New execute_values
method in Psycopg 2.7:
data = [(1,'x'), (2,'y')]
insert_query = 'insert into t (a, b) values %s'
psycopg2.extras.execute_values (
cursor, insert_query, data, template=None, page_size=100
)
The pythonic way of doing it in Psycopg 2.6:
data = [(1,'x'), (2,'y')]
records_list_template = ','.join(['%s'] * len(data))
insert_query = 'insert into t (a, b) values {}'.format(records_list_template)
cursor.execute(insert_query, data)
Explanation: If the data to be inserted is given as a list of tuples like in
data = [(1,'x'), (2,'y')]
then it is already in the exact required format as
the values
syntax of the insert
clause expects a list of records as in
insert into t (a, b) values (1, 'x'),(2, 'y')
Psycopg
adapts a Python tuple
to a Postgresql record
.
The only necessary work is to provide a records list template to be filled by psycopg
# We use the data list to be sure of the template length
records_list_template = ','.join(['%s'] * len(data))
and place it in the insert
query
insert_query = 'insert into t (a, b) values {}'.format(records_list_template)
Printing the insert_query
outputs
insert into t (a, b) values %s,%s
Now to the usual Psycopg
arguments substitution
cursor.execute(insert_query, data)
Or just testing what will be sent to the server
print (cursor.mogrify(insert_query, data).decode('utf8'))
Output:
insert into t (a, b) values (1, 'x'),(2, 'y')