Postgresql 来自UUID数组列类型为的psycopy2的错误
在Postgres中将UUID值插入UUID数组列时遇到问题 由于psycopg2不会自动将Python UUID值转换为Postgres UUID,因此我使用类似于Postgresql 来自UUID数组列类型为的psycopy2的错误,postgresql,uuid,psycopg2,Postgresql,Uuid,Psycopg2,在Postgres中将UUID值插入UUID数组列时遇到问题 由于psycopg2不会自动将Python UUID值转换为Postgres UUID,因此我使用类似于str(my_id) 但是,这是我第一次使用任何数组类型的列。我得到的错误是: psycopg2.ProgrammingError: column "items" is of type uuid[] but expression is of type text[] LINE 3: ...0', NULL, '01adae1e-e2c
str(my_id)
但是,这是我第一次使用任何数组类型的列。我得到的错误是:
psycopg2.ProgrammingError: column "items" is of type uuid[] but expression is of type text[]
LINE 3: ...0', NULL, '01adae1e-e2cf-11e4-b773-ac8112c8e1fb', ARRAY['01a...
^
HINT: You will need to rewrite or cast the expression.
我在谷歌上搜索了这个错误,发现了一些(例如)Postgres错误报告,这些报告暗示数组功能的实现不完整/缺失,但我不知道这些是否与我的问题有关。然而,这些问题似乎已经得到解决。FWIW我正在使用Postgres 9.3.6
为了调试它,我创建了一个小测试表,例如:
testdb=# \d test_table
Table "public.test_table"
Column | Type | Modifiers
-----------+---------+-----------
key | integer |
item_list | uuid[] |
以及我的口语测试的输出:
DEBUGGING:
Statement: INSERT INTO test_table
("item_list", "key")
VALUES (%s, %s);
Arguments: [['2f286cea-e34b-11e4-9b5e-2c768ada7efb', '2f28dd7e-e34b-11e4-9b5e-2c768ada7efb'], 1]
Active Role: test1
Mogrified SQL Expression:
INSERT INTO test_table
("item_list", "key")
VALUES (ARRAY['2f286cea-e34b-11e4-9b5e-2c768ada7efb', '2f28dd7e-e34b-11e4-9b5e-2c768ada7efb'], 1);
Exception ProgrammingError occured. Arguments:
('column "item_list" is of type uuid[] but expression is of type text[]\nLINE 3: VALUES (ARRAY[\'2f286cea-e34b-11e4-9b5e-2c768ada7efb\', \'2...\n ^\nHINT: You will need to rewrite or cast the expression.\n',)
* * * * WARNING: Command Failure on Running Statement
INSERT INTO test_table
("item_list", "key")
VALUES (%s, %s);!
ERROR: column "item_list" is of type uuid[] but expression is of type text[]
LINE 3: VALUES (ARRAY['2f286cea-e34b-11e4-9b5e-2c768ada7efb', '2...
^
HINT: You will need to rewrite or cast the expression.
None
Traceback (most recent call last):
File "db-test.py", line 214, in <module>
db_exec(cursor, stmt, args, debug=True, re_raise=True)
File "db-test.py", line 62, in db_exec
cur.execute(stmt, args)
psycopg2.ProgrammingError: column "item_list" is of type uuid[] but expression is of type text[]
LINE 3: VALUES (ARRAY['2f286cea-e34b-11e4-9b5e-2c768ada7efb', '2...
^
HINT: You will need to rewrite or cast the expression.
我已经看到有一种方法可以为Python Postgres添加自定义的“自动”类型转换,我想知道解决方案是否就在这里。。。但我还不知道如何做到这一点。我决定研究psycopg2额外功能,并找到一个只需要额外一行代码的解决方案 提示来自“UUID数据类型”标题下该页面底部附近的 电话是:
psycopg2.extras.register_uuid()
尽管我对简单UUID类型和数组UUID类型的这项工作都很悲观,但它做得很好。此外,这意味着我不再需要手动将每个UUID转换为str(在我的应用程序中,反向转换不是问题,但在检索UUID并将它们注册为python中的UUID类型时,它可能也会起作用)
46 def db_exec(cur, stmt, args=None, re_raise=True, debug=False, assume_role=None):
47 if (cur is None) or (cur is False):
48 print "ERROR : DB Connection/Cursor is not open for commands"
49 return cur
50 if (debug is True):
51 print "DEBUGGING:"
52 print "Statement: ", stmt
53 if args is not None:
54 print "Arguments: ", args
55 try:
56 if assume_role is not None:
57 cur.execute('SET ROLE "%s";' % assume_role)
58 if debug is True:
59 print "Active Role:", GetCurrentRole(cur)
60 print "Mogrified SQL Expression:"
61 print cur.mogrify(stmt, args)
62 cur.execute(stmt, args)
[...snip...]
psycopg2.extras.register_uuid()