如何将byte []保存为java.sql.Clob？

Question

I have a file that I get as a byte[] and I have to persist it in my entity as Clob.

How to save a byte[] as java.sql.Clob ?

Answer 1

To get a Clob from byte[] on Oracle, you can do

private Clob createClob(byte[] data, Connection conn) {
    CLOB clob = null; 

    try { 
        clob = CLOB.createTemporary(conn, false, oracle.sql.CLOB.DURATION_SESSION);

        clob.open(CLOB.MODE_READWRITE);

        OutputStream out = (OutputStream) clob.setAsciiStream(0L);

        out.write(data);
        out.flush();
        out.close();
    }
    catch (Exception e) {
        logger.error("", e);
    }
    finally {
        try {
            if (clob != null && clob.isOpen()) clob.close();
        }
        catch (SQLException e) {
            logger.error("Unable to close CLOB", e);
        }
    }

    return clob;
}

To create a Blob (binary) is almost the same, just replacing clob by blob and OutputStream out = (OutputStream) blob.setBinaryStream(0L);

Answer 2

With Apache commons-io

byte[] data = IOUtils.toByteArray(clob.getAsciiStream());

if you need special encoding or you have some issue try:

byte[] data = IOUtils.toByteArray(clob.getCharacterStream(), "UTF-8");

Answer 3

javax.sql.rowset.serial.SerialClob can accept array of char and create a serializable Clob object.

You can refer here http://docs.oracle.com/javase/7/docs/api/javax/sql/rowset/serial/SerialClob.html

javax.sql.rowset.serial.SerialBlob can accept array of bytes

You can refer here http://docs.oracle.com/javase/7/docs/api/javax/sql/rowset/serial/SerialBlob.html