这是启用延迟加载插件
<plugin>
<groupId>org.hibernate.orm.tooling</groupId>
<artifactId>hibernate-enhance-maven-plugin</artifactId>
<version>${hibernate.version}</version>
<executions>
<execution>
<configuration>
<!--<failOnError>true</failOnError>-->
<enableLazyInitialization>true</enableLazyInitialization>
<!--<enableDirtyTracking>true</enableDirtyTracking>-->
<!--<enableAssociationManagement>true</enableAssociationManagement>-->
</configuration>
<goals>
<goal>enhance</goal>
</goals>
</execution>
</executions>
</plugin>
基于Hibernate java的配置属性如下
private Properties hibernateProperties(DataSourceConfiguration dataSourceConfiguration) {
Properties properties = new Properties();
// properties.setProperty("hibernate.hbm2ddl.auto", dataSourceConfiguration.getDdlGeneration());
properties.put("hibernate.dialect", dataSourceConfiguration.getDialect());
properties.put("hibernate.enable_lazy_load_no_trans", true);
properties.put("hibernate.jpa.compliance.transaction", true);
properties.put("hibernate.jpa.compliance.query", true);
properties.put("hibernate.jdbc.batch_size", 30);
properties.put("hibernate.order_inserts", true);
properties.put("hibernate.jdbc.batch_versioned_data", true);
properties.put("hibernate.ejb.use_class_enhancer",true);
properties.put("hibernate.enhancer.enableLazyInitialization",true);
// properties.setProperty("hibernate.enhancer.enableAssociationManagement","true");
properties.put("hibernate.current_session_context_class", dataSourceConfiguration.getCurrentSession());
properties.put("hibernate.show_sql", dataSourceConfiguration.getShowsql());
properties.put("hibernate.format_sql", dataSourceConfiguration.getFormatsql());
properties.put("hibernate.discriminator.ignore_explicit_for_joined", "true");
return properties;
}
这是persistance.xml
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd“> org.hibernate.jpa.HibernatePersistenceProvider
<non-jta-data-source></non-jta-data-source>
<properties>
<!--<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/hcs?useSSL=false"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>-->
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/hcs?useSSL=false"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value="root"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.show_sql" value="true"/>
<!--<property name="spring.jpa.properties.hibernate.ejb.use_class_enhancer" value="true"/>-->
<!--<property name="hibernate.enhancer.enableLazyInitialization" value="true"/>-->
<!-- <property name="hibernate.hbm2ddl.auto" value="validate"/>-->
<property name="hibernate.discriminator.ignore_explicit_for_joined" value="true"/>
</properties>
</persistence-unit>
</persistence>
在运行时，我遇到以下异常
org.springframework.beans.factory.BeanCreationException：在com.orsbv.hcs.config.HCSRepositoryContext中定义的名称为'entityManagerFactory'的bean创建时出错：调用init方法失败；嵌套异常为java.lang.IllegalStateException：必须以Java代理开头才能使用InstrumentationLoadTimeWeaver。参见Spring文档。 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1704） 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:583） 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:502） 在org.springframework.beans.factory.support.AbstractBeanFactory.lambda $ doGetBean $ 0（AbstractBeanFactory.java:312） 在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:228） 在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:310） 在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:200） 在org.springframework.context.support.AbstractApplicationContext.getBean（AbstractApplicationContext.java:1083） 在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:858） 在org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:549） 在org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext（ContextLoader.java:409） 在org.springframework.web.context.ContextLoader.initWebApplicationContext（ContextLoader.java:291） 在org.springframework.web.context.ContextLoaderListener.contextInitialized（ContextLoaderListener.java:103） 在org.apache.catalina.core.StandardContext.listenerStart（StandardContext.java:4939） 在org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5434） 在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150） 在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1559） 在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1549） 在java.util.concurrent.FutureTask.run（FutureTask.java:266） 在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149） 在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624） 在java.lang.Thread.run（Thread.java:748） 原因：java.lang.IllegalStateException：必须以Java代理开头才能使用InstrumentationLoadTimeWeaver。参见Spring文档。 在org.springframework.util.Assert.state（Assert.java:73） 在org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver.addTransformer（InstrumentationLoadTimeWeaver.java:89）处 在org.springframework.orm.jpa.persistenceunit.SpringPersistenceUnitInfo.addTransformer（SpringPersistenceUnitInfo.java:85）处 在org.hibernate.jpa.boot.internal.PersistenceUnitInfoDescriptor.pushClassTransformer（PersistenceUnitInfoDescriptor.java:113） 在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl。（EntityManagerFactoryBuilderImpl.java:251） 在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl。（EntityManagerFactoryBuilderImpl.java:164） 在org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory（SpringHibernateJpaPersistenceProvider.java:51）
答案 0 :(得分：1)
最终延迟加载适用于以下配置
var result = [{
"id": 1,
"pid": 0,
"name": "a",
"select": 0,
"child": [{
"id": 7,
"pid": 1,
"name": "a-1",
"select": 1,
"child": [{
"id": 8,
"pid": 7,
"name": "a-1-2",
"select": 1
},
{
"id": 9,
"pid": 7,
"name": "a-2-2",
"select": 1
}
]
}]
},
{
"id": 2,
"pid": 0,
"name": "b",
"select": 0,
"child": [{
"id": 10,
"pid": 2,
"name": "b-1",
"select": 0,
"child": [{
"id": 11,
"pid": 10,
"name": "b-1-1",
"select": 1
},
{
"id": 12,
"pid": 10,
"name": "b-1-2",
"select": 1
}
]
}]
},
{
"id": 3,
"pid": 0,
"name": "c",
"select": 0,
"child": [{
"id": 13,
"pid": 3,
"name": "c-1",
"select": 1,
"child": [{
"id": 14,
"pid": 13,
"name": "c-1-1",
"select": 0
},
{
"id": 15,
"pid": 13,
"name": "c-1-2",
"select": 1
}
]
}]
}
]
var selected = []
for (let i = 0; i < result.length; i++) {
const a1 = result[i].child
for (let j = 0; j < a1.length; j++) {
console.log(a1[j].name)
const a2 = a1[j].child
for (let k = 0; k < a2.length; k++) {
if (a1[j].id === a2[k].pid) {
if (a2[k].select === 1) {
console.log(a1[j].id)
console.log(a2[k].name)
console.log('yyyyyyyy', a2[k].id)
}
}
}
}
}
console.log(result)