MySQL觸發器錯誤＃2013-查詢期間與MySQL服務器的連接斷開

Question

我想創建一個MySQL觸發器，當將一行插入MySQL表時，在其中執行C ++程序。 為此，我使用的是LIB_MYSQLUDF_SYS，它已成功安裝為UDF。 我的代碼基於本教程。

這是我的觸發代碼：

DELIMITER @@
CREATE TRIGGER startSimulator 
BEFORE INSERT ON `trigger`
FOR EACH ROW 
BEGIN
 DECLARE cmd CHAR(255);
 DECLARE result int(10);
 SET cmd=CONCAT('/home/lab/Dropbox/simulator/version_unified/./simulator');
 SET result = sys_exec(cmd);
END;
@@
DELIMITER ;

如果不清楚，則使用./simulator執行系統程序。 但是，當我使用INSERT INTO trigger (trigger) VALUES (yes)將行插入到“觸發器”表中時，出現以下錯誤：

#2013 - Lost connection to MySQL server during query

當我刪除觸發器時，查詢執行正常。 有誰知道為什么會這樣嗎？

mysqld --log-warnings=2產生：

130719 15:53:59 [Note] Plugin 'FEDERATED' is disabled.
mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
130719 15:53:59 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
130719 15:53:59 InnoDB: The InnoDB memory heap is disabled
130719 15:53:59 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130719 15:53:59 InnoDB: Compressed tables use zlib 1.2.3.4
130719 15:53:59 InnoDB: Initializing buffer pool, size = 128.0M
130719 15:53:59 InnoDB: Completed initialization of buffer pool
130719 15:53:59  InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.

Answer 1

更改

SET cmd=CONCAT('/home/lab/Dropbox/simulator/version_unified/./simulator');

至

SET cmd=CONCAT('/home/lab/Dropbox/simulator/version_unified/simulator');

當文件位於當前工作目錄中時，將使用./。