mysql字段索引

drop table if exists `auth_assignment`;
drop table if exists `auth_item_child`;
drop table if exists `auth_item`;
drop table if exists `auth_rule`;

create table `auth_rule`
(
`name`                 varchar(64) not null,
`data`                 text,
`created_at`           integer,
`updated_at`           integer,
primary key (`name`)
) engine InnoDB;

create table `auth_item`
(
`name`                 varchar(64) not null,
`type`                 integer not null,
`description`          text,
`rule_name`            varchar(64),
`data`                 text,
`created_at`           integer,
`updated_at`           integer,
primary key (`name`),
foreign key (`rule_name`) references `auth_rule` (`name`) on delete set null on update cascade,
key `type` (`type`)
) engine InnoDB;

create table `auth_item_child`
(
`parent`               varchar(64) not null,
`child`                varchar(64) not null,
primary key (`parent`, `child`),
foreign key (`parent`) references `auth_item` (`name`) on delete cascade on update cascade,
foreign key (`child`) references `auth_item` (`name`) on delete cascade on update cascade
) engine InnoDB;

create table `auth_assignment`
(
`item_name`            varchar(64) not null,
`user_id`              varchar(64) not null,
`created_at`           integer,
primary key (`item_name`, `user_id`),
foreign key (`item_name`) references `auth_item` (`name`) on delete cascade on update cascade
) engine InnoDB;

auth_rule表没做任何关联，可直接插入

INSERT INTO auth_rule VALUE('rule_name1','rule_data',0,0);
INSERT INTO auth_rule VALUE('rule_name2','rule_data',0,0);
INSERT INTO auth_rule VALUE('rule_name3','rule_data',0,0);

插入auth_item表

INSERT INTO auth_item VALUE('item_name1',1,'item_description','rule_name1','data',0,0);
INSERT INTO auth_item VALUE('item_name2',1,'item_description','rule_name2','data',0,0);
INSERT INTO auth_item VALUE('item_name3',1,'item_description','rule_name3','data',0,0);
INSERT INTO auth_item VALUE('item_name4',1,'item_description','rule_name4','data',0,0);
INSERT INTO auth_item VALUE('item_name5',1,'item_description','rule_name5','data',0,0);

但只插成功了3条，因为auth_item表中rule_name4和rule_name5没有在auth_rule中存在，相关语句

foreign key (`rule_name`) references `auth_rule` (`name`)

插入auth_item_child表

INSERT INTO auth_item_child VALUE('item_name1','item_name2');
INSERT INTO auth_item_child VALUE('item_name3','item_name4');

会提示第二条插入不成功

当我们修改auth_rule表时

UPDATE auth_rule SET NAME='rule_name11' WHERE NAME='rule_name1'

相关表auth_item已会发生变化

相关链接：http://my.oschina.net/sallency/blog/465079