/**
  * Get the singleton instance
  *
  * @return BizDataObj_SQLHelper BizDataObj_SQLHelper object
  */
 public static function instance()
 {
     if (self::$_instance == null) {
         self::$_instance = new BizDataObj_SQLHelper();
     }
     return self::$_instance;
 }
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 /**
  * Get SQL helper
  *
  * @return BizDataObj_SQLHelper
  */
 protected function getSQLHelper()
 {
     return BizDataObj_SQLHelper::instance();
 }