Updating multiple columns in Sqlalchemy
13,893
Solution 1
Multiple columns can be updated using the Session as:
def update_table(session, val1, val2, val3):
session.query(Table).filter_by(col=val1).update(dict(col2=val2,col3=val3))
session.commit()
Solution 2
you can write more generic function which will accept your table object, WHERE criteria and the actual update values. Something like
def get_update_query(table_name, where_vals, update_vals):
query = table_name.update()
for k, v in where_vals.iteritems():
query = query.where(getattr(table_name.c, k) == v)
return query.values(**update_vals)
table = YourTable
where_vals = {'col1': 'foo', 'col2': 'bar'}
update_vals = {'col1': 'foo_updated', 'col2': 'bar_updated'}
res = get_update_query(YourTable, where_vals, update_vals)
# UPDATE "YourTable" SET col1=:col1, col2=:col2 WHERE "YourTable".col1 = :col1_1 AND "YourTable".col2 = :col2_1
Author by
user3527975
Updated on June 04, 2022Comments
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user3527975 almost 2 years
I have an app that runs on flask and uses sqlalchemy to interact with the data base. I want to update the columns of a table with the user specified values. The query that I am using is
def update_table(value1, value2, value3): query = update(Table).where(Table.column1 == value1).values(Table.column2 = value2, Table.column3 = value3)
I am not sure if the way I am passing values is correct. Also the Table.column2/3 i=gives error saying
Can't assign to function call
. Where column2/3 are not functions, they're field names. So, how do I update multiple values and why is it giving error here?PS: I referred the sqlalchemy doc