python json dumps plaatst object in object op row_to_json return

Dat is wat er gebeurt als je de hele resultatenset dumpt. Met de t tafel:

create table t (a int, b text);
insert into t (a, b) values (1,'x'), (2,'y');

Psycopg2 gebruiken:

query = "select row_to_json(t) from t"
cursor.execute(query)
rs = cursor.fetchall()

# dump the whole result set
print json.dumps(rs)
print

# dump each column:
for r in rs:
    print json.dumps(r[0])
con.close()

Uitgang:

[[{"a": 1, "b": "x"}], [{"a": 2, "b": "y"}]]

{"a": 1, "b": "x"}
{"a": 2, "b": "y"}