Hibernate map Clob blob field

In many cases, storing large strings or binary data such as pictures hibernate also provides support for BLOBs and CLOB types

BLOB storage is suitable for storing binary data, such as image file Clob using multibyte storage suitable for saving large text, etc.

In MSSQL, image and ntext respectively correspond to blobs and CLOB.

Table mapping file for two types of writing

The mapping type for BLOB format is type= "Java.sql.Clob";

No difference in how the bean is written. Generate getter and setter directly

Save the binary content of a picture

User user=new User();
FileInputStream image=new FileInputStream("image.jpg");
Blob img=Hibernate.createBlob(image);
user.setImage(img);
Clob desc=Hibernate.createClob("abcd");
user.setDesc(desc);
save(user);

Save blob and CLOB type complete

Read:

Reading BLOB type binary data

Blog Img=user.getimage ();

InputStream Inputs=img.getbinarystream ();//Get binary stream

Write to File

FileOutStream fos=new FileOutStream("tempimg.jpg");
byte [] buffer=new byte[102400];
int len;
while((len=inputs.read(buffer))!=-1)
{
fos.write(buffer,0,len);
}
fos.close;
inputs.close;

Oracle execution will receive the following error

streams type cannot be userd in batching

Orcale JDBC does not allow streaming operations to be done in batches (Oracle BLOBs use streaming as data read and write)

user.setImage(Hibernate.createBlob(new byte[1]));
user.setDesc(Hibernate.careteClob(" "));
session.save(user);
session.flush();
session.refresh(user,LockMode.UPGRADE);

To the inside blob to write the actual content ditto

Write to Clob

oracle.sql.Clob clob=user.getDesc();
Writer writer=clob.getCharacterOutputStream();
writer.write("abcd");
session.save(user);