code: public void checkSQLColumnSize(final Attribute _attribute,
                                     final int _size)
          throws SQLException
      {
          if ((_attribute.getSqlColNames() == null) || _attribute.getSqlColNames().isEmpty())  {
              throw new SQLException("no SQL column for attribute defined");
          }
          if (_attribute.getSqlColNames().size() > _size)  {
              throw new SQLException("more than " + _size + " SQL columns defined (is "
                      + _attribute.getSqlColNames().size() + ")");
          }
      }
docs: Checks for expected <code>_size</code> of SQL columns for
  <code>_attribute</code>.
  
  @param _attribute    attribute to check
  @param _size         expected size of SQL columns
  @throws SQLException if the size of the SQL columns in
  <code>_attribute</code> is not the expected
  <code>_size</code>