Traversing data along foreign keys?

Hi,
I am just wondering whether the following scenario is possible.
I have three tables A, B and C, The relationship between them is:
A ----> C ( many-to-one )
B ----> C ( many-to-one )
Now user updates the table C and I know I can capture what has changed by oracle triggers. Now I need to find the corresponding record in the parent table ( either A or B). Is it possible to somehow traverse the data along the foreign keys and when a record in table C is modified figure out whether the corresponding row and its columns/values belong in table A or table B.
Could this be done and where should I refer for more information about this use case.
Thanks

Your scenario is not clear.
You say A--->C (many to one, which I would understand as many A to one C) but then say that either A or B is the parent in which case an ER model would show an arc:
C >--|------- A
C >--|------- B
ie C has foreign key columns A_ID and B_ID, and a check constraint to allow only A_ID or B_ID to be set, but not both.
Back to the trigger question; while updating C of course you can read data from A and B; is that what you are trying to do, or are you trying to insert a parent A or B if required?
Regards Nigel
null

Similar Messages

Data Modeler foreign key names

Hi,
I've been using Data modeller for a while now and it works beautifully, anyhow there is an issue I would appreciate if anybody can help me in.
For foreign keys, if the master table primary key is names ID, the foriegn key will be ID also, and if already there is an ID column column in the detail table, it will be ID1, ID2 ....
Can I change the naming method to be like the oracle designer, or any convention I would like ??
Thanks
AK

I'm using the Logical Model V 1.5.1Paul,
it's pre-production release. Data Modeler is free now and you can download current published release - it.s version 2.0.0.584.
There is "Attributes" page in relationship dialog (version 2.0) and you can see attributes generated by that relationship.
For foreign keys in relational model - there is "Associated columns" page, you also can see referred key there.
Naming templates for FK columns and attributes can be defined in version 2.0.0.584.
Philip

How to fetch column data using foreign key in adf table ?

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Well, I saw in the view query for the association view ( for Many-Many) that the SQL already had the joins with the two ( master) tables to the association table. So I went ahead and added the descriptive columns to the select clause. Then the selected columns showed up in the attribute list by themselves ( without my intervention). So far so good.
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Foreign key checkbox is disabled on all my attributes on every entities.
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Hello,
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There is an option related to their names in Tools>General Options>Model>Logical.
Best regards,
Philip

How to insert value for composed foreign key?

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Thanks in advance.
Mapping is:
â¦.
<database-mapping>
<attribute-name>ffclientCollection</attribute-name>
<read-only>false</read-only>
<get-method-name>getFfclientCollection</get-method-name>
<set-method-name>setFfclientCollection</set-method-name>
<reference-class>uk.co.lsb.elb.toplink.Ffclient</reference-class>
<relationship-partner-attribute-name>clientLoan</relationship-partner-attribute-name>
<is-private-owned>false</is-private-owned>
<uses-batch-reading>false</uses-batch-reading>
<indirection-policy>
<mapping-indirection-policy>
<type>oracle.toplink.internal.indirection.TransparentIndirectionPolicy</type>
</mapping-indirection-policy>
</indirection-policy>
<container-policy>
<mapping-container-policy>
<container-class>oracle.toplink.indirection.IndirectList</container-class>
<type>oracle.toplink.internal.queryframework.ListContainerPolicy</type>
</mapping-container-policy>
</container-policy>
<source-key-fields>
<field>LSB.CLIENT_LOAN.CLIENT_ID</field>
<field>LSB.CLIENT_LOAN.LOAN_ID</field>
</source-key-fields>
<target-foreign-key-fields>
<field>LSB.FFCLIENT.CLIENT_ID</field>
<field>LSB.FFCLIENT.LOAN_ID</field>
</target-foreign-key-fields>
<type>oracle.toplink.mappings.OneToManyMapping</type>
</database-mapping>
â¦..
<database-mapping>
<attribute-name>clientLoan</attribute-name>
<read-only>false</read-only>
<reference-class>uk.co.lsb.elb.toplink.ClientLoan</reference-class>
<relationship-partner-attribute-name>ffclientCollection</relationship-partner-attribute-name>
<is-private-owned>false</is-private-owned>
<uses-batch-reading>false</uses-batch-reading>
<indirection-policy>
<mapping-indirection-policy>
<type>oracle.toplink.internal.indirection.BasicIndirectionPolicy</type>
</mapping-indirection-policy>
</indirection-policy>
<uses-joining>false</uses-joining>
<foreign-key-fields>
<field>LSB.FFCLIENT.CLIENT_ID</field>
<field>LSB.FFCLIENT.LOAN_ID</field>
</foreign-key-fields>
<source-to-target-key-field-associations>
<association>
<association-key>LSB.FFCLIENT.LOAN_ID</association-key>
<association-value>LSB.CLIENT_LOAN.LOAN_ID</association-value>
</association>
<association>
<association-key>LSB.FFCLIENT.CLIENT_ID</association-key>
<association-value>LSB.CLIENT_LOAN.CLIENT_ID</association-value>
</association>
</source-to-target-key-field-associations>
<type>oracle.toplink.mappings.OneToOneMapping</type>
</database-mapping>

Yes, many thanks for you reply.
My project has many layer (include DAO + EJB + BO + WEB).
Toplink objects which are auto created by TopLink has only using in DAO and EJB layer, then toplink objects are transfer to Bean objects (valueObject) which are contain primitive java type as int, long, double... not java wrapper object as Integer, Long, Double... Bean objects are using from EJB to WEB layer. So when set value to bean object from toplink object I sometime don't set all reference toplink object to reference object of bean (although bean has references bean object as toplink object) because there are too big. So when I update data from WEB layer to EJB layer, before update to database, I must get fill all data for foreign key of update object by create new reference toplink object, add reference_id to this object and set it to update object. I waste a lot of time, its very handwork and tire. Are you has any solution about this problem?
Thank in advanced.
ThangNQ

Dropping data from primary Key.

Hi ,
I am deleting data from foreign key and it is dropping 1900 records in 1 sec.
Query 1
delete from abbr_pay_dtl_stag where pif_file_id=118bur after that when I drop records from primary key, it takes more then 2 minutes.
Query 2
delete from line_stage e where bip_pif_file_id =118When I have looked into the explain plan, Query 1 was using Full table scan and Query 2 is using Range Index Scan so I have put hint in Query 2 to use Full table scan, but it is still the same.
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I haven't understood which is the master table and which is the detail table for you haven't given any indication of how the foreign key is created.
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One way with 10g:
select mgr,
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from emp
where mgr is not null
group by mgr;10g:
-- define this function:
create or replace
function concatenate(c Sys_refcursor, sep varchar2 default null) return varchar2
as
val varchar2(100);
return_value varchar2(4000);
begin
-- open c;
loop
fetch c into val;
exit when c%notfound;
if return_value is null then
    return_value:=val;
else
    return_value:=return_value||sep||val;
end if;
end loop;
return return_value;
end;
select mgr,
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from emp
where mgr is not null
group by mgr;With 11g:
select mgr,
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from emp
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group by mgr;

Transfer data from one database to another without identities but keep the relation b/w PK and Foreign key

Hi,
I need to transfer data from one database to another database (both are identical databases).
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2. keep the PK's and FK's relation b/w parent and child table
3. I have 4 levels
Example: tableA (col1 int identity(1,1) , col2, col3)
tableB (col1 int identity(1,1) ,
col2 , col3) -- col2 has the foreign key relation with tableA.col1
tableC (col1 int identity(1,1) ,
col2, col3) -- col2 has the foreign key relation with tableB.col1
tableD (col1 int identity(1,1) , col2, col3) -- col2 has the foreign key relation with tableC.col1
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Thanks in advance

Try the below:
/********************************SAMPLE TARGET***************************************************************/
Use MSDNSamples
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Insert into TableA(name) Select 'R1'
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Insert into TableB(name,LevelValueID) Select 'Childname1',1
/********************************SAMPLE TARGET***************************************************************/
/********************************SAMPLE SOURCE***************************************************************/
Use Sample
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Insert into TableA(name) Select 'C1'
Insert into TableA(name) Select 'C2'
create Table TableB(ChildId int identity(100,1),name varchar(100), LevelValueID int references TableA(LevelValueId))
Insert into TableB(name,LevelValueID) Select 'Kidname1',1
/********************************SAMPLE SOURCE***************************************************************/
USe MSDNSamples
/********************************MIGRATION INTERMEDIATE TABLE***************************************************************/
--Migration table
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/********************************ACTUAL MIGRATION FOR MASTER TABLE***************************************************************/
MERGE INTO TableA
USING sample.dbo.TableA AS tv
ON 1 = 0
WHEN NOT MATCHED THEN
INSERT(name) Values(tv.name)
Output tv.levelValueId ,inserted.LevelValueid INTO
Mg_TableA;
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/********************************ACTUAL MIGRATION FOR CHILD TABLE***************************************************************/
Insert into TableB (name,LevelValueID)
Select A.name,B.NewValueId From sample.dbo.TableB A
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Select * From TableA
Select * From Mg_TableA
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Use Sample
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In ADF how can i insert data in multiple table if they have foreign key

I have started working on ADF and can anybody inform me in ADF how can i insert data in multiple table if they have foreign key,please?
Thnak you very much.

Hello,
Still no luck.I am surely doing silly mistakes.Anyway,Here are my workings-
1> student_mst (id(pk),studentname) and student_guard_mst(id(fk),guardianname)
2> created EO from both of the tables,made id in both EO as DBSequence and an association was also generated.
3> i made that association composite by clicking the checkbox
4> i created 2 VO from 2 EO.
5> put those VO in Application Module.
6> dragged and dropped 2 VO on my jspx page and dropped them as ADF Form.
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Foreign key Mapping based on Data - in SQL Developer Data modeler

Team
Do SQL Developer Data modeler supports Foreign Key mapping based on the Data in the Schema rather defined at the DDL ? For e.g if we implement a Objects Relation ship mapping in Data base, we don't define Foreign keys at table creation.
Toad does this feature through "AUTOMATIC FOREIGN KEYS MAPPING IN TOAD DATA MODELER" more info at (http://toadworld.com/Blogs/tabid/67/EntryId/905/Automatic-Foreign-Keys-Mapping-in-Toad-Data-Modeler.aspx)
any one know how to implement through some scripts also helps me
Regards
Raj

If you have table PKs defined and the candidate columns match those PK columns, then you can use the Discover Foreign Keys utility. Right mouse over the relational model name (node) in the left browser. It is about half way down the menu. I did a blog post about it last week on kentgraziano.com.

SQL Developer Data Modeler - Relation to Foreign Key Generation

SQL Developer Data Modeler 2.0.0 Build 584.
I am having trouble with Relations to Foreign Keys when Forward Engineering a Relational Model from a Logical Model.
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So I right click on the Relational Model from the Browser and Apply Naming Standards to Keys and Constraints.
I uncheck everything but Foreign Keys.
Now, Foreign Keys are named according to my Naming Standards.
However, this process also performs renames on the Column Foreign Keys even though I specifically unchecked that option.
This appears to be a BUG in the software and I haven't found a way around it.
I tried using {column} instead of {ref column} in the Naming Standard Template for Column Foreign Key, but that simply resulted in renaming my columns to "{column}".
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Thanks,
Dan

Hi Philip,
Thanks for the reply.
Is this recorded as a bug to be addressed in the future?
Should I submit this problem via Oracle Support?
The other work-around I came up with is to override every Relation name in the Logical Model with the name I want to use in the Relational Model.
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Regards,
Dan

Mapping error at deployment with foreign key data rule

I have created data rules for enabling foreign key constraints. There are 4 foreign key constraints on the fact table.
For the 1st foreign key ... its a single key match key1 on table 1
For the others, its a composite key .. key1 and key2 on table 2
key1 and key3 on table 3
key1 and key4 on table 4
When I implement with the single key foreign key constraint the mapping works fine. But when I apply the other foreign key data rules for composite keys, I get the following message while deploying ....
M_CNT Create Warning ORA-06550: line 209, column 3:
PL/SQL: ORA-00909: invalid number of arguments
M_CNT Create Warning ORA-06550: line 520, column 65530:
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M_CNT Create Warning ORA-06550: line 56, column 65530:
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M_CNT Create Warning ORA-06550: line 673, column 3:
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Specify the referencing cardinality of row relationship
Minimum Count 1 Maximum Count n
Specify the referenced cardinality of row relationship
Minimum Count 1 Maximum Count n
What is it that I am doing wrong ?
Any suggestions. Help !!!!
Regards,
AW

Hi AW,
How can I overcome this situation ?The best solution as suggested by Jörg is use of surrogate keys.
For every production key (composite or single) generate a corresponding surrogate key using sequence operator in staging area.
This will not just solve your problem but it will be faster also (the joins will be faster with system-generated sequence numbers),
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Regards,

SQL data modeller -- how to create 1 to 1 relationship foreign key ?

hi guys...
i got 2 tables..
table 1 - CFR
CFR_ID = primary key
table 2 - USER_PLAN
USER_ID = primary key
PLAN_ID,
CFR_ID = foreign key reference (table 1)
The business flows go like this..
insdie CFR table, it contain all records / transactions of a particular user/plan. everytime a new transaction occurs for a plan/user, a new CFR_ID / row will be generated.
after which, the newly generated CFR_ID for the new row , will be updated to the CFR_ID in USER_PLAN
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Noob

Hi philips,
Thanks for the wonderful reply..
Just to double comfirm with you,
even if i had set a unique constraint on CFR_ID(foreign key column), inside the relationship model, the relationship between the foreign key is still showing as a 1:m relationship right ?
just that a character 'U' will appear beside the CFR_ID column.
However the diagraphm is still showing a 1:M relationship.
is this correct ?
Regards,
Noob

SQL Developer Data Modeler not drawing foreign key relationships

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Hi Philip,
I believe I have isolated the problem. Apparently if a field is named "FOREIGN..." it interferes with the tool recognizing foreign keys. Try to import a DDL file containing the following text:
CREATE TABLE "SAMPLE"."SAMPLE_ONE"
(     "ID" VARCHAR2(255 CHAR) NOT NULL ENABLE,
     "VALUE" VARCHAR2(255 CHAR),
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TABLESPACE "SAMPLE_DATA" ;
CREATE TABLE "SAMPLE"."SAMPLE_TWO"
(     "ID" VARCHAR2(255 CHAR) NOT NULL ENABLE,
     "FOREIGN_NAME" VARCHAR2(255 CHAR),
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TABLESPACE "SAMPLE_DATA" ;
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(     "ID" VARCHAR2(255 CHAR) NOT NULL ENABLE,
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TABLESPACE "SAMPLE_DATA" ENABLE,
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     REFERENCES "SAMPLE"."SAMPLE_ONE" ("ID") ENABLE
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-ttamon

How to alter or add foreign key constr to table having child rows or data

Hi,
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I need to add the foreign key without deleting the data in the EMP table.
Please advice.
Regards,
Vinesh

Hi,
I need to add the foreign key without deleting the data in the EMP table.Foreign key constraint can have only those values which are present in the primary key of the parent table or null.
When your tables are populated with values and then you are adding the constraint then,
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Example
SQL> create table emp_bkp as select * from emp;
Table created.
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Table created.
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2 add constraint pk_deptno primary key(deptno);
Table altered.
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        20
        40
        10
SQL> select deptno from dept_bkp;
    DEPTNO
        10
        20
        30
        40
        55
SQL> alter table emp_bkp
2   add constraint fk_deptno_bkp foreign key(deptno)
3    references dept_bkp(deptno);
Table altered.
SQL> alter table emp_bkp
2 drop constraint fk_deptno_bkp;
Table altered.
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1 row created.
SQL> alter table emp_bkp
2 add constraint fk_deptno_bkp foreign key(deptno)
3   references dept_bkp(deptno);
add constraint fk_deptno_bkp foreign key(deptno)
ERROR at line 2:
ORA-02298: cannot validate (SCOTT.FK_DEPTNO_BKP) - parent keys not found
SQL> update emp_bkp
2 set deptno=null
3 where empno=142;
1 row updated.
SQL> alter table emp_bkp
2 add constraint fk_deptno_bkp foreign key(deptno)
3   references dept_bkp(deptno);
Table altered.
SQL> insert into dept_bkp (deptno,dname)values(90,'IT');
1 row created.
SQL> update emp_bkp
2 set deptno=90
3 where empno=142;
1 row updated.Twinkle

Traversing data along foreign keys?

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