python同步数据遇到mysql常见问题

最近有一需求，要同步对方数据库数据到我们自己这边测试，mysql--> mysql的方式,但是对方数据库数据更新有几大特点

  1：表稍微小点的，每天直接干掉所有数据后重新插入数据
  2：大表会把某个时间段的数据全部干掉然后重新重新插入数据
  3：有的表字段不设置默认值

除了上面几个问题，实际业务中也存在一些数据类型的问题，最后只能在字段中做处理，处理办法如下面最终的sql

        SELECT
          IFNULL(penalty_id, 0) penalty_id,
          IFNULL(company_id, 0) company_id,
          IFNULL(org_company_id, 0) org_company_id,
          IFNULL(company_code, 0) company_code,
          IFNULL(company_name, 0) company_name,
          IFNULL(company_type, 0) company_type,
          IFNULL(company_industry, 0) company_industry,
          CAST(IFNULL(current_score, 0) AS CHAR(50)) AS current_score,
          CAST(
            IFNULL(deducting_score, 0) AS CHAR(50)
          ) AS deducting_score,
          DATE_FORMAT(
            IFNULL(
              deducting_timepoint,
              "1991-01-01 00:00:00"
            ),
            "%Y-%m-%d"
          ) deducting_timepoint,
          IFNULL(deducting_type, 0) deducting_type,
          IFNULL(deducting_content, 0) deducting_content,
          IFNULL(related_announcement, 0) related_announcement,
          IFNULL(related_announcement_url, 0) related_announcement_url,
          IFNULL(related_law_name, 0) related_law_name,
          IFNULL(related_law, 0) related_law,
          DATE_FORMAT(
            IFNULL(
              create_time,
              "1991-01-01 00:00:00"
            ),
            "%Y-%m-%d"
          ) create_time,
          DATE_FORMAT(
            IFNULL(
              update_time,
              "1991-01-01 00:00:00"
            ),
            "%Y-%m-%d"
          ) update_time,
          IFNULL(batch_no, 0) batch_no,
          IFNULL(audit_state, 0) audit_state,
          IFNULL(audit_state_desc, 0) audit_state_desc,
          DATE_FORMAT(
            IFNULL(
              audit_time,
              "1991-01-01 00:00:00"
            ),
            "%Y-%m-%d"
          ) audit_time,
          IFNULL(rule, 0) rule,
          IFNULL(note, 0) note,
          IFNULL(extend_1, 0) extend_1,
          IFNULL(extend_2, 0) extend_2,
          IFNULL(extend_3, 0) extend_3
        FROM
          cfcm_fortune_penalty_score
        WHERE TO_DAYS(NOW()) - TO_DAYS(update_time) = 0

没有采用binlog去同步数据是因为考虑到上面数据问题外,还存在其他一些问题，因为采用这种低效的方式