Superset实现动态SQL查询

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:

 1 regex = re.compile(
 2         r"\{\{.*("
 3         r"current_user_id\(.*\)|"
 4         r"current_username\(.*\)|"
 5         r"current_userroles\(.*\)|"
 6         r"isadmin\(.*\)|"
 7         r"cache_key_wrapper\(.*\)|"
 8         r"url_param\(.*\)"
 9         r").*\}\}"
10     )

↑↑↑↑注意此处的 current_userroles 和 isadmin 是我自定义的,源文件没有

 1     def current_user_id(self, add_to_cache_keys: bool = True) -> Optional[int]:
 2         """
 3         Return the user ID of the user who is currently logged in.
 4 
 5         :param add_to_cache_keys: Whether the value should be included in the cache key
 6         :returns: The user ID
 7         """
 8 
 9         if hasattr(g, "user") and g.user:
10             if add_to_cache_keys:
11                 self.cache_key_wrapper(g.user.get_id())
12             return g.user.get_id()
13         return None
14 
15     def current_username(self, add_to_cache_keys: bool = True) -> Optional[str]:
16         """
17         Return the username of the user who is currently logged in.
18 
19         :param add_to_cache_keys: Whether the value should be included in the cache key
20         :returns: The username
21         """
22 
23         if g.user and hasattr(g.user, "username"):
24             if add_to_cache_keys:
25                 self.cache_key_wrapper(g.user.username)
26             return g.user.username
27         return None
28     def current_userroles(self, add_to_cache_keys: bool = True) -> Optional[str]:
29         """
30         Return the roles of the user who is currently logged in.
31 
32         :param add_to_cache_keys: Whether the value should be included in the cache key
33         :returns: The userroles
34         """
35 
36         if g.user and hasattr(g.user, "roles"):
37             if add_to_cache_keys:
38                 user_roles = "/".join([role.name.lower() for role in list(g.user.roles)])
39                 self.cache_key_wrapper(user_roles)
40                 print(user_roles)
41                 return user_roles
42                 """admin in user_roles"""
43         return None
44 
45     def isadmin(self, add_to_cache_keys: bool = True) -> Optional[str]:
46         """
47         Return the roles of the user who is currently logged in.
48 
49         :param add_to_cache_keys: Whether the value should be included in the cache key
50         :returns: The userroles
51         """
52 
53         if g.user and hasattr(g.user, "roles"):
54             if add_to_cache_keys:
55                 user_roles = [role.name.lower() for role in list(g.user.roles)]
56                 return "admin" in user_roles
57         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

 1 class JinjaTemplateProcessor(BaseTemplateProcessor):
 2     def set_context(self, **kwargs: Any) -> None:
 3         super().set_context(**kwargs)
 4         extra_cache = ExtraCache(self._extra_cache_keys)
 5         self._context.update(
 6             {
 7                 "url_param": partial(safe_proxy, extra_cache.url_param),
 8                 "current_user_id": partial(safe_proxy, extra_cache.current_user_id),
 9                 "current_username": partial(safe_proxy, extra_cache.current_username),
10                 "current_userroles": partial(safe_proxy, extra_cache.current_userroles),
11                 "isadmin": partial(safe_proxy, extra_cache.isadmin),
12                 "cache_key_wrapper": partial(safe_proxy, extra_cache.cache_key_wrapper),
13                 "filter_values": partial(safe_proxy, filter_values),
14             }
15         )

↑↑↑↑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:

 1 ALLOWED_TYPES = (
 2     NONE_TYPE,
 3     "bool",
 4     "str",
 5     "unicode",
 6     "int",
 7     "long",
 8     "float",
 9     "list",
10     "dict",
11     "tuple",
12     "set",
13 )

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:

 1 select  DATE,risktype,sum(num) as num from 
 2 (SELECT date , customerid,product,risktype ,count(*) as num 
 3 from v_superset_forecast_risk group by date , customerid,product,risktype ) a
 4 join 
 5 (select distinct customer_code,product from v_superset_access
 6 where name='{{ current_username() }}' )access
 7 on a.customerid=access.customer_code
 8 and a.product=access.product
 9 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')
10 and DATE_FORMAT(date,'%Y-%m')<={{ "'" + "', '".join(filter_values('yearmonthend')) + "'" }}
11 group by DATE,risktype

因为sql里面可以使用jinja 表达式,比如判断筛选当前没有筛选的时候,获取什么数据

 

1 {% if isadmin() %}
2 
3       select * from sales
4 
5 {% else %}
6 
7       select * from sales where name ='{{current_username()}}'
8 
9 {% endif %}

 注意{%   %} 内部使用参数的时候,不需要加{{}},否则报错

通过筛选器实现模糊查询

 

 

 

 5、官方参考文档:https://superset.apache.org/docs/installation/sql-templating

官方没有那么详细,但是里面有一些我这里可能也没有消化吸收掉,可以参考看下

总之,通过上面的自定义参数方法,和jinja表达式在sql中的应用,可以实现动态查询,解决一些无法通过页面直接交互查询结果显示的内容

另外如果你有其他应用或者自定义上的思考,欢迎留言,相互学习

 

posted @ 2021-08-09 11:44  数据行者  阅读(7207)  评论(0编辑  收藏  举报