SQLAlchemy-使用字典列表更新表

Question

I have a table containing user data and I would like to update information for many of the users using a list of dictionaries. At the moment I am using a for loop to send an update statement one dictionary at a time, but it is slow and I am hoping that there is a bulk method to do this.

user_data = [{'user_id' : '12345', 'user_name' : 'John'}, {'user_id' : '11223', 'user_name' : 'Andy'}]   

connection = engine.connect()
metadata = MetaData()

for row in user_data:
        stmt = update(users_table).where(users_table.columns.user_id == row['user_id'])
        results = connection.execute(stmt, row)

Thanks in advance!

Answer 1

from sqlalchemy.sql.expression import bindparam

connection = engine.connect()

stmt = users_table.update().\
where(users_table.c.id == bindparam('_id')).\
values({
    'user_id': bindparam('user_id'),
    'user_name': bindparam('user_name'),
})

connection.execute(stmt, [
{'user_id' : '12345', 'user_name' : 'John', '_id': '12345'},
{'user_id' : '11223', 'user_name' : 'Andy', '_id': '11223'}

])