How to use

assertPosition

method

in

org.postgresql.jdbc3.AbstractJdbc3Blob

/**
 * Writes all or part of the given <code>byte</code> array to the
 * <code>BLOB</code> value that this <code>Blob</code> object represents
 * and returns the number of bytes written.
 * Writing starts at position <code>pos</code> in the <code>BLOB</code>
 * value; <code>len</code> bytes from the given byte array are written.
 *
 * @param pos the position in the <code>BLOB</code> object at which
 *    to start writing
 * @param bytes the array of bytes to be written to this <code>BLOB</code>
 *    object
 * @param offset the offset into the array <code>bytes</code> at which
 *    to start reading the bytes to be set
 * @param len the number of bytes to be written to the <code>BLOB</code>
 *    value from the array of bytes <code>bytes</code>
 * @return the number of bytes written
 * @exception SQLException if there is an error accessing the
 *     <code>BLOB</code> value
 * @see #getBytes
 * @since 1.4
 */
public synchronized int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException
{
  assertPosition(pos);
  lo.seek((int) (pos-1));
  lo.write(bytes, offset, len);
  return len;
}

/**
 * Writes all or part of the given <code>byte</code> array to the
 * <code>BLOB</code> value that this <code>Blob</code> object represents
 * and returns the number of bytes written.
 * Writing starts at position <code>pos</code> in the <code>BLOB</code>
 * value; <code>len</code> bytes from the given byte array are written.
 *
 * @param pos the position in the <code>BLOB</code> object at which
 *    to start writing
 * @param bytes the array of bytes to be written to this <code>BLOB</code>
 *    object
 * @param offset the offset into the array <code>bytes</code> at which
 *    to start reading the bytes to be set
 * @param len the number of bytes to be written to the <code>BLOB</code>
 *    value from the array of bytes <code>bytes</code>
 * @return the number of bytes written
 * @exception SQLException if there is an error accessing the
 *     <code>BLOB</code> value
 * @see #getBytes
 * @since 1.4
 */
public synchronized int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException
{
  assertPosition(pos);
  lo.seek((int) (pos-1));
  lo.write(bytes, offset, len);
  return len;
}

/**
 * Writes all or part of the given <code>byte</code> array to the
 * <code>BLOB</code> value that this <code>Blob</code> object represents
 * and returns the number of bytes written.
 * Writing starts at position <code>pos</code> in the <code>BLOB</code>
 * value; <code>len</code> bytes from the given byte array are written.
 *
 * @param pos the position in the <code>BLOB</code> object at which
 *    to start writing
 * @param bytes the array of bytes to be written to this <code>BLOB</code>
 *    object
 * @param offset the offset into the array <code>bytes</code> at which
 *    to start reading the bytes to be set
 * @param len the number of bytes to be written to the <code>BLOB</code>
 *    value from the array of bytes <code>bytes</code>
 * @return the number of bytes written
 * @exception SQLException if there is an error accessing the
 *     <code>BLOB</code> value
 * @see #getBytes
 * @since 1.4
 */
public synchronized int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException
{
  assertPosition(pos);
  lo.seek((int) (pos-1));
  lo.write(bytes, offset, len);
  return len;
}