[英]Order and OrderLine Relationship mapping in Hibernate. Where to put @OnetoMany and/or @ManytoOne
I have to make Hibernate Entities for following Requirement. 我必须按照以下要求创建休眠实体。 I am confused in Relationship between Order and OrderLine Tables.
我对Order和OrderLine表之间的关系感到困惑。 Currently I am assuming Order(one) to OrderLine(Many) Relationship but don't know for sure.
目前,我假设Order(one)与OrderLine(Many)的关系,但不确定。
package com.prax.dto;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@Entity(name="ORDERLINE")
public class OrderLine {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="ORDER_ID")
private String orderId;
@Column(name="PRODUCT_ID")
private String product;
@Column(name="UNITPRICE")
private double unitPrice;
@Column(name="TOTALPRICE")
private double totalPrice;
@Column(name="QUANTITY")
private int quantity;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="ORDER_ID", nullable=false)
private SalesOrder salesOrderMap;
public OrderLine(){}
public String getOrderId() {
return orderId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
public String getProduct() {
return product;
}
public void setProduct(String product) {
this.product = product;
}
public double getUnitPrice() {
return unitPrice;
}
public void setUnitPrice(double unitPrice) {
this.unitPrice = unitPrice;
}
public double getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(double totalPrice) {
this.totalPrice = totalPrice;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public SalesOrder getSalesOrderMap() {
return salesOrderMap;
}
public void setSalesOrderMap(SalesOrder salesOrderMap) {
this.salesOrderMap = salesOrderMap;
}
@Override
public String toString() {
return "OrderLine [orderId=" + orderId + ", product=" + product
+ ", unitPrice=" + unitPrice + ", totalPrice=" + totalPrice
+ ", quantity=" + quantity + ", salesOrderMap=" + salesOrderMap
+ "]";
}
}
package com.prax.dto;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="SALESORDER")
public class SalesOrder {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="ORDER_ID")
private String orderNumber;
@Column(name="CUSTOMER_ID")
private String customer;
@Column(name="TOTALPRICE")
private double totalPrice;
@OneToMany(mappedBy="salesOrderMap")
private List<OrderLine> orderLines;
public String getOrderNumber() {
return orderNumber;
}
public void setOrderNumber(String orderNumber) {
this.orderNumber = orderNumber;
}
public String getCustomer() {
return customer;
}
public void setCustomer(String customer) {
this.customer = customer;
}
public double getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(double totalPrice) {
this.totalPrice = totalPrice;
}
public List<OrderLine> getOrderLines() {
return orderLines;
}
public void setOrderLines(List<OrderLine> orderLines) {
this.orderLines = orderLines;
}
@Override
public String toString() {
return "SalesOrder [orderNumber=" + orderNumber + ", customer="
+ customer + ", totalPrice=" + totalPrice + ", orderLines="
+ orderLines + "]";
}
}
My SalesOrder Class 我的SalesOrder类
import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="SALESORDER")
public class SalesOrder {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="ORDER_ID")
private String orderNumber;
@Column(name="CUSTOMER_ID")
private String customer;
@Column(name="TOTALPRICE")
private double totalPrice;
@OneToMany(mappedBy="salesOrderMap")
private List<OrderLine> orderLines;
public String getOrderNumber() {
return orderNumber;
}
public void setOrderNumber(String orderNumber) {
this.orderNumber = orderNumber;
}
public String getCustomer() {
return customer;
}
public void setCustomer(String customer) {
this.customer = customer;
}
public double getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(double totalPrice) {
this.totalPrice = totalPrice;
}
public List<OrderLine> getOrderLines() {
return orderLines;
}
public void setOrderLines(List<OrderLine> orderLines) {
this.orderLines = orderLines;
}
@Override
public String toString() {
return "SalesOrder [orderNumber=" + orderNumber + ", customer="
+ customer + ", totalPrice=" + totalPrice + ", orderLines="
+ orderLines + "]";
}
}
I am getting below exception 我在例外之下
Repeated column in mapping for entity:
com.prax.dto.OrderLine
column:ORDER_ID
(should be mapped withinsert="false"
update="false"
)实体的映射中重复的列:
com.prax.dto.OrderLine
列:ORDER_ID
(应使用insert="false"
update="false"
映射)
An order has many lines. 订单有很多行。 The column ORDER_ID in the LINE table is the join column.
LINE表中的ORDER_ID列是联接列。 So all the lines of the order 42 contain 42 in their ORDER_ID column.
因此,订单42的所有行的ORDER_ID列均包含42。 That's is right.
没错
But you're also saying Hibernate that this same ORDER_ID column constitutes the ID of OrderLine. 但是,您也要说Hibernate,这个相同的ORDER_ID列构成OrderLine的ID。 So, an OrderLine is supposed to be uniquely identified by its ORDER_ID.
因此,OrderLine应该由其ORDER_ID唯一标识。 That is clearly not possible.
这显然是不可能的。 You need another ID column i the line table that uniquely identifies a line.
您需要在行表中唯一标识一行的另一个ID列。
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