moved sql related code to its own engine area

Conflicts:

	lib/arel/engine.rb
	lib/arel/extensions/object.rb
	lib/arel/predicates.rb
	lib/arel/primitives/attribute.rb
	lib/arel/primitives/expression.rb
	lib/arel/primitives/value.rb
	lib/arel/relations/operations/join.rb
	lib/arel/relations/relation.rb
	lib/arel/relations/utilities/externalization.rb
	lib/arel/relations/utilities/nil.rb
	lib/arel/relations/writes/delete.rb
	lib/arel/relations/writes/insert.rb
	lib/arel/relations/writes/update.rb
	spec/arel/unit/relations/skip_spec.rb
	spec/arel/unit/relations/take_spec.rb
	spec/spec_helper.rb

3 files changed, 0 insertions, 29 deletions

diff --git a/lib/arel/relations/writes/delete.rb b/lib/arel/relations/writes/delete.rb
index 0a04454e7f..a94067c7fa 100644
--- a/lib/arel/relations/writes/delete.rb
+++ b/lib/arel/relations/writes/delete.rb
@@ -3,15 +3,6 @@ module Arel
     attributes :relation
     deriving :initialize, :==
 
-    def to_sql(formatter = nil)
-      [
-        "DELETE",
-        "FROM #{table_sql}",
-        ("WHERE #{wheres.collect(&:to_sql).join('\n\tAND ')}" unless wheres.blank?  ),
-        ("LIMIT #{taken}"                                     unless taken.blank?    ),
-      ].compact.join("\n")
-    end
-
     def call
       engine.delete(self)
     end
diff --git a/lib/arel/relations/writes/insert.rb b/lib/arel/relations/writes/insert.rb
index d05bd9cdc8..6d85e9769a 100644
--- a/lib/arel/relations/writes/insert.rb
+++ b/lib/arel/relations/writes/insert.rb
@@ -7,15 +7,6 @@ module Arel
       @relation, @record = relation, record.bind(relation)
     end
 
-    def to_sql(formatter = nil)
-      [
-        "INSERT",
-        "INTO #{table_sql}",
-        "(#{record.keys.map { |key| engine.quote_column_name(key.name) }.join(', ')})",
-        "VALUES (#{record.map { |key, value| key.format(value) }.join(', ')})"
-      ].join("\n")
-    end
-
     def call
       engine.create(self)
     end
diff --git a/lib/arel/relations/writes/update.rb b/lib/arel/relations/writes/update.rb
index fd0aadb479..e647218a80 100644
--- a/lib/arel/relations/writes/update.rb
+++ b/lib/arel/relations/writes/update.rb
@@ -7,17 +7,6 @@ module Arel
       @relation, @assignments = relation, assignments
     end
 
-    def to_sql(formatter = nil)
-      [
-        "UPDATE #{table_sql} SET",
-        assignments.collect do |attribute, value|
-          "#{engine.quote_column_name(attribute.name)} = #{attribute.format(value)}"
-        end.join(",\n"),
-        ("WHERE #{wheres.map(&:to_sql).join('\n\tAND ')}"  unless wheres.blank?  ),
-        ("LIMIT #{taken}"                                      unless taken.blank?    )
-      ].join("\n")
-    end
-
     def call
       engine.update(self)
     end