[Sqlalchemy-commits] [1350] sqlalchemy/branches/schema/examples/polymorph: this is now the basic pol
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[Sqlalchemy-commits] [1350] sqlalchemy/branches/schema/examples/polymorph: this is now the basic polymorphic example
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From: <co...@sq...> - 2006-04-28 22:12:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head><style type="text/css"><!-- #msg dl { border: 1px #006 solid; background: #369; padding: 6px; color: #fff; } #msg dt { float: left; width: 6em; font-weight: bold; } #msg dt:after { content:':';} #msg dl, #msg dt, #msg ul, #msg li { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt; } #msg dl a { font-weight: bold} #msg dl a:link { color:#fc3; } #msg dl a:active { color:#ff0; } #msg dl a:visited { color:#cc6; } h3 { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt; font-weight: bold; } #msg pre { overflow: auto; background: #ffc; border: 1px #fc0 solid; padding: 6px; } #msg ul, pre { overflow: auto; } #patch { width: 100%; } #patch h4 {font-family: verdana,arial,helvetica,sans-serif;font-size:10pt;padding:8px;background:#369;color:#fff;margin:0;} #patch .propset h4, #patch .binary h4 {margin:0;} #patch pre {padding:0;line-height:1.2em;margin:0;} #patch .diff {width:100%;background:#eee;padding: 0 0 10px 0;overflow:auto;} #patch .propset .diff, #patch .binary .diff {padding:10px 0;} #patch span {display:block;padding:0 10px;} #patch .modfile, #patch .addfile, #patch .delfile, #patch .propset, #patch .binary, #patch .copfile {border:1px solid #ccc;margin:10px 0;} #patch ins {background:#dfd;text-decoration:none;display:block;padding:0 10px;} #patch del {background:#fdd;text-decoration:none;display:block;padding:0 10px;} #patch .lines, .info {color:#888;background:#fff;} --></style> <title>[1350] sqlalchemy/branches/schema/examples/polymorph: this is now the basic polymorphic example</title> </head> <body> <div id="msg"> <dl> <dt>Revision</dt> <dd>1350</dd> <dt>Author</dt> <dd>zzzeek</dd> <dt>Date</dt> <dd>2006-04-28 17:11:52 -0500 (Fri, 28 Apr 2006)</dd> </dl> <h3>Log Message</h3> <pre>this is now the basic polymorphic example</pre> <h3>Added Paths</h3> <ul> <li><a href="#sqlalchemybranchesschemaexamplespolymorphpolymorphpy">sqlalchemy/branches/schema/examples/polymorph/polymorph.py</a></li> </ul> <h3>Removed Paths</h3> <ul> <li><a href="#sqlalchemybranchesschemaexamplespolymorphpolymorph2py">sqlalchemy/branches/schema/examples/polymorph/polymorph2.py</a></li> </ul> </div> <div id="patch"> <h3>Diff</h3> <a id="sqlalchemybranchesschemaexamplespolymorphpolymorphpyfromrev1349sqlalchemybranchesschemaexamplespolymorphpolymorph2py"></a> <div class="copfile"><h4>Copied: sqlalchemy/branches/schema/examples/polymorph/polymorph.py (from rev 1349, sqlalchemy/branches/schema/examples/polymorph/polymorph2.py) ( => )</h4> <pre class="diff"><span> <span class="info">Deleted: sqlalchemy/branches/schema/examples/polymorph/polymorph2.py =================================================================== </span><del>--- sqlalchemy/branches/schema/examples/polymorph/polymorph2.py 2006-04-28 22:11:28 UTC (rev 1349) </del><ins>+++ sqlalchemy/branches/schema/examples/polymorph/polymorph2.py 2006-04-28 22:11:52 UTC (rev 1350) </ins><span class="lines">@@ -1,125 +0,0 @@ </span><del>-from sqlalchemy import * -import sys - -# this example illustrates a polymorphic load of two classes, where each class has a very -# different set of properties - -db = create_engine('sqlite://', echo=True, echo_uow=False) - -# a table to store companies -companies = Table('companies', db, - Column('company_id', Integer, primary_key=True), - Column('name', String(50))).create() - -# we will define an inheritance relationship between the table "people" and "engineers", -# and a second inheritance relationship between the table "people" and "managers" -people = Table('people', db, - Column('person_id', Integer, primary_key=True), - Column('company_id', Integer, ForeignKey('companies.company_id')), - Column('name', String(50))).create() - -engineers = Table('engineers', db, - Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True), - Column('status', String(30)), - Column('engineer_name', String(50)), - Column('primary_language', String(50)), - ).create() - -managers = Table('managers', db, - Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True), - Column('status', String(30)), - Column('manager_name', String(50)) - ).create() - - -# create our classes. The Engineer and Manager classes extend from Person. -class Person(object): - def __init__(self, **kwargs): - for key, value in kwargs.iteritems(): - setattr(self, key, value) - def __repr__(self): - return "Ordinary person %s" % self.name -class Engineer(Person): - def __repr__(self): - return "Engineer %s, status %s, engineer_name %s, primary_language %s" % (self.name, self.status, self.engineer_name, self.primary_language) -class Manager(Person): - def __repr__(self): - return "Manager %s, status %s, manager_name %s" % (self.name, self.status, self.manager_name) -class Company(object): - def __init__(self, **kwargs): - for key, value in kwargs.iteritems(): - setattr(self, key, value) - def __repr__(self): - return "Company %s" % self.name - - -# create a union that represents both types of joins. we have to use -# nulls to pad out the disparate columns. -person_join = select( - [ - people, - managers.c.status, - managers.c.manager_name, - null().label('engineer_name'), - null().label('primary_language'), - column("'manager'").label('type') - ], - people.c.person_id==managers.c.person_id).union_all( - select( - [ - people, - engineers.c.status, - null().label('').label('manager_name'), - engineers.c.engineer_name, - engineers.c.primary_language, - column("'engineer'").label('type') - ], - people.c.person_id==engineers.c.person_id)).alias('pjoin') - - -person_mapper = mapper(Person, people, select_table=person_join, polymorphic_on=person_join.c.type) -mapper(Engineer, engineers, inherits=person_mapper, polymorphic_ident='engineer') -mapper(Manager, managers, inherits=person_mapper, polymorphic_ident='manager') - -mapper(Company, companies, properties={ - 'employees': relation(Person, lazy=True, private=True, backref='company') -}) - -session = create_session() -c = Company(name='company1') -c.employees.append(Manager(name='pointy haired boss', status='AAB', manager_name='manager1')) -c.employees.append(Engineer(name='dilbert', status='BBA', engineer_name='engineer1', primary_language='java')) -c.employees.append(Engineer(name='wally', status='CGG', engineer_name='engineer2', primary_language='python')) -c.employees.append(Manager(name='jsmith', status='ABA', manager_name='manager2')) -session.save(c) -session.flush() - -session.clear() - -c = session.query(Company).get(1) -for e in c.employees: - print e, e._instance_key, e.company - -print "\n" - -dilbert = session.query(Person).get_by(name='dilbert') -dilbert2 = session.query(Engineer).get_by(name='dilbert') -assert dilbert is dilbert2 - -dilbert.engineer_name = 'hes dibert!' - -session.flush() -session.clear() - -c = session.query(Company).get(1) -for e in c.employees: - print e, e._instance_key - -session.delete(c) -session.flush() - - -managers.drop() -engineers.drop() -people.drop() -companies.drop() </del></span></pre> </div> </div> </body> </html> |
