From: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
Date: Thu, 3 Dec 2009 01:48:36 +0000 (+0000)
Subject: Switch to RowNumberOver for MSSQL
X-Git-Tag: v0.08116~103^2~25
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=9d2a1bb56d0b2ce3901280b031db971046958abc;p=dbsrgits%2FDBIx-Class.git

Switch to RowNumberOver for MSSQL
---

diff --git a/lib/DBIx/Class/SQLAHacks/MSSQL.pm b/lib/DBIx/Class/SQLAHacks/MSSQL.pm
index 1b18b1e..6110c8d 100644
--- 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;
diff --git a/lib/DBIx/Class/Storage/DBI/MSSQL.pm b/lib/DBIx/Class/Storage/DBI/MSSQL.pm
index 2db2af7..94597ab 100644
--- a/lib/DBIx/Class/Storage/DBI/MSSQL.pm
+++ b/lib/DBIx/Class/Storage/DBI/MSSQL.pm
@@ -212,7 +212,7 @@ sub _sql_maker_opts {
     $self->{_sql_maker_opts} = { %$opts };
   }
 
-  return { limit_dialect => 'Top', %{$self->{_sql_maker_opts}||{}} };
+  return { limit_dialect => 'RowNumberOver', %{$self->{_sql_maker_opts}||{}} };
 }
 
 1;