Hibernate 4.2.2从未知长度的输入流创建blob [英] Hibernate 4.2.2 create blob from unknown-length input stream
问题描述
您好,我想从输入流创建一个hibernate blob,但我不知道流的长度。
Hibernate.getLobCreator(sessionFactory.getCurrentSession())。createBlob(stream,length)
我在不知道流的长度的情况下创建了一个blob?
EDIT1
在更旧的hibernate版本中,
http://viralpatel.net/blogs/tutorial-save-get-blob-object-spring-3-mvc-hibernate/
Blob blob = Hibernate.createBlob(file.getInputStream());
EDIT2
好的但它有一个错误的实现
返回新的SerializableBlob(新的BlobImpl(stream,stream.available()));
stream.available不是真正的大小
编辑3
我试过了
session.doWork(new Work(){
@Override
public void execute(Connection conn)throws SQLException {
LargeObjectManager lobj =((org.postgresql.PGConnection)conn ).getLargeObjectAPI();
但conn只是c3p0的一个NewProxyConnection。
以下是我现在使用的内容
会话currentSession = getSessionFactory()。getCurrentSession();
Blob blob = Hibernate.getLobCreator(currentSession).createBlob(new byte [0]);
OutputStream setBinaryStream = blob.setBinaryStream(1);
Utils.fastChannelCopy(input,setBinaryStream);
setBinaryStream.close();
Hi i want to create a blob in hibernate from an inputstream, but i don't know the length of the stream.
Hibernate.getLobCreator(sessionFactory.getCurrentSession()).createBlob(stream, length)
how can i crate a blob without knowing the length of the stream?
EDIT1
in older hibernate versions it was possible
http://viralpatel.net/blogs/tutorial-save-get-blob-object-spring-3-mvc-hibernate/
Blob blob = Hibernate.createBlob(file.getInputStream());
EDIT2
ok but it had an buggy implementation
return new SerializableBlob( new BlobImpl( stream, stream.available() ) );
stream.available isn't the real size
EDIT 3
i tried
session.doWork(new Work() {
@Override
public void execute(Connection conn) throws SQLException {
LargeObjectManager lobj = ((org.postgresql.PGConnection) conn).getLargeObjectAPI();
but conn is just a NewProxyConnection from c3p0.
Here is what i'm using now
Session currentSession = getSessionFactory().getCurrentSession();
Blob blob = Hibernate.getLobCreator(currentSession).createBlob(new byte[0]);
OutputStream setBinaryStream = blob.setBinaryStream(1);
Utils.fastChannelCopy(input, setBinaryStream);
setBinaryStream.close();
这篇关于Hibernate 4.2.2从未知长度的输入流创建blob的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!