JDBC + Hibernate writes Blob data to Oracle

The Blob field in Oracle is special. It has much better performance than the long field and can be used to save binary data such as sample slices.
Writing Blob fields is very different from writing other types of fields. Because Blob itself has a cursor, you must use cursor to operate blob. Therefore, before writing Blob, you must obtain the cursor to write data. How can you obtain the Blob cursor?
This requires you to insert an empty blob first, which will create a blob cursor, and then you can query the cursor of the empty blob using select. In this way, you can perform two steps, you can get the blob cursor to write blob data.
Take a look at the following JDBC demo and write the binary file oraclejdbc. jar to the content field of the javatest database table (this is a blob field)
Import java. SQL .*;
Import java. io .*;
Import oracle. SQL .*;
Public class WriteBlob {
Public static void main (String [] args ){
Try {
DriverManager. registerDriver (new oracle. jdbc. driver. OracleDriver ());
Connection conn = DriverManager. getConnection ("jdbc: oracle: thin: @ localhost: 1521: orcl", "fankai", "fankai ");
Conn. setAutoCommit (false );
BLOB blob = null;
PreparedStatement pstmt = conn. prepareStatement ("insert into javatest (name, content) values (?, Empty_blob ())");
Pstmt. setString (1, "fankai ");
Pstmt.exe cuteUpdate ();
Pstmt. close ();
Pstmt = conn. prepareStatement ("select content from javatest where name =? For update ");
Pstmt. setString (1, "fankai ");
ResultSet rset = pstmt.exe cuteQuery ();
If (rset. next () blob = (BLOB) rset. getBlob (1 );
String fileName = "oraclejdbc. jar ";
File f = new File (fileName );
FileInputStream fin = new FileInputStream (f );
System. out. println ("file size =" + fin. available ());
Pstmt = conn. prepareStatement ("update javatest set content =? Where name =? ");
OutputStream out = blob. getBinaryOutputStream ();
Int count =-1, total = 0;
Byte [] data = new byte [(int) fin. available ()];
Fin. read (data );