Hi, I am using Session.bulk_insert_mappings() <http://docs.sqlalchemy.org/en/latest/orm/session_api.html#sqlalchemy.orm.session.Session.bulk_insert_mappings> to insert a number of entities. This works great except when there are entities with None values. For example the following call issues three insert statements instead of a single one:
session.bulk_insert_mappings(Doc, [ > dict(id=1, col_a='A', col_b='B'), > dict(id=2, col_a='A', col_b=None), > dict(id=3, col_a='A', col_b='B') > ]) > Log: > 2016-01-06 21:35:58,033 INFO sqlalchemy.engine.base.Engine INSERT INTO doc > (id, col_a, col_b) VALUES (?, ?, ?) > 2016-01-06 21:35:58,033 INFO sqlalchemy.engine.base.Engine (1, 'A', 'B') > 2016-01-06 21:35:58,034 INFO sqlalchemy.engine.base.Engine INSERT INTO doc > (id, col_a) VALUES (?, ?) > 2016-01-06 21:35:58,034 INFO sqlalchemy.engine.base.Engine (2, 'A') > 2016-01-06 21:35:58,034 INFO sqlalchemy.engine.base.Engine INSERT INTO doc > (id, col_a, col_b) VALUES (?, ?, ?) > 2016-01-06 21:35:58,034 INFO sqlalchemy.engine.base.Engine (3, 'A', 'B') > I would expect that a single insert is made and that `null` is used as value for `col_b`. I tried to use `sqlalchemy.sql.expression.null()` but that does not seem to work with the bulk functions. I also know that I could use evaluates_none() <http://docs.sqlalchemy.org/en/latest/core/type_api.html#sqlalchemy.types.TypeEngine.evaluates_none>, but I don't want to change the model because the bulk insertion is only used in the migration script. Here is an example: https://gist.github.com/tsauerwein/d9630336731fff0547ba Thanks, Tobias -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
