例如，現在有商品表，訂單表，兩者是多對多的關系，

--訂單表
create table ORDERS
(
ID NUMBER(8) not null,
TOTAL NUMBER(8,2) not null,
CREATED_DATE VARCHAR2(40) not null,
REALNAME VARCHAR2(20),
TELPHONE VARCHAR2(20),
MOBILE NUMBER(20),
ADDRESS VARCHAR2(200) not null,
POSTCODE VARCHAR2(12),
STATE NUMBER(1),
ACCOUNT_ID VARCHAR2(40),
PAYMENT_ID NUMBER(4),
DELIVERY_ID NUMBER(4),
PAYMENT_STATE NUMBER(1),
MEMO VARCHAR2(400)
)

--商品表

create table PRODUCT
(
ID NUMBER(8) not null,
NAME VARCHAR2(200) not null,
CREATED_DATE VARCHAR2(40),
DESCRIPTION VARCHAR2(4000),
IMAGEURL VARCHAR2(200),
PRICE NUMBER(6,2) not null,
STOCK NUMBER(8),
STATE NUMBER(1) not null,
CATEGORY_ID NUMBER(4) not null,
DISCOUNT NUMBER(2)
)

--中間表

create table ORDERITEM
(
ORDER_ID NUMBER(8),
PRODUCT_ID NUMBER(8),
ORIGIN_PRICE NUMBER(6,2),
PRICE NUMBER(6,2),
QUANTITY NUMBER(6),
ID VARCHAR2(40) not null
)

傳統的多對多映射會在order.hbm.xml中這樣設置：

<set name="products"table="orderitem">
<keycolumn="order_id"></key>
<many-to-manyclass="com.shop.model.Product">
<columnname="product_id"></column>
</many-to-many>
</set>

但是，此時中間表orderitem中多了三個字段,此時就不能用上面這種方法了，

那么就可以轉化成兩個一對多（或者說兩個多對一）

步驟：

1.生成orderitem的POJO類，并改造成如下內容：

public class Orderitem implementsjava.io.Serializable {

// Fields

private String id;
private Double originPrice;
private Double price;
private Long quantity;
private Order order;
private Product product;

// Constructors

public Orderitem() {
}

// Property accessors

public String getId() {
return this.id;
}

public void setId(String id) {
this.id = id;
}

public Double getOriginPrice() {
return this.originPrice;
}

public void setOriginPrice(Double originPrice){
this.originPrice = originPrice;
}

public Double getPrice() {
return this.price;
}

public void setPrice(Double price) {
this.price = price;
}

public Long getQuantity() {
return this.quantity;
}

public void setQuantity(Long quantity) {
this.quantity = quantity;
}

public Order getOrder() {
return order;
}

public void setOrder(Order order) {
this.order = order;
}

public Product getProduct() {
return product;
}

public void setProduct(Product product) {
this.product = product;
}

2.配置映射文件

<?xml version="1.0"encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="com.shop.model.Orderitem"table="ORDERITEM" schema="STORE">
<id name="id"type="java.lang.String">
<column name="ID" length="10"/>
<generatorclass="uuid.hex"></generator>
</id>
<property name="originPrice"type="java.lang.Double">
<column name="ORIGIN_PRICE" precision="6"/>
</property>
<property name="price"type="java.lang.Double">
<column name="PRICE" precision="6"/>
</property>
<property name="quantity" type="java.

lang.Long">
<column name="QUANTITY" precision="6" scale="0"/>
</property>

<many-to-one name="order"class="com.shop.model.Order"
cascade="save-update" >
<columnname="order_Id"></column>
</many-to-one>
<many-to-one name="product"class="com.shop.model.Product">
<columnname="product_Id"></column>
</many-to-one>
</class>
</hibernate-mapping>

3.接下來就變成多對一事務操作了（當然，從另一個方向看，就是一對多了） 《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

總結

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