Question

我试图在SQLAlchemy中为Oracle 12CR1数据库生成以下设计的DML语句：

INSERT INTO baz (name, qty)
WITH bar AS (
    SELECT bar.name, bar.qty
    FROM bar
)
SELECT foo.name, bar.qty
FROM foo JOIN bar ON foo.name = bar.name

但是，SQLAlchemy似乎不按顺序生成它，如下所示：

WITH bar AS (
    SELECT bar.name, bar.qty
    FROM bar
)
INSERT INTO baz (name, qty)
SELECT foo.name, bar.qty
FROM foo JOIN bar ON foo.name = bar.name

使用ORA-00923: FROM keyword not found where expected执行此操作失败。

我的理论是SQLAlchemy假定PostgreSQL语法为WITH ... INSERT INTO ... SELECT ...，并且不遵守INSERT INTO ... WITH ... SELECT ...的Oracle语法。

有没有办法让这个与Oracle合作，或者至少是一种修改insert().from_select()编译方式的方法？

重现：

from sqlalchemy import (Table, Column, String, Integer,
                    MetaData, select, func)
from sqlalchemy.dialects import oracle


metadata = MetaData()

foo = Table('foo', metadata, Column('name', String))
bar = Table('bar', metadata, Column('name', String), Column('qty', Integer))
baz = Table('baz', metadata, Column('name', String), Column('qty', Integer))

with_bar = select([bar.c.name, bar.c.qty]).cte('bar')
sel = select([foo.c.name, with_bar.c.qty])
sel = sel.select_from(
        foo.join(with_bar, 
                 foo.c.name == with_bar.c.name
                 )
)

ins = baz.insert().from_select([baz.c.name, baz.c.qty], sel)
print ins.compile(dialect=oracle.dialect())

带有子句的SQLAlchemy With Clause（CTE）未正确编译Oracle

0 个答案: