Question

请帮助了解如何为该MySQL查询编写JPA查询

select car_xid from t_booking where from_date between '06/23/2019' and 
'06/24/2019' 
or to_date between '06/23/2019' and '06/24/2019'  or from_date <  
'06/23/2019' or to_date > '06/24/2019'

在MySQL中，此查询返回car_xid为1；

我有Booking Bean，它映射到MySQL DB中的t_booking表和Cars表，该表已映射到MySQL DB中的t_cars

车豆：

@Entity
@Table(name="m_cars")
public class Cars {

public Cars() {
}
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name="car_pid")
private int carPid;

@Column(name="car_number")
private String carNumer;

@Column(name="car_name")
private String carName;

@Column(name="car_type")
private String carType;

@Column(name="passenger_number")
private int paxNumbers;

@Column(name="available_from")  
private Date availableFrom;

@Column(name="available_to")
private Date availableTo;

@Column(name="rates")
private float ratesPeHour;

@Column(name="deposite")
private float deposite;

@Column(name="is_active")
private char isActive;

@Column(name="from_city")
private String fromCity;

@Column(name="to_city")
private String toCity;

@Column(name="img_url")
private String imgUrl;
}

Booking Bean：

@Entity
@Table(name="t_booking")
public class Booking {

public Booking() {
}

@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name="booking_pid")
private int bookingPid;

@OneToOne
@JoinColumn(name="user_xid")
private User user; 

@Column(name="from_city")
private String fromCity;

@Column(name="to_City")
private String toCity;

@Column(name="from_date")
private Date fromDate;

@Column(name="to_date")
private Date toDate;

@Column(name="car_number")
private String carNumber;

@Column(name="deposite")
private float deposite;

@Column(name="passenger_number")
private int paxNumber;

@Column(name="from_loc")
private String fromLoc;

@Column(name="to_loc")
private String toLoc;

@OneToOne
@JoinColumn(name="car_xid")
private Cars cars;

@Column(name="transaction_id")
private String transactionId;

@Column(name="total_amount")
private float totalAmount;

}

我已经尝试过JPA查询

public interface BookingRepo extends JpaRepository<Booking, Integer>{

    @Query("select b.cars.carPid from Booking b,Cars car where b.fromDate 
    between ?1 and ?2 or b.toDate between ?3 and ?4 or b.fromDate < ?5 and 
    b.toDate > ?6")
    List<Integer> getBookedCarId(Date fromDate,Date toDate,Date from,Date 
    to,Date frmDate,Date tDate);    
}

此返回null，但实际上应该返回1。

Actual result = JPA Query返回空值。

expected result =应该返回car_xid为1

Answer 1

尝试这个。如您所见，在where子句中不需要Cars：为Booking Table创建对象

@Query("select b.cars.carPid from Booking b where b.fromDate between ?1 and ?2 or b.toDate between ?3 and ?4 or b.fromDate < ?5 and b.toDate > ?6")
List<Integer> getBookedCarId(Date fromDate, Date toDate, Date from, Date to, Date frmDate, Date tDate);

请就以下JPA查询问题提出建议

1 个答案: