public SelectSql column(String column, OrderByType order) {

        if (StringUtils.isEmpty(column) || order == null) {
            return this;
        }

        if (curOrderByColumnSize == 0) {
            sql.append(ORDER_BY);
        } else if (curOrderByColumnSize > 0) {
            sql.append(" , ");
        }
        sql.append(" ").append(column).append(" ").append(order);
        curOrderByColumnSize++;
        return this;
    }
@author Robert HG (254963746@qq.com) on 3/8/16.
lts-core/src/main/java/com/github/ltsopensource/store/jdbc/builder/SelectSql.java