休眠 - 内存不足插入大 blob

Question

在 POJO 我有：

public void setBlob(InputStream in, Long l) {
        this.blob = Hibernate.getLobCreator(SessionFactoryHelper.sessionFactory.getCurrentSession()).createBlob(in, l);
}

我在配置中将 hibernate.jdbc.use_streams_for_binary 设为 true，但它真的改变了什么吗？

保存实体时，在 session.flush() 上我得到：

   org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release
INFO: HHH000010: On release of batch it still contained JDBC statements
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
Heap dump file created [46180174 bytes in 1.662 secs]
    at java.util.Arrays.copyOf(Arrays.java:2271)
    at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:113)
    at java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.java:93)
    at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:140)
    at org.hibernate.type.descriptor.java.DataHelper.extractBytes(DataHelper.java:171)
    at org.hibernate.type.descriptor.java.BlobTypeDescriptor.unwrap(BlobTypeDescriptor.java:121)
    at org.hibernate.type.descriptor.java.BlobTypeDescriptor.unwrap(BlobTypeDescriptor.java:45)
    at org.hibernate.type.descriptor.sql.BlobTypeDescriptor$4$1.doBind(BlobTypeDescriptor.java:105)
    at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:92)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:305)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:300)
    at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:57)
    at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2599)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2853)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3291)
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:88)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:354)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:275)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1127)

休眠 4.1。为什么休眠解包流到 bytea？我怎样才能让休眠使用准备好的语句 setBinaryStream？真的需要这方面的帮助。

Answer 1

我不知道为什么它不工作，但它应该工作，但我已经使用 Hibernate 将 blob 保存到数据库：

在映射到表的 POJO 中：

    private byte[] serializedDocx; // + getter and setter

在一个方法中：

    ...
     SessionFactory mf = ...
     sess = mf.openSession();
     //open connection
     sess.beginTransaction();
    ...
      ByteArrayOutputStream docxBos = new ByteArrayOutputStream();
      [write to docxBos]
      someEntity.setDocx(docxBos.toByteArray());
      sess.save(someEntity);

在 myEntity.hbm.xml 中

  <property name="serializedDocx" type="binary">
      <column name="serialized_docx" not-null="true"/>
    </property>

在 MySQL 中：

CREATE TABLE IF NOT EXISTS `docx` (
  `serialized_docx` longblob NOT NULL, ...

HTH。