Bulk update in SQLAlchemy Core using WHERE

Question

I have managed to work with the bulk insert in SQLAlchemy like:

conn.execute(addresses.insert(), [ 
   {\'user_id\': 1, \'email_address\' : \'jack@yahoo.com\         


        

Answer 1

Read Inserts, Updates and Deletes section of the documentation. Following code should get you started:

from sqlalchemy.sql.expression import bindparam
stmt = addresses.update().\
    where(addresses.c.id == bindparam('_id')).\
    values({
        'user_id': bindparam('user_id'),
        'email_address': bindparam('email_address'),
    })

conn.execute(stmt, [
    {'user_id': 1, 'email_address' : 'jack@yahoo.com', '_id':1},
    {'user_id': 1, 'email_address' : 'jack@msn.com', '_id':2},
    {'user_id': 2, 'email_address' : 'www@www.org', '_id':3},
    {'user_id': 2, 'email_address' : 'wendy@aol.com', '_id':4},
])

Answer 2

@Jongbin Park's solution DID work for me with a composite primary key. (Azure SQL Server).

update_vals = []
update_vals.append(dict(Name='name_a', StartDate='2020-05-26 20:17:32', EndDate='2020-05-26 20:46:03', Comment='TEST COMMENT 1'))
update_vals.append(dict(Name='name_b', StartDate='2020-05-26 21:31:16', EndDate='2020-05-26 21:38:37', Comment='TEST COMMENT 2'))
s.bulk_update_mappings(MyTable, update_vals)
s.commit()

where Name, StartDate, and EndDate are all part of the composite pk. 'Comment' is the value to update in the db

Answer 3

The session has function called bulk_insert_mappings and bulk_update_mappings: documentation.

Be aware that you have to provide primary key in mappings

# List of dictionary including primary key
user_mappings = [{
    'user_id': 1, # This is pk?
    'email_address': 'jack@yahoo.com',
    '_id': 1
}, ...]

session.bulk_update_mappings(User, user_mappings)
session.commit()