今兒繼續再看老師給推薦的深入淺出mysql數據庫開發這本書，看到innodb數據庫的外鍵關聯問題時，遇到了一個問題，書上寫的是可以對父表進行修改，從而同步到子表的外鍵上去，可是自己的實驗卻是沒有能夠。
mysql> show create table country\G
*************************** 1. row ***************************
Table: country
Create Table: CREATE TABLE `country` (
`country_id` smallint(5) unsigned NOT NULL auto_increment,
`country` varchar(50) NOT NULL,
`last_update` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`country_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.01 sec)
mysql> show create table city\G
*************************** 1. row ***************************
Table: city
Create Table: CREATE TABLE `city` (
`city_id` smallint(5) unsigned NOT NULL auto_increment,
`city` varchar(50) NOT NULL,
`country_id` smallint(5) unsigned NOT NULL,
`last_update` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`city_id`),
KEY `country_id` (`country_id`),
CONSTRAINT `city_ibfk_1` FOREIGN KEY (`country_id`) REFERENCES `country` (`country_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
mysql> select * from city;
+---------+----------+------------+---------------------+
| city_id | city | country_id | last_update |
+---------+----------+------------+---------------------+
| 1 | hancheng | 1 | 2012-01-09 09:18:33 |
+---------+----------+------------+---------------------+
1 row in set (0.01 sec)
mysql> select * from country;
+------------+---------+---------------------+
| country_id | country | last_update |
+------------+---------+---------------------+
| 1 | chen | 2012-01-09 09:16:38 |
+------------+---------+---------------------+
mysql> update country set country_id=100 where country_id=1;
ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`test/city`, CONSTRAINT `city_ibfk_1` FOREIGN KEY (`country_id`) REFERENCES `country` (`country_id`))
上面的問題是說因為有關聯的存在，所以無法改變country_id這個字段。
然後自己又重新看了下書本，發現自己的sql語句中沒有innodb的外鍵約束方式（cascade,set null,no action,restrict），感覺這就是自己出問題的地方。
可是怎麼加入關聯方式呢，上網找了好半天也沒有合適的方法。就自己找呗，就通過老師說的方法，？help一點兒一點兒終於找到了怎麼改變的方法，文檔功能很強大啊
| ADD {INDEX|KEY} [index_name] [index_type] (index_col_name,...)
| ADD [CONSTRAINT [symbol]]
PRIMARY KEY [index_type] (index_col_name,...)
| ADD [CONSTRAINT [symbol]]
UNIQUE [INDEX|KEY] [index_name] [index_type] (index_col_name,...)
寫了後又是一大堆的錯誤，無從下手啊
mysql> alter table city add CONSTRAINT `city_ibfk_1` FOREIGN KEY (`country_id`) REFERENCES `country` (`country_id`) ON UPDATE CASCADE;
ERROR 1005 (HY000): Can't create table '.\test\#sql-ed0_37.frm' (errno: 121)
zhouqian@zhou:~$ perror 121
OS error code 121: Remote I/O error
MySQL error code 121: Duplicate key on write or update
Can't create table 'test.icity' (errno: 150)-----我這裡也建立索引了。網上的說法是：字段類型和外鍵的索引
作者 輝蛋兒的學習歷程
