MySQL ON DUPLICATE KEY插入审计或日志表 [英] MySQL ON DUPLICATE KEY insert into an audit or log table

问题描述

有没有办法做到这一点?

Is there a way to accomplish this?

INSERT IGNORE INTO some_table (one,two,three) VALUES(1,2,3)
ON DUPLICATE KEY (INSERT INTO audit_table VALUES(NOW(),'Duplicate key ignored')

我真的不想为此使用PHP:(

I really don't want to use PHP for this :(

谢谢！

推荐答案

如果要考虑使用存储过程，则可以使用

If you want to consider using a stored procedure, you can use a DECLARE CONTINUE HANDLER. Here's an example:

CREATE TABLE users (
    username    VARCHAR(30), 
    first_name  VARCHAR(30), 
    last_name   VARCHAR(30),
    PRIMARY KEY (username)
);

CREATE TABLE audit_table (timestamp datetime, description varchar(255));

DELIMITER $$
CREATE PROCEDURE add_user 
       (in_username    VARCHAR(30),
        in_first_name  VARCHAR(30),
        in_last_name   VARCHAR(30))
    MODIFIES SQL DATA
BEGIN
    DECLARE duplicate_key INT DEFAULT 0;
    BEGIN
        DECLARE EXIT HANDLER FOR 1062 SET duplicate_key = 1;

        INSERT INTO users (username, first_name, last_name)
               VALUES (in_username, in_first_name, in_last_name);
    END;

    IF duplicate_key = 1 THEN
        INSERT INTO audit_table VALUES(NOW(), 'Duplicate key ignored');
    END IF;
END$$
DELIMITER ;

让我们添加一些数据，尝试插入重复的密钥:

Let's add some data, trying to insert a duplicate key:

CALL add_user('userA', 'Bob', 'Smith');
CALL add_user('userB', 'Paul', 'Green');
CALL add_user('userA', 'Jack', 'Brown');

结果:

SELECT * FROM users;
+----------+------------+-----------+
| username | first_name | last_name |
+----------+------------+-----------+
| userA    | Bob        | Smith     |
| userB    | Paul       | Green     |
+----------+------------+-----------+
2 rows in set (0.00 sec)

SELECT * FROM audit_table;
+---------------------+-----------------------+
| timestamp           | description           |
+---------------------+-----------------------+
| 2010-10-07 20:17:35 | Duplicate key ignored |
+---------------------+-----------------------+
1 row in set (0.00 sec)

如果审核在数据库级别上很重要，则您可能只想授予EXECUTE权限，以便数据库用户只能调用存储过程.

If auditing is important on a database level, you may want to grant EXECUTE permissions only so that your database users can only call stored procedures.

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