I'm just posting this to the group for search equity--
Until recently (2012, via this commit
https://bitbucket.org/zzzeek/sqlalchemy/issue/2544), the way recommended
several times in this group and stackoverflow to generate "IS NOT NULL" was
to use a column opreation:
sq = sess.query(A.id.label('id')).filter(A.id.op('IS NOT')(None))
However, that will cause a sqlalchemy.exc.CompileError when print/compiling
a statement with "literal binds"
# this will raise an error
print str(sq.statement.compile(dialect=postgresql.dialect(),
compile_kwargs={"literal_binds": True}))
To get around that issue, these forms will all compile correctly:
# 0.7.9 and later
sq = sess.query(A.id.label('id')).filter(A.id != None)
# 0.7.8 and earlier
sq = sess.query(A.id.label('id')).filter(A.id.op('IS
NOT')(sqlalchemy.sql.expression.null()))
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