Question

我有一个类和2个多对一映射，我怎么能懒得加载它们

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>

As you can see class Environment has 2 many-to-one's with names ApplicationFolder and 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=?

到目前为止我尝试了哪些方法 1）设置lazy =“no-proxy”，看不到查询数量的任何变化。

2）设置not-found =“exception”。

3）outer-join =“auto”

任何人都可以建议我一个解决方案，以减少因激烈的多对一关系而被解雇的2个额外查询吗？

请注意多对一的外键关系。

Answer 1

默认情况下，

lazy为true。试着摆脱lazy="proxy"。

懒惰的原因不起作用：

当引用的类型无法代理时，因为没有默认构造函数或最终方法
引用的类型与<class lazy="false"

Hibernate多对一延迟加载不起作用

1 个答案: