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/;
+# This module is a subclass of SQL::Abstract and includes a number of
+# DBIC-specific workarounds, not yet suitable for inclusion into the
+# SQLA core.
+# It also provides all (and more than) the functionality of
+# SQL::Abstract::Limit, which proved to be very hard to keep updated
+
+use base qw/
+ SQL::Abstract
+ Class::Accessor::Grouped
+/;
+use mro 'c3';
use strict;
use warnings;
use List::Util 'first';
use Carp::Clan qw/^DBIx::Class|^SQL::Abstract|^Try::Tiny/;
use namespace::clean;
+__PACKAGE__->mk_group_accessors (simple => qw/quote_char name_sep limit_dialect/);
+
BEGIN {
# reinstall the carp()/croak() functions imported into SQL::Abstract
# as Carp and Carp::Clan do not like each other much
}
# the "oh noes offset/top without limit" constant
-# limited to 32 bits for sanity (and since it is fed
-# to sprintf %u)
+# limited to 32 bits for sanity (and consistency,
+# since it is ultimately handed to sprintf %u)
+# 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 { 0xFFFFFFFF };
-
-# 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
return $fqcn;
}
+#
+# Follow limit dialect implementations
+#
+
+# PostgreSQL and SQLite
+sub _LimitOffset {
+ my ( $self, $sql, $order, $rows, $offset ) = @_;
+ $sql .= $self->_order_by( $order ) . " LIMIT $rows";
+ $sql .= " OFFSET $offset" if +$offset;
+ return $sql;
+}
+
+# MySQL and any SQL::Statement based DBD
+sub _LimitXY {
+ my ( $self, $sql, $order, $rows, $offset ) = @_;
+ $sql .= $self->_order_by( $order ) . " LIMIT ";
+ $sql .= "$offset, " if +$offset;
+ $sql .= $rows;
+ return $sql;
+}
+
# ANSI standard Limit/Offset implementation. DB2 and MSSQL >= 2005 use this
sub _RowNumberOver {
my ($self, $sql, $rs_attrs, $rows, $offset ) = @_;
}
# Informix specific limit, almost like LIMIT/OFFSET
+# According to SQLA::Limit informix also supports
+# SKIP X LIMIT Y (in addition to SKIP X FIRST Y)
sub _SkipFirst {
my ($self, $sql, $rs_attrs, $rows, $offset) = @_;
}
# Firebird specific limit, reverse of _SkipFirst for Informix
+# According to SQLA::Limit firebird/interbase also supports
+# ROWS X TO Y (in addition to FIRST X SKIP Y)
sub _FirstSkip {
my ($self, $sql, $rs_attrs, $rows, $offset) = @_;
return $sql;
}
+#
+# Actual SQL::Abstract overrid^Whacks
+#
-# While we're at it, this should make LIMIT queries more efficient,
-# without digging into things too deeply
-sub _find_syntax {
- my ($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)
+# Handle limit-dialect selection
sub select {
- my ($self, $table, $fields, $where, $rs_attrs, @rest) = @_;
+ my ($self, $table, $fields, $where, $rs_attrs, $limit, $offset) = @_;
+
+
+ $fields = $self->_recurse_fields($fields);
+
+ if (defined $offset) {
+ croak ('A supplied offset must be a non-negative integer')
+ if ( $offset =~ /\D/ or $offset < 0 );
+ }
+ $offset ||= 0;
- if (not ref($table) or ref($table) eq 'SCALAR') {
- $table = $self->_quote($table);
+ if (defined $limit) {
+ croak ('A supplied limit must be a positive integer')
+ if ( $limit =~ /\D/ or $limit <= 0 );
+ }
+ elsif ($offset) {
+ $limit = $self->__max_int;
}
- @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, @bind) = $self->SUPER::select(
- $table, $self->_recurse_fields($fields), $where, $rs_attrs, @rest
- );
+ my ($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 =
+ $self->can ('emulate_limit') # also backcompat hook from SQLA::Limit
+ ||
+ do {
+ my $dialect = $self->limit_dialect
+ or croak "Unable to generate SQL-limit - no limit dialect specified on $self, and no emulate_limit method found";
+ $self->can ("_$dialect")
+ or croak "SQLAHacks does not implement the requested dialect '$dialect'";
+ }
+ ;
+
+ $sql = $self->$limiter ($sql, $rs_attrs, $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
return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/from where having order/);
}
-# Quotes table names, and handles default inserts
+# Handle default inserts
sub insert {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table);
+# 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 (! $_[0] or (ref $_[0] eq 'HASH' and !keys %{$_[0]} ) ) {
- my $sql = "INSERT INTO ${table} DEFAULT VALUES";
+ if (! $_[2] or (ref $_[2] eq 'HASH' and !keys %{$_[2]} ) ) {
+ my $sql = "INSERT INTO $_[1] DEFAULT VALUES";
- if (my $ret = ($_[1]||{})->{returning} ) {
- $sql .= $self->_insert_returning ($ret);
+ if (my $ret = ($_[3]||{})->{returning} ) {
+ $sql .= $_[0]->_insert_returning ($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(@_);
- }
+ next::method(@_);
}
sub _recurse_fields {
return $self->_parse_rs_attrs ($arg);
}
else {
- my ($sql, @bind) = $self->SUPER::_order_by ($arg);
+ my ($sql, @bind) = $self->next::method($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
+# 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 $_[0]->_make_as($_[1]);
+ }
}
+
+ return $_[0]->next::method ($_[1]);
}
sub _generate_join_clause {
}
}
-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};
-}
-
-# Character separating quoted table names.
-sub name_sep {
- my $self = shift;
- $self->{name_sep} = shift if @_;
- return $self->{name_sep};
-}
1;
projects / dbsrgits/DBIx-Class.git / blobdiff