Sqlalchemy Primary Key Auto Generate

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  1. Unique Key
  2. Sqlalchemy Primary Key Auto Increment
Python ORM example (Python + SQLAlchemy + SQlite/MySQL)
dump_mysql.sql
Sqlalchemy
CREATETABLEaddress (
id INTNOT NULL AUTO_INCREMENT,
street VARCHAR(45) NOT NULL,
city VARCHAR(45) NOT NULL,
PRIMARY KEY (id))
ENGINE = InnoDB;
CREATETABLEuser (
id INTNOT NULL AUTO_INCREMENT,
name VARCHAR(45) NOT NULL,
email VARCHAR(45) NOT NULL,
nick VARCHAR(45) NULL,
address_id INTNOT NULL,
PRIMARY KEY (id),
UNIQUE KEY email_UNIQUE (email),
INDEX fk_user_address_idx (address_id ASC),
CONSTRAINT fk_user_address
FOREIGN KEY (address_id)
REFERENCES address(id)
)
ENGINE = InnoDB;

Sep 06, 2019 CREATE TABLE salespeople ( id INTEGER PRIMARY KEY, firstname TEXT NOT NULL, lastname TEXT NOT NULL, commissionrate REAL NOT NULL ); Inserting data with a SQLite autoincrement field When you have a database table with a SQLite autoincrement field, there are two ways to insert data into that table and automatically increment the primary key. Jun 10, 2015  Python ORM example (Python + SQLAlchemy + SQlite/MySQL) - Test.py.

Sqlalchemy Primary Key Auto Generate
dump_sqlite.sql
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATETABLE 'address' (
'id'INTEGERPRIMARY KEY AUTOINCREMENT NOT NULL,
'street'TEXTNOT NULL,
'city'TEXTNOT NULL
);
CREATETABLEuser (
'id'INTEGERPRIMARY KEY AUTOINCREMENT NOT NULL,
'name'TEXTNOT NULL,
'email'TEXTNOT NULL,
'nick'TEXT,
'address_id'INTEGER,
FOREIGN KEY(address_id) REFERENCES address(id)
);
COMMIT;
setup.py
__author__='martin'
# http://docs.cython.org/src/tutorial/cython_tutorial.html
# https://docs.python.org/2/distutils/builtdist.html
fromdistutils.coreimportsetup
fromCython.Buildimportcythonize
setup(
ext_modules=cythonize('Test.py')
)
# python setup.py build_ext --inplace
Test.py

Unique Key

fromsqlalchemy.ext.declarativeimportdeclarative_base
#from sqlalchemy import *
#from sqlalchemy.orm import *
# Pro entity v podadresari. Podaresar *musi* obsahovat prazdny soubor __init__.py !
#from entity.User import User
''
Zavislosti:
# apt-get install python-sqlalchemy
Kompilace:
# apt-get install cython
$ python setup.py build_ext --inplace
Pouziti:
v adresari s Test.so a db.sqlite3:
$ python
>>> import Test
''
fromsqlalchemyimportcreate_engine, exists
fromsqlalchemy.ormimportrelationship, sessionmaker
fromsqlalchemy.schemaimportColumn, ForeignKey
fromsqlalchemy.typesimportInteger, String
Base=declarative_base()
classUser(Base):
__tablename__='user'
id=Column(Integer, primary_key=True)
name=Column(String, nullable=False)
email=Column(String, nullable=False, unique=True)
nick=Column(String)
address_id=Column(Integer, ForeignKey('address.id'))
address=relationship('Address', back_populates='user')
classAddress(Base):
__tablename__='address'
id=Column(Integer, primary_key=True)
street=Column(String, nullable=False)
city=Column(String, nullable=False)
user=relationship('User', back_populates='address')
def__init__(self, city='Jicin'): # default value
self.city=city
classMain():
def__init__(self):
pass
def__del__(self):
pass
defrun(self):
# INSERT
ifnotsession.query(exists().where(User.email'test@example.net')).scalar():
u1=User()
u1.name='Test user'
u1.email='test@example.net'
a1=Address()
a1.street='Str 123'
a1.city='City WTF'
u1.address=a1
session.add(a1)
session.add(u1)
session.commit()
# test, jestli v DB dany zaznam existuje:
#print session.query(Address).filter_by(city='City WTF').count()
#print bool( session.query(Address).filter_by(city='City WTF').count() )
# SELECT
ifsession.query(exists().where(Address.city'City WTF')).scalar():
a2=session.query(Address).filter_by(city='City WTF').first()
printa2.city
ifbool(session.query(Address).filter_by(city='City WTF').count()):
a2=session.query(Address).filter_by(city='City WTF').first()
printa2.city
# UPDATE
ifsession.query(exists().where(User.email'test@example.net')).scalar():
session.query(User).filter_by(email='test@example.net').update({'nick': 'a'})
session.commit()
ifsession.query(exists().where(User.email'test@example.net')).scalar():
u=session.query(User).filter_by(email='test@example.net').first()
u.nick='b'
session.commit()
# DELETE
ifsession.query(exists().where(User.email'test@example.net')).scalar():
session.query(User).filter_by(email='test@example.net').delete()
session.commit()
ifsession.query(exists().where(Address.city'City WTF')).scalar():
session.query(Address).filter_by(city='City WTF').delete()
session.commit()
if__name__'__main__'or__name__'Test': # http://stackoverflow.com/a/419986/1974494
# __main_ - spusteni jako skript, 'Test' - jako modul
#engine = create_engine('mysql://test:test@localhost:3306/test', echo=False)
engine=create_engine('sqlite:///db.sqlite3')
''
sqlite:///:memory: (or, sqlite://)
sqlite:///relative/path/to/file.db
sqlite:////absolute/path/to/file.db
''
connection=engine.connect()
Session=sessionmaker(bind=engine)
session=Session()
Main().run()
connection.close()
# http://docs.sqlalchemy.org/en/latest/orm/backref.html
# http://stackoverflow.com/a/30506593/1974494 !!!!!!!!!!!
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    commented Aug 29, 2017

    Take these code as example:

    When try to generate the table, an error is occurred. The trace back information is something like this:

    May be it can be enhanced by support the table defined schema like this ?

    added the tablename label Sep 13, 2017
    added this to the 2.3 milestone Sep 13, 2017
    Merged

    commented Sep 25, 2017

    This is handled by #541.

    closed this Sep 26, 2017

    Sqlalchemy Primary Key Auto Increment

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