code: protected void parseElse() {
  		int pos = sql.indexOf("ELSE", position) + 4;
  		String elseToken = sql.substring(position, pos);
  		token = elseToken;
  		nextTokenType = TokenType.SQL;
  		position = position + elseToken.length();
  		tokenType = TokenType.ELSE;
  	}
docs: ELSE文解析