[英]how to use mysql event scheduler to backup logs?
我將我的 sql 操作日志存儲在表 sync_logger 中,我想定期將這些日志保存到常規文件中。 為此,我嘗試創建一個事件調度程序。 但我總是在 select 聲明中收到以下錯誤。
MariaDB [sync]> DELIMITER !!
MariaDB [sync]> CREATE EVENT IF NOT EXISTS write_to_log_event
-> ON SCHEDULE
-> EVERY 1 DAY
-> DO
-> BEGIN
-> DECLARE log_file VARCHAR(255);
-> SET log_file = CONCAT('/var/log/sync_db_log_' ,DATE_FORMAT(NOW(), '%Y%m%d%H%i%S'));
-> SELECT * INTO OUTFILE log_file from sync_logger;
-> DELETE FROM sync_logger;
-> END;
-> !!
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'log_file from sync_logger;
DELETE FROM sync_logger;
END' at line 8
MariaDB [sync]> delimiter ;
我不知道是什么問題。 誰能幫忙?
output文件名是一個字面量,不是參數,不會被替換成變量值。 還必須引用文件名。
使用准備好的語句:
CREATE EVENT IF NOT EXISTS write_to_log_event
ON SCHEDULE
EVERY 1 DAY
DO
BEGIN
SET @write_to_log_event_sql := CONCAT('SELECT * INTO OUTFILE ''/var/log/sync_db_log_' ,
DATE_FORMAT(NOW(), '%Y%m%d%H%i%S'),
''' FROM sync_logger');
-- SELECT @write_to_log_event_sql; -- for debugging purposes
PREPARE stmt FROM @write_to_log_event_sql;
EXECUTE stmt;
DROP PREPARE stmt;
TRUNCATE sync_logger;
END
附言。 TRUNCATE 比 DELETE 快。
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