protected function buildOnDup()/*# : array */
    {
        $result = [];
        foreach ($this->clause_ondup as $col => $expr) {
            $result[] = $col . ' = ' . $expr;
        }
        return $result;
    }
protected function buildOnDup()/*# : array */
    {
        $result = [];
        foreach ($this->clause_ondup as $col => $expr) {
            $result[] = $col . ' = ' . $expr;
        }
        return $result;
    }
protected function buildOnDup ( ) /*# : array */ { $ result = [ ] ; foreach ( $ this -> clause_ondup as $ col => $ expr ) { $ result [ ] = $ col . ' = ' . $ expr ; } return $ result ; }
Build ON DUP

@return array
@access protected
Build ON DUP