From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 7 Feb 2019 15:19:08 +0000 (-0500)
Subject: Use declarative mapping for the embedded SQL expressions example
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3212454906e048296b1e8cc92f775fd67fc89217;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

Use declarative mapping for the embedded SQL expressions example

Change-Id: I1e778409f2d6e50dfba40bafc58e56f3625e7a27
(cherry picked from commit 7816476cdd0a6c83cdd0eeab8698c2469aa0197b)
---

diff --git a/doc/build/orm/persistence_techniques.rst b/doc/build/orm/persistence_techniques.rst
index c25c68e17e..c017d75453 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()