/**
  * Sets the {@code byte} value of the given field.
  *
  * @param fieldName the field name.
  * @param value the value to insert.
  * @throws IllegalArgumentException if field name doesn't exists or isn't an integer field.
  */
 public void setByte(String fieldName, byte value) {
   long columnIndex = row.getColumnIndex(fieldName);
   row.setLong(columnIndex, value);
 }
 /**
  * Sets the {@code int} value of the given field.
  *
  * @param fieldName the field name to update.
  * @param value the value to insert.
  * @throws IllegalArgumentException if field name doesn't exists or isn't an integer field.
  */
 public void setInt(String fieldName, int value) {
   long columnIndex = row.getColumnIndex(fieldName);
   row.setLong(columnIndex, value);
 }