diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/build/orm/persistence_techniques.rst | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/build/orm/persistence_techniques.rst b/doc/build/orm/persistence_techniques.rst index ec13ff782..a26be6b4c 100644 --- a/doc/build/orm/persistence_techniques.rst +++ b/doc/build/orm/persistence_techniques.rst @@ -12,14 +12,17 @@ expression instead of a literal value. It's especially useful for atomic updates, calling stored procedures, etc. All you do is assign an expression to an attribute:: - class SomeClass(object): - pass - mapper(SomeClass, some_table) + class SomeClass(Base): + __tablename__ = "some_table" + + # ... + + value = Column(Integer) someobject = session.query(SomeClass).get(5) # set 'value' attribute to a SQL expression adding one - someobject.value = some_table.c.value + 1 + someobject.value = SomeClass.value + 1 # issues "UPDATE some_table SET value=value+1" session.commit() |