多表審計觸發功能

Question

我想保留我的表的所有更改。我有一個工作解決方案爲每個表格創建一個觸發器，但是複製foreach表格的代碼似乎很愚蠢。有沒有什麼辦法可以創建一個單獨的觸發函數來實現這個功能？我工作的每個表的觸發器的

例（包括表定義）：

CREATE TABLE departments (
    id     bigserial Primary Key, 
    name    varchar not null, 
    created    bigint not null default date_part('epoch', NOW()), 
    created_by   bigint references Employees (id) not null 
); 
create table Departments_hist ("action" varchar not null, change_date bigint not null, rev bigserial not null, like Departments); 
CREATE OR REPLACE FUNCTION add_to_history_Departments() RETURNS TRIGGER AS $$ 
BEGIN 
IF(TG_OP='INSERT' OR TG_OP='UPDATE') THEN 
    INSERT INTO Departments_hist values (TG_OP,date_part('epoch', NOW()),DEFAULT,NEW.*); 
END IF; 
IF (TG_OP='DELETE') THEN 
    INSERT INTO Departments_hist values (TG_OP,date_part('epoch', NOW()),DEFAULT,OLD.*); 
END IF; 
RETURN NEW; 
END; 
$$ LANGUAGE plpgsql; 
CREATE TRIGGER trigger_history_Departments AFTER INSERT OR UPDATE OR DELETE ON Departments FOR EACH ROW EXECUTE PROCEDURE add_to_history_Departments(); 

我試圖通過連接 '_hist' 以TG_TABLE_NAME讓它多表：

CREATE OR REPLACE FUNCTION add_to_hist_table() RETURNS TRIGGER AS $$ 
DECLARE 
    histTable text :=TG_TABLE_NAME || '_hist'; 
BEGIN 
    IF (TG_OP='INSERT' OR TG_OP='UPDATE') THEN 
     INSERT INTO histTable values (TG_OP,date_part('epoch', NOW()),DEFAULT,NEW.*); 
    ELSIF TG_OP='DELETE' THEN 
     INSERT INTO histTable values (TG_OP,date_part('epoch', NOW()),DEFAULT,OLD.*); 
    END IF; 
    RETURN null; --ignored since it is an AFTER triggger. 
END; 
$$ LANGUAGE plpgsql; 

但我得到一個錯誤：

ERROR: syntax error at or near "$1" 
LINE 1: INSERT INTO $1 values ($2 ,date_part('epoch', NOW()),DEFA... 
        ^
QUERY: INSERT INTO $1 values ($2 ,date_part('epoch', NOW()),DEFAULT, $3 .*) 
CONTEXT: SQL statement in PL/PgSQL function "add_to_hist_table" near line 5 

我想這是一個變量替換問題（http://www.postgresql.org/docs/8.4/static/plpgsql-implementation.html）。

該功能如何實現？

PS。我使用postgresql 8.4，但很快就可能升級到9.3。

Answer 1

我發現這個「相關的問題」 https://stackoverflow.com/a/1997417/844731

我沒想到做「執行使用」與新老的解決方案。所以現在一個工作解決方案是：

CREATE OR REPLACE FUNCTION add_to_hist_table() RETURNS TRIGGER AS $$ 
BEGIN 
IF (TG_OP='INSERT' OR TG_OP='UPDATE') THEN 
    execute 'INSERT INTO '|| TG_TABLE_NAME ||'_hist values (''' || TG_OP || ''',date_part(''epoch'', NOW()),DEFAULT,$1.*)' using NEW; 
ELSIF TG_OP='DELETE' THEN 
    execute 'INSERT INTO '|| TG_TABLE_NAME ||'_hist values (''' || TG_OP || ''',date_part(''epoch'', NOW()),DEFAULT,$1.*)' using OLD; 
END IF; 
RETURN null; --ignored since it is an AFTER triggger. 
END; 
$$ LANGUAGE plpgsql; 

Answer 2

@Pascal_dher，有人可以創建包含攻擊者代碼的名稱的表。由於Postgresql這可能dosnt做一些非常糟糕的，只有失敗的查詢。但是如果你的觸發器會更復雜，那麼影響可能會更糟糕。