+++ /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 / commitdiff