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relational-mapping
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‎0x0F-python-object_relational_mapping/10-model_state_my_get.py

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#!/usr/bin/python3
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"""
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Lists the State object with the name passed as argument
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from the database hbtn_0e_6_usa.
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Usage: ./10-model_state_my_get.py <mysql username> /
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<mysql password> /
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<database name>
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<state name searched>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from model_state import State
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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found = False
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for state in session.query(State):
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if state.name == sys.argv[4]:
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print("{}".format(state.id))
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found = True
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break
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if found is False:
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print("Not found")

‎0x0F-python-object_relational_mapping/100-relationship_states_cities.py

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#!/usr/bin/python3
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"""
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Creates the State “California” with the City “San Francisco”
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from the database hbtn_0e_100_usa.
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Usage: ./100-relationship_states_cities.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from relationship_state import State
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from relationship_city import Base, City
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Base.metadata.create_all(engine)
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Session = sessionmaker(bind=engine)
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session = Session()
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session.add(City(name="San Francisco", state=State(name="California")))
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session.commit()

‎0x0F-python-object_relational_mapping/101-relationship_states_cities_list.py

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#!/usr/bin/python3
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"""
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Lists all States and corresponding Cities in the database hbtn_0e_101_usa.
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Usage: ./101-relationship_states_cities_list.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from relationship_state import State
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from relationship_city import City
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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for state in session.query(State).order_by(State.id):
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print("{}: {}".format(state.id, state.name))
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for city in state.cities:
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print(" {}: {}".format(city.id, city.name))

‎0x0F-python-object_relational_mapping/102-relationship_cities_states_list.py

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#!/usr/bin/python3
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"""
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Lists all City objects from the database hbtn_0e_101_usa.
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Usage: ./102-relationship_cities_states_list.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from relationship_state import State
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from relationship_city import City
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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for city in session.query(City).order_by(City.id):
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print("{}: {} -> {}".format(city.id, city.name, city.state.name))

‎0x0F-python-object_relational_mapping/11-model_state_insert.py

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#!/usr/bin/python3
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"""
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Adds the State object "Louisiana" to the database hbtn_0e_6_usa.
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Usage: ./11-model_state_insert.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from model_state import State
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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louisiana = State(name="Louisiana")
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session.add(louisiana)
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session.commit()
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print(louisiana.id)

‎0x0F-python-object_relational_mapping/12-model_state_update_id_2.py

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#!/usr/bin/python3
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"""
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Changes the name of the State object where id = 2 to
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New Mexico in the database hbtn_0e_6_usa.
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Usage: ./12-model_state_update_id_2.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from model_state import State
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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state = session.query(State).filter_by(id=2).first()
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state.name = "New Mexico"
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session.commit()

‎0x0F-python-object_relational_mapping/13-model_state_delete_a.py

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#!/usr/bin/python3
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"""
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Deletes all State objects with a name containing
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the letter a from the database hbtn_0e_6_usa.
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Usage: ./13-model_state_delete_a.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from model_state import State
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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for state in session.query(State):
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if "a" in state.name:
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session.delete(state)
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session.commit()

‎0x0F-python-object_relational_mapping/14-model_city_fetch_by_state.py

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#!/usr/bin/python3
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"""
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Lists all City objects from the database hbtn_0e_14_usa.
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Usage: ./14-model_city_fetch_by_state.py <mysql username> /
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<mysql password> /
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<database name>
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"""
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import sys
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from model_state import State
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from model_city import City
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if __name__ == "__main__":
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engine = create_engine("mysql+mysqldb://{}:{}@localhost/{}"
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.format(sys.argv[1], sys.argv[2], sys.argv[3]),
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pool_pre_ping=True)
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Session = sessionmaker(bind=engine)
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session = Session()
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for city, state in session.query(City, State) \
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.filter(City.state_id == State.id) \
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.order_by(City.id):
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print("{}: ({}) {}".format(state.name, city.id, city.name))

‎0x0F-python-object_relational_mapping/2-my_filter_states.py

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#!/usr/bin/python3
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"""
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Lists all states with a name starting with N from the database hbtn_0e_0_usa.
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Usage: ./1-filter_states.py <mysql username> \
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<mysql password> \
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<database name>
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"""
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import sys
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import MySQLdb
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if __name__ == "__main__":
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"""
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Access to the database and get the states
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from the database.
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"""
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db = MySQLdb.connect(user=sys.argv[1], passwd=sys.argv[2], db=sys.argv[3])
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c = db.cursor()
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c.execute("SELECT * \
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FROM `states` \
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WHERE BINARY `name` = '{}'".format(sys.argv[4]))
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[print(state) for state in c.fetchall()]

‎0x0F-python-object_relational_mapping/3-my_safe_filter_states.py

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#!/usr/bin/python3
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"""
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Displays all values in the states table of the database hbtn_0e_0_usa
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whose name matches that supplied as argument.
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Usage: ./2-my_filter_states.py <mysql username> \
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<mysql password> \
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<database name> \
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<state name searched>
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"""
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import MySQLdb
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import sys
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if __name__ == "__main__":
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"""
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Access to the database and get the states
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from the database.
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"""
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db = MySQLdb.connect(user=sys.argv[1], passwd=sys.argv[2], db=sys.argv[3])
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c = db.cursor()
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c.execute("SELECT * FROM `states`")
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[print(state) for state in c.fetchall() if state[1] == sys.argv[4]]

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