Building Data-Driven Web Apps with Pyramid and SQLAlchemy Transcripts
Chapter: Using SQLAchemy
Lecture: Concept: Database updates
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In order to update existing data, we start
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like we always do, we get a session, and then we
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retrieve one or more records from the database.
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Here we're just getting one package.
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We're going to get this package back, and if we make
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changes to it, so we set the author value to a new name
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and we set the author email to a new email
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SQLAlchemy will track within the session that
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that record is dirty and it needs to be updated
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because we've changed some fields.
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And then, when we're ready to actually
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save it, push all the changes back.
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I could apply this to as many entities as we'd like
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it doesn't have to just be one, then we're going to
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commit the unit to work, and it's going to look
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at the changes, do all the changes in a single
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transaction, back to the database.
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We use the unit of work to do
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our updates just like we do the inserts.
