Question

我需要从龙卷风的Postgres插入JSON数据，所以这里是这样的测试：

from psycopg2 import connect 

conn = connect("user='pguser' host='localhost' dbname='pgdb' password='pgpass'") 
cursor = conn.cursor() 

data = '[{"id":"sdf","name":"wqe","author":"vb"}]' 

for row in eval(data): 
    print row 
    cursor.execute("""INSERT INTO books(id,name,author) VALUES('%s','%s','%s')""" % \ 
     (row['id'], row['name'], row['author']) 
) 

>>> cursor.execute("SELECT * FROM books") 
>>> cursor.fetchall() 
[('sdf', 'wqe', 'vb')] 
>>> 
$> psql -d pgdb -U pguser -W 
Password for user pguser: 
psql (9.1.6) 
Type "help" for help. 

pgdb=> select * from books; 
id | name | author 
----+------+-------- 
(0 rows) 

正如你可以在Python Shell做select后看到，有一些数据，但在PSQL有 0行！我可能做错了什么？

Python 2.7.2+

Answer 1

您没有提交事务。

Psycopg2自动打开一个事务，并且您必须让它提交以便使数据对其他会话可见。

请参阅the psycopg2 FAQ和connection.commit() method。