/**
* Returns a substring.
*
* @param pos the position (the first character is at position 1)
* @param length the number of characters
* @return the string
*/
public String getSubString(long pos, int length) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("getSubString(" + pos + ", " + length + ");");
}
checkClosed();
if (pos < 1) {
throw DbException.getInvalidValueException("pos", pos);
}
if (length < 0) {
throw DbException.getInvalidValueException("length", length);
}
StringWriter writer = new StringWriter(Math.min(Constants.IO_BUFFER_SIZE, length));
Reader reader = value.getReader();
try {
IOUtils.skipFully(reader, pos - 1);
IOUtils.copyAndCloseInput(reader, writer, length);
} finally {
reader.close();
}
return writer.toString();
} catch (Exception e) {
throw logAndConvert(e);
}
}
