title: Convert InputStream to base64 string
body: <p>There is a way to convert an <code>InputStream</code> to a <code>String</code>, and encode it to base64, right?</p>
  <p>In my function, I get <code>InputStream</code> parameter, and need to insert it into the BLOB field in my Oracle database table.</p>
  <p>Is there a way to do that?</p>
  <p>(My database object contains string field to save the image, but I don't find any way to convert the <code>InputStream</code> to string in base 64 format.)</p>