sqlalchemy

问题 I'm trying to add the elements of a dictionary to the database. I'm completely new to working with databases and I'm just wondering if I'm doing it right or not, because it seems to me that not. If so, how can I do it ? And how can I print all the elements of the database then ? from sqlalchemy import Column, String, Integer, create_engine from sqlalchemy.orm import relationship, sessionmaker from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Person(Base):

问题 I'm trying to add the elements of a dictionary to the database. I'm completely new to working with databases and I'm just wondering if I'm doing it right or not, because it seems to me that not. If so, how can I do it ? And how can I print all the elements of the database then ? from sqlalchemy import Column, String, Integer, create_engine from sqlalchemy.orm import relationship, sessionmaker from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Person(Base):

问题 I'm trying to add the elements of a dictionary to the database. I'm completely new to working with databases and I'm just wondering if I'm doing it right or not, because it seems to me that not. If so, how can I do it ? And how can I print all the elements of the database then ? from sqlalchemy import Column, String, Integer, create_engine from sqlalchemy.orm import relationship, sessionmaker from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Person(Base):

问题 I've got two models: User and Group. User can be in one group so: class User(db.Model): # other fields group_id = db.Column(db.Integer(), db.ForeignKey('group.id')) but on the other hand I would also have some info about user who create that specific group: class Group(db.Model): # other fields users = db.relationship("User", backref='group') created_by = db.Column(db.Integer(), db.ForeignKey('user.id')) Result is: sqlalchemy.exc.CircularDependencyError: Can't sort tables for DROP; an

问题 I've got two models: User and Group. User can be in one group so: class User(db.Model): # other fields group_id = db.Column(db.Integer(), db.ForeignKey('group.id')) but on the other hand I would also have some info about user who create that specific group: class Group(db.Model): # other fields users = db.relationship("User", backref='group') created_by = db.Column(db.Integer(), db.ForeignKey('user.id')) Result is: sqlalchemy.exc.CircularDependencyError: Can't sort tables for DROP; an

问题 The code below worked when using Python 2.7, but raises a StatementError when using Python 3.5. I haven't found a good explanation for this online yet. Why doesn't sqlalchemy accept simple Python 3 string objects in this situation? Is there a better way to insert rows into a table? from sqlalchemy import Table, MetaData, create_engine import json def add_site(site_id): engine = create_engine('mysql+pymysql://root:password@localhost/database_name', encoding='utf8', convert_unicode=True)

问题 The code below worked when using Python 2.7, but raises a StatementError when using Python 3.5. I haven't found a good explanation for this online yet. Why doesn't sqlalchemy accept simple Python 3 string objects in this situation? Is there a better way to insert rows into a table? from sqlalchemy import Table, MetaData, create_engine import json def add_site(site_id): engine = create_engine('mysql+pymysql://root:password@localhost/database_name', encoding='utf8', convert_unicode=True)

问题 Is it possible to list all indices in a db using sqlalchemy? 回答1: yes. from sqlalchemy import create_engine from sqlalchemy.engine import reflection engine = create_engine('...') insp = reflection.Inspector.from_engine(engine) for name in insp.get_table_names(): for index in insp.get_indexes(name): print index 来源： https://stackoverflow.com/questions/5605019/listing-indices-using-sqlalchemy

问题 Is it possible to list all indices in a db using sqlalchemy? 回答1: yes. from sqlalchemy import create_engine from sqlalchemy.engine import reflection engine = create_engine('...') insp = reflection.Inspector.from_engine(engine) for name in insp.get_table_names(): for index in insp.get_indexes(name): print index 来源： https://stackoverflow.com/questions/5605019/listing-indices-using-sqlalchemy

问题 Is it possible to list all indices in a db using sqlalchemy? 回答1: yes. from sqlalchemy import create_engine from sqlalchemy.engine import reflection engine = create_engine('...') insp = reflection.Inspector.from_engine(engine) for name in insp.get_table_names(): for index in insp.get_indexes(name): print index 来源： https://stackoverflow.com/questions/5605019/listing-indices-using-sqlalchemy