package # Hide from PAUSE
- DBIx::Class::SQLAHacks; # Would merge upstream, but nate doesn't reply :(
+ 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 Carp::Clan qw/^DBIx::Class/;
+use strict;
+use warnings;
+use List::Util 'first';
+use Sub::Name 'subname';
+use namespace::clean;
+use Carp::Clan qw/^DBIx::Class|^SQL::Abstract|^Try::Tiny/;
+
+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::$f"} = subname "SQL::Abstract::$f" =>
+ sub {
+ if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) {
+ __PACKAGE__->can($f)->(@_);
+ }
+ else {
+ goto $orig;
+ }
+ };
+ }
+}
+# the "oh noes offset/top without limit" constant
+# limited to 32 bits for sanity (and since it is fed
+# to sprintf %u)
+sub __max_int { 0xFFFFFFFF };
+
+
+# Tries to determine limit dialect.
+#
sub new {
my $self = shift->SUPER::new(@_);
$self;
}
+# !!! THIS IS ALSO HORRIFIC !!! /me ashamed
+#
+# Generates inner/outer select lists for various limit dialects
+# which result in one or more subqueries (e.g. RNO, Top, RowNum)
+# Any non-root-table columns need to have their table qualifier
+# turned into a column alias (otherwise names in subqueries clash
+# and/or lose their source table)
+#
+# Returns inner/outer strings of SQL QUOTED selectors with aliases
+# (to be used in whatever select statement), and an alias index hashref
+# of QUOTED SEL => QUOTED ALIAS pairs (to maybe be used for string-subst
+# higher up).
+# If an order_by is supplied, the inner select needs to bring out columns
+# used in implicit (non-selected) orders, and the order condition itself
+# needs to be realiased to the proper names in the outer query. Thus we
+# also return a hashref (order doesn't matter) of QUOTED EXTRA-SEL =>
+# QUOTED ALIAS pairs, which is a list of extra selectors that do *not*
+# exist in the original select list
+
+sub _subqueried_limit_attrs {
+ my ($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;
-# 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
+ # 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->{$1}++;
+ }
+ }
-sub _strip_outer_paren {
- my ($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
- },
- });
-}
-
-sub __strip_outer_paren {
- my $sql = shift;
-
- if ($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 as it is necessary
+ # for possible further chaining)
+ my (@in_sel, @out_sel, %renamed);
+ for my $node (@sel) {
+ if (first { $_ =~ / (?<! ^ $re_alias ) $re_sep /x } ($node->{as}, $node->{unquoted_sql}) ) {
+ $node->{as} = $self->_unqualify_colname($node->{as});
+ 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 : (),
+ );
+}
+
+sub _unqualify_colname {
+ my ($self, $fqcn) = @_;
+ my $re_sep = quotemeta($self->name_sep || '.');
+ $fqcn =~ s/ $re_sep /__/xg;
+ return $fqcn;
+}
+
+# ANSI standard Limit/Offset implementation. DB2 and MSSQL >= 2005 use this
+sub _RowNumberOver {
+ my ($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 $sql;
}
-sub _where_field_IN {
- my ($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 %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, $offset ) = @_;
-# DB2 is the only remaining DB using this. Even though we are not sure if
-# RowNumberOver is still needed here (should be part of SQLA) leave the
-# code in place
-sub _RowNumberOver {
- my ($self, $sql, $order, $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 for Sybase ASE, to use SET ROWCOUNT when there is no offset, and
+# GenericSubQ otherwise.
+sub _RowCountOrGenericSubQ {
+ my $self = shift;
+ my ($sql, $rs_attrs, $rows, $offset) = @_;
+
+ return $self->_GenericSubQ(@_) if $offset;
+
+ return sprintf <<"EOF", $rows, $sql;
+SET ROWCOUNT %d
+%s
+SET ROWCOUNT 0
+EOF
+}
+
+# This is the most evil limit "dialect" (more of a hack) for *really*
+# stupid databases. It works by ordering the set by some unique column,
+# and calculating amount of rows that have a less-er value (thus
+# emulating a RowNum-like index). Of course this implies the set can
+# only be ordered by a single unique columns.
+sub _GenericSubQ {
+ my ($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]
+ );
- $offset += 1;
- my $last = $rows + $offset;
- my ( $order_by ) = $self->_order_by( $order );
+ my $ord_colinfo = $inf->{$order_by} || croak "Unable to determine source of order-criteria '$order_by'";
- $sql = <<"SQL";
-SELECT * FROM
-(
- SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM (
- $sql
- $order_by
- ) Q1
-) Q2
-WHERE ROW_NUM BETWEEN $offset AND $last
+ if ($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}\./;
-SQL
+ 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_sql = $self->_order_by (delete $rs_attrs->{order_by});
+ my $group_having_sql = $self->_parse_rs_attrs($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 ${sql}${group_having_sql}
+ ) %s
+WHERE ( SELECT COUNT(*) FROM %s %s WHERE %s $cmp_op %s ) %s
+$order_sql
+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 $sql;
}
# While we're at it, this should make LIMIT queries more efficient,
# without digging into things too deeply
-use Scalar::Util 'blessed';
sub _find_syntax {
my ($self, $syntax) = @_;
-
- # 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
- my $dbhname = blessed($syntax) ? $syntax->{Driver}{Name} : $syntax;
- if(ref($self) && $dbhname && $dbhname eq 'DB2') {
- return 'RowNumberOver';
- }
-
- $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($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, $order, @rest) = @_;
- local $self->{having_bind} = [];
- local $self->{from_bind} = [];
+ my ($self, $table, $fields, $where, $rs_attrs, @rest) = @_;
- if (ref $table eq 'SCALAR') {
- $table = $$table;
- }
- elsif (not ref $table) {
+ if (not ref($table) or ref($table) eq 'SCALAR') {
$table = $self->_quote($table);
}
- local $self->{rownum_hack_count} = 1
- if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum');
+
@rest = (-1) unless defined $rest[0];
- die "LIMIT 0 Does Not Compute" if $rest[0] == 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
+
+ my ($sql, @bind) = $self->SUPER::select(
+ $table, $self->_recurse_fields($fields), $where, $rs_attrs, @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;
+ push @{$self->{where_bind}}, @bind;
+
+# this *must* be called, otherwise extra binds will remain in the sql-maker
+ my @all_bind = $self->_assemble_binds;
+
+ return wantarray ? ($sql, @all_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) unless ref($table);
+ $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) unless ref($table);
+ $table = $self->_quote($table);
$self->SUPER::update($table, @_);
}
+# Just quotes table names.
sub delete {
my $self = shift;
my $table = shift;
- $table = $self->_quote($table) unless ref($table);
+ $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->_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}++
- : '')
- } @$fields);
- } elsif ($ref eq 'HASH') {
- foreach my $func (keys %$fields) {
- if ($func eq 'distinct') {
- my $_fields = $fields->{$func};
- if (ref $_fields eq 'ARRAY' && @{$_fields} > 1) {
- die "Unsupported syntax, please use " .
- "{ group_by => [ qw/" . (join ' ', @$_fields) . "/ ] }" .
- " or " .
- "{ select => [ qw/" . (join ' ', @$_fields) . "/ ], distinct => 1 }";
- }
- else {
- $_fields = @{$_fields}[0] if ref $_fields eq 'ARRAY';
- carp "This syntax will be deprecated in 09, please use " .
- "{ group_by => '${_fields}' }" .
- " or " .
- "{ select => '${_fields}', distinct => 1 }";
- }
- }
-
- return $self->_sqlcase($func)
- .'( '.$self->_recurse_fields($fields->{$func}).' )';
+ 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 {
- Carp::croak($ref . qq{ unexpected in _recurse_fields()})
+ 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 = shift;
- my $ret = '';
- my @extra;
- if (ref $_[0] eq 'HASH') {
- if (defined $_[0]->{group_by}) {
- $ret = $self->_sqlcase(' group by ')
- .$self->_recurse_fields($_[0]->{group_by}, { no_rownum_hack => 1 });
- }
- if (defined $_[0]->{having}) {
- my $frag;
- ($frag, @extra) = $self->_recurse_where($_[0]->{having});
- push(@{$self->{having_bind}}, @extra);
- $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(@_);
+ 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;
}
- return $ret;
}
sub _order_directions {
my ($self, $order) = @_;
- $order = $order->{order_by} if ref $order eq 'HASH';
- return $self->SUPER::_order_directions($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 {
}
}
+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;
foreach my $j (@join) {
my ($to, $on) = @$j;
+
# check whether a join type exists
- my $join_clause = '';
my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to;
- if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) {
- $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN ';
- } else {
- $join_clause = ' JOIN ';
+ 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;
}
- push(@sqlf, $join_clause);
+
+ $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), ')');
sub _fold_sqlbind {
my ($self, $sqlbind) = @_;
- my $sql = shift @$$sqlbind;
- push @{$self->{from_bind}}, @$$sqlbind;
+
+ my @sqlbind = @$$sqlbind; # copy
+ my $sql = shift @sqlbind;
+ push @{$self->{from_bind}}, @sqlbind;
+
return $sql;
}
for (keys %$cond) {
my $v = $cond->{$_};
if (ref $v) {
- # XXX no throw_exception() in this package and croak() fails with strange results
- Carp::croak(ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'})
+ croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'})
if ref($v) ne 'SCALAR';
$j{$_} = $v;
}
} elsif (ref $cond eq 'ARRAY') {
return join(' OR ', map { $self->_join_condition($_) } @$cond);
} else {
- die "Can't handle this yet!";
- }
-}
-
-sub _quote {
- my ($self, $label) = @_;
- return '' unless defined $label;
- 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));
+ croak "Can't handle this yet!";
}
- 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};
}
+# 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};
}
+# Character separating quoted table names.
sub name_sep {
my $self = shift;
$self->{name_sep} = shift if @_;
}
1;
-
-__END__
-
-=pod
-
-=head1 NAME
-
-DBIx::Class::SQLAHacks - Things desired to be merged into SQL::Abstract
-
-=head1 METHODS
-
-=head2 new
-
-Tries to determine limit dialect.
-
-=head2 select
-
-Quotes table names, handles "limit" dialects (e.g. where rownum between x and
-y), supports SELECT ... FOR UPDATE and SELECT ... FOR SHARE.
-
-=head2 insert update delete
-
-Just quotes table names.
-
-=head2 limit_dialect
-
-Specifies the dialect of used for implementing an SQL "limit" clause for
-restricting the number of query results returned. Valid values are: RowNum.
-
-See L<DBIx::Class::Storage::DBI/connect_info> for details.
-
-=head2 name_sep
-
-Character separating quoted table names.
-
-See L<DBIx::Class::Storage::DBI/connect_info> for details.
-
-=head2 quote_char
-
-Set to an array-ref to specify separate left and right quotes for table names.
-
-See L<DBIx::Class::Storage::DBI/connect_info> for details.
-
-=cut
-
projects / dbsrgits/DBIx-Class.git / blobdiff