将字节数组转换为java.sql.Clob

Question

Is there any way to convert a byte array into java.sql.Clob ?

I am having this type of issue...

getHibernateTemplate().save(object)

Where object is having a field private Clob docData; and the similar is mapped into oracle table as CLOB

This docData clob is getting formed from somewhere in my java code like Hibernate.createClob(someString)

I tried to save it with type="clob" but getting cann't cast com.sun.proxy$Proxy124 to oracle.sql.CLOB . I have tried many ways to remove this Proxy but finally failed.

So I have decided to go like byte[] data = IOUtils.toByteArray(docData.getCharacterStream()); / byte[] data = IOUtils.toByteArray(docData.getAsciiStream()) and saving it as type="binary" but I am getting Caused by: java.sql.BatchUpdateException: ORA-01461: can bind a LONG value only for insert into a LONG column .

So now I want to create as a Clob from byte[].

Any help welcome.

Note earlier I was using Hibernate 3.3 and it was working fine without any such byte array conversion and etc...now I have upgraded to Hibernate 3.6.10 and getting this issue.

Answer 1

I'm using this method to create Blobs:

org.hibernate.engine.jdbc.NonContextualLobCreator.NonContextualLobCreator.INSTANCE.createBlob( buffer )

where buffer is an array of bytes.

There are 2 similar methods for creating CLOBs:

NonContextualLobCreator.INSTANCE.createClob( reader, length )
NonContextualLobCreator.INSTANCE.createClob( string )

Pick the one that fits better with your data.

Answer 2

Your error message says

cann't cast com.sun.proxy$Proxy124 to oracle.sql.CLOB

In the rest of your text you are referring to java.sql.Clob Check your imports, you might be using the clob from the oracle.sql package instead of the java.sql package somewhere.

Answer 3

Well, issue is resolved. I kept the java data type as 'Clob' only and made the hibernate mapping like type="string" . Issue got resolved since my digital sign data does not contain more than 2 MB (that java string max supports).