这篇文章给大家介绍使用自定义参数方式实现 superset 实现SQL动态查询功能，本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友参考下吧
使用自定义参数方式实现 superset 实现SQL动态查询
1、启用参数：config.py 设置"ENABLE_TEMPLATE_PROCESSING": True
2、当前superset v1.2版本支持的参数包括：
{{ current_username() }} 当前登录用户名
{{ current_username(add_to_cache_keys=False) }} 不从缓存中获取登录用户名，默认从缓存获取
{{ current_user_id()}} 当前登录用户ID
{{ current_user_id(add_to_cache_keys=False) }} 不从缓存中获取登录用户ID，默认从缓存获取
{{ url_param('custom_variable') }} url 参数，比如127.0.0.1：8001\dashboard?abc=123，参数就是{{ url_param('abc') }} 结果就是123
{{ cache_key_wrapper() }} 还没有弄明白啥用
{{ filter_values("字段名") }} 获取dashboard filter_box组件对某个字段的筛选结果
{{ from_dttm }} 获取dashboard filter_box组件日期筛选的开始时间
{{ to_dttm }} 获取dashboard filter_box组件日期筛选的结束时间
{{ get_filters() }} 暂时没有弄明白
除此之外，还可以自定义参数，自定义参数方法：
①修改superset/jinja_context.py文件，修改三个地方：
regex = re.compile( r"\{\{.*(" r"current_user_id\(.*\)|" r"current_username\(.*\)|" r"current_userroles\(.*\)|" r"isadmin\(.*\)|" r"cache_key_wrapper\(.*\)|" r"url_param\(.*\)" r").*\}\}" )↑↑↑↑注意此处的 current_userroles 和 isadmin 是我自定义的，源文件没有
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
↑↑↑↑仿照系统自带的 current_username 编造自己的函数，我写了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), } )↑↑↑↑仿照系统自带的 current_username 编造自己的函数，我写了current_userroles 和 isadmin
就是这3个地方，但是注意，自己在第二步早的函数，返回值必须是：
ALLOWED_TYPES = ( NONE_TYPE, "bool", "str", "unicode", "int", "long", "float", "list", "dict", "tuple", "set", )
否则会提示错误，或者自己修改这个types，我是转换，比如上面那个g.user.roles 返回的结果就不是上面类型，导致我一直不成功，最后修改了下，才可以
3、判断是否自定义成功：
在superset sql lab中执行如下代码，如果能被解析，就说明成功
4、应用案例：
在dataset里面，动态访问数据源，数据源添加where语句：select * from sales where salesname =' {{current_username()}}'
dashboard里面，通过获取筛选器的结果，然后获取其他表应当显示的数据范围：
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.p以上就是Superset实现动态SQL查询功能的详细内容，更多请关注0133技术站其它相关文章！
