Complex many to many relationships
I am new to Oracle ADF and i have a question about associations.
I have 3 business objects: User, Position and Country. A User can have different Positions for each Country. Therefore, i decided to create another BO, named UserPosition which has 4 attributes: Id, UserId, PositionId and CountryId.
I wonder which is the best way to define associations for these objects.
Should i define three "1 to *" associations between each BO's and UserPosition?
Thanks.
Usually if you have two tables with many-to-many relationship, you would have third table and its PK should be made of from 1st and 2nd tables. I think you are right. You need the 4th one with a new PK.
Similar Messages
-
Creating data in a many-to-many-relationship
Hello,
we really have problems in implementing a JClient dialog based on BC4J for creating data in a many to many relationship - especially with cascade delete on both sides.
Simplified our tables look like:
create table A_TABLE
A_ID VARCHAR2(5) not null,
A_NAME VARCHAR2(30) not null,
constraint PK_A_TABLE primary key (A_ID),
constraint UK_A_TABLE unique (A_NAME)
create table B_TABLE
B_ID VARCHAR2(5) not null,
B_NAME VARCHAR2(30) not null,
constraint PK_B_TABLE primary key (B_ID),
constraint UK_B_TABLE unique (B_NAME)
create table AB_TABLE
A_ID VARCHAR2(5) not null,
B_ID VARCHAR2(5) not null,
constraint PK_AB_TABLE primary key (A_ID, B_ID),
constraint FK_AB_A foreign key (A_ID) references A_TABLE (A_ID) on delete cascade,
constraint FK_AB_B foreign key (B_ID) references B_TABLE (B_ID) on delete cascade
Could JDev Team please provide a BC4J/JClient sample that performs the following task:
The dialog should use A_TABLE as master and AB_TABLE as detail. The detail displays the names associated with the IDs. Next to AB_TABLE should be a view of B_TABLE which only displays rows that are currently not in AB_TABLE. Two buttons are used for adding and removing rows in AB_TABLE. After adding or removing rows in the intersection the B_TABLE view should be updated. The whole thing should work in the middle and client tier. This means no database round trips after each add/remove, no posts for AB_TABLE and no query reexecution for B_TABLE until commit/rollback.
This is a very common szenario: For an item group (A_TABLE) one can select and deselect items (AB_TABLE) from a list of available items (B_TABLE). Most of JDeveloper4s wizards use this. They can handle multi/single selections, selections from complex structures like trees and so on. Ok, the wizards are not based on BC4J - or? How can we do it with BC4J?
Our main problems are:
1. Updating the view of B_TABLE after add/remove reflecting the current selection
2. A good strategy for displaying the names instead of the IDs (subqueries or joining the three tables)
3. A JBO-27101 DeadEntityAccessException when removing an existing row from AB_TABLE and adding it again
Other problems:
4. We get a JBO-25030 InvalidOwnerException when creating a row in AB_TABLE. This is caused by the composition. We workaround this using createAndInitRow(AttributeList) on the view object (instead of create()). This is our add-Action:
ViewObject abVO = panelBinding.getApplicationModule().findViewObject("ABView");
ViewObject bVO = panelBinding.getApplicationModule().findViewObject("BView");
Row bRow = bVO.getCurrentRow();
NameValuePairs attribList = new NameValuePairs(
new String[]{"BId"}, new Object[]{bRow.getAttribute("BId")});
Row newRow = abVO.createAndInitRow(attribList);
abVO.insertRow(newRow);
5. After inserting the new row the NavigationBar has enabled commit/rollback buttons and AB_TABLE displays the row. But performing a commit does nothing. With the following statement after insertRow(newRow) the new row is created in the database:
newRow.setAttribute("BId", bRow.getAttribute("BId"));
Please give us some help on this subject.
Best regards
Michael Thal<Another attempt to post a reply. >
Could JDev Team please provide a BC4J/JClient sample
that performs the following task:
The dialog should use A_TABLE as master and AB_TABLE
as detail. The detail displays the names associated
with the IDs. Next to AB_TABLE should be a view of
B_TABLE which only displays rows that are currently
not in AB_TABLE. Two buttons are used for adding and
removing rows in AB_TABLE. After adding or removing
rows in the intersection the B_TABLE view should be
updated. The whole thing should work in the middle
and client tier. This means no database round trips
after each add/remove, no posts for AB_TABLE and no
query reexecution for B_TABLE until commit/rollback.
This is a very common szenario: For an item group
(A_TABLE) one can select and deselect items
(AB_TABLE) from a list of available items (B_TABLE).
Most of JDeveloper4s wizards use this. They can
handle multi/single selections, selections from
complex structures like trees and so on. Ok, the
wizards are not based on BC4J - or? How can we do it
with BC4J?
Our main problems are:
1. Updating the view of B_TABLE after add/remove
reflecting the current selectionYou should be able to use insertRow() to insert the row into proper collection.
However to remove a row only from the collection, you need to add a method on the VO subclasses (and perhaps export this method so that the client side should see it) to unlink a row from a collection (but not remove the associated entities from the cache).
This new method should use ViewRowSetImpl.removeRowAt() method to remove the row entry at the given index from it's collection. Note that this is an absolute index and not a range index in the collection.
2. A good strategy for displaying the names instead
of the IDs (subqueries or joining the three tables)You should join the three tables by using reference (and perhaps readonly) entities.
3. A JBO-27101 DeadEntityAccessException when
removing an existing row from AB_TABLE and adding it
againThis is happening due to remove() method on the Row which is marking the row as removed. Attempts to add this row into another collection will throw a DeadEntityAccessException.
You may 'remove the row from it's collection, then call 'Row.refresh' on it to revert the entity back to undeleted state.
>
Other problems:
4. We get a JBO-25030 InvalidOwnerException when
creating a row in AB_TABLE. This is caused by the
composition. We workaround this using
createAndInitRow(AttributeList) on the view object
(instead of create()). This is our add-Action:
ViewObject abVO =
O =
panelBinding.getApplicationModule().findViewObject("AB
iew");
ViewObject bVO =
O =
panelBinding.getApplicationModule().findViewObject("BV
ew");
Row bRow = bVO.getCurrentRow();
NameValuePairs attribList = new NameValuePairs(
new String[]{"BId"}, new
String[]{"BId"}, new
Object[]{bRow.getAttribute("BId")});
Row newRow = abVO.createAndInitRow(attribList);
abVO.insertRow(newRow);This is a handy approach. Note that Bc4j framework does not support dual composition where the same detail can be owned by two or more masters. In those cases, you also need to implement post ordering to post the masters before the detail (and reverse ordering for deletes).
>
5. After inserting the new row the NavigationBar has
enabled commit/rollback buttons and AB_TABLE displays
the row. But performing a commit does nothing. With
the following statement after insertRow(newRow) the
new row is created in the database:
newRow.setAttribute("BId",
d", bRow.getAttribute("BId"));This bug in JDev 903 was fixed and a patch set (9.0.3.1) is (I believe) available now via MetaLink.
>
>
Please give us some help on this subject.
Best regards
Michael Thal -
Hierarchical query with many-to-many relationship
I have read with interest the creative solutions to complex hierarchical queries posted previously; they have been instructive but have not quite addressed this scenario.
We have a hierarchy table H, with columns for ID, name, parentID, and other attributes.
Within this table are a number of independent hierarchies, each existing for a different purpose.
We have a master list of hierarchies in table T which describes the purpose of each hierarchy, provides some default attributes which the nodes can inherit, and stores a unique id for each hierarchy and a pointer to the root node of the corresponding hierarchy in table H.
We have a master list of items M, with identically named columns to those in H, along with many other attributes.
The members of table M ALL belong to EACH of the Hierarchies. So we have a link table I to define the intersection of H and M.
So the leaf nodes of H are really containers for the list of elements from M which may be attached to them.
The universe of M is very volatile, with new members being added, old ones deleted, and existing ones being reclassified frequently from node to node within each hierarchy. Since the hierarchies have to be built to handle every possible scenario, so that the members of M can always find a suitable node to reside in, quite often, in fact more often than not, the majority of leaf nodes for each hierarchy are empty at any given moment.
Therefore, although we always know the root sector of a given hierarchy and can traverse downwards from there, if we worked our way up from the intersection table, we could eliminate up to 70% of the nodes of any given hierarchy from further consideration, as they don't need to be (in fact, must not be) included in reports.
As implied by the above, rows in M are structurally similar (in terms of columns, but not in any real world sense) and are a superset of rows in H. But combining them into the one table doesn't seem to help the reporting process due to the many-to-many relationship which prevents the ID/parentID relationship from being carried through to this level.
There are a number of other considerations of which the most pertinent is that the people using this database generally have an interest in only a subset of the master list of items in M. This relationship is also dynamic but important enough and rigid enough that another link table P exists to combine the Users in table U with the subset of M in which they are interested. (The users are also grouped into hierarchies of a totally different nature, but this aspect is secondary for now.)
The reporting is reasonably straightforward for any single combination of User and Hierarchy; they want to see all the items they are interested in, listed in hierarchical sequence, totalled on change of level with the individual items M listed beneath the nodes of H. This is unfortunately required in real time, so retrieval performance is paramount.
Some statistics might help to determine the optimum approach:
The largest hierarchy has 10,000 nodes. The smallest about 100.
The largest would have 70% or more of its nodes unused at any point in time, and even the smallest would have 25% unused.
The hierarchies tend to be broad rather than deep, the maximum number of levels being about 5; but the larger ones should be twice as deep as this if performance was not compromised.
There are dozens of hierarchies, but it may be possible to sharply reduce this number by exploiting the Order Siblings By clause.
The number of rows in M varies between 500,000 and 50,000; depending upon how long historical data is retained on-line (and performance permitting, it would be retained indefinitely).
The number of users varies between 1000 and 2000 but the range of M in which they are interested varies greatly; from as few as 100 to as many as 10,000+. So it is almost always worth beginning by eliminating the items in which they are not interested, implying once again that the hierarchy should be traversed upwards rather than down from the root.
The current system is very old and survives by a tactic of building what are essentially materialised views of the database structure for each user overnight using, ahem, non-relational technology. This is inefficient and not easily scaled (but it works) and hence this redevelopment project needs to (a) work, and (b) work better and faster.
I am happy to provide some DDL scripts if that helps explain the problem better than this narrative.
I can't help feeling that the solution lies in somehow extending the hierarchical query past the many-to-many link table so that the Master list can be merged directly into the hierarchy such that the M items become the leaf nodes rather than the design outlined above - but I don't know how to do that. But I am sure everyone reading this does! :)
All advice appreciated. Database version is not an issue; we are currently using version 10XE for experimentation, but production usage could be on 11 if that contains helpful features.
Thank you
CSHi,
ChrisS. wrote:
I am happy to provide some DDL scripts if that helps explain the problem better than this narrative.Yes, please do.
The problem seems interesting, I'm sure many people here (including myself) are willing to help you in this matter.
So yes, post DDL for the tables, as well as INSERTs to populate them with representative data. Please also include the output you require along with detailed explanations about the logic to get it.
Don't forget to put lines of code between {code} tags in order to preserve formatting and readability, like this :
SELECT sysdate FROM dual;Thanks. -
Modeling a many-to-many relationship in a dimension
Hi, I'm using AWM and I need to create a book dimension which aggregates books about their authors.
My table is: BRIDGE_TABLE_BOOKS(book_key, author_key)
Its data are for example:
Book - Author
1 - 1
1 - 2
2 - 1
3 - 2
4 - 1
4 - 2
5 - 1
because a book can be written by 1 or more authors.
I'd like that AWM could aggregate them through authors as follows:
1
->1
->2
->4
->5
2
->1
->3
->4
is it possibile in AWM?many-to-many relationships are always represented as fact tables in a dimensional model (Kimball likes the idea of the "bridge" table...but in my opinion a bridge table is nothing more than a 2 dimensional fact table). Doesn't matter whether you're using relational or OLAP, works the same either way.
Simply create a cube dimensioned by book and author. Have a character or boolean measure with Y/N or true/false. Insert tuples where a given book was written by a given author. This is one area where relational is better - don't have to have a dummy measure, just make a "factless fact table" (you can do this in Oracle OLAP also...but it's gotten to the point where Oracle has tried to hide all the complexity of the OLAP language. Unfortunately, that hides a lot of power also...)
What type of reports are you trying to get out?
Thx,
Scott -
Many to Many Relationships in ejb.....Urgent Pls help
hi all,
Am working in EJB.Now we are coding for many to many relationship.
Company and Salary register
One Company can have many salary register and More than one company can have one salary register
Companyand Salary register are the two tables having details of it.And the intermediate table having pk of company and salary register is Company_salary_register table,I want to add the value in this table having seperate interface.
How to model it? I have given the add method of this company_salary_register table in company bean.I am getting the value of this one as collection.But it is asking me to add the values as the instance of LocalSalary(interfaceand entitybean).If i type cast it as Local Salary Class castexception occurs
Please help me.Even Material of Modelling Many to Many relationship in EJB is enough.
thanx in advance,THaaaaaanks alottt for the quick reply...
I used the first way to insert the document and i was successful...
but thing is that..
when i do
SQL>desc message_type
message_type is NOT FINAL
Name Null? Type
SYS_XDBPD$ XDB.XDB$RAW_LIST_T
to VARCHAR2(4000 CHAR)
from VARCHAR2(4000 CHAR)
subject VARCHAR2(4000 CHAR)
body VARCHAR2(4000 CHAR)
i can see the structure...
and when i
select count(*) from messages
it says count is 1.
so how to know where the data is ..like below in the data :
'to' it has '[email protected]'
and for 'from' it has '[email protected]'..and so on..
<message>
<to>[email protected]</to>
<from>[email protected]</from>
<subject>Question</subject>
<body>Does this demo work?</body>
</message>
so what is the command to get that data...
because when i do
select * from message_type..it says
select * from message_type
ERROR at line 1:
ORA-04044: procedure, function, package, or type is not allowed here
Plss help me outt.......this will be my final step...
Thankssssssssssssssss -
Many-to-many relationship - show all values
Hi,
I'm building a cube in 2008R2 and have a many-to-many relationship through a bridging table but when displaying the results it is effectively an inner join and I would like to see a full outer join with the unknown rows set to "unknown".
I've managed to achieve this by doing a full outer join in the view that creates my bridging table and having an unknown member in my dimensions but then when I added in a dimension that wasn't directly related to the bridging table the unknown rows
were removed again. I was able to get past this by adding a row to my fact table with all the keys set to unknown and the metrics set to zero.
Whilst this works it really does not seem like an ideal solution, especially as previously empty metrics are now returning a zero.
Is there any way to achieve this in SSAS? Perhaps in the way unknown members are processed?
Thanks,cccparkhill,
What you did is the only way to achieve what you want.
In cubes you connect Dimensions throw Facts. By definition dimensions are
“How do business people describe the data that
results from the business process?”
and facts are “What are we measuring?”, noting the underlined
we can understand that _normally and usually_ the relation between the dimensions and the facts represent incidents happened in the real world ... the way you approach, think, and deal with dimensions and facts in cubes is different than dealing with tables
in normal relational transnational database.
Personally I do what you did when I want to achieve "Left join"
Please mark this reply as the answer
or vote as helpful, as appropriate, to make it useful for other readers -
In powerpivot we are facing problem in resolving the many-to-many relationship between tables.
Current table schema is:
Having 4 tables-
Bills - columns are- Bill No(primary key)
Billing Fee Table-Fee ID(primary key), Bill Type, Sub Bill Type
FeeList Table-FeeList ID(primary key),Fee ID(Foriegn Key to Billingble),
Bill No(Foriegn Key to Bills)
Payments Table-Pay ID(Primary Key), Bill No(Foriegn Key to Bills)
Bills is the primary table for Feelist Table
and Payments Table -Bill No is the primary key.
Billing Fee Table is primary table for FeeList Table -
Fee ID is the primary key.
To create a pivot table using Payments Table, I need
Bill Type and Sub Bill Type. Hence fetched from
Biling Fee Table to FeeList Table based on the
Fee ID column using RELATED function.
As FeeList Table and Payments Table is having duplicate
Bill Nos, it is not possible to get Bill Type and
Sub Bill Type to Payments Table. I am trying to use LOOKUPVALUE
function to get data based on the Bill No, as there is no direct relationship exists between these two tables.
I have tried using
=LOOKUPVALUE('FeeList Table'[Sub Bill Type], 'FeeList Table'[Bill No], 'Payments Table'[Bill No]) function. But
the lookupvalue function returns an error if a duplicate is found.
Error is as below:
Calculation error in column 'Payments Table'[Sub Bill Type]: A table of multiple values was supplied where a single value was expected.
Kindly assist to resolve this issue.
ThanksHi Rekha,
What should your LOOKUPVALUE return if multiple rows are found in the FeeListTable? By the way it should work if a really finds "duplicates" (i.e. multiple times the same return value) but fails if it returns multiple rows with different values.
If you for example would want to return the first entry that was found, you could try (have not checked in PP for typos):
CALCULATE(MIN('FeeList Table'[Sub Bill Type]),
FILTER('FeeList Table',
'FeeList Table'[Bill No] = 'Payments Table'[Bill No]
Edit: a very nice way to handle Many-to-Many relationships is explained here:
http://blog.gbrueckl.at/2012/05/resolving-many-to-many-relationships-leveraging-dax-cross-table-filtering/
Julian Wissel | BI for NAV @ http://en.navbi.com | Blog @ blog.navida.eu -
Many to many relationship mapping.
Hi
I have a basic question on how to create a good java class model (POJOs) based on the database model.
I Have to follwing tables
Table1 with columns as
ID1
name
description
Table2 with columns as
ID2
dateCreated ..etc.
Since there is a many to many relationship between table1 and table2
So to map that we have a table3 with columns
ID3
ID1 // fk table1
ID2 // fk table2
browserName
startTime
endTime
So when I create Java classes:
// corresponding to table 1
Class MyTable1
private Integer ID1;
private List ID2; // to map with the table2
// corresponding to table 2
Class MyTable2
private Integer ID2
private List ID1; // to map with table 1
In this way I can create my classes. Is this the best way to put it together.
And where to put the attributed specific to table3. Like the BrowserName and the StartTime and the EndTime.
Any suggestion please.
Thanks.Your names leave a lot to be desired. Let's start with an example. Suppose I have a problem involving employees and the tasks assigned to them. An employee may have any number of tasks assigned to them and a task can be assigned to any number of employees. The assignment itself has more attributes: when it was assigned, its priority and so on.
public interface Employee {
Long getId(); //etc...
Set<Assignment> getAssignments();
void setAssignments(Set<Assignment> assignments);
public interface Task {
Long getId(); //etc...
Set<Assignment> getAssignments();
void setAssignments(Set<Assignment> assignments);
public interface Assignment {
Long getId(); //etc...
Employee getEmployee();
void setEmployee(Employee employee);
Task getTask();
void setTask(Task task);
}This assumes you want to navigate in all directions: from an employee to their assignments, from a task to its assignments and from an assignment to it employee and task. -
Many to many relationship does not work on certain role played dimension
Hi,
I have a cube with role playing Account dimension, used once as “Account” and once as “Other Account” dimension.
I’ve added Trip dimension related to the account dimension by a bridge table AccountTrip
making a many to many relationship (many accounts can be in one trip and one account can go to many trips).
When I added the bridge measure group to the cube, I saw in the dimension usage tab that the relationship between the bridge and the Account dimension was done automatically.
I added the trip dimension with regular relationship to the bridge measure group and many to many relationship to the main fact table using the bridge group.
All compiled fine and gave correct results. Then I noticed that when slicing the fact table by the Other account dimension I get correct results,
but when I add the Trip dimension I get the results as if I was slicing by the Account dimension, not by the “Other account” dimension.
I checked the cube and noticed I did not set the relationship between the bridge to the “Other Account” dimension (role playing). I set it now (regular relationship, same as the account dimension), but still getting the same results.
Conclusion- when slicing by the new Trip (M2M) dimension and the “Other Account”
(role played) dimension I get the results of the “Account” dimension, not those of the “Other Account” dimension.
I checked the relationships of the “Other Account” dimension in the cube but it looks correctly set (to the external account of the main fact table and to account of the bridge table).
(Just to note I have two other bridges on the cube which are not related and don’t look like they need to be related, plus two other measure groups of the main fact table used for distinct count which are related appropriately).
What else should be done???
I would greatly appreciate your help!
Thanks
NamnamiThe update server is down; try this temporary workaround
App Store>Purchased>Select "All"
Note: Look out for apps that have the word "Update"
http://i1224.photobucket.com/albums/ee374/Diavonex/9c256282736869f322d4b3071bbb2 a82_zps51a6f546.jpg -
Many to many relationships (Again)
Hello,
There was a posting on above subject.
Re: Many to many relationships between Fact and Dimension
They asked to look chapter 3 in the user's guide... <http://download.oracle.com/docs/pdf/B10996_01.pdf>. chapter 3 talks about defining Oracle Data Objects. I could find above subject in chapter 3 .
Here is our situation We are using OWB 9.2.0.2.8. We are in a situation to build ETL from denormalized (relational tables) source to normalized target (relational tables). It is not a data warehouse situation. It could be a reverse of data warehouse. As given below
Supplier >--------------------<Item
becomes Supplier ------<supp_item.>--------------Item after many to many resolution, Where supp_item is interface table.
We were able build Supplier and Item through seprate mapping. I could build supp_item through post mapping process. I look for alternate thought as well.
We are using separate sequence number for Supplier , Item and supp_item. The sequences will be surrogate keys such as Supplier ( Suppseq(PK)), Item (Itemseq (PK)) and supp_item(suppitemseq (PK)) Here is the sample
Supplier
001|S001
002|S002
003|S003
004|S004
Item
001|I001
002|I002
003|I003
Supp_item (Suppseq|ItemSeq)
001|002 --- S001 I002
001003 -----S001 I003
001|004 ----- S001 I 004
002|002 ---- S 002 I002
002|003 ---- S 002 I003
003|001 --- S 003 I 003
003|003 --- S 003 I 003
Did any body face such situation? What is the best way to create a mapping (single map or multiple map with processflow sequence) for this situation?
Let me know the steps exercised in OWB for this situation.
I appreciate your help.
Regards
RamHi Ram,
The easiest way to do this, would be to:
- Load supplier in one mapping and generate the surrogate key.
- Load item another (or the same) mapping and generate the surrogate key.
- Load supplier_item in its own separate mapping, using a key lookup (or join) to (with) the supplier and item tables.
Needless to say, you should create unique keys on the natural key of the supplier and item tables, to enable quick index-based lookups and make sure you get one unique value for every value of the natural key.
Hope this helps,
Mark. -
Defining a many-to-many relationship with CMP EJBs : does it work for you
Curious to know whether someone has been able to set up a many to many relationship between two entity beans.
I have been struggling with this for days now and I can't get it to work.
In my test project I have two entity beans, resp. Consultant and Solution.
Consultant has a cmr field called 'solutions', which is a collection object from the opposite side (Solution).
This is the source of the ejb-jar.xml file
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<description>EJB JAR description</description>
<display-name>EJB JAR</display-name>
<enterprise-beans>
<session>
<ejb-name>ProfilerBean</ejb-name>
<home>com.atosorigin.tcc.testing.ejbses.profiling.ProfilerHome</home>
<remote>com.atosorigin.tcc.testing.ejbses.profiling.Profiler</remote>
<local-home>com.atosorigin.tcc.testing.ejbses.profiling.ProfilerLocalHome</local-home>
<local>com.atosorigin.tcc.testing.ejbses.profiling.ProfilerLocal</local>
<ejb-class>com.atosorigin.tcc.testing.ejbses.profiling.ProfilerBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
<ejb-local-ref>
<ejb-ref-name>EJBTesting/Solution</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<local-home>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionLocalHome</local-home>
<local>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionLocal</local>
<ejb-link>SolutionBean</ejb-link>
</ejb-local-ref>
<ejb-local-ref>
<ejb-ref-name>EJBTesting/Consultant</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<local-home>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantLocalHome</local-home>
<local>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantLocal</local>
<ejb-link>ConsultantBean</ejb-link>
</ejb-local-ref>
</session>
<entity>
<ejb-name>ConsultantBean</ejb-name>
<home>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantHome</home>
<remote>com.atosorigin.tcc.testing.ejbcmp.profiling.Consultant</remote>
<local-home>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantLocalHome</local-home>
<local>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantLocal</local>
<ejb-class>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>Consultant</abstract-schema-name>
<cmp-field>
<field-name>firstname</field-name>
</cmp-field>
<cmp-field>
<field-name>lastname</field-name>
</cmp-field>
<cmp-field>
<field-name>country</field-name>
</cmp-field>
<cmp-field>
<field-name>id</field-name>
</cmp-field>
<primkey-field>id</primkey-field>
<query>
<query-method>
<method-name>findBySolution</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql>SELECT Object(c) FROM Consultant AS c,
IN(c.solutions) s WHERE s.id = ?1 </ejb-ql>
</query>
</entity>
<entity>
<ejb-name>SolutionBean</ejb-name>
<home>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionHome</home>
<remote>com.atosorigin.tcc.testing.ejbcmp.profiling.Solution</remote>
<local-home>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionLocalHome</local-home>
<local>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionLocal</local>
<ejb-class>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>Solution</abstract-schema-name>
<cmp-field>
<field-name>description</field-name>
</cmp-field>
<cmp-field>
<field-name>name</field-name>
</cmp-field>
<cmp-field>
<field-name>parent</field-name>
</cmp-field>
<cmp-field>
<field-name>id</field-name>
</cmp-field>
<primkey-field>id</primkey-field>
<query>
<query-method>
<method-name>findChildSolutions</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql>SELECT Object(s) FROM Solution AS s WHERE
s.parent = ?1</ejb-ql>
</query>
<query>
<query-method>
<method-name>findTopLevelSolutions</method-name>
<method-params/>
</query-method>
<ejb-ql>Select Object(s) FROM Solution AS s WHERE
(s.parent = 'none')</ejb-ql>
</query>
</entity>
</enterprise-beans>
<relationships>
<ejb-relation>
<description>A consultant may have one or more areas of expertise</description>
<ejb-relation-name>Consultant_Solutions</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>com.atosorigin.tcc.testing.ejbcmp.profiling.ConsultantBean</ejb-relationship-role-name>
<multiplicity>Many</multiplicity>
<relationship-role-source>
<ejb-name>ConsultantBean</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>solutions</cmr-field-name>
<cmr-field-type>java.util.Collection</cmr-field-type>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>com.atosorigin.tcc.testing.ejbcmp.profiling.SolutionBean</ejb-relationship-role-name>
<multiplicity>Many</multiplicity>
<relationship-role-source>
<ejb-name>SolutionBean</ejb-name>
</relationship-role-source>
</ejb-relationship-role>
</ejb-relation>
</relationships>
<assembly-descriptor>
<container-transaction>
<description>container-transaction</description>
<method>
<ejb-name>SolutionBean</ejb-name>
<method-name>*</method-name>
</method>
<method>
<ejb-name>ProfilerBean</ejb-name>
<method-name>*</method-name>
</method>
<method>
<ejb-name>ConsultantBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
I created a stateless session bean as a business facade for the two entity beans. I then created a webservice to test the beans.
What works :
- create a consultant
- get a consultant
- create a solution
- get a solution
(basically everything that doesn't involve the relationship field.
However, what doesn't work is the method call assignSolution:
- assign solution : this is implemented as follows
Business Method.
public void assignSolution(String consultantID, String solutionID)
throws ProfilingException {
// TODO : Implement
ConsultantLocal cons = null;
SolutionLocal sol = null;
try {
cons = consHome.findByPrimaryKey(consultantID);
sol = solHome.findByPrimaryKey(solutionID);
Collection solutions = cons.getSolutions();
solutions.add(sol);
//sol.getConsultants().add(cons);
} catch (FinderException ex) {
ex.printStackTrace();
throw new ProfilingException("failed to retrieve data from DB", ex);
As you can see I am trying to use the CM Relationship in this methhod. Adding the solution to a consultant should be as simple as adding a solution object to the collection retrieved with the getSolutions accessor. The Container is expected to persist the information in my MAXDB database.
However this doesn't happen.
The ORM details as defined in the persistent.xml follows :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE persistent-ejb-map SYSTEM "persistent.dtd">
<persistent-ejb-map>
<locking
type="Table"/>
<db-properties>
<data-source-name>TCC_PORTAL_PROFILER</data-source-name>
<database-vendor
name="SAPDB"/>
</db-properties>
<entity-beans>
<entity-bean>
<ejb-name>ConsultantBean</ejb-name>
<table-name>PFL_CONSULTANTS</table-name>
<field-map
key-type="NoKey">
<field-name>firstname</field-name>
<column>
<column-name>FIRSTNAME</column-name>
</column>
</field-map>
<field-map
key-type="NoKey">
<field-name>lastname</field-name>
<column>
<column-name>LASTNAME</column-name>
</column>
</field-map>
<field-map
key-type="NoKey">
<field-name>country</field-name>
<column>
<column-name>COUNTRY</column-name>
</column>
</field-map>
<field-map
key-type="PrimaryKey">
<field-name>id</field-name>
<column>
<column-name>ID</column-name>
</column>
</field-map>
<finder-descriptor>
<method-name>findBySolution</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
<load-selected-objects
lock="read"/>
</finder-descriptor>
</entity-bean>
<entity-bean>
<ejb-name>SolutionBean</ejb-name>
<table-name>PFL_SAPSOLUTIONS</table-name>
<field-map
key-type="NoKey">
<field-name>description</field-name>
<column>
<column-name>DESCRIPTION</column-name>
</column>
</field-map>
<field-map
key-type="NoKey">
<field-name>name</field-name>
<column>
<column-name>NAME</column-name>
</column>
</field-map>
<field-map
key-type="NoKey">
<field-name>parent</field-name>
<column>
<column-name>PARENTID</column-name>
</column>
</field-map>
<field-map
key-type="PrimaryKey">
<field-name>id</field-name>
<column>
<column-name>ID</column-name>
</column>
</field-map>
<finder-descriptor>
<method-name>findChildSolutions</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
<load-selected-objects
lock="read"/>
</finder-descriptor>
<finder-descriptor>
<method-name>findTopLevelSolutions</method-name>
<method-params/>
<load-selected-objects
lock="read"/>
</finder-descriptor>
</entity-bean>
</entity-beans>
<relationships>
<table-relation>
<help-table>PFL_CONS_SOL_MAP</help-table>
<table-relationship-role
key-type="PrimaryKey">
<ejb-name>ConsultantBean</ejb-name>
<cmr-field>solutions</cmr-field>
<fk-column>
<column-name>CONSULTANTID</column-name>
<pk-field-name>id</pk-field-name>
</fk-column>
</table-relationship-role>
<table-relationship-role
key-type="PrimaryKey">
<ejb-name>SolutionBean</ejb-name>
<fk-column>
<column-name>SOLUTIONID</column-name>
<pk-field-name>id</pk-field-name>
</fk-column>
</table-relationship-role>
</table-relation>
</relationships>
</persistent-ejb-map>
The error in the default trace file when calling the method states, there is an "inconsistency in the number of primary keys". Details follow.
#1.5#000F1F188E5C004400000000000010480003E76C80EFD57A#1098880364327#com.sap.engine.services.ejb#com.atosorigin.tcc/EJBCMPProfilingTest#com.sap.engine.services.ejb#Guest#2####4d2b2370281411d9a40d000f1f188e5c#SAPEngine_Application_Thread[impl:3]_31##0#0#Error##Java###
[EXCEPTION]
#1#com.sap.engine.services.ejb.exceptions.BaseRemoteException: Exception in method assignSolution.
at com.atosorigin.tcc.testing.ejbses.profiling.ProfilerObjectImpl0.assignSolution(ProfilerObjectImpl0.java:822)
at com.atosorigin.tcc.testing.ejbses.profiling.Profiler_Stub.assignSolution(Profiler_Stub.java:533)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187)
at $Proxy73.assignSolution(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:146)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:68)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:339)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:317)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:810)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:238)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)
Caused by: com.sap.engine.services.applocking.exception.SAPAppLockingIllegalArgumentException: Inconsistency in number of primary keys
at com.sap.engine.services.applocking.TableLockingImpl.getArgument(TableLockingImpl.java:385)
at com.sap.engine.services.applocking.TableLockingImpl.lock(TableLockingImpl.java:128)
at com.sap.engine.services.applocking.TableLockingImpl.lock(TableLockingImpl.java:138)
at com.sap.engine.services.ejb.entity.pm.lock.TableLockingSystem.write(TableLockingSystem.java:82)
at com.sap.engine.services.ejb.entity.pm.PersistentM2M.create(PersistentM2M.java:172)
at com.sap.engine.services.ejb.entity.pm.PersistentCacheM2M.add(PersistentCacheM2M.java:197)
at com.sap.engine.services.ejb.entity.pm.multiple.CollectionM2M.add(CollectionM2M.java:57)
at com.atosorigin.tcc.testing.ejbses.profiling.ProfilerBean.assignSolution(ProfilerBean.java:201)
at com.atosorigin.tcc.testing.ejbses.profiling.ProfilerObjectImpl0.assignSolution(ProfilerObjectImpl0.java:771)
... 32 more
I can't figure out what the problem is with the ORM mapping defined.
On the database level I have three tables. Consultant maps to PFL_CONSULTANT, Solution to PFL_SAPSOLUTIONS. The third table PFL_CONS_SOL_MAP is the help table used for the relationship (having two fields, which are in fact foreign keys from the other two tables to express the assignment of solutions to consultants (where a consultant can have one or more solutions).
ps. : I am running Netweaver Developer Workplace (Netweaver 2004, at stack level 5)
Message was edited by: Theo PaesenHm, after disabling 'automatic locking' it works.
-
[ADF] Adding/deleting entries in a many-to-many relationship
I am using JDeveloper 10.1.3 and the ADF BC / ADF Model / ADF Faces / JSF technology stack.
For this question, I am using the SRDemo application as an example, specifically the many-to-many relationship between USERS and PRODUCTS (the Staff Expertise relationship), outlined in red in this schema diagram: Image Link
Users may have any number of product expertise areas and many users may have the same product expertise area. For the purposes of this example I have added two reference fields from the PRODUCT table into the ExpertiseAreas VO (Name and Description), outlined in red in this data control palette section: Image Link
I have created a page which shows the details of a user (1), along with a table showing the expertise areas the user has (3), and a table of all the products available (2), numbered on this design page: Image Link and corresponding to the numbered data controls on this data control palette section: Image Link, where 1 is rendered as an ADF Read-only Form, 2 is an ADF Read-only Table with a tableSelectMany element in the selection facet, and 3 is also an ADF Read-only Table.
What I am trying to do is have the tableSelectMany element reflect which of the products are linked to the current user in the expertise areas relationship (by having the checkbox for currently linked products checked), and when you check or uncheck a product's checkbox, it should add or remove the row in the EXPERTISE_AREAS intersection table, respectively (asume for this example that there are default values for Expertise Level and Notes).
So far I have been following the process used in section 19.8 of the ADF Developer's Guide for Forms/4GL Developers, which describes how to set up a selectManyShuttle which implements the adding and deleting functionality. So I have a Client Interface method in the Application Module, updateSkillsForCurrentStaff (described in section 10.6.7.2), and I have a selection listener for the assignment table in the backing bean for the page, which calls the updateSkillsForCurrentStaff method:
public void selectionChanged(SelectionEvent event)
BindingContainer bc = getBindings();
DCIteratorBinding productsIB = (DCIteratorBinding)bc.get("ProductListIterator");
Set keys = getTable1().getSelectionState().getKeySet();
Iterator iter = keys.iterator();
List productIds = new Vector();
while (iter.hasNext())
String product = ((Key)iter.next()).toStringFormat(true);
productsIB.setCurrentRowWithKey(product);
ViewRowImpl productRow = (ViewRowImpl)productsIB.getCurrentRow();
Number productId = (Number)productRow.getAttribute("Id");
productIds.add(productId);
OperationBinding ob = bc.getOperationBinding("updateSkillsForCurrentStaff");
Map pm = ob.getParamsMap();
pm.put("productIds", productIds);
ob.execute();
All of this works, but I can't work out how to link the selection state of the assignment table to the expertise areas that are linked to the user. Also I think the method listing above must be a bit of a hack, but I don't know enough about this to know if there's an easier way of doing it.
Any help is appreciated.Have a look at this example I cooked up for you.
http://radio.weblogs.com/0118231/2006/10/03.html#a739
It might not be the first way one thinks to implement something, but it illustrates a very interesting, model-centric approach to the problem you propose.
My feelings won't be hurt if you prefer a more view-centric approach, but I wanted to illustrate what was a maximally-model-centric solution (in fact, which doesn't even require a backing bean!) If you like a more view-centric approach, I can help you figure out what's wrong with your key-handling above. For one, I would probably start by passing the Set of Key's directly to the middle tier application module method to eliminate client-side code.
Check it out and let me know what you think. Try it directly in the Business Components Tester to appreciate one of the benefits a model-centric solution can bring. -
Working with many-to-many relationships
I am about to start my first experience with many-to-many
relationships using PHP and MySQL.
My project is to create an events registration form. As you
know, there can be many events and many participants attending many
events.
I am not sure on how to structure my database and tables so I
will first show you what I have:
create table programs (
program_id int not null primary key auto_increment,
program_name varchar(100) not null,
program_date varchar(25) not null,
program_time varchar(25) not null,
program_coordinator varchar(100),
program_seats int not null
create table participants (
participant_id int not null primary key auto_increment,
participant_name varchar(100) not null,
participant_phone varchar(12) not null
I know that I need a middle table to join the two.
create table programs_participants (
program_id int references program(id),
participants_id int references participants(id),
primary key (program_id, participants_id)
My problem is, how do I submit to both the participants AND
the programs_participants table together? Or is this not possible?
The participants are not already in the database when we register
them. We enter their personal info and select their desired events
from checkboxes on the same page.
Thanks for your help.> My problem is, how do I submit to both the participants
AND the
> programs_participants table together? Or is this not
possible? The
> participants are not already in the database when we
register them. We
> enter
> their personal info and select their desired events from
checkboxes on the
> same
> page.
What you need to do is a multi-step insert.
First, you insert the new participant into the participant
table, then use
the @@identity command to get the uniqueID of that newly
entered record.
Then you can take that uniqueID to build the entry for the
programs_participants table.
If you use a stored procedure, you should be able to do all
of that with
only having to create one call to the DB from your
Application.
_Darrel -
Seek good method for deleting many to many relationship
My question is as follows:
The relationship of Employee and Project is many to many. I set privately owned for employee-project relationship at toplink builder.
Employee class has a vector of valueholder attribute of Project list.
I write a function to remove a project relationship from Employee when his is no longer responsible for it.
public void removeProjectFromEmployee(String employeeId, String projectId)
throws Exception
DataSource src = this.getSource();
Employee emp = getEmployeeById(employeeId);
if (emp == null) {
throw new Exception("employee with id " + employeeId + " does not exist.");
else {
Vector projectVector = emp.getProjects();
for (int i=0; i<projectVector.size(); i++){
Project p=(Project)projectVector.elementAt(i);
if ((p.getProjId()).equals(projectId)) {
projectVector.removeElementAt(i);
emp.setProjects(projectVector);
src.registerObject(emp);
src.commit();
In here, i select the object of the employee and then remove one particular project from the vector. It is working but seemed to be quite stupid. Moreover, i worry about its performance when there are thousands of projects owned by an employee.
I think it is a very common operation but i am not very familiar with TOPLink at this moment. Could anyone please advise the correct and better way to deal with this situation?
ThanksHello,
Try registering your employee in the UnitOfWork before you re-set the collection onto it. This should resolve your problem.
Note: When you set the collection on the unregistered Employee object, you were modifying a shared, read-only instance of the object, and hence were making transactional changes visible to other threads non-atomically. There are a lot of good reasons why this is a bad thing.
I hope this helps,
Christian -
I have started developing a small application in WPF. Since I am completely new to it, to start with I took a microsoft's sample available at
Microsoft Sample Application and following the pattern of the sampke I have been so far successful in creating four different views for their corresponding
master tables. Unfortunately, I have got stuck up as the sample does not contain pattern for creating ViewModel when there is a many-to-many relationship in the database. In my application, I have the following data structure:
1. Table Advocate(advId, Name)
2. Table Party (partyId, Name)
3 Table Case (caseId, CaseNo)
4. Link Table Petitioner (CaseId, PartyId)
5. Link Table Respondent (CaseId, PartyId)
6. Link Table EngagedAdvocate(CaseId, advId)
7. Link Table EngagedSrAdvocate(CaseId, advId)
In the scenario above, I am a bit confused about how to go forward creating the required ViewModel which would render me to have multiple instances of Petitioners, Respondents, Advocates and SrAdvocates.
Please explain details in step by step manner considering that whatever work I have completed so far is a replica of Microsoft's sample referred above. I would also like to mention that I have developed my application
using VB.net. So please provide solution in vb.net.
After getting many-to-many relationship introduced into my application, it would achieve one level above the sample application and I would like to share with the community so that it could be helpful to many aspiring developers seeking help with MVVM.Hi ArunKhatri,
I would suggest you referring to Magnus's article, it provides an example of how you could display and let the user edit many-to-many relational data from the Entity Framework in a dynamic and data-bound DataGrid control in WPF:
http://social.technet.microsoft.com/wiki/contents/articles/20719.wpf-displaying-and-editing-many-to-many-relational-data-in-a-datagrid.aspx
You can learn how to design the ViewModel and the relationship between the entities.
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.
Maybe you are looking for
-
Warning/Error on generating Infoset in SQ02
I have a datasource in BI based on an infoset. upon generating the infoset it gives me the following warnings - however it seems like because of these warnings, I am unable to replicate the datasource in D17. this is the warning that I receive: Compa
-
Can anyone share their httpd.conf settings, that are optimized for a fairly high traffic site. It would be great if you could, as I am tuning and setting up Apache for the first time. Thanks
-
How to get BI role in portal 2004s
is there any delevered roles of BI/IP in portal 2004s ? do we have to download Business Package from SAP site to get more roles as we do not see any delivered roles for BI and IP in user admin of portal
-
hi how to debug the progrom which is running in the background. could anybody explain this with steps. thanx rocky
-
How to change this code to drag and drop image/icon into it??
Dear Friends: I have following code is for drag/drop label, But I need to change to drag and drop image/icon into it. [1]. code 1: package swing.dnd; import java.awt.*; import javax.swing.*; public class TestDragComponent extends JFrame { public