Claudio Ortolina
62 lines
2.1 KiB
Markdown
62 lines
2.1 KiB
Markdown
# Music Library
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```elixir
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Mix.install([
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{:kino_db, "~> 0.2.10"},
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{:exqlite, "~> 0.23.0"}
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])
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```
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## Setup
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<!-- livebook:{"attrs":"eyJkYXRhYmFzZV9wYXRoIjoiL1VzZXJzL2Nsb3VkL2dpdGh1Yi5jb20vY2xvdWQ4NDIxL211c2ljX2xpYnJhcnkvZGF0YS9tdXNpY19saWJyYXJ5X2Rldi5kYiIsInR5cGUiOiJzcWxpdGUiLCJ2YXJpYWJsZSI6ImNvbm4ifQ","chunks":null,"kind":"Elixir.KinoDB.ConnectionCell","livebook_object":"smart_cell"} -->
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```elixir
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opts = [
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database: "/Users/cloud/github.com/cloud8421/music_library/data/music_library_dev.db"
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]
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{:ok, conn} = Kino.start_child({Exqlite, opts})
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```
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## Aggregates
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### Count of records per artist
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<!-- livebook:{"attrs":"eyJjYWNoZV9xdWVyeSI6dHJ1ZSwiY29ubmVjdGlvbiI6eyJ0eXBlIjoic3FsaXRlIiwidmFyaWFibGUiOiJjb25uIn0sImRhdGFfZnJhbWVfYWxpYXMiOiJFbGl4aXIuRXhwbG9yZXIuRGF0YUZyYW1lIiwicXVlcnkiOiJzZWxlY3QganNvbl9leHRyYWN0KGFydGlzdC52YWx1ZSwgJyQubmFtZScpIGFzIG5hbWUsIGNvdW50KDEpIGFzIGNcbmZyb20gcmVjb3JkcywganNvbl9lYWNoKHJlY29yZHMuYXJ0aXN0cykgYXJ0aXN0XG5ncm91cCBieSBuYW1lXG5vcmRlciBieSBjIGRlc2NcbjsiLCJyZXN1bHRfdmFyaWFibGUiOiJyZXN1bHQiLCJ0aW1lb3V0IjpudWxsfQ","chunks":null,"kind":"Elixir.KinoDB.SQLCell","livebook_object":"smart_cell"} -->
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```elixir
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result =
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Exqlite.query!(
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conn,
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~S"""
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select json_extract(artist.value, '$.name') as name, count(1) as c
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from records, json_each(records.artists) artist
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group by name
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order by c desc
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;
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""",
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[]
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)
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```
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### Count of records by genre
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<!-- livebook:{"attrs":"eyJjYWNoZV9xdWVyeSI6dHJ1ZSwiY29ubmVjdGlvbiI6eyJ0eXBlIjoic3FsaXRlIiwidmFyaWFibGUiOiJjb25uIn0sImRhdGFfZnJhbWVfYWxpYXMiOiJFbGl4aXIuRXhwbG9yZXIuRGF0YUZyYW1lIiwicXVlcnkiOiJzZWxlY3QgZ2VucmUudmFsdWUsIGNvdW50KGdlbnJlLnZhbHVlKSBhcyBjXG5mcm9tIHJlY29yZHMsIGpzb25fZWFjaChyZWNvcmRzLmdlbnJlcykgZ2VucmVcbmdyb3VwIGJ5IGdlbnJlLnZhbHVlXG5vcmRlciBieSBjIGRlc2NcbjtcbiIsInJlc3VsdF92YXJpYWJsZSI6InJlc3VsdDIiLCJ0aW1lb3V0IjpudWxsfQ","chunks":null,"kind":"Elixir.KinoDB.SQLCell","livebook_object":"smart_cell"} -->
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```elixir
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result2 =
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Exqlite.query!(
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conn,
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~S"""
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select genre.value, count(genre.value) as c
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from records, json_each(records.genres) genre
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group by genre.value
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order by c desc
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;
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""",
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[]
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)
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```
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