On Jul 19, 2013, at 12:14 PM, Ed Singleton <singleto...@gmail.com> wrote:
>
>
> A sample script is below (bear in mind that the script contains the two
> errors and I wouldn't now expect it to work anyway).
OK this example is calling UPDATE towards "email_table" as the target, but then
specifies the columns in "email_archive_table" in the SET clause, so that's why
this doesn't work. The table referred to by UPDATE and SET need to be the
same table.
>
> Thanks for your help.
>
> Ed
>
> ```
> import datetime
>
> import sqlalchemy as sa
> from sqlalchemy import (String, Unicode, Integer,
> DateTime, ForeignKey, Table, Column)
>
> metadata = sa.MetaData()
>
> email_table = Table("Email", metadata,
> Column("id", Integer, primary_key=True),
> Column("to_addr", Unicode(256), primary_key=True),
> Column("subject", Unicode(256), nullable=False),
> Column("lastmodifieddate", DateTime(), default=datetime.datetime.now,
> onupdate=datetime.datetime.now)
> )
>
> email_archive_table = Table("EmailArchive", metadata,
> Column("id", Integer, primary_key=True),
> Column("to_addr", Unicode(256), primary_key=True),
> Column("subject", Unicode(256), nullable=False),
> Column("lastmodifieddate", DateTime(), default=datetime.datetime.now,
> onupdate=datetime.datetime.now)
> )
>
> where_clause = sa.and_(
> email_table.c.id==email_archive_table.c.id,
> email_table.c.to_addr==email_archive_table.c.to_addr)
>
> update_values = dict(
> [(col, None) for col in email_archive_table.columns])
>
> query = email_table.update().values(update_values)
> query = query.where(where_clause)
>
> print query
> ```
>
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