diff --git a/db/migrate/20140120155706_add_lounge_category.rb b/db/migrate/20140120155706_add_lounge_category.rb
index e67ae7de7a7..140d0856ed9 100644
--- a/db/migrate/20140120155706_add_lounge_category.rb
+++ b/db/migrate/20140120155706_add_lounge_category.rb
@@ -12,15 +12,19 @@ class AddLoungeCategory < ActiveRecord::Migration
           "CHANGE_ME"
         end
 
-        result = execute "INSERT INTO categories
+        result = Category.exec_sql "INSERT INTO categories
                         (name, color, text_color, created_at, updated_at, user_id, slug, description, read_restricted, position)
-                 VALUES ('#{name}', 'EEEEEE', '652D90', now(), now(), -1, '', '#{description}', true, 3)
-                 RETURNING id"
+                 VALUES (:name, 'EEEEEE', '652D90', now(), now(), -1, '', :description, true, 3)
+                 RETURNING id", name: name, description: description
+
         category_id = result[0]["id"].to_i
 
-        execute "UPDATE categories SET slug='#{Slug.for(name, "#{category_id}-category")}' WHERE id=#{category_id}"
+        Category.exec_sql "UPDATE categories SET slug = :slug
+                          WHERE id = :category_id",
+                          slug: Slug.for(name, "#{category_id}-category"), category_id: category_id
+
         execute "INSERT INTO site_settings(name, data_type, value, created_at, updated_at)
-                 VALUES ('lounge_category_id', 3, #{category_id}, now(), now())"
+                 VALUES ('lounge_category_id', 3, #{category_id.to_i}, now(), now())"
       end
     end
   end
diff --git a/db/migrate/20140122043508_add_meta_category.rb b/db/migrate/20140122043508_add_meta_category.rb
index aa128bd7d83..ae63c48edb1 100644
--- a/db/migrate/20140122043508_add_meta_category.rb
+++ b/db/migrate/20140122043508_add_meta_category.rb
@@ -14,7 +14,9 @@ class AddMetaCategory < ActiveRecord::Migration
 
           category_id = result[0]["id"].to_i
 
-          execute "UPDATE categories SET slug='#{Slug.for(name, "#{category_id}-category")}' WHERE id=#{category_id}"
+          Category.exec_sql "UPDATE categories SET slug=:slug WHERE id=:category_id",
+                    slug: Slug.for(name, "#{category_id}-category"), category_id: category_id
+
           execute "INSERT INTO site_settings(name, data_type, value, created_at, updated_at)
                    VALUES ('meta_category_id', 3, #{category_id}, now(), now())"
         end
diff --git a/db/migrate/20140227201005_add_staff_category.rb b/db/migrate/20140227201005_add_staff_category.rb
index 6771fd978ef..74d96405b75 100644
--- a/db/migrate/20140227201005_add_staff_category.rb
+++ b/db/migrate/20140227201005_add_staff_category.rb
@@ -5,16 +5,21 @@ class AddStaffCategory < ActiveRecord::Migration
       if result.count == 0
         description = I18n.t('staff_category_description')
         name = I18n.t('staff_category_name')
-        if Category.exec_sql("SELECT 1 FROM categories where name ilike '#{name}'").count == 0
-          result = execute "INSERT INTO categories
+
+        if Category.exec_sql("SELECT 1 FROM categories where name ilike :name", name: name).count == 0
+
+          result = Category.exec_sql "INSERT INTO categories
                           (name, color, text_color, created_at, updated_at, user_id, slug, description, read_restricted, position)
-                   VALUES ('#{name}', '283890', 'FFFFFF', now(), now(), -1, '', '#{description}', true, 2)
-                   RETURNING id"
+                   VALUES (:name, '283890', 'FFFFFF', now(), now(), -1, '', :description, true, 2)
+                   RETURNING id", name: name, description: description
+
           category_id = result[0]["id"].to_i
 
-          execute "UPDATE categories SET slug='#{Slug.for(name, "#{category_id}-category")}' WHERE id=#{category_id}"
+          Category.exec_sql "UPDATE categories SET slug=:slug WHERE id=:category_id",
+                  slug: Slug.for(name, "#{category_id}-category"), category_id: category_id
+
           execute "INSERT INTO site_settings(name, data_type, value, created_at, updated_at)
-                   VALUES ('staff_category_id', 3, #{category_id}, now(), now())"
+                   VALUES ('staff_category_id', 3, #{category_id.to_i}, now(), now())"
         end
       end
     end