Python SqlAlchemy不能使用NULL值插入ARRAY(postgres)?

use*_*560 5 python postgresql sqlalchemy

我正在使用多维数组,并且我注意到postgres需要强制转换表达式以插入值,例如:

CREATE TABLE test (
    pay  integer[]
);
CREATE TABLE

INSERT INTO test values (ARRAY[NULL]);
ERROR:  column "pay" is of type integer[] but expression is of type text[]
LINE 1: INSERT INTO test values (ARRAY[NULL]);
                                 ^
HINT:  You will need to rewrite or cast the expression.

INSERT INTO test values (ARRAY[NULL::integer]); -- How to do this on SqlAlchemy ?
INSERT 0 1                                      -- ARRAY[NULL]::integer[] would also works
Run Code Online (Sandbox Code Playgroud)

这就是我添加对象时SqlAlchemy所做的事情,如果VALUE为NULL,则不会进行类型转换。这是我的代码的一部分:

from sqlalchemy.dialects.postgresql import ARRAY
class Test (Base):

    __tablename__ = 'test'

    pay = Column(ARRAY(Integer))

member = Test()
member.pay = [None]
session.add(member)
session.commit()
Run Code Online (Sandbox Code Playgroud)

然后在postgres日志中,我得到:

ERROR:  column "pay" is of type integer[] but expression is of type text[] at character 26
HINT:  You will need to rewrite or cast the expression.
STATEMENT:  INSERT INTO test (pay) VALUES (ARRAY[NULL]);  -- See ?? No casting from SqlAlchemy
Run Code Online (Sandbox Code Playgroud)

所以问题是:当列表中的值为None时,我还能为SqlAlchemy进行类型转换吗?也许一些自定义类型的实现?

Eog*_*anM 2

这似乎是 psycopg2 中的一个遗漏;从 2.4.6 升级到 2.6.2 修复了这个问题。当然要感谢 SQLA 作者 @zzzeek