hibernate常用关联

<?xml version="1.0"  encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Contract.Domain.Teacher,CCRModel" table="TEACHER">
    <id name="Id" type="int" column="Id"  >
      <generator class="native" />
    </id>
    <property name="TName" column="T_NAME" />
    <bag name="Students" cascade="all">
      <key column="TEACHER_ID" not-null="true"/>
      <one-to-many class="Contract.Domain.Student"/>
    </bag>
  </class>
  
</hibernate-mapping>


<?xml version="1.0"  encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Contract.Domain.Student,CCRModel" table="STUDENT">
    <id name="Id" type="int" column="Id"  >
      <generator class="native" />
    </id>
    <property name="SName" column="S_NAME" />


    <many-to-one name="Teacher" class="Contract.Domain.Teacher"  column="TEACHER_ID"  not-null="true"/>
  </class>
  
</hibernate-mapping>


 var session1 = Dao.GetSession();
            
            Teacher t = new Teacher() { TName = "laoshi" };

            Student s1 = new Student() { SName = "t1" };

            Student s2 = new Student() { SName = "t2" };

            t.Students = new List<Student>();
            t.Students.Add(s1);
            t.Students.Add(s2);

            s1.Teacher = t;
            s2.Teacher = t;

            session1.SaveOrUpdate(t);

            session1.Flush();

            var gt=session1.Get<Teacher>(106309155);

            var stu = session1.Get<Student>(106309157);
           
            return;

多对多 关系拆分 分为1和2和3三个步骤，其中BasIssuer和BasCreditRating两个都是一端各自拥有一个1对多的关系，而中间实体是多端配置有两个多对一的关系
1.
<?xml version="1.0"  encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Contract.Domain.BasIssuer,BASModel" table="BAS_ISSUER">
    <id name="Id"  column="ISSUER_ID" unsaved-value="null">
      <generator class="sequence" >
        <param name="sequence">BAS_MODULE_SEQ</param>
      </generator>
    </id>
    <property name="IssuerCode" column="ISSUER_CODE" />
    <property name="IssuerName" column="ISSUER_NAME" />
    <!--<property name="Region" column="REGION_ID" />-->
    <property name="CreateUid" column="CREATE_UID" />
    <property name="CreateUname" column="CREATE_UNAME" />
    <property name="CreateOid" column="CREATE_OID" />
    <property name="CreatePid" column="CREATE_PID" />
    <property name="CreateDate" column="CREATE_DATE" />
    <property name="LastModUid" column="LAST_MOD_UID" />
    <property name="LastModUname" column="LAST_MOD_UNAME" />
    <property name="LastModOid" column="LAST_MOD_OID" />
    <property name="LastModPid" column="LAST_MOD_PID" />
    <property name="LastModDatetime" column="LAST_MOD_DATETIME" />
    <property name="Status" column="STATUS" />
    <property name="IsDeleted" column="IS_DELETED"/>
    <!--<property name="CreditRate" column="CREDIT_RATE" />-->
    <!--<property name="CreditAgencyId" column="CREDIT_AGENCY_ID" />-->
    <property name="IssuerType" column="ISSUER_TYPE" />
    <!--<property name="IndustrySectorId" column="INDUSTRY_SECTOR_ID" />-->
    <property name="CreatedEmployeeName" column="CREATED_EMPLOYEE_NAME" update="false"/>
    <property name="CreatedEmployeeId" column="CREATED_EMPLOYEE_ID" update="false"/>

    <many-to-one name="Region" class="Contract.Domain.BasRegion" column="REGION_ID"/>
    <many-to-one name="IndustrySector" class="Contract.Domain.BasSectorInfo" column="INDUSTRY_SECTOR_ID"/>

    <bag name="IssuerRating"  cascade="all">
      <key column="E_ID" />
      <one-to-many class="Contract.Domain.RealCreditEntity,BASModel" />
    </bag>
  </class>
</hibernate-mapping>
2.
<?xml version="1.0"  encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Contract.Domain.BasCreditRating,BasModel" table="BAS_CREDIT_RATING">
    <id name="Id" type="string" column="Id" unsaved-value="null">
      <generator class="sequence" >
        <param name="sequence">BAS_MODULE_SEQ</param>
      </generator>
    </id>
    <property name="CreditRatingCode" >
      <column name="CREDIT_RATING_CODE">
        <comment>
          信用评级编码
        </comment>
      </column>
    </property>
    <property name="CreditRatingName" >
      <column name="CREDIT_RATING_NAME">
        <comment>
          信用评级名称
        </comment>
      </column>
    </property>
    <property name="RatingTypeLookupId" >
      <column name="RATING_TYPE_LOOKUP_ID">
        <comment>
          评级类型ID
        </comment>
      </column>
    </property>
    <!--<property name="CreditRatingAgencyId" >
      <column name="CREDIT_RATING_AGENCY_ID">
        <comment>
          评级机构ID
        </comment>
      </column>
    </property>-->
    <property name="CreditRatingValue" >
      <column name="CREDIT_RATING_VALUE">
        <comment>
          评级分数
        </comment>
      </column>
    </property>
    <property name="Remarks" >
      <column name="REMARKS">
        <comment>
          备注
        </comment>
      </column>
    </property>
    <property name="CreatedBy" >
      <column name="CREATED_BY">
        <comment>
          创建人
        </comment>
      </column>
    </property>

    <property name="CreateDate" update="false">
      <column name="CREATE_DATE">
        <comment>
          创建日期
        </comment>
      </column>
    </property>
    <property name="UpdatedBy" >
      <column name="UPDATED_BY">
        <comment>
          更新人
        </comment>
      </column>
    </property>
    <property name="UpdateDate" >
      <column name="UPDATE_DATE">
        <comment>
          更新日期
        </comment>
      </column>
    </property>

    <property name="CreatedEmployeeName" update="false">
      <column name="CREATED_EMPLOYEE_NAME">
        <comment>
          created_employee_name
        </comment>
      </column>
    </property>

    <property name="CreatedEmployeeId" update="false">
      <column name="CREATED_EMPLOYEE_ID">
        <comment>
          created_employee_id
        </comment>
      </column>
    </property>
    <property name="Version" >
      <column name="VERSION">
        <comment>
          评级版本
        </comment>
      </column>
    </property>
    <property name="IsDeleted" >
      <column name="IS_DELETED">
        <comment>
          假删除标记
        </comment>
      </column>
    </property>
    <bag name="RatingIssuer" >
      <key column="C_ID" />
      <one-to-many class="Contract.Domain.RealCreditEntity,BASModel" />
    </bag>
    <many-to-one name="CreditRatingAgency" class="Contract.Domain.BasCreditRatingAgency" column="CREDIT_RATING_AGENCY_ID"/>

  </class>
</hibernate-mapping>
3.
<?xml version="1.0"  encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Contract.Domain.RealCreditEntity,BASModel" table="RELA_CREDIT_ENTITY">
    <id name="Id"  column="ID" unsaved-value="null">
      <generator class="sequence" >
        <param name="sequence">BAS_MODULE_SEQ</param>
      </generator>
    </id>
    <property name="RatingDate" column="RATING_DATE" />
    <many-to-one name="Issuer" class="Contract.Domain.BasIssuer" column="E_ID"/>
    <many-to-one name="Rating" class="Contract.Domain.BasCreditRating" column="C_ID"/>
  </class>
</hibernate-mapping>