Switch to RowNumberOver for MSSQL

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / SQLAHacks / MSSQL.pm

diff --git a/lib/DBIx/Class/SQLAHacks/MSSQL.pm b/lib/DBIx/Class/SQLAHacks/MSSQL.pm
index 1b18b1e..6110c8d 100644 (file)
--- a/lib/DBIx/Class/SQLAHacks/MSSQL.pm
+++ b/lib/DBIx/Class/SQLAHacks/MSSQL.pm
@@ -4,30 +4,13 @@ package # Hide from PAUSE
 use base qw( DBIx::Class::SQLAHacks );
 use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/;
 
-#
-# MSSQL is retarded wrt TOP (crappy limit) and ordering.
-# One needs to add a TOP to *all* ordered subqueries, if
-# TOP has been used in the statement at least once.
-# Do it here.
-#
-sub select {
-  my $self = shift;
-
-  my ($sql, @bind) = $self->SUPER::select (@_);
-
-  # ordering was requested and there are at least 2 SELECT/FROM pairs
-  # (thus subquery), and there is no TOP specified
-  if (
-    $sql =~ /\bSELECT\b .+? \bFROM\b .+? \bSELECT\b .+? \bFROM\b/isx
-      &&
-    $sql !~ /^ \s* SELECT \s+ TOP \s+ \d+ /xi
-      &&
-    scalar $self->_order_by_chunks ($_[3]->{order_by})
-  ) {
-    $sql =~ s/^ \s* SELECT \s/SELECT TOP 100 PERCENT /xi;
-  }
-
-  return wantarray ? ($sql, @bind) : $sql;
+sub _RowNumberOver {
+   my $self = shift;
+   my $sql  =  $self->SUPER::_RowNumberOver(@_);
+   $sql =~ s/(\s*)SELECT\s Q1\.\*,\s ROW_NUMBER\(\)\s OVER\(\s \)\s AS\s ROW_NUM\s
+             FROM\s \(\n(\s*.*)\n\s*(.*)\n\s*\)\s Q1
+             /$1SELECT Q1.*, ROW_NUMBER() OVER($3) AS ROW_NUM FROM (\n$2\n) Q1/ixm;
+   return $sql;
 }
 
 1;