X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FSQLAHacks.pm;h=13f0d9714046259ccf23d2006f2b697d1ea7e812;hb=bf27b5863404146820af39c27d3560aafdf8b8d5;hp=3208a766fcde46384395e658022190b5a5fc4035;hpb=6553ac3837081c481ecdf269c7aff407c348a807;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/SQLAHacks.pm b/lib/DBIx/Class/SQLAHacks.pm
index 3208a76..13f0d97 100644
--- a/lib/DBIx/Class/SQLAHacks.pm
+++ b/lib/DBIx/Class/SQLAHacks.pm
@@ -51,19 +51,27 @@ sub new {
 sub _RowNumberOver {
   my ($self, $sql, $order, $rows, $offset ) = @_;
 
+  # get the select to make the final amount of columns equal the original one
+  my ($select) = $sql =~ /^ \s* SELECT \s+ (.+?) \s+ FROM/ix
+    or croak "Unrecognizable SELECT: $sql";
+
   # get the order_by only (or make up an order if none exists)
   my $order_by = $self->_order_by(
-    (delete $order->{order_by}) || \ '(SELECT (1))'
+    (delete $order->{order_by}) || $self->_rno_default_order
   );
 
-  # whatever is left
+  # whatever is left of the order_by
   my $group_having = $self->_order_by($order);
 
-  $sql = sprintf (<<'EOS', $order_by, $sql, $group_having, $offset + 1, $offset + $rows, );
+  my $qalias = $self->_quote ($self->{_dbic_rs_attrs}{alias});
+
+  $sql = sprintf (<<EOS, $offset + 1, $offset + $rows, );
 
-SELECT * FROM (
-  SELECT orig_query.*, ROW_NUMBER() OVER(%s ) AS rno__row__index FROM (%s%s) orig_query
-) rno_subq WHERE rno__row__index BETWEEN %d AND %d
+SELECT $select FROM (
+  SELECT $qalias.*, ROW_NUMBER() OVER($order_by ) AS rno__row__index FROM (
+    ${sql}${group_having}
+  ) $qalias
+) $qalias WHERE rno__row__index BETWEEN %d AND %d
 
 EOS
 
@@ -71,6 +79,47 @@ EOS
   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, $order, $rows, $offset) = @_;
+
+  $sql =~ s/^ \s* SELECT \s+ //ix
+    or croak "Unrecognizable SELECT: $sql";
+
+  return sprintf ('SELECT %s%s%s%s',
+    $offset
+      ? sprintf ('SKIP %d ', $offset)
+      : ''
+    ,
+    sprintf ('FIRST %d ', $rows),
+    $sql,
+    $self->_order_by ($order),
+  );
+}
+
+# Firebird specific limit, reverse of _SkipFirst for Informix
+sub _FirstSkip {
+  my ($self, $sql, $order, $rows, $offset) = @_;
+
+  $sql =~ s/^ \s* SELECT \s+ //ix
+    or croak "Unrecognizable SELECT: $sql";
+
+  return sprintf ('SELECT %s%s%s%s',
+    sprintf ('FIRST %d ', $rows),
+    $offset
+      ? sprintf ('SKIP %d ', $offset)
+      : ''
+    ,
+    $sql,
+    $self->_order_by ($order),
+  );
+}
+
 # Crappy Top based Limit/Offset support. Legacy from MSSQL.
 sub _Top {
   my ( $self, $sql, $order, $rows, $offset ) = @_;
@@ -376,7 +425,7 @@ sub _recurse_fields {
       $self->_sqlcase($func),
       $self->_recurse_fields($args),
       $as
-        ? sprintf (' %s %s', $self->_sqlcase('as'), $as)
+        ? sprintf (' %s %s', $self->_sqlcase('as'), $self->_quote ($as) )
         : ''
     );