Stop using OFFSET in DB queries of phpBB3 importer

http://use-the-index-luke.com/no-offset

script/import_scripts/phpbb3/database/database_base.rb

@@ -12,13 +12,36 @@ module ImportScripts::PhpBB3
     protected
 
     # Executes a database query.
-    def query(sql)
-      @database_client.query(sql, cache_rows: true, symbolize_keys: true)
+    def query(sql, *last_columns)
+      rows = @database_client.query(sql, cache_rows: true, symbolize_keys: true)
+      return rows if last_columns.length == 0
+
+      result = [rows]
+      last_row = find_last_row(rows)
+
+      last_columns.each { |column| result.push(last_row ? last_row[column] : nil) }
+      result
     end
 
     # Executes a database query and returns the value of the 'count' column.
     def count(sql)
       query(sql).first[:count]
     end
+
+    def escape(value)
+      @database_client.escape(value)
+    end
+
+    private
+
+    def find_last_row(rows)
+      last_index = rows.size - 1
+
+      rows.each_with_index do |row, index|
+        return row if index == last_index
+      end
+
+      nil
+    end
   end
 end