Sure, use an explicit transaction:
https://docs.sqlalchemy.org/en/13/core/connections.html#using-transactions
with connection.begin() as trans:
# might as well lift this out of the loop
insert = table.insert()
for datum in data:
statement = insert.values(**datum).returning(table.c.rowid)
# etc.
Simon
On Thu, Nov 28, 2019 at 9:57 AM Javier Collado Jiménez
<[email protected]> wrote:
>
> Is there a way, at least, of preventing commit in every insert?
> Doing that:
> for datum in data:
>
> statement=table.insert().values(**datum).returning(table.c.rowid)
> inserted_rowids=conn.execute(statement)
> rowid=inserted_rowids.fetchone()[0]
> there is a commit after every insert
>
> El miércoles, 27 de noviembre de 2019, 19:07:31 (UTC+1), Mike Bayer escribió:
>>
>>
>>
>> On Wed, Nov 27, 2019, at 1:05 PM, Javier Collado Jiménez wrote:
>>
>> One more thing about returning data. When I insert rows one by one, it works:
>> for datum in data:
>>
>> statement=table.insert().values(**datum).returning(table.c.rowid)
>> inserted_rowids=conn.execute(statement)
>> rowid=inserted_rowids.fetchone()[0]
>>
>> But when I try to do it in a bundle if there is more than one row:
>> statement=table.insert().returning(table.c.rowid)
>> inserted_rowids=conn.execute(statement, data)
>> for rowid in inserted_rowids:
>> print(rowid)
>>
>> File
>> "/home/pyweb/projects/T4toBHStore/lib/python3.4/site-packages/sqlalchemy/engine/result.py",
>> line 1266, in fetchone
>> row = self._fetchone_impl()
>> File
>> "/home/pyweb/projects/T4toBHStore/lib/python3.4/site-packages/sqlalchemy/engine/result.py",
>> line 1146, in _fetchone_impl
>> return self.cursor.fetchone()
>> cx_Oracle.InterfaceError: not a query
>>
>>
>> Is there a way to do a batch insert and recover every rowid?
>>
>>
>>
>> unfortunately no, DBAPI drivers do not support RETURNING with executemany().
>>
>>
>>
>>
>> Thank you!!
>>
>>
>> El miércoles, 20 de noviembre de 2019, 16:39:36 (UTC+1), Mike Bayer escribió:
>>
>>
>>
>> On Wed, Nov 20, 2019, at 9:05 AM, Javier Collado Jiménez wrote:
>>
>> Hello,
>>
>> Using ORM, i'm inserting like that:
>>
>> session.add(table_mapper(**datum))
>>
>> And updating:
>>
>> session.query(dest_table).filter_by(**filters).filter(filter_column >
>> from_date).update(datum, synchronize_session=False)
>>
>>
>> Is there a way to get returning rowid of the rows affected.
>>
>> I want to keep them to be used in further updates (it's really faster if you
>> use rowid in UPDATE WHERE clause)
>>
>>
>> you would need to construct a core UPDATE statement adding this column using
>> returning() (see
>> https://docs.sqlalchemy.org/en/13/core/dml.html?highlight=returning#sqlalchemy.sql.expression.Update.returning
>> ). You might want to add it to your table definition as a "system" column
>> perhaps, not really sure. making a system column is illustrated at
>> https://docs.sqlalchemy.org/en/13/orm/versioning.html?highlight=system#server-side-version-counters
>>
>>
>>
>>
>> --
>> SQLAlchemy -
>> The Python SQL Toolkit and Object Relational Mapper
>>
>> http://www.sqlalchemy.org/
>>
>> To post example code, please provide an MCVE: Minimal, Complete, and
>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
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>>
>>
>>
>> --
>> SQLAlchemy -
>> The Python SQL Toolkit and Object Relational Mapper
>>
>> http://www.sqlalchemy.org/
>>
>> To post example code, please provide an MCVE: Minimal, Complete, and
>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
>> description.
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>>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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