mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-06-01 13:28:30 -04:00
Mike Bayer
065fcbd9d2
relationship(), to eliminate confusion over the relational algebra term. relation() however will remain available in equal capacity for the foreseeable future. [ticket:1740]
71 lines
2.0 KiB
Python
71 lines
2.0 KiB
Python
import testenv; testenv.simple_setup()
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import time
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from sqlalchemy import *
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from sqlalchemy.orm import *
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metadata = MetaData(create_engine('sqlite://', echo=True))
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t1s = Table( 't1s', metadata,
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Column( 'id', Integer, primary_key=True),
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Column('data', String(100))
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)
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t2s = Table( 't2s', metadata,
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Column( 'id', Integer, primary_key=True),
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Column( 't1id', Integer, ForeignKey("t1s.id"), nullable=True ))
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t3s = Table( 't3s', metadata,
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Column( 'id', Integer, primary_key=True),
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Column( 't2id', Integer, ForeignKey("t2s.id"), nullable=True ))
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t4s = Table( 't4s', metadata,
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Column( 'id', Integer, primary_key=True),
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Column( 't3id', Integer, ForeignKey("t3s.id"), nullable=True ))
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[t.create() for t in [t1s,t2s,t3s,t4s]]
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class T1( object ): pass
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class T2( object ): pass
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class T3( object ): pass
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class T4( object ): pass
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mapper( T1, t1s )
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mapper( T2, t2s )
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mapper( T3, t3s )
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mapper( T4, t4s )
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cascade = "all, delete-orphan"
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use_backref = True
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if use_backref:
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class_mapper(T1).add_property( 't2s', relationship(T2, backref=backref("t1", cascade=cascade), cascade=cascade))
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class_mapper(T2).add_property ( 't3s', relationship(T3, backref=backref("t2",cascade=cascade), cascade=cascade) )
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class_mapper(T3).add_property( 't4s', relationship(T4, backref=backref("t3", cascade=cascade), cascade=cascade) )
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else:
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T1.mapper.add_property( 't2s', relationship(T2, cascade=cascade))
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T2.mapper.add_property ( 't3s', relationship(T3, cascade=cascade) )
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T3.mapper.add_property( 't4s', relationship(T4, cascade=cascade) )
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now = time.time()
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print "start"
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sess = create_session()
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o1 = T1()
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sess.save(o1)
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for i2 in range(10):
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o2 = T2()
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o1.t2s.append( o2 )
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for i3 in range( 10 ):
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o3 = T3()
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o2.t3s.append( o3 )
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for i4 in range( 10 ):
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o3.t4s.append ( T4() )
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print i2, i3, i4
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print len([s for s in sess])
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print "flushing"
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sess.flush()
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total = time.time() - now
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print "done,total time", total
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