August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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61
3.6 SQL
session.expunge(albert) #
❶
session.new
Out:
IdentitySet([])
❶ セッションからインスタンスを削除する（セッションに追加したすべての新しいオブジェクトを削
除する
expunge_all
メソッドもある）。
この時点では、データベースへの挿入や削除は行われていません。
nobel_winners
リストの全メ
ンバーをセッションに追加し、データベースにコミットしてみましょう。
winner_rows = [Winner(**w) for w in nobel_winners]
session.add_all(winner_rows)
session.commit()
Out:
INFO:sqlalchemy.engine.base.Engine:BEGIN (implicit)
...
INFO:sqlalchemy.engine.base.Engine:INSERT INTO winners (name,
category, year, nationality, sex) VALUES (?, ?, ?, ?, ?)
INFO:sqlalchemy.engine.base.Engine:(u'Albert Einstein',
u'Physics', 1921, u'Swiss', u'male')
...
INFO:sqlalchemy.engine.base.Engine:COMMIT
nobel_winners
データをデータベースにコミットしたので、このデータベースに対して実行でき ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.