I am currently validating an application developed on Oracle for DB2. Since we don't want to maintain two separate sources, I need some query to insert blob into a field, that works in both oracle and db2. I don't have any identifier to distinguish under which DB the application is running.
I used utl_raw.cast_to_raw in oracle and CAST() as BLOB in DB2 which are mutually incompatible.
You won't be able to find a common SQL that uses some kind of casting. But you can do this with "plain" SQL using JDBC's setBinaryStream()
PreparedStatement pstmt = connection.prepareStatement(
"insert into blob_table (id, blob_data) values (?, ?)";
File blobFile = new File("your_document.pdf");
InputStream in = new FileInputStream(blobFile);
pstmt.setInt(1, 42);
pstmt.setBinaryStream(2, in, (int)blobFile.length());
pstmt.executeUpdate();
connection.commit();
You can use setBinaryStream() the same way with an UPDATE statement.
