JPA自定义JDBC批处理大小不起作用

Question

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>

我得到以下查询：hibernate：select CHARGE.nextval from dual hibernate：insert into CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）Hibernate：插入到CHARGE(ACCOUNTNUMBER CHARGE_ID)值（？,？）

我使用Hibernate5.2.10.最终版本和序列作为策略。如果我的代码有错误，有人能纠正我吗

Answer 1

Hibernate日志机制可能误导了您。很难看到JDBC批处理使用默认的Hibernate日志进行工作。

如果切换到datasource-proxy，则可以看到批处理正在工作：

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:3参数显示在一个数据库往返中发送了一组参数值。