使用psycopg2

Question

我一直在构建django应用，models.py包含几个模型：

• Customer
• Error
• Record

当我运行python3 manage.py shell时，我没有错误：

From myapp.models import Customer, Error, Record
records = Record.objects.all()
print(len(records))
# the same works if I run the query for Customer, Error, etc.

但是，如果我尝试使用psycopg2进行连接，我发现某些表格无法访问。

cur.execute("select relname from pg_class where relkind='r' and relname !~ '^(pg_|sql_)';")
conn = psycopg2.connect(conn_string)
cursor = conn.cursor()
cursor.execute("select relname from pg_class where relkind='r' and relname !~ '^(pg_|sql_)';")
print cursor.fetchall()

[('django_migrations',),
 ('django_content_type',),
 ('django_admin_log',),
 ('auth_group_permissions',),
 ('auth_group',),
 ('auth_user_groups',),
 ('auth_permission',),
 ('auth_user_user_permissions',),
 ('django_session',),
 ('my_app_contactme',),
 ('my_app_employee',),
 ('auth_user',),
 ('Error',),
 ('my_app_blogpost_category',),
 ('Customer',),
 ('Record',)]

 cur.execute("SELECT * from Customer")

 ---------------------------------------------------------------------------
 ProgrammingError Traceback (most recent call last) <ipython-input-38-3532e0e20e34> in <module>()
 ----> 1 cur.execute("SELECT * from Customer")

 ProgrammingError: relation "customer" does not exist
 LINE 1: SELECT * from Customer

我无法弄清楚为什么Customer，Error和Record会导致通过psycopg2访问时出现问题

Answer 1

我最终在这里找到答案 - psycopg2 cannot find any tables after connection

cur.execute(""" SELECT * from "Customer" """)