Order OrderItem Product
-----------------------------------------------------------------------------
id id,orderId,proudctId,unitPrice,quantity id, barcode
JPA eclipseLink:按订单 ID、产品条形码和数量列出订单项:
select * from OrderItem order by orderId asc,
lpad(product.barcode, 20, '0') desc, quantity asc
Query: ReadAllQuery(referenceClass=OrderItem sql="SELECT * FROM (SELECT a.*,
ROWNUM rnum FROM (SELECT DISTINCT t1.ID AS a1, t1.QUANTITY AS a2,
t1.UNITPRICE AS a3, t1.orderId AS a4, t1.productId AS a5, lpad(t0.barcode, ?, ?)
FROM Product t0, OrderItem t1 WHERE (t0.ID = t1.productId) ORDER BY t1.orderId
ASC, lpad(t0.barcode, ?, ?) DESC, t1.QUANTITY ASC) a WHERE ROWNUM <= ?) WHERE
rnum > ?")
错误 ORA-01791:不是选定的表达式
如果在oracle sqlPlus中执行SQL,则没有错误。如果只是按 product.barcode 而不是 lpad(...( 订购,它可以工作。
假设你想按相同的表达式lpad(p.barcode, ?, ?)
排序,改用它的别名。试试这个:
select *
from (
select a.*,
ROWNUM rnum
from (
select distinct o.ID as a1,
o.QUANTITY as a2,
o.UNITPRICE as a3,
o.orderId as a4,
o.productId as a5,
lpad(p.barcode, ?, ?) as a6
from Product p
join OrderItem o on p.ID = o.productId
order by a4,
a6 desc,
a2
) a
where ROWNUM <= ?
)
where rnum > ?
还要注意显式连接语法,它比旧的基于逗号的连接语法和表的重命名别名更现代、更清晰。