我有以下数据： -
Product Reason Qty
Pepsi IN 10
Pepsi Out 2
Pepsi In 15
Pepsi Out 5
Coke IN 100
Coke Out 20
Coke In 35
Coke Out 25
从JPA规范我想在下面执行以下查询： -
select * from (
(select SUM(QTY) from stock where reason like 'IN') as INDATA -
(select SUM(QTY) from stock where reason like 'OUT') as OUTDATA
) as TBL;
结果如下： -
Product Qty
Pepsi 18
Coke 90
我第一次使用JPA规范，我不知道如何执行查询以从库存表中获取当前库存。
答案 0 :(得分：0)
假设您有一个'，比如Entity，则会将上述表Beverage映射为：{/ p>
Stock您可以使用@Entity
@Table(name="Stock")
class Beverage {
public Beverage(String brand, String reason, int quantity) {
this.brand = brand;
this.reason = reason;
this.quantity = quantity;
}
public Beverage() {}
@Id
@GeneratedValue
Integer id;
String brand;
String reason;
int quantity;
}
下面的case statement along with sum：
JPQL