This library has been archived. Use ADBC with BigQuery instead.
Req plugin for Google BigQuery.
ReqBigQuery makes it easy to make BigQuery queries. It uses Goth
for authentication. Query results are decoded into the ReqBigQuery.Result struct.
The struct implements the Table.Reader protocol and thus can be efficiently traversed by rows or columns.
Mix.install([{:goth,"~> 1.3.0"},{:req,"~> 0.3.5"},{:req_bigquery,"~> 0.1.5"}])# We use Goth to authenticate to Google Cloud API.# See: https://hexdocs.pm/goth/1.3.0-rc.4/Goth.Token.html#fetch/1-source for more information.credentials=File.read!("credentials.json")|>Jason.decode!()source={:service_account,credentials,[]}{:ok,_}=Goth.start_link(name: MyGoth,source: source,http_client: &Req.request/1)project_id=System.fetch_env!("PROJECT_ID")# With plain string queryquery="""SELECT title, SUM(views) AS views FROM `bigquery-public-data.wikipedia.table_bands` WHERE EXTRACT(YEAR FROM datehour) <= 2021 GROUP BY title ORDER BY views DESC LIMIT 10"""req=Req.new()|>ReqBigQuery.attach(goth: MyGoth,project_id: project_id)res=Req.post!(req,bigquery: query).body#=># %ReqBigQuery.Result{# columns: ["title", "views"],# job_id: "job_JDDZKquJWkY7x0LlDcmZ4nMQqshb",# num_rows: 10,# rows: %Stream{}# }Enum.to_list(res.rows)#=># [# ["The_Beatles", 13758950],# ["Queen_(band)", 12019563],# ["Pink_Floyd", 9522503],# ["AC/DC", 8972364],# ["Led_Zeppelin", 8294994],# ["Linkin_Park", 8242802],# ["The_Rolling_Stones", 7825952],# ["Red_Hot_Chili_Peppers", 7302904],# ["Fleetwood_Mac", 7199563],# ["Twenty_One_Pilots", 6970692]# ]# With parameterized queryquery="""SELECT EXTRACT(YEAR FROM datehour) AS year, SUM(views) AS views FROM `bigquery-public-data.wikipedia.table_bands` WHERE EXTRACT(YEAR FROM datehour) <= 2021 AND title = ? GROUP BY year ORDER BY views DESC"""req=Req.new()|>ReqBigQuery.attach(goth: MyGoth,project_id: project_id)res=Req.post!(req,bigquery: {query,["Linkin_Park"]}).body#=># %ReqBigQuery.Result{# columns: ["year", "views"],# job_id: "job_GXiJvALNsTAoAOJ39Eg3Mw94XMUQ",# num_rows: 7,# rows: %Stream{}# }Enum.to_list(res.rows)#=> [[2017, 2895889], [2016, 1173359], [2018, 1133770], [2020, 906538], [2015, 860899], [2019, 790747], [2021, 481600]]Copyright (C) 2022 Dashbit
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