JPA 自定義 JDBC 批處理大小不起作用

Question

我嘗試按照@Vlad Mihalcea 博客https://vladmihalcea.com/how-to-customize-the-jdbc-batch-size-for-each-persistence-context-with-hibernate/中所述配置 JDBC 批處理大小

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>

但它觸發了 10 個插入查詢。

我得到這個查詢 Hibernate: select charge.nextval from dual Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) values (?, ?) Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) values (?, ?) Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) ) 值 (?, ?) 休眠：插入 CHARGE (ACCOUNTNUMBER CHARGE_ID) 值 (?, ?) 休眠：插入 CHARGE (ACCOUNTNUMBER CHARGE_ID) 值 (?, ?) 休眠：插入 CHARGE (ACCOUNTNUMBER CHARGE_ID) 值 (?, ?) Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) values (?, ?) Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) values (?, ?) Hibernate: insert into CHARGE (ACCOUNTNUMBER CHARGE_ID) values (?, ?) Hibernate: insert CHARGE (ACCOUNTNUMBER CHARGE_ID) 值 (?, ?)

我使用 hibernate 5.2.10.Final 版本和序列作為策略。 如果我的代碼有問題，有人可以糾正我嗎

Answer 1

Hibernate 日志記錄機制可能在這里誤導了您。 很難看到 JDBC 批處理使用默認的 Hibernate 日志記錄工作。

如果您切換到datasource-proxy ，那么您可以看到批處理工作：

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參數顯示 JDBC 捕獲正在工作，而BatchSize:3顯示您有一組在一次數據庫往返中發送的參數值。