Databases
StackOverflow2013
Postsdbo
POadd an object in sqlalchemy with relationship
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POadd an object in sqlalchemy with relationship
    primarykey
    data
    text
    <p>I want to add a object into database using relationship, the code is blow:</p> <p>the code run in eclipse, database is postgresql</p> <pre><code>from sqlalchemy import Table, MetaData, Column, ForeignKey, Integer, String, Sequence from sqlalchemy.orm import mapper, relationship, backref from sqlalchemy.engine import create_engine from sqlalchemy.orm.session import sessionmaker </code></pre> <p>create engine and session</p> <pre><code>engine = create_engine("postgresql+psycopg2://openpg:openpgpwd@localhost:5432/testdb", echo=True) Session = sessionmaker(bind = engine) session = Session() metadata = MetaData() </code></pre> <p>create User and Address class </p> <pre><code>user = Table('user', metadata, Column('id',Integer,Sequence('user_id_seq'),primary_key=True), Column('name',String(50)), Column('fullname',String(50)), Column('password',String(12))) class User(object): def __init__(self, name, fullname, password): self.name = name self.fullname = fullname self.password = password address = Table('address', metadata, Column('id', Integer,Sequence('address_id_seq'),primary_key=True), Column('user_id',Integer,ForeignKey('user.id')), Column('email_address',String(50))) class Address(object): def __init__(self, user_id, email_address): self.user_id = user_id self.email_address = email_address mapper(User,user,properties = {'addresses': relationship(Address, backref=backref('user',order_by=address.c.id))}) mapper(Address, address) if __name__ == '__main__': jack = User('jack', 'Jack Bean', 'gjffdd') jack.addresses = [Address(email_address='jack@google.com'),Address (email_address='jack@yahoo.com')] session.add(jack) session.commit() </code></pre> <p>run in eclipse, the result is:</p> <pre><code> Traceback (most recent call last): File "D:\workspace\test1\dbtest\testrelationship.py", line 68, in &lt;module&gt; jack.addresses = [Address(email_address='jack@google.com'),Address (email_address='jack@yahoo.com')] TypeError: __init__() takes exactly 3 arguments (2 given) </code></pre> <p>I don't know how to resolve the problem, thank you!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USzimmer
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COIs that code copied verbatim? Because you have a few problematic spaces in `Address (email_address='jack@yahoo.com')`. Should be `Address(email_address='jack@yahoo.com')`.
      singulars
      1. POadd an object in sqlalchemy with relationship
      1. USJosefAssad
    2. COThe spaces is not the point, it's just my oversight. In the original pragram,it is right.@JosefAssad
      singulars
      1. POadd an object in sqlalchemy with relationship
      1. USzimmer
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload