我今天遇到了同樣的問題,每次觸發(fā)都會導(dǎo)致堆棧溢出.原來我的Zend社區(qū)服務(wù)器安裝附帶了一個默認的my.cnf文件,其中thread_stack大小設(shè)置為128K,這導(dǎo)致每個線程中可用于堆棧的131072字節(jié)：

mysql> show variables where `Variable_name` = 'thread_stack';

+---------------+--------+

| Variable_name | Value |

+---------------+--------+

| thread_stack | 131072 |

+---------------+--------+

所以我在/usr/local/zend/mysql/data/my.cnf中注釋了這一行,重新啟動了mysql守護進程,瞧！ default 192K是

mysql> show variables where `Variable_name` = 'thread_stack';

+---------------+--------+

| Variable_name | Value |

+---------------+--------+

| thread_stack | 196608 |

+---------------+--------+

現(xiàn)在你的桌子& tchester的觸發(fā)器工作完美:)(盡管請注意分隔符)

mysql> CREATE TABLE `job_title` (

-> `job_id` int(11) NOT NULL AUTO_INCREMENT,

-> `position_id` int(11) DEFAULT NULL,

-> `title` varchar(255) COLLATE latin1_general_cs NOT NULL,

-> `selectable` tinyint(4) NOT NULL DEFAULT '0',

-> PRIMARY KEY (`job_id`),

-> UNIQUE KEY `title` (`title`)

-> ) ENGINE=InnoDB;

Query OK, 0 rows affected (0.14 sec)

mysql> DELIMITER &&

mysql> create trigger job_position_trigger

-> before insert on job_title for each row

-> begin

-> if new.position_id is null then

-> set @position = (select max(position_id)+1 from job_title);

-> if @position is null then set @position = 1; end if;

-> set new.position_id = @position;

-> end if;

-> end;

-> &&

Query OK, 0 rows affected (0.29 sec)

mysql> DELIMITER ;

mysql> insert into job_title (title, selectable) values ("test", 1);

Query OK, 1 row affected (0.00 sec)

mysql> insert into job_title (title, selectable) values ("test2", 3);

Query OK, 1 row affected (0.00 sec)

mysql> select * from job_title;

+--------+-------------+-------+------------+

| job_id | position_id | title | selectable |

+--------+-------------+-------+------------+

| 1 | 1 | test | 1 |

| 2 | 2 | test2 | 3 |

+--------+-------------+-------+------------+

2 rows in set (0.00 sec)

你得到的錯誤,131072字節(jié)堆棧使用的9024字節(jié)和所需的128000字節(jié)是有意義的：9024 128000> 131072.

總結(jié)

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