在 insert/update 上触发不更新 tsvector

Question

我正在尝试从几个表中的几个列中提取数据以使其可全文搜索，但我的运气不佳。

这是我的函数：

CREATE OR REPLACE FUNCTION on_customer_save_udpate_tsv() RETURNS trigger AS $$ 
declare 
   tsv_text text; 
begin 
SELECT string_agg(cust_text.text, ' ') as agg_text into tsv_text 
FROM (SELECT concat("name", ' ', "phone") as text 
   FROM "Customers" 
   where "id" = NEW.id 
   UNION 
   SELECT concat("firstName", ' ', "lastName", ' ', "phone", ' ', "email") as text 
   FROM "Contacts" 
   where "customerId" = NEW.id 
   UNION 
   SELECT concat("streetLine1", ' ', "city", ' ', "state", ' ', "zip") as text 
   FROM "Addresses" 
   where "customerId" = NEW.id) cust_text; 
NEW.tsv := to_tsvector(coalesce(tsv_text,'')); 
return NEW; 
end 
$$ LANGUAGE plpgsql;

这是我的触发器：

CREATE TRIGGER cust_tsv_trigger BEFORE INSERT OR UPDATE 
ON "Customers" FOR EACH ROW EXECUTE PROCEDURE on_customer_save_udpate_tsv();

但是，"Customers".tsv 列在 inserts/updates.

之后是空白的

当我手动运行大部分功能时，它按预期工作。

DO $$ 
declare 
   tsv_text text; 
begin 
SELECT string_agg(cust_text.text, ' ') as agg_text into tsv_text 
FROM (SELECT concat("name", ' ', "phone") as text 
   FROM "Customers" 
   where "id" = 17 
   UNION 
   SELECT concat("firstName", ' ', "lastName", ' ', "phone", ' ', "email") as text 
   FROM "Contacts" 
   where "customerId" = 17
   UNION 
   SELECT concat("streetLine1", ' ', "city", ' ', "state", ' ', "zip") as text 
   FROM "Addresses" 
   where "customerId" = 17) cust_text; 

   UPDATE "Customers"
   SET tsv = to_tsvector(coalesce(tsv_text, ''))
   WHERE "id" = 17;
end 
$$ LANGUAGE plpgsql;

我对 postgres 还很陌生。我错过了什么？

Answer 1

当触发器运行 BEFORE INSERT 或 UPDATE 时，从 table select 获取新值是有缺陷的，因为新值还没有。

考虑这部分查询：

SELECT concat("name", ' ', "phone") as text 
   FROM "Customers" 
   where "id" = NEW.id

对于 INSERT，您将始终在此处获得 NULL，而对于 UPDATE，您将获得即将被替换的值，而不是新值。

上面代码的替代品应该是：

SELECT (NEW.name || ' ' || NEW.phone) AS text

另一点看起来可疑的是：如果 3 table 中任何一个的用户详细信息中的任何字段为 NULL，则整个连接的内容将为空，因为代码适用coalesce 在最后而不是在每个单独的字段上进行。

在 insert/update 上触发不更新 tsvector

Trigger not updating tsvector on insert/update

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triggers

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