[英]Nested table primary and foreign key in Oracle
I'm trying to add a primary and foreign key to a nested table, struggling to know how. 我正在尝试将主键和外键添加到嵌套表中,努力知道如何操作。
This is what I have; 这就是我的意思;
create or replace type profile as object
(
id VARCHAR2(10), --- Suppose to be Primary Key
userID VARCHAR2(10) --- Suppose to be Foreign Key for user table
);
create or replace type profile_nest as table of profile;
CREATE OR REPLACE TYPE user_t UNDER group_T
(profile profile_nest_ty,);
CREATE TABLE user OF user_t
(id NOT NULL,
PRIMARY KEY (id),
nested table profile store as profile_storage_tbl;
Now the problem is this part, trying to do a foreign key - 现在问题是这部分,试图做一个外键 -
alter table profile_storage_tbl add CONSTRAINT fk_userID FOREIGN KEY (userID)
REFERENCES user(id);
Gives this error - 给出这个错误 -
*Error starting at line 3 in command:
*在命令的第3行开始出错:
alter table profile_storage_tbl add CONSTRAINT fk_userID FOREIGN KEY (userID) REFERENCES user(id)alter table profile_storage_tbl add CONSTRAINT fk_userID FOREIGN KEY(userID)REFERENCES user(id)
Error report:错误报告:
SQL Error: ORA-30730: referential constraint not allowed on nested table column 30730. 00000 - "referential constraint not allowed on nested table column"SQL错误:ORA-30730:嵌套表列30730上不允许引用约束.00000 - “嵌套表列上不允许引用约束”
*Cause: An attempt was made to define a referential constraint on a nested table column.*原因:尝试在嵌套表列上定义引用约束。
Action: Do not specify referential constraints on nested table columns.操作:不要在嵌套表列上指定参照约束。
Either you create 2 separate tables profile_storage_tbl
and user
with a foreign key between them or you create profile_storage_tbl
as a nested table within the user
table. 要么创建2个单独的表
profile_storage_tbl
, 要么在user
之间创建外键, 或者在user
表中创建profile_storage_tbl
作为嵌套表。 It doesn't make sense to try to do both. 尝试两者都没有意义。 (In fact nested tables make little sense to me, period - but that's another matter!)
(事实上,嵌套表对我来说没什么意义,期间 - 但这是另一回事!)
It is just as the exception text says, creating a foreign key constraint on nested table columns is not allowed (Oracle 11). 正如异常文本所说,不允许在嵌套表列上创建外键约束(Oracle 11)。
There is sort of a workaround described here: http://ksun-oracle.blogspot.com/2011/05/foreign-key-on-nested-table.html . 这里描述了一种解决方法: http : //ksun-oracle.blogspot.com/2011/05/foreign-key-on-nested-table.html 。 But there is no guarantee, that this would work on the next oracle release.
但是无法保证,这将适用于下一个oracle版本。
Behind the scene oracle will create two tables profile_storage_tbl and user whereas profile_storage_tbl has a foreign key on user. 在场景后面oracle将创建两个表profile_storage_tbl和user,而profile_storage_tbl在用户上有一个外键。 You can do that on your own, with the advatage to have better control over the releations (also to other tables).
你可以自己做这件事,有利于更好地控制关系(也可以到其他表)。
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