我在postgres中有一个枚举。它是通过sql alchemy定义的,如:
sa.Column('state', postgresql.ENUM(u'ACTIVE', u'STOPPED', u'FAILED', name='ProcessState'), nullable=True),
我无法删除它,但它似乎也不存在:
database=# select NULL :: ProcessState;
ERROR: type "processstate" does not exist
LINE 1: select NULL :: ProcessState
^
database=# SELECT n.nspname AS "schema", t.typname
, string_agg(e.enumlabel, '|' ORDER BY e.enumsortorder) AS enum_labels
FROM pg_catalog.pg_type t
JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
JOIN pg_catalog.pg_enum e ON t.oid = e.enumtypid
GROUP BY 1,2;
schema | typname | enum_labels
--------+-----------+-----------------------
public | ProcessState | ACTIVE|STOPPED|FAILED
(1 row)
database=# drop type public.ProcessState;
ERROR: type "public.processstate" does not exist
database=# drop type ProcessState;
ERROR: type "processstate" does not exist
我不知所措。它似乎存在并且不存在于同一时间,我无法删除它,或重新添加它。使用SQL Alchemy重新添加会导致错误:
File "python2.7/site-packages/sqlalchemy/engine/default.py", line 462, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) type "ProcessState" already exists
[SQL: 'CREATE TYPE "ProcessState" AS ENUM (\'ACTIVE\', \'STOPPED\', \'FAILED\')']
任何想法是怎么回事?任何想法如何解决这一问题?我希望能够可靠地添加此类型并将其删除(无需删除整个数据库)。
答案 0 :(得分:3)
看起来SQLAlchemy使用引号将此类型写入数据库(请参阅错误消息中的SQL)。
尝试:
DROP TYPE "ProcessState";