Hibernate 多对一延迟加载不起作用

Question

我有一个类和2个多对一映射，我怎样才能延迟加载它们

我的属性

**teneo.mapping.also_map_as_class=true
teneo.mapping.set_proxy=true
teneo.mapping.mapping_file_name=/lazy.hbm.xml**

映射文件(lazy.hbm.xml)

<class name="EnvironmentImpl" entity-name="**Environment**" abstract="false" lazy="true" discriminator-value="Environment" table="`ENVIRONMENT`" proxy="Environment">
    <meta attribute="eclassName">Environment</meta>

    <property name="name" lazy="false" insert="true" update="true" not-null="true" unique="false" type="java.lang.String">
        <column not-null="true" unique="false" name="`NAME`"/>
    </property>

    <property name="description" lazy="false" insert="true" update="true" not-null="false" unique="false" type="java.lang.String">
        <column not-null="false" unique="false" name="`DESCRIPTION`" length="512"/>
    </property>

    <property name="contact" lazy="false" insert="true" update="true" not-null="false" unique="false" type="java.lang.String">
        <column not-null="false" unique="false" name="`CONTACT`"/>
    </property>

    <many-to-one  name="rootAppFolder" entity-name="ApplicationFolder" lazy="proxy" cascade="all" foreign-key="ENVIRONMENT_ROOTAPPFOLDER" insert="true" update="true" not-null="false" unique="true">
        <column not-null="false" unique="false" name="`APPLICATINFLDER_RTAPPFOLDER_ID`"/>
    </many-to-one>

    <many-to-one name="serviceVirtualization" entity-name="ServiceVirtualization" lazy="proxy" cascade="all" foreign-key="ENVIRNMENT_SERVICEVIRTALIZATIN" insert="true" update="true" not-null="false">
        <column not-null="false" unique="false" name="`SRVCVRTLZTN_SRVICVIRTLIZTIN_ID`"/>
    </many-to-one>
</class>

如您所见，Environment 类有 2 个多对一的名称 ApplicationFolder 和 serviceVirtualization。

for a HQL query like -  from Environment where name = :name


    Which internally triggers 3 queries  
    Query1 : Environment ( this is right)

    Query2 : ApplicationFolder ( wrong.lazy loading should not.)

    Query 3 : serviceVirtualization ( wrong.lazy loading should not.)



            DEBUG - select environmen0_."NAME" as NAME4_31_, environmen0_."DESCRIPTION" as DESCRIPT5_31_, environmen0_."CONTACT" as CONTACT6_31_, environmen0_."APPLICATINFLDER_RTAPPFOLDER_ID" as APPLICAT7_31_, environmen0_."SRVCVRTLZTN_SRVICVIRTLIZTIN_ID" as SRVCVRTL8_31_ from "ENVIRONMENT" environmen0_ where environmen0_."NAME"=?

            DEBUG - select applicatio0_.e_id as e1_43_0_, applicatio0_.version_ as version3_43_0_, applicatio0_."NAME" as NAME4_43_0_, applicatio0_."ENVIRONMENT_ENV_E_ID" as ENVIRONM5_43_0_ as APPLICAT8_43_0_ from "APPLICATIONFOLDER" applicatio0_ where applicatio0_.e_id=?

            DEBUG - select servicevir0_.e_id as e1_35_0_, servicevir0_.version_ as version3_35_0_, servicevir0_.econtainer_class as econtainer4_35_0_, servicevir0_.e_container as e5_35_0_, servicevir0_.e_container_featureid as e6_35_0_ from "SERVICEVIRTUALIZATION" servicevir0_ where servicevir0_.e_id=?

到目前为止我尝试过哪些方法 1)设置lazy=“no-proxy”，没有看到查询数量有任何变化。

2) 设置 not-found="异常(exception)"。

3)外连接=“自动”

任何人都可以建议我一种解决方案来减少由于急切的多对一关系而被解雇的两个额外查询吗？

请记下多对一的外键关系。

Answer 1

lazy 默认为 true。尝试摆脱 lazy="proxy" .

懒惰不工作的原因:

• 当引用类型因没有默认构造函数或 final方法而无法代理时
• 引用的类型映射为 <class lazy="false"