codifica / orm

import baze de date import orm import sqlalchemy database = databases.Database (“sqlite: ///db.sqlite”) metadata = sqlalchemy.MetaData () class Note (orm.Model): __tablename__ = “notes” __database__ = database __metadata__ = metadata id = orm.Integer (primary_key = True) text = orm.String (max_length = 100) completat = orm.Boolean (implicit = False) # Creati motorul bazei de date = sqlalchemy.create_engine (str (database.url)) metadata.create_all ( motor) # .create () await Note.objects.create (text = “Cumparati alimentele.”, complete = False) await Note.objects.create (text = “Call Mum.”, complete = True) await Note.objects .create (text = “Trimiteti facturi.”, completat = Adevarat) # .all () note = asteapta Note.objects.all () # .filter () note = asteapta Note.objects.filter (completat = Adevarat) .all () # exact, iexact, contine, icontains, lt, lte, gt, gte,in note = await Note.objects.filter (text__icontains = “mum”). all () # .get () note = await Note.objects.get (id = 1) # .update () await note.update (complete = Adevarat) # .delete () await note.delete () # „pk” se refera intotdeauna la cheia primara note = await Note.

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objects.get (pk = 2) note.pk # 2

import de baze de date import orm import sqlalchemy database = databases.Database (“sqlite: ///db.sqlite”) metadate = sqlalchemy.MetaData () class Album (orm.Model): __tablename__ = “album” __metadata__ = metadate __database__ = baza de date id = orm.Integer (primary_key = True) name = orm.String (max_length = 100) class Track (orm.Model): __tablename__ = “track” __metadata__ = metadata __database__ = database id = orm.Integer (primary_key = True) album = orm.ForeignKey (Album) title = orm.String (max_length = 100) position = orm.Integer () # Creati niste inregistrari cu care sa lucrati. malibu = await Album.objects.create (name = “Malibu”) await Track.objects.create (album = malibu, title = “The Bird”, position = 1) await Track.objects.create (album = malibu, title = „Inima nu are nicio sansa”, pozitia = 2) asteapta Track.objects. create (album = malibu, title = “The Waters”, position = 3) fantasies = await Album.objects.create (name = “Fantasies”) await Track.objects.create (album = fantasies, title = “Help I’m In viata “, pozitia = 1) asteapta Track.objects.create (album = fantezii, title =” Sick Muse “, pozitia = 2) # Prelueaza o instanta, fara a incarca o relatie cu cheie straina pe ea. track = await Track.objects.get (title = “The Bird”) # Avem o instanta de album, dar are doar cheia primara populata print (track.album) # Album (id = 1) [rar] print (track) .album.pk) # 1 print (track.album.name) # Raises AttributeError # Incarca relatia din baza de date asteapta track.album.load () assert track.album.name == “Malibu” # De data aceasta, preia un de exemplu, incarcarea relatiei cu cheie straina. track = await Track.objects.select_related (“