Question

我需要一种方法来检查并将条目传递到审核日志中，以查找已更改的表中的任何条目。它需要从表结构中抽象出来。

例如：

CREATE TRIGGER table1_update 
BEFORE UPDATE ON table1 
FOR EACH ROW BEGIN
  DECLARE i_column_name varchar(32);
  DECLARE done INT;
  DECLARE cursor1 CURSOR FOR SELECT column_name FROM information_schema.columns WHERE table_name = 'table1';
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

  OPEN cursor1;
  REPEAT
    FETCH cursor1 INTO i_column_name;
    IF NOT done THEN

      --pass the variable column_name and its old.i_column_name and new.i_column_name values to the audit table

    END IF;
  UNTIL done END REPEAT;
  CLOSE cursor1;
END$$

我们有太多的表需要审核才能自定义构建每个INSERT，UPDATE和DELETE触发器。我尝试过很多东西，我觉得我运气不好。有人有什么想法吗？

Answer 1

您不能拥有抽象触发器，必须在特定表上定义它。最接近的是将触发器的代码放入存储过程，然后每个表的触发器只调用该过程。

CREATE PROCEDURE audit_update (IN tablename VARCHAR(64))
BEGIN
  DECLARE  i_column_name varchar(32);
  DECLARE done INT;
  DECLARE cursor1 CURSOR FOR SELECT column_name FROM information_schema.columns WHERE table_name = tablename;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

  OPEN cursor1;
  REPEAT
    FETCH cursor1 INTO i_column_name;
    IF NOT done THEN

      --pass the variable column_name and its old.i_column_name and new.i_column_name values to the audit table

    END IF;
  UNTIL done END REPEAT;
  CLOSE cursor1;
END


CREATE TRIGGER table1_update 
BEFORE UPDATE ON table1 
FOR EACH ROW BEGIN
  CALL audit_update('table1');
END

您应该能够使用information_schema或类似的东西轻松编写将为您的所有表创建触发器的内容。

SELECT CONCAT('CREATE TRIGGER ', table_name, '_update BEFORE UPDATE ON ', table_name, ...) FROM information_schema...

在MySQL 5.1中需要一个抽象触发器来更新审计日志

1 个答案: