java - JPA自定义JDBC批量大小不起作用

Question

我尝试按照 @Vlad Mihalcea 博客中所述配置 JDBC 批处理大小 https://vladmihalcea.com/how-to-customize-the-jdbc-batch-size-for-each-persistence-context-with-hibernate/

EntityManager entityManager =  entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
entityManager.unwrap(Session.class).setJdbcBatchSize(5);
        for(int i = 0;i<10;i++){
            Charge c = new Charge();
            c.setAccountNumber("acct"+i);
            entityManager.persist(c);
        }
entityManager.getTransaction().commit();



<bean id="entityManagerFactoryDefault" 
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="charg" />
        <property name="persistenceUnitName" value="MaterializedView" />
        <property name="persistenceXmlLocation" value="classpath*:META-INF/jpa-persistence.xml" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="generateDdl" value="false" />
                <property name="showSql" value="true"/> 
                <property name="database">
                    <util:constant static-field="org.springframework.orm.jpa.vendor.Database.ORACLE" />
                </property>
            </bean>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.default_batch_fetch_size">500</prop>
                <prop key="hibernate.jdbc.fetch_size">10</prop>
                <prop key="hibernate.jdbc.batch_versioned_data">true</prop>
                <prop key="hibernate.order_updates">true</prop>
                <prop key="hibernate.order_inserts">true</prop>
                <prop key="hibernate.jdbc.batch_size">30</prop>
                <prop key="hibernate.id.new_generator_mappings">false</prop>
            </props>
        </property>

    </bean>

但它触发了 10 个插入查询。

我收到这个询问 hibernate :从 Dual 选择 charge.nextvalHibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入CHARGE(ACCOUNTNUMBER CHARGE_ID)值(？，？)Hibernate:插入 CHARGE (ACCOUNTNUMBER CHARGE_ID) 值 (?, ?)

我正在使用 hibernate 5.2.10.Final 版本和序列作为策略。如果我的代码有问题，有人可以纠正我

Answer 1

Hibernate 日志记录机制可能在这里误导了您。使用默认的 Hibernate 日志记录很难看到 JDBC 批处理工作。

如果切换到datasource-proxy ，然后您可以看到批处理工作:

Name:DATA_SOURCE_PROXY, Time:6, Success:True,
Type:Prepared, Batch:True, QuerySize:1, BatchSize:3,
Query:["insert into post (title, version, id) values (?, ?, ?)"],
Params:[(Post no. 0, 0, 0), (Post no. 1, 0, 1), (Post no. 2, 0, 2)]

Batch:True 参数显示 JDBC 捕获正在工作，BatchSize:3 显示您有一组在一次数据库往返中发送的参数值。