jdbcTemplate 泛型 查询

1. dao层方法使用泛型

    public  <T> List<T> findDistinctListByCondition(String str, Class<T> fieldClass) {
        String sql = "select distinct " + str + " from checkin_request";
        List<T> list = (List<T>) jdbcTemplate.query(sql, new RowMapper<Object>(){
            @Override
            public T mapRow(ResultSet rs, int rowNum) throws SQLException {
                
                return (T)rs.getObject(1);
            }
        });
        return list;
    }

2. action调用

        List<Integer> mediatypeList = checkInRequestService.findDistinctListByCondition("mediatype", Integer.class);
        List<String> currentStatusList = checkInRequestService.findDistinctListByCondition("current_status", String.class);