Question

我需要每天将一个包含10行数的行的csv文件导入到Postgres数据库中。我正在寻找最有效的方法来做到这一点，因为csv文件中的每一行都可以是新记录，或者如果它存在则应该更新的现有记录。经过多次搜索，我偶然发现了一个解决方案，我用过：

CREATE OR REPLACE RULE insert_on_duplicate_update_advertiser_campaign_keywords_table AS
  ON INSERT TO advertiser_campaign_keywords
  WHERE (new.phrase, new.match_type, new.advertiser_campaign_id) IN (
    SELECT phrase, match_type, advertiser_campaign_id
    FROM advertiser_campaign_keywords
    WHERE phrase = new.phrase AND match_type = new.match_type AND advertiser_campaign_id = new.advertiser_campaign_id AND state != 'deleted')
DO INSTEAD
  UPDATE advertiser_campaign_keywords
  SET bid_price_cpc = new.bid_price_cpc
  WHERE phrase = new.phrase AND match_type = new.match_type AND advertiser_campaign_id = new.advertiser_campaign_id;

这是我最接近工作解决方案，但它并不完整。它看起来像这样的插入失败：

INSERT INTO advertiser_campaign_keywords (phrase, bid_price_cpc, match_type, advertiser_campaign_id) VALUES 
('dollar', 1::text::money, 'Broad', 1450),
('two words', 1.2::text::money, 'Broad', 1450),
('two words', 1.0::text::money, 'Broad', 1450),
('three words exact', 2.5::text::money, 'Exact', 1450),
('four words broad match', 1.1::text::money, 'Exclusive', 1450),
('three words exact', 2.1::text::money, 'Exact', 1450);

错误消息是：

duplicate key value violates unique constraint "unique_phrase_campaign_combo"

unique_phrase_campaign_combo看起来像：

CONSTRAINT "unique_phrase_campaign_combo" UNIQUE ("phrase", "advertiser_campaign_id", "match_type", "deleted_at")

除非将记录标记为已删除，否则

deleted_at为空。

任何人都知道如何解决这个问题？

由于

Answer 1

执行此操作的最佳方法是添加临时表。使用copy填充登台表。然后使用它来进行插入和更新。

UPDATE target_table t
  SET ...
FROM staging_table s
WHERE t.id = s.id

INSERT INTO target_table
SELECT * FROM staging_table s
WHERE s.id NOT EXISTS (
  SELECT id FROM target_table
)

Postgres规则帮助CSV导入

1 个答案: