Superset實現(xiàn)動態(tài)SQL查詢功能

更新時間：2021年08月09日 11:50:19 作者：數(shù)據行者

這篇文章給大家介紹使用自定義參數(shù)方式實現(xiàn) superset 實現(xiàn)SQL動態(tài)查詢功能，本文通過實例代碼給大家介紹的非常詳細，對大家的學習或工作具有一定的參考借鑒價值，需要的朋友參考下吧

使用自定義參數(shù)方式實現(xiàn) superset 實現(xiàn)SQL動態(tài)查詢

1、啟用參數(shù)：config.py 設置"ENABLE_TEMPLATE_PROCESSING": True

2、當前superset v1.2版本支持的參數(shù)包括：

{{ current_username() }} 當前登錄用戶名
{{ current_username(add_to_cache_keys=False) }} 不從緩存中獲取登錄用戶名，默認從緩存獲取
{{ current_user_id()}} 當前登錄用戶ID
{{ current_user_id(add_to_cache_keys=False) }} 不從緩存中獲取登錄用戶ID，默認從緩存獲取
{{ url_param('custom_variable') }} url 參數(shù)，比如127.0.0.1：8001\dashboard?abc=123，參數(shù)就是{{ url_param('abc') }} 結果就是123
{{ cache_key_wrapper() }} 還沒有弄明白啥用
{{ filter_values("字段名") }} 獲取dashboard filter_box組件對某個字段的篩選結果
{{ from_dttm }} 獲取dashboard filter_box組件日期篩選的開始時間
{{ to_dttm }} 獲取dashboard filter_box組件日期篩選的結束時間
{{ get_filters() }} 暫時沒有弄明白

除此之外，還可以自定義參數(shù)，自定義參數(shù)方法：

①修改superset/jinja_context.py文件，修改三個地方：

regex = re.compile(
        r"\{\{.*("
        r"current_user_id\(.*\)|"
        r"current_username\(.*\)|"
        r"current_userroles\(.*\)|"
        r"isadmin\(.*\)|"
        r"cache_key_wrapper\(.*\)|"
        r"url_param\(.*\)"
        r").*\}\}"
    )

↑↑↑↑注意此處的 current_userroles 和 isadmin 是我自定義的，源文件沒有

def current_user_id(self, add_to_cache_keys: bool = True) -> Optional[int]:
        """
        Return the user ID of the user who is currently logged in.

        :param add_to_cache_keys: Whether the value should be included in the cache key
        :returns: The user ID
        """

        if hasattr(g, "user") and g.user:
            if add_to_cache_keys:
                self.cache_key_wrapper(g.user.get_id())
            return g.user.get_id()
        return None

    def current_username(self, add_to_cache_keys: bool = True) -> Optional[str]:
        """
        Return the username of the user who is currently logged in.

        :param add_to_cache_keys: Whether the value should be included in the cache key
        :returns: The username
        """

        if g.user and hasattr(g.user, "username"):
            if add_to_cache_keys:
                self.cache_key_wrapper(g.user.username)
            return g.user.username
        return None
    def current_userroles(self, add_to_cache_keys: bool = True) -> Optional[str]:
        """
        Return the roles of the user who is currently logged in.

        :param add_to_cache_keys: Whether the value should be included in the cache key
        :returns: The userroles
        """

        if g.user and hasattr(g.user, "roles"):
            if add_to_cache_keys:
                user_roles = "/".join([role.name.lower() for role in list(g.user.roles)])
                self.cache_key_wrapper(user_roles)
                print(user_roles)
                return user_roles
                """admin in user_roles"""
        return None

    def isadmin(self, add_to_cache_keys: bool = True) -> Optional[str]:
        """
        Return the roles of the user who is currently logged in.

        :param add_to_cache_keys: Whether the value should be included in the cache key
        :returns: The userroles
        """

        if g.user and hasattr(g.user, "roles"):
            if add_to_cache_keys:
                user_roles = [role.name.lower() for role in list(g.user.roles)]
                return "admin" in user_roles
        return None

↑↑↑↑仿照系統(tǒng)自帶的 current_username 編造自己的函數(shù)，我寫了current_userroles 和 isadmin

class JinjaTemplateProcessor(BaseTemplateProcessor):
    def set_context(self, **kwargs: Any) -> None:
        super().set_context(**kwargs)
        extra_cache = ExtraCache(self._extra_cache_keys)
        self._context.update(
            {
                "url_param": partial(safe_proxy, extra_cache.url_param),
                "current_user_id": partial(safe_proxy, extra_cache.current_user_id),
                "current_username": partial(safe_proxy, extra_cache.current_username),
                "current_userroles": partial(safe_proxy, extra_cache.current_userroles),
                "isadmin": partial(safe_proxy, extra_cache.isadmin),
                "cache_key_wrapper": partial(safe_proxy, extra_cache.cache_key_wrapper),
                "filter_values": partial(safe_proxy, filter_values),
            }
        )

↑↑↑↑仿照系統(tǒng)自帶的 current_username 編造自己的函數(shù)，我寫了current_userroles 和 isadmin

就是這3個地方，但是注意，自己在第二步早的函數(shù)，返回值必須是：

ALLOWED_TYPES = (
    NONE_TYPE,
    "bool",
    "str",
    "unicode",
    "int",
    "long",
    "float",
    "list",
    "dict",
    "tuple",
    "set",
)

否則會提示錯誤，或者自己修改這個types，我是轉換，比如上面那個g.user.roles 返回的結果就不是上面類型，導致我一直不成功，最后修改了下，才可以

3、判斷是否自定義成功：

在superset sql lab中執(zhí)行如下代碼，如果能被解析，就說明成功

4、應用案例：

在dataset里面，動態(tài)訪問數(shù)據源，數(shù)據源添加where語句：select * from sales where salesname =' {{current_username()}}'

dashboard里面，通過獲取篩選器的結果，然后獲取其他表應當顯示的數(shù)據范圍：

select  DATE,risktype,sum(num) as num from
(SELECT date , customerid,product,risktype ,count(*) as num
from v_superset_forecast_risk group by date , customerid,product,risktype ) a
join
(select distinct customer_code,product from v_superset_access
where name='{{ current_username() }}' )access
on a.customerid=access.customer_code
and a.product=access.product
and DATE_FORMAT(date,'%Y-%m')> DATE_FORMAT(date_sub(STR_TO_DATE(concat( {{ "'" + "', '".join(filter_values('yearmonthend')) + "'" }},'-01'), '%Y-%m-%d'), interval 12 month),'%Y-%m')
and DATE_FORMAT(date,'%Y-%m')<={{ "'" + "', '".join(filter_values('yearmonthend')) + "'" }}
group by DATE,risktype

因為sql里面可以使用jinja 表達式，比如判斷篩選當前沒有篩選的時候，獲取什么數(shù)據