private List<List<String>> parseSql(String entityStr) {
        List<List<String>> entityLists = new ArrayList<List<String>>();
        String[] ss = entityStr.split(",");
        for (String s : ss) {
            List<String> entityList = new ArrayList<String>();
            if (s.contains(" AS ")) {
                String[] strs = s.split(" AS ");
                entityList.add(strs[0].trim());
                entityList.add(strs[1].trim().replace("\"", ""));
            } else {
                String strField;
                if (s.contains(".")) {
                    // 这里不能直接对.进行分割，必须加上\\.才行
                    strField = s.split("\\.")[1].trim();
                } else {
                    strField = s.trim();
                }
                entityList.add(strField);
                entityList.add(strField);
            }
            entityLists.add(entityList);
        }
        return entityLists;
    }