAVING> support (via extensions to the order_by parameter)
+
+=item * Support of C<...FOR UPDATE> type of select statement modifiers
+
+=back
+
+=cut
+
+use base qw/
+ DBIx::Class::SQLMaker::LimitDialects
+ SQL::Abstract
+ DBIx::Class
+/;
+use mro 'c3';
+
+use Sub::Name 'subname';
+use DBIx::Class::Carp;
+use namespace::clean;
+
+__PACKAGE__->mk_group_accessors (simple => qw/quote_char name_sep limit_dialect/);
+
+sub _quoting_enabled {
+ ( defined $_[0]->{quote_char} and length $_[0]->{quote_char} ) ? 1 : 0
+}
+
+# for when I need a normalized l/r pair
+sub _quote_chars {
+
+ # in case we are called in the old !!$sm->_quote_chars fashion
+ return () if !wantarray and ( ! defined $_[0]->{quote_char} or ! length $_[0]->{quote_char} );
+
+ map
+ { defined $_ ? $_ : '' }
+ ( ref $_[0]->{quote_char} ? (@{$_[0]->{quote_char}}) : ( ($_[0]->{quote_char}) x 2 ) )
+ ;
+}
+
+# FIXME when we bring in the storage weaklink, check its schema
+# weaklink and channel through $schema->throw_exception
+sub throw_exception { DBIx::Class::Exception->throw($_[1]) }
+
+BEGIN {
+ # reinstall the belch()/puke() functions of SQL::Abstract with custom versions
+ # that use DBIx::Class::Carp/DBIx::Class::Exception instead of plain Carp
+ no warnings qw/redefine/;
+
+ *SQL::Abstract::belch = subname 'SQL::Abstract::belch' => sub (@) {
+ my($func) = (caller(1))[3];
+ carp "[$func] Warning: ", @_;
+ };
+
+ *SQL::Abstract::puke = subname 'SQL::Abstract::puke' => sub (@) {
+ my($func) = (caller(1))[3];
+ __PACKAGE__->throw_exception("[$func] Fatal: " . join ('', @_));
+ };
+}
+
+# the "oh noes offset/top without limit" constant
+# limited to 31 bits for sanity (and consistency,
+# since it may be handed to the like of sprintf %u)
+#
+# Also *some* builds of SQLite fail the test
+# some_column BETWEEN ? AND ?: 1, 4294967295
+# with the proper integer bind attrs
+#
+# Implemented as a method, since ::Storage::DBI also
+# refers to it (i.e. for the case of software_limit or
+# as the value to abuse with MSSQL ordered subqueries)
+sub __max_int () { 0x7FFFFFFF };
+
+# we ne longer need to check this - DBIC has ways of dealing with it
+# specifically ::Storage::DBI::_resolve_bindattrs()
+sub _assert_bindval_matches_bindtype () { 1 };
+
+# poor man's de-qualifier
+sub _quote {
+ $_[0]->next::method( ( $_[0]{_dequalify_idents} and ! ref $_[1] )
+ ? $_[1] =~ / ([^\.]+) $ /x
+ : $_[1]
+ );
+}
+
+sub _where_op_NEST {
+ carp_unique ("-nest in search conditions is deprecated, you most probably wanted:\n"
+ .q|{..., -and => [ \%cond0, \@cond1, \'cond2', \[ 'cond3', [ col => bind ] ], etc. ], ... }|
+ );
+
+ shift->next::method(@_);
+}
+
+# Handle limit-dialect selection
+sub select {
+ my ($self, $table, $fields, $where, $rs_attrs, $limit, $offset) = @_;
+
+
+ ($fields, @{$self->{select_bind}}) = $self->_recurse_fields($fields);
+
+ if (defined $offset) {
+ $self->throw_exception('A supplied offset must be a non-negative integer')
+ if ( $offset =~ /\D/ or $offset < 0 );
+ }
+ $offset ||= 0;
+
+ if (defined $limit) {
+ $self->throw_exception('A supplied limit must be a positive integer')
+ if ( $limit =~ /\D/ or $limit <= 0 );
+ }
+ elsif ($offset) {
+ $limit = $self->__max_int;
+ }
+
+
+ my ($sql, @bind);
+ if ($limit) {
+ # this is legacy code-flow from SQLA::Limit, it is not set in stone
+ ($sql, @bind) = $self->next::method ($table, $fields, $where);
+
+ my $limiter;
+
+ if( $limiter = $self->can ('emulate_limit') ) {
+ carp_unique(
+ 'Support for the legacy emulate_limit() mechanism inherited from '
+ . 'SQL::Abstract::Limit has been deprecated, and will be removed when '
+ . 'DBIC transitions to Data::Query. If your code uses this type of '
+ . 'limit specification please file an RT and provide the source of '
+ . 'your emulate_limit() implementation, so an acceptable upgrade-path '
+ . 'can be devised'
+ );
+ }
+ else {
+ my $dialect = $self->limit_dialect
+ or $self->throw_exception( "Unable to generate SQL-limit - no limit dialect specified on $self" );
+
+ $limiter = $self->can ("_$dialect")
+ or $self->throw_exception(__PACKAGE__ . " does not implement the requested dialect '$dialect'");
+ }
+
+ $sql = $self->$limiter (
+ $sql,
+ { %{$rs_attrs||{}}, _selector_sql => $fields },
+ $limit,
+ $offset
+ );
+ }
+ else {
+ ($sql, @bind) = $self->next::method ($table, $fields, $where, $rs_attrs);
+ }
+
+ push @{$self->{where_bind}}, @bind;
+
+# this *must* be called, otherwise extra binds will remain in the sql-maker
+ my @all_bind = $self->_assemble_binds;
+
+ $sql .= $self->_lock_select ($rs_attrs->{for})
+ if $rs_attrs->{for};
+
+ return wantarray ? ($sql, @all_bind) : $sql;
+}
+
+sub _assemble_binds {
+ my $self = shift;
+ return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/pre_select select from where group having order limit/);
+}
+
+my $for_syntax = {
+ update => 'FOR UPDATE',
+ shared => 'FOR SHARE',
+};
+sub _lock_select {
+ my ($self, $type) = @_;
+
+ my $sql;
+ if (ref($type) eq 'SCALAR') {
+ $sql = "FOR $$type";
+ }
+ else {
+ $sql = $for_syntax->{$type} || $self->throw_exception( "Unknown SELECT .. FOR type '$type' requested" );
+ }
+
+ return " $sql";
+}
+
+# Handle default inserts
+sub insert {
+# optimized due to hotttnesss
+# my ($self, $table, $data, $options) = @_;
+
+ # SQLA will emit INSERT INTO $table ( ) VALUES ( )
+ # which is sadly understood only by MySQL. Change default behavior here,
+ # until SQLA2 comes with proper dialect support
+ if (! $_[2] or (ref $_[2] eq 'HASH' and !keys %{$_[2]} ) ) {
+ my @bind;
+ my $sql = sprintf(
+ 'INSERT INTO %s DEFAULT VALUES', $_[0]->_quote($_[1])
+ );
+
+ if ( ($_[3]||{})->{returning} ) {
+ my $s;
+ ($s, @bind) = $_[0]->_insert_returning ($_[3]);
+ $sql .= $s;
+ }
+
+ return ($sql, @bind);
+ }
+
+ next::method(@_);
+}
+
+sub _recurse_fields {
+ my ($self, $fields) = @_;
+ my $ref = ref $fields;
+ return $self->_quote($fields) unless $ref;
+ return $$fields if $ref eq 'SCALAR';
+
+ if ($ref eq 'ARRAY') {
+ my (@select, @bind);
+ for my $field (@$fields) {
+ my ($select, @new_bind) = $self->_recurse_fields($field);
+ push @select, $select;
+ push @bind, @new_bind;
+ }
+ return (join(', ', @select), @bind);
+ }
+ elsif ($ref eq 'HASH') {
+ my %hash = %$fields; # shallow copy
+
+ my $as = delete $hash{-as}; # if supplied
+
+ my ($func, $rhs, @toomany) = %hash;
+
+ # there should be only one pair
+ if (@toomany) {
+ $self->throw_exception( "Malformed select argument - too many keys in hash: " . join (',', keys %$fields ) );
+ }
+
+ if (lc ($func) eq 'distinct' && ref $rhs eq 'ARRAY' && @$rhs > 1) {
+ $self->throw_exception (
+ 'The select => { distinct => ... } syntax is not supported for multiple columns.'
+ .' Instead please use { group_by => [ qw/' . (join ' ', @$rhs) . '/ ] }'
+ .' or { select => [ qw/' . (join ' ', @$rhs) . '/ ], distinct => 1 }'
+ );
+ }
+
+ my ($rhs_sql, @rhs_bind) = $self->_recurse_fields($rhs);
+ my $select = sprintf ('%s( %s )%s',
+ $self->_sqlcase($func),
+ $rhs_sql,
+ $as
+ ? sprintf (' %s %s', $self->_sqlcase('as'), $self->_quote ($as) )
+ : ''
+ );
+
+ return ($select, @rhs_bind);
+ }
+ elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) {
+ return @{$$fields};
+ }
+ else {
+ $self->throw_exception( $ref . qq{ unexpected in _recurse_fields()} );
+ }
+}
+
+
+# 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 more 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 $sql = '';
+
+ if ($arg->{group_by}) {
+ if ( my ($group_sql, @group_bind) = $self->_recurse_fields($arg->{group_by}) ) {
+ $sql .= $self->_sqlcase(' group by ') . $group_sql;
+ push @{$self->{group_bind}}, @group_bind;
+ }
+ }
+
+ 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});
+ }
+
+ 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) = $self->next::method($arg);
+ push @{$self->{order_bind}}, @bind;
+ return $sql;
+ }
+}
+
+sub _split_order_chunk {
+ my ($self, $chunk) = @_;
+
+ # strip off sort modifiers, but always succeed, so $1 gets reset
+ $chunk =~ s/ (?: \s+ (ASC|DESC) )? \s* $//ix;
+
+ return (
+ $chunk,
+ ( $1 and uc($1) eq 'DESC' ) ? 1 : 0,
+ );
+}
+
+sub _table {
+# optimized due to hotttnesss
+# my ($self, $from) = @_;
+ if (my $ref = ref $_[1] ) {
+ if ($ref eq 'ARRAY') {
+ return $_[0]->_recurse_from(@{$_[1]});
+ }
+ elsif ($ref eq 'HASH') {
+ return $_[0]->_recurse_from($_[1]);
+ }
+ elsif ($ref eq 'REF' && ref ${$_[1]} eq 'ARRAY') {
+ my ($sql, @bind) = @{ ${$_[1]} };
+ push @{$_[0]->{from_bind}}, @bind;
+ return $sql
+ }
+ }
+ return $_[0]->next::method ($_[1]);
+}
+
+sub _generate_join_clause {
+ my ($self, $join_type) = @_;
+
+ $join_type = $self->{_default_jointype}
+ if ! defined $join_type;
+
+ return sprintf ('%s JOIN ',
+ $join_type ? $self->_sqlcase($join_type) : ''
+ );
+}
+
+sub _recurse_from {
+ my $self = shift;
+ return join (' ', $self->_gen_from_blocks(@_) );
+}
+
+sub _gen_from_blocks {
+ my ($self, $from, @joins) = @_;
+
+ my @fchunks = $self->_from_chunk_to_sql($from);
+
+ for (@joins) {
+ my ($to, $on) = @$_;
+
+ # 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;
+ }
+
+ my @j = $self->_generate_join_clause( $join_type );
+
+ if (ref $to eq 'ARRAY') {
+ push(@j, '(', $self->_recurse_from(@$to), ')');
+ }
+ else {
+ push(@j, $self->_from_chunk_to_sql($to));
+ }
+
+ my ($sql, @bind) = $self->_join_condition($on);
+ push(@j, ' ON ', $sql);
+ push @{$self->{from_bind}}, @bind;
+
+ push @fchunks, join '', @j;
+ }
+
+ return @fchunks;
+}
+
+sub _from_chunk_to_sql {
+ my ($self, $fromspec) = @_;
+
+ return join (' ', do {
+ if (! ref $fromspec) {
+ $self->_quote($fromspec);
+ }
+ elsif (ref $fromspec eq 'SCALAR') {
+ $$fromspec;
+ }
+ elsif (ref $fromspec eq 'REF' and ref $$fromspec eq 'ARRAY') {
+ push @{$self->{from_bind}}, @{$$fromspec}[1..$#$$fromspec];
+ $$fromspec->[0];
+ }
+ elsif (ref $fromspec eq 'HASH') {
+ my ($as, $table, $toomuch) = ( map
+ { $_ => $fromspec->{$_} }
+ ( grep { $_ !~ /^\-/ } keys %$fromspec )
+ );
+
+ $self->throw_exception( "Only one table/as pair expected in from-spec but an exra '$toomuch' key present" )
+ if defined $toomuch;
+
+ ($self->_from_chunk_to_sql($table), $self->_quote($as) );
+ }
+ else {
+ $self->throw_exception('Unsupported from refkind: ' . ref $fromspec );
+ }
+ });
+}
+
+sub _join_condition {
+ my ($self, $cond) = @_;
+
+ # Backcompat for the old days when a plain hashref
+ # { 't1.col1' => 't2.col2' } meant ON t1.col1 = t2.col2
+ if (
+ ref $cond eq 'HASH'
+ and
+ keys %$cond == 1
+ and
+ (keys %$cond)[0] =~ /\./
+ and
+ ! ref ( (values %$cond)[0] )
+ ) {
+ carp_unique(
+ "ResultSet {from} structures with conditions not conforming to the "
+ . "SQL::Abstract syntax are deprecated: you either need to stop abusing "
+ . "{from} altogether, or express the condition properly using the "
+ . "{ -ident => ... } operator"
+ );
+ $cond = { keys %$cond => { -ident => values %$cond } }
+ }
+ elsif ( ref $cond eq 'ARRAY' ) {
+ # do our own ORing so that the hashref-shim above is invoked
+ my @parts;
+ my @binds;
+ foreach my $c (@$cond) {
+ my ($sql, @bind) = $self->_join_condition($c);
+ push @binds, @bind;
+ push @parts, $sql;
+ }
+ return join(' OR ', @parts), @binds;
+ }
+
+ return $self->_recurse_where($cond);
+}
+
+# This is hideously ugly, but SQLA does not understand multicol IN expressions
+# FIXME TEMPORARY - DQ should have native syntax for this
+# moved here to raise API questions
+#
+# !!! EXPERIMENTAL API !!! WILL CHANGE !!!
+sub _where_op_multicolumn_in {
+ my ($self, $lhs, $rhs) = @_;
+
+ if (! ref $lhs or ref $lhs eq 'ARRAY') {
+ my (@sql, @bind);
+ for (ref $lhs ? @$lhs : $lhs) {
+ if (! ref $_) {
+ push @sql, $self->_quote($_);
+ }
+ elsif (ref $_ eq 'SCALAR') {
+ push @sql, $$_;
+ }
+ elsif (ref $_ eq 'REF' and ref $$_ eq 'ARRAY') {
+ my ($s, @b) = @$$_;
+ push @sql, $s;
+ push @bind, @b;
+ }
+ else {
+ $self->throw_exception("ARRAY of @{[ ref $_ ]}es unsupported for multicolumn IN lhs...");
+ }
+ }
+ $lhs = \[ join(', ', @sql), @bind];
+ }
+ elsif (ref $lhs eq 'SCALAR') {
+ $lhs = \[ $$lhs ];
+ }
+ elsif (ref $lhs eq 'REF' and ref $$lhs eq 'ARRAY' ) {
+ # noop
+ }
+ else {
+ $self->throw_exception( ref($lhs) . "es unsupported for multicolumn IN lhs...");
+ }
+
+ # is this proper...?
+ $rhs = \[ $self->_recurse_where($rhs) ];
+
+ for ($lhs, $rhs) {
+ $$_->[0] = "( $$_->[0] )"
+ unless $$_->[0] =~ /^ \s* \( .* \) \s* $/xs;
+ }
+
+ \[ join( ' IN ', shift @$$lhs, shift @$$rhs ), @$$lhs, @$$rhs ];
+}
+
+=head1 FURTHER QUESTIONS?
+
+Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
+
+=head1 COPYRIGHT AND LICENSE
+
+This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
+by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
+redistribute it and/or modify it under the same terms as the
+L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
+
+=cut
+
+1;
projects / scpubgit/Q-Branch.git / blobdiff