我在Oracle 11G(11.1)中有一个表，它有一个包含XML文档的BLOB列。

XML文档已使用Java程序写入表中，并已使用java.util.zip平减器进行序列化和压缩。

有没有简单的方法使用SQL或PLSQL来提取此文档以反转创建BLOB列以取回原始XML文档的过程？

我从Web应用程序中识别出一段Java，它读取类似于下面代码的列，但出于支持目的，希望能够从后端访问列数据。

private IntegrationStagingDataBean fromObjectToBean(StagedMessage message) throws ServerException {

IntegrationStagingDataBean bean = new IntegrationStagingDataBean();

bean.setBusinessId(message.getBusinessId());

bean.setBusinessType(message.getBusinessType());

bean.setCreateTime(message.getCreateTime());

bean.setDeleted(message.hasBeenDeleted() ? "Y" : "N");

bean.setErrorMessage(message.getErrorMessage());

bean.setId(message.getId());

bean.setStoreId(message.getStoreId());

bean.setMessageDirection(message.getMessageDirection().getDbCode());

bean.setMessageFamily(message.getMessageFamily().getDbCode());

bean.setMessageType(message.getMessageType().getDbCode());

bean.setProcessed(message.hasBeenProcessed() ? "Y" : "N");

bean.setRetryCount(message.getRetryCount());

bean.setUpdateTime(message.getUpdateTime());

try {

bean.setSerializedDeo(ObjectUtils.toByteArray(new CompressedObject(message.getDeo())));

} catch (IOException ioex) {

throw new ServerException("Problem setting compressed serialized object", ioex);

}

return bean;

}

private StagedMessage fromBeanToObject(IntegrationStagingDataBean bean) throws ServerException {

DataExchangeObject deo = null;

Blob blob = (Blob) bean.getSerializedDeo();

try {

CompressedObject compressedObject = (CompressedObject) new

ObjectInputStream(blob.getBinaryStream()).readObject();

deo = (DataExchangeObject) compressedObject.recoverObject();

} catch (Exception e) {

throw new ServerException("Couldn't uncompress/deserialize DEO from BLOB", e);

}++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++

并发现以下附加功能遍布于少数几个软件包中，这些软件包指示它使用java.util.zip。*中的java函数deflater;

公共CompressedObject(Object对象)

抛出IOException

{

dataToSend = null;

如果(object！= null)

dataToSend = ObjectUtils.toCompressedByteArray(object);

}

public static final byte[] toCompressedByteArray(Object o)

throws IOException

{

return compressByteArray(toByteArray(o));

}

public static final byte[] compressByteArray(byte input[])

{

Deflater compressor = new Deflater(9);

compressor.setInput(input);

compressor.finish();

ByteArrayOutputStream bos = new ByteArrayOutputStream(input.length);

byte buf[] = new byte[1024];

int count;

for(; !compressor.finished(); bos.write(buf, 0, count))

count = compressor.deflate(buf);

try

{

bos.close();

}

catch(IOException e) { }

return bos.toByteArray();

}

public static final byte[] decompressByteArray(byte arr[])

{

Inflater decompressor = new Inflater();

decompressor.setInput(arr);

ByteArrayOutputStream bos = new ByteArrayOutputStream(arr.length);

byte buf[] = new byte[1024];

while(!decompressor.finished())

try

{

int count = decompressor.inflate(buf);

bos.write(buf, 0, count);

}

catch(DataFormatException e) { }

try

{

bos.close();

}

catch(IOException e) { }

return bos.toByteArray();

}提前致谢。