如何使用pyscopg2在PostgreSQL中创建表?

时间:2017-05-31 15:17:01

标签: python postgresql docker psycopg2

我正在运行包含postgres即服务的Docker Compose应用程序。以下是docker-compose.yml的一部分:

version: '3'

services:
  postgres:
    image: postgres
    environment:
      - POSTGRES_PASSWORD=foo
    ports:
      - 5432:5432

docker-compose build后跟docker-compose up后,如果我docker ps,我看到容器正在运行:

kurt@kurt-ThinkPad:~$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
8a7a20686728        postgres            "docker-entrypoint..."   28 minutes ago      Up 17 seconds       0.0.0.0:5432->5432/tcp   apkapi_postgres_1

由于端口5432映射到localhost,我想我可以执行以下操作(在ipython中):

In [1]: import psycopg2

In [2]: conn = psycopg2.connect(dbname="postgres", user="postgres", password="fo
   ...: o", host="localhost")

In [3]: cursor = conn.cursor()

In [4]: cursor.execute("CREATE TABLE apks (s3_uri text);")

所有这些命令执行时没有任何错误。为了检查结果,我尝试了(使用docker ps中的容器ID):

kurt@kurt-ThinkPad:~$ docker exec -it 8a7a20686728 bash
root@8a7a20686728:/# psql -U postgres
psql (9.6.3)
Type "help" for help.

postgres=# \l
                                 List of databases
   Name    |  Owner   | Encoding |  Collate   |   Ctype    |   Access privileges   
-----------+----------+----------+------------+------------+-----------------------
 postgres  | postgres | UTF8     | en_US.utf8 | en_US.utf8 | 
 template0 | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
           |          |          |            |            | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
           |          |          |            |            | postgres=CTc/postgres
(3 rows)

postgres=# \c postgres
You are now connected to database "postgres" as user "postgres".
postgres=# \dt
          List of relations
 Schema |  Name   | Type  |  Owner   
--------+---------+-------+----------
 public | mytable | table | postgres
(1 row)

问题是我看到之前创建的表mytable,而不是我尝试使用apks创建的表psycopg2。我没有正确创建表吗?

1 个答案:

答案 0 :(得分:4)

听起来您可能没有启用自动提交,因此您对数据库所做的任何更改都不会被保存。尝试使用conn.autocommit = True启用它,或者在执行命令conn.commit()之后启用它。