在过程触发器内部动态插入记录 [英] Insert record dynamically inside of Procedural Trigger

问题描述

我们希望将我们的数据库转换为我没有经验的Postgres（9.3.5），并且我正在尝试启动并运行我们的审计表。我知道每个表都需要自己的触发器，但是所有触发器都可以调用一个函数。

We are looking to convert our database over to Postgres (9.3.5), which I have no experience with, and I am trying to get our audit tables up and running. I understand that each table will need its own trigger, but all triggers can call a single function.

表上的触发器正在传递需要

The trigger on the table is passing a list of the columns that need to be audited since some of our columns are not tracked.

以下是我关注的一些帖子：

-https://stackoverflow.com/a/7915100/229897

- http://www.postgresql.org/docs/9.3/static/plpgsql-statements.html

- http://www.postgresql.org/docs /9.4/static/plpgsql-trigger.html

Here are some of the posts I followed:
- https://stackoverflow.com/a/7915100/229897
- http://www.postgresql.org/docs/9.3/static/plpgsql-statements.html
- http://www.postgresql.org/docs/9.4/static/plpgsql-trigger.html

当我运行此程序时，我收到错误消息：ERROR： $ 1或附近的语法错误

When I run this I get the error: ERROR: syntax error at or near "$1"

DROP TABLE IF EXISTS people;
DROP TABLE IF EXISTS a_people;

CREATE TABLE IF NOT EXISTS people (
  record_id  SERIAL PRIMARY KEY NOT NULL,
  first_name VARCHAR NOT NULL,
  last_name VARCHAR NOT NULL,
  last_updated_on TIMESTAMP NOT NULL DEFAULT  CURRENT_TIMESTAMP 
);

CREATE TABLE IF NOT EXISTS a_people (
  record_id  SERIAL PRIMARY KEY NOT NULL,
  a_record_id INT,
  first_name VARCHAR NULL,
  last_name VARCHAR NULL,
  last_updated_on TIMESTAMP
);
/******************************************************/
--the function
CREATE OR REPLACE FUNCTION audit_func()
RETURNS TRIGGER AS 
$BODY$  
    DECLARE 
        audit   TEXT := TG_TABLE_SCHEMA || '.a_' || TG_TABLE_NAME;
        cols    TEXT := TG_ARGV[0];
    BEGIN
        EXECUTE format('INSERT INTO %1$s(a_%2$s) SELECT %2$s FROM ($1)',  audit, cols) USING OLD;   
        NEW.last_updated_on = CURRENT_TIMESTAMP;
        RETURN NEW;
    END;
$BODY$
LANGUAGE plpgsql;
/******************************************************/
--the trigger calling the function to update inbound records
CREATE TRIGGER build_user_full_name_trg 
BEFORE UPDATE
ON people 
FOR EACH ROW WHEN (OLD.* IS DISTINCT FROM NEW.*)
EXECUTE PROCEDURE audit_func('record_id,first_name,last_name');
/******************************************************/
INSERT INTO people (first_name, last_name) VALUES ('George','Lincoln');
UPDATE people SET last_name = 'Washington' WHERE first_name = 'George';
SELECT * FROM people;

我欢迎您的帮助（和耐心等待）！

I welcome your assistance (and patience)!

推荐答案

此子选择应该起作用：

EXECUTE format('INSERT INTO %1$s(a_%2$s) SELECT %2$s FROM (select ($1).*) XX',  audit, cols) USING OLD;   

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