Postgres規則，以幫助CSV導入

我需要每天導入一個具有數千行數十行的csv文件到Postgres數據庫。我正在研究最有效的方法，因爲csv文件中的每一行都可以是新記錄，或者是現有的記錄，如果它在那裏就應該更新。許多搜索後，我偶然發現了一個解決方案，我用：Postgres規則，以幫助CSV導入

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;

這是我來工作的解決方案最接近的，但它是不完整的。它未能在插入看起來像這樣：

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);

的錯誤信息是：

duplicate key value violates unique constraint "unique_phrase_campaign_combo"

unique_phrase_campaign_combo樣子：除非爲已刪除的記錄標記

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

deleted_at爲空。

任何人都知道我可以如何解決這個問題？

謝謝

來源

2010-09-20 aeldaly

順便說一句 - 在MySQL中，你可以使用所提供的答案在這裏：http://stackoverflow.com/questions/1361340/how-to-insert-if-not-exists-in-mysql – warren 2011-02-17 12:49:20

沃倫：MySQL有插入忽略，並且postgres不 – monksy 2011-02-19 03:46:53

要做到這一點，最好的方法是添加一個臨時表。使用副本填充登臺表。然後用它來做你的插入和更新。

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 
)

來源

2010-09-20 03:33:57

Postgres規則，以幫助CSV導入

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