code: public ZealotKhala lessThan(String field, Object value) {
          return this.doNormal(ZealotConst.ONE_SPACE, field, value, ZealotConst.LT_SUFFIX, true);
      }
docs: 生成小于查询的SQL片段.
  @param field 数据库字段
  @param value 值
  @return ZealotKhala实例