hibernate中的双向映射(Bidirectional mapping in hibernate)

 我有两个表，引号和quotation_item。 他们之间有一对多关系。 我的要求是当我执行quotation.setQuotationItem(set) ，应该删除映射到引用的旧quotationItem，并且set中的quotationItems应该映射到引号。 
 
 / * **我的报价pojo就像* ** * / 
 
    public class Quotation {
    int quotationId;
    String code;
    String clientName;
    Set<QuotationItem> quotationItem=new HashSet<QuotationItem>();
    //getter and setter
    }
 
 / * ** QuotationItem POJO * *** / 
 
    public class QuotationItem extends Quotation{
    int id;
    Quotation quotation;
    String itemName;
    int rate;
    int qty;
    //getter and setter
    }
 
 / * * Quotation.hbm * ** * **** / 
 
    <hibernate-mapping>
    <class name="com.paramatrix.pojo.Quotation" table="quotation" >
    <id name="quotationId" type="int" column="quotation_id">
    <generator class="native" />
    </id>
    <property name="code" column="code" type="string" />
    <property name="clientName" column="client_name" type="string" />
    <set name="quotationItem" table="quotation_item" cascade="save-update" inverse="true">
    <key>
    <column name="quotation_id" not-null="true" />
    </key>
    <one-to-many class="com.paramatrix.pojo.QuotationItem" />
    </set>
    </class>
    </hibernate-mapping>
 
 / ** QuotationItem.hbm * ** * ** / 
 
    <class name="com.paramatrix.pojo.QuotationItem" table="quotation_item" dynamic-insert="true">
    <id name="id" type="int" column="id">
    <generator class="native" />
    </id>
    <many-to-one name="quotation" class="com.paramatrix.pojo.Quotation" >
    <column name="quotation_id" not-null="true" />
    </many-to-one>
    <property name="itemName" column="item_name" type="string" />
    <property name="rate" column="rate" type="int" />
    <property name="qty" column="qty" type="int" />
    </class>
 
 我的表格结构与报价类似 
 
 quotation_id code client_name 
 
 我的Quotation_item表格结构 
 
 id quotation_id item_name rate qty 

I have two tables, quotation and quotation_item. There is one to many relationship them. My requirement is when I do quotation.setQuotationItem(set), old quotationItem mapped to quotation should get removed and quotationItems in set should get mapped against quotation.
 
/*** My Quotation pojo is like ****/
 
    public class Quotation {
    int quotationId;
    String code;
    String clientName;
    Set<QuotationItem> quotationItem=new HashSet<QuotationItem>();
    //getter and setter
    }
 
/*** QuotationItem POJO ****/
 
    public class QuotationItem extends Quotation{
    int id;
    Quotation quotation;
    String itemName;
    int rate;
    int qty;
    //getter and setter
    }
 
/** Quotation.hbm ********/
 
    <hibernate-mapping>
    <class name="com.paramatrix.pojo.Quotation" table="quotation" >
    <id name="quotationId" type="int" column="quotation_id">
    <generator class="native" />
    </id>
    <property name="code" column="code" type="string" />
    <property name="clientName" column="client_name" type="string" />
    <set name="quotationItem" table="quotation_item" cascade="save-update" inverse="true">
    <key>
    <column name="quotation_id" not-null="true" />
    </key>
    <one-to-many class="com.paramatrix.pojo.QuotationItem" />
    </set>
    </class>
    </hibernate-mapping>
 
/** QuotationItem.hbm ******/
 
    <class name="com.paramatrix.pojo.QuotationItem" table="quotation_item" dynamic-insert="true">
    <id name="id" type="int" column="id">
    <generator class="native" />
    </id>
    <many-to-one name="quotation" class="com.paramatrix.pojo.Quotation" >
    <column name="quotation_id" not-null="true" />
    </many-to-one>
    <property name="itemName" column="item_name" type="string" />
    <property name="rate" column="rate" type="int" />
    <property name="qty" column="qty" type="int" />
    </class>
 
My tables structure is like for Quotation
 
quotation_id code client_name
 
My table structure for Quotation_item
 
id quotation_id item_name rate qty

原文：https://stackoverflow.com/questions/22334632