This week's book giveaway is in the Design forum.
We're giving away four copies of Building Microservices and have Sam Newman on-line!
See this thread for details.
The moose likes JDBC and Relational Databases and the fly likes convert String a Blob Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Building Microservices this week in the Design forum!
JavaRanch » Java Forums » Databases » JDBC and Relational Databases
Bookmark "convert String a Blob" Watch "convert String a Blob" New topic

convert String a Blob

Jhonnathan Emilio Cardona Saineda
Ranch Hand

Joined: Jan 24, 2012
Posts: 38

hello, thanks in advance.
In the Oracle database, I have a blob type data.
How I can store a String with PreparedStatement using the method setBlob()?
i used this but don't work

byte byte_string[]=string.getBytes();
Blob blob= new SerialBlob(byte_string);
preparedStatement.setBlob(1, blob);

java.lang.ClassCastException: javax.sql.rowset.serial.SerialBlob cannot be cast to oracle.sql.BLOB

Thank you.

Sorry for my English, I'll improve
Martin Vajsar

Joined: Aug 22, 2010
Posts: 3718

Well, the first problem is that String contains character data, while BLOB contains binary data. Are you sure you shouldn't be using a CLOB, which is designed to hold characters? You're currently going around this issue by converting the String to bytes, but it entails character set conversion to your default locale and it might not be what you need.

Oracle won't accept a Blob or Clob created using the new operator. This thread contains a code that can be used to store a BLOB or CLOB in Oracle, and references to two other threads.
Have you checked out Aspose?
subject: convert String a Blob
It's not a secret anymore!