Question

我有以下Hibernate配置：

<prop key="hibernate.connection.driver_class">com.mysql.jdbc.Driver</prop>
<prop key="hibernate.connection.url">jdbc:mysql://localhost:3336/db</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.jdbc.batch_size">20</prop>

和以下映射文件：

<hibernate-mapping default-lazy="false">
    <class name="Table" table="TABLE" batch-size="10" dynamic-update="true">
        <id name="id" column="ID">
            <generator class="uuid"/>
        </id>
        <property name="name" column="NAME" not-null="true"/>
    </class>
</hibernate-mapping>

如果执行此操作，它可以正常工作：

sessionFactory.getSession().beginTransaction();
    sessionFactory.getSession().save(new Table());
    sessionFactory.getSession().save(new Table());
    sessionFactory.getSession().save(new Table());
    sessionFactory.getSession().save(new Table());
sessionFactory.getSession().getTransaction().commit();

但是，将rewriteBatchedStatements=true添加到hibernate.connection.url：

<prop key="hibernate.connection.url">jdbc:mysql://localhost:3336/db?rewriteBatchedStatements=true</prop>

在提交时抛出以下异常：

org.hibernate.jdbc.BatchedTooManyRowsAffectedException: Batch update returned unexpected row count from update [0]; actual row count: 4; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:95)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:70)
    at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:90)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)

任何想法有什么不对？

Answer 1

我使用的是具有此错误的MySQL Connector / J 5.1.28： http://bugs.mysql.com/bug.php?id=68562。降级到5.1.24解决了这个问题。

Answer 2

我也遇到了这个问题，并通过将mysql连接器更新到5.1.36来修复它：

     <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.36</version>
    </dependency>

Hibernate + MySQL + rewriteBatchedStatements = true

2 个答案: