code: @Override
      protected StringBuilder getAlterColumn(final String _columnName,
                                             final org.efaps.db.databases.AbstractDatabase.ColumnType _columnType)
      {
          final StringBuilder ret = new StringBuilder()
              .append(" alter ").append(getColumnQuote()).append(_columnName).append(getColumnQuote())
              .append(" type ")
              .append(getWriteSQLTypeName(_columnType));
          return ret;
      }
docs: {@inheritDoc}