MySQL中实现审计日志的两种方法

CREATE TABLE audit_log (
    id INT AUTO_INCREMENT PRIMARY KEY,
    table_name VARCHAR(255),
    operation_type ENUM('INSERT', 'UPDATE', 'DELETE') NOT NULL,
    old_data JSON,
    new_data JSON,
    changed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    changed_by VARCHAR(255) -- 可选：记录执行更改的用户或进程标识
);
DELIMITER //
CREATE TRIGGER before_table_update 
BEFORE UPDATE ON your_table FOR EACH ROW 
BEGIN
    INSERT INTO audit_log (table_name, operation_type, old_data, new_data, changed_by)
    VALUES ('your_table', 'UPDATE',
            JSON_OBJECT('id', OLD.id, 'column1', OLD.column1, 'column2', OLD.column2),
            JSON_OBJECT('id', NEW.id, 'column1', NEW.column1, 'column2', NEW.column2),
            USER());
END//
CREATE TRIGGER after_table_insert 
AFTER INSERT ON your_table FOR EACH ROW 
BEGIN
    INSERT INTO audit_log (table_name, operation_type, new_data, changed_by)
    VALUES ('your_table', 'INSERT',
            JSON_OBJECT('id', NEW.id, 'column1', NEW.column1, 'column2', NEW.column2),
            USER());
END//
CREATE TRIGGER after_table_delete 
AFTER DELETE ON your_table FOR EACH ROW 
BEGIN
    INSERT INTO audit_log (table_name, operation_type, old_data, changed_by)
    VALUES ('your_table', 'DELETE',
            JSON_OBJECT('id', OLD.id, 'column1', OLD.column1, 'column2', OLD.column2),
            USER());
END//
DELIMITER ;