Superset实现动态SQL查询功能

编辑: admin 分类: mssql 发布时间: 2021-11-16 来源:互联网

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\(.*\国内服务器http://www.558idc.com/yz.html)|"
        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.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

 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

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