Problem writing a BLOB

Question

Hi,
- I have some problems to write a file in a BLOB field of an Oracle 9i database.
I don't want to use oracle.sql.BLOB class because I want my application to accept all kinds of database, so I want to use java.sql.Blob class.
1/ First I create a record in the database with an empty value for the BLOB field
2/ Then I retrieve the record just created
3/ I want to write in the BLOB field
There is the code for the third part, which occurs an exception :
java.sql.Blob myBlob = (java.sql.Blob) rs.getBlob(1);
File f = new File("c:\\myFile.txt");
FileInputStream fis = new FileInputStream(f);
OutputStream os = myBlob.setBinaryStream(0);
int length=-1;     
while((length=fis.read())!=-1) {     
   os.write(length);
}The exception occurs on the line : "OutputStream os = myBlob.setBinaryStream(0);"
There is the exception :
java.sql.SQLException: Fonction non prise en charge
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
at oracle.jdbc.dbaccess.DBError.throwUnsupportedFeatureSqlException(DBError.java:689)
at oracle.sql.BLOB.setBinaryStream(BLOB.java:1007)
Any idea ?
- another question I have.
When I retrieve my Blob from the database, I'm using the getBinaryStream() of the Blob class. This method returns always an OracleBlobInputStream, is there any way to retrieve a "standard" java object, and not a specific oracle object ?
Thanks in advance for your help,
Steve

Answer 1

Hello,
i would not get the OutputStream by calling the Method "OutputStream os = myBlob.setBinaryStream(0);".
I use the Method "blobDest.getBinaryOutputStream();"
Unfortunately, it's not possible to use the abstract JDBC driver interface to set a BLOB (unlimited size) into a oracle database, or rather i don't how to do it...
Here is the code which i use to insert a inputstream to a blob. Please note: In this example a string-type is used for the ID. This might be adapted in your solution....
public static void setBlob(Connection connection, InputStream inputStream, String tableName,
String columnName, String recordID) throws SQLException, IOException
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("SELECT ID, "+columnName+" FROM "+tableName+" WHERE ID='"+recordID+"' FOR UPDATE");
resultSet.next();
oracle.sql.BLOB blobDest = (oracle.sql.BLOB) ((OracleResultSet) resultSet).getBlob(2);
byte[] buffer = new byte[ blobDest.getBufferSize() ];
OutputStream outputStream = blobDest.getBinaryOutputStream();
int length = -1;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer,0,length);
outputStream.flush();
statement.close();
outputStream.close();
inputStream.close();
resultSet.close();
Hope it's help
best regards
sschoenig