Adding a many-to-many relationship with AMO
Does anyone have an example of adding a many-to-many relationship using AMO that is NOT the AMOAdventureWorks example?
Specifically, I'm trying to do the following:
1. Create the new measure group (cube.MeasureGroups.Add("New MeasureGroup"). This will be the factless measure group that's used to resolve the many-to-many
2. Add a measure to it (something simple, like a Count)
3. Add a regular cube dimension to the measure group linking one side of the many-to-many to a normal dimension
4. Add a regular cube dimension to the measure group linking the other side of the many-to-many to a normal dimension
(3. and 4. above are "RegularMeasureGroupDimension" type)
5. Add a ManyToManyGroupDimension to the measure group. I use the ID of (3) above for its CubeDimensionID
This is where I get stuck. I get an error "Another 'MeasureGroupDimension' object has the 'Requesting BU Lookup' key." (and this is the name of the dimension that I added in step 3).
I could've sworn this worked just the other day! I can easily create these relationships using the GUI, but I just can't seem to get the AMO right to make it happen in code. Has anyone else been successful at this? I've stared a hole into AMOAdventureWorks, and it doesn't help :-(
(BTW: Scripting to XMLA is not an option, because of the restricted environment where cube customization needs to take place)
Dear John Lynn,
Would you be willing to share the sample of your code? I'm having some troubles myself and would find another sample than the AMOAdventureWorks
very helpful.
Thanks in advance.
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Many-to-One relationship with composed key
Hi all,
I have problems inserting an entity with a 1:n-relationship.
The relationship is defined over two columns. In detail:
There are two database-tables:
VERDECK
ID_PROJECT NUMBER (key)
ID_INTERN VARCHAR2(10 BYTE) (key)
UZSB
ID_PROJECT NUMBER (key)
ID_UZSB VARCHAR2(10 BYTE) (key)
ID_PROJECT_VERDECK NUMBER
ID_INTERN_VERDECK VARCHAR2(10 BYTE)
On UZSB there is a referential integrity defined between these tables:
FOREIGN KEY (ID_PROJECT_VERDECK, ID_INTERN_VERDECK)
REFERENCES R57SCHRAUB.VERDECK (ID_PROJECT,ID_INTERN))
This is mapped into JPA as follows:
@Entity
public class Verdeck implements Serializable {
@EmbeddedId
private VerdeckPK pk;
@OneToMany(cascade={CascadeType.ALL},mappedBy="verdeck")
private Collection<Uzsb> uzsbCollection;
@Embeddable
public class VerdeckPK implements Serializable {
@Column(name="ID_PROJECT")
private BigDecimal idProject;
@Column(name="ID_INTERN")
private String idIntern;
@Entity
public class Uzsb implements Serializable {
@EmbeddedId
private UzsbPK pk;
@ManyToOne
@JoinColumns({@JoinColumn(name="ID_PROJECT_VERDECK", referencedColumnName="ID_PROJECT"),@JoinColumn(name="ID_INTERN_VERDECK", referencedColumnName="ID_INTERN")})
private Verdeck verdeck;
@Embeddable
public class UzsbPK implements Serializable {
@Column(name="ID_UZSB")
private String idUzsb;
@Column(name="ID_PROJECT")
private BigDecimal idProject;
I try inserting a new entity VERDECK with some associated UZSBs as follows:
Verdeck einVerdeck = new Verdeck();
VerdeckPK myKey = new VerdeckPK();
myKey.setIdProject(idProject);
myKey.setIdIntern(lsId);
einVerdeck.setPk(myKey);
Uzsb lsUzsb = new Uzsb();
UzsbPK lsUzsbKey = new UzsbPK();
lsUzsbKey.setIdProject(idProject);
lsUzsbKey.setIdUzsb(lsId);
lsUzsb.setPk(lsUzsbKey);
lsUzsb.setVerdeck(einVerdeck);
Vector<Uzsb> uzsbColl = new Vector<Uzsb>();
uzsbColl.add(lsUzsb);
einVerdeck.setUzsbCollection(uzsbColl);
em.persist(einVerdeck);
As result I get the error
"ORA-02291: integrity constraint (R57SCHRAUB.SYS_C0022330) violated - parent key not found"
Does anybody have an idea? I think the problem could be the embedded key in Verdeck.
Perhaps I should take this into account in my JPA-definition of the relationship?
But how can I do this?
Regards,
ChristophHi Christoph,
our JPA implementation does not sort sqlstatements in the right order to work with foreign keys. This feature will come with the next release. The problem here is that databases check the constraint for every statement executed instead of checking at commit time (when our state is ok again).
As workaround you can set the settings for the foreign key constraints to deferred (pls. see oracle docu: alter table defferrable / alter session deffered) and the database will check at commit time. Second approach would be to delete the foreign key constraints.
hth
-Andreas -
I'm trying to implement a many-to-one relationship similar to the one, for example, between an OrderLineItem and a Product.
I managed to create the beans and define the relationship using deploytool.
What I'm trying to understand is how can I prevent a Product instance from being deleted when it is involved in the relationship described above?
Currently, under Sun's reference implementation server, I am allowed to delete a Product even if there are OrderLineItems that reference it.
There is one line printed out in the window running j2ee -verbose:
com.sun.ejb.containers.EntityContainer$EJBTxKey
The record in the Product table is deleted nonetheless.
Another weird thing is that the server does not allow me to deploy two beans involved in a many-to-one relationships with the Product bean if they are using the same CMR field name. What I get is a compilation error at the deployment time.
I'd appreciate any input.They way I handle this is to hide the creation/manipulation/deletion of the bean behind a manager - for example a singleton session bean. I NEVER allow the direct creation/deletion of entity beans except through manager classes. This is quite a common J2EE pattern, whose name escapes me at the moment.
Your manager would have a method like delete(int productId), which would delete the matching Product entity bean, and would then search the OrderLineItem beans for the matching Product primary key. -
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. -
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. -
Adding/removing many-to-many associations with intersection tables
Hello,
I am using Jdeveloper 11g with ADFBC.
I have some many to many associations in my application. For example User and Category are associated and there is an intersection entity (UserCategory - Columns are UserId, CategoryId) to save these associations.
What is the correct method for adding or removing categories assigned to user?
Thanks.
Edited by: Deniz Gulmez on 01-Nov-2009 03:25I found an example for Jdeveloper 10g, which is discussed [ADF] Adding/deleting entries in a many-to-many relationship
In that example, many-to-many association is defined as two 1-to-many associations. Actually i've been searching since last week for an example which is made with many-to-many associations but no help. I will change my Model structure if it is not an efficient way to define many-to-many associations with intersection tables.
I wonder if it is possible to write some methods like :
addCategoryToUser(String userId, String categoryId)
removeCategoryToUser(String userId, String categoryId)
addCategories(String userId, List categoryIds)
vs.
Of course i am able to do these by creating a new Row in UserCategoryView (Intersection view), setting it's attributes and saving. Or the opposite, finding the row in intersection table and deleting it.
For example:
public void removeCategoryFromUser(String userId, String categoryId){
ViewObjectImpl vo = this.getUserCategories1();
vo.setWhereClause("USER_ID = :userId AND CATEGORY_ID = :categoryId");
vo.defineNamedWhereClauseParam("userId", null, null);
vo.defineNamedWhereClauseParam("categoryId", null, null);
vo.setNamedWhereClauseParam("userId", userId);
vo.setNamedWhereClauseParam("categoryId", categoryId);
vo.executeQuery();
Row row = vo.first();
row.remove();
I wonder if there is a more efficient way. Any samples would be appreciated.
Edited by: Deniz Gulmez on 01-Nov-2009 05:49 -
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 -
Need example of adding attributes for many-to-many relationship
Hi,
Looking for examples of mappings and update code for many-to-many relationships with attributes.
There is a doc in Metalink:206971.1 that says that it can be done but no examples are shown.
Would realllly appreciate any help you can provide.
Cheers,
NimExtended Many to Many Question
Really there isn't any code to show. The recommendation is to create a class to represent the relationship. See link above for more details on the issue.
- Don -
Urgent: Many to many relationship with Objects
create type c1 as object (id varchar2(5),
descr varchar2(200))
create table c1_otab of c1(id primary key) object id primary key;
create type c2 as object (id varchar2(5), descr varchar2(200), cat1 ref c1)
I want a many to many relation between c1 and c2.
How do I create an object table of c2 having id,cat1.id as primary key?
ThanksMina,
As with relational tables, you can create a third table that has 1-n relationship with these two object tables. With 'cat1' as a REF attribute, an instance of c2 in c2_otab points to a c1 instance in c1_otab through the OID column. There is no need to explicitly create primary/foreign key. In fact, to prevent dangling REFs, the REF column should be declared as foreign key pointing to c1_otab.id (i.e. the primary key).
Regards,
Geoff
create type c1 as object (id varchar2(5),
descr varchar2(200))
create table c1_otab of c1(id primary key) object id primary key;
create type c2 as object (id varchar2(5), descr varchar2(200), cat1 ref c1)
I want a many to many relation between c1 and c2.
How do I create an object table of c2 having id,cat1.id as primary key?
Thanks -
Many-to-many relationship with value?
An Order has many Item, each Item can belong in many Order. This is a many-to-many relationship.
However, if the Item has a defaultPrice, and an Order can optionally override the price of an Item. How do I do that in ORM?
In SQL, I'd have a link table that has two FK's OrderID & ItemID as composit PK, and have an additional OverridePrice column.
How do I do that in ORM with only CFC annotation? if not, how about custom hibernate xml?
Thanks.I'd probably treat it more like a one to many between order and order_item, and a one to many between item and order_item, rather than trying to treat it purely as a many-to-many between order and item. In a many-to-many, the link table is purely that: a link table. It would not have significant data, whereas you have a requirement for such data.
That said, I reached this conclusion after only about 15sec of mulling it over, so there's likely to be other approaches too!
Adam -
QUESTION: HOW TO WRITE QUERY WITH MANY TO MANY RELATIONSHIPS
Could someone help me out here?
I was sitting here looking at some tables ie table_name and synonyms and wondering.
If a table can belong to many synonyms and a synonym can belong to many tables how would one write a query where I would like to know which tables belong to each synonym or on the other hand which synonym belongs to what tables?
Would I try to develop an outside join for this, a corrolated query or a query with a subquery or would there be another format that would work better?
What would be the best method of attack on this?
Thanks for your thoughts on this.
alActually, the relationship is not many to many. A table can have many synonyms, but a synonym within a namespace (i.e. a PUBLIC synonym, or a private synonym created by a user) can only point to one table. The xxx_synonmys tables already contain the information about the table_name and table_owner.
John -
Inserting with many to many relationship
db and dev 10g rel2 ,
hi all ,
an application for a laboratory ,( patients and tests)
i think the relation here is (many to many) , because each patient can have multiple tests, and each test can
have multiple patients .
what tables should i create ?
and finally i should have a block to insert data for patients , and it should have
the name of the patient and the test he is doing .
so what tables should i create , and the block for the data entry will be based on which table ? or tables ?
thanks a lotHi
First i do strongly recommend collecting reports & forms papers which r filled out by Mrs employees & patients then u stay to decide by ur pen & formalize what r the data required & what type of relationship need to be contracted from scratch off course many modifications Will occure by it Will be easier to modify on papers.
Then my guess is u.Will need tables for employees , Patients ,Labs & Analysis Types
Employees & Patients fields in a table r common in ;name, id,address,birthday or age ,
etc.
Labs table is needed if only u have many labs types ...
Analysis Types table is listing...
Analysis_id , Analysis_name& comments if any...
Actual_Analysis table which Will have many pk is from all previous tables e.g.
employees_id,Analysis_id, Patient_id,Lab no
,Analysis_date,Delivery_date,
Analysis time , Delivery or due time.
Status +-- A flag Which indicates ethe delivery status done or not
Deposit
way payment -- can have a table for it.
total cost
taxes
etc.
--========
All payments affairs could have a table or more for it
hope it.helps as a start.
Amatu Allah -
Dynamic List of record subsets with a Many-to-many relationship
I'm feeling pretty lost here and would appreciate any pointers.
I'm trying to use ADDT to create a dynamic list of records that includes a subset of comma separated list of many-to-many related records. Specifically I'm listing a bunch of workshops that have various teachers associated with each workshops. Teachers team teach a variety of workshops, thus the need for a many-to-many link table.
I've created a basic query to retrieve the workshop list, then another query to return the teacher's associated with the workshops. However I can't figure out how to use ADDT to list the teachers for each workshop.
I have a sense that it has something to do with a nested repeat region but there does not seem to be a way to get the wizard to see beyond the link table.
Am I way off here?
Thanks!Hi,
a list used in the singleSelectOne component does not change or set the currency in the list VO (in opposite to the navigation list). So this synchronization needs to be done programmatically. Examples of dependent list of values are available here
--> example 62 http://radio.weblogs.com/0118231/stories/2004/09/23/notYetDocumentedAdfSampleApplications.html
--> word document you can download from http://thepeninsulasedge.com/frank_nimphius/2008/05/16/blogbuster-treasures-hunt-blog-entries-from-the-lost-orablogs-blog-for-download/
Frank
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