One-to-many self relationship guide

Using the TopLink Mapping Workbench within JDeveloper 9.0.5.2, I am trying to create a hierarchical query. I have a table that includes the following columns:
OBJECTID
PARENT_ID
where OBJECTID is the primary key, and PARENT_ID is a foreign key to OBJECTID. The CONNECT BY clause I would like to generate is:
CONNECT BY PRIOR PARENT_ID = OBJECTID
I have tried to use the tutorial at http://download-west.oracle.com/docs/cd/B10464_01/web.904/b10316/tutorial.htm#652452, but the TopLink Mapping Workbench GUIs in JDeveloper 9.5.0.2 are not the same as those shown in the tutorial. In particular, I cannot add a table reference in the one-to-many mapping GUI. I can only choose from existing foreign keys.
Has anyone found a way to create a one-to-many self relationship, using JDeveloper 9.5.0.2?
Thank you.

As far as I can tell you are right that the Add button on the Table Reference is not available on the Mapping Workbench in JDeveloper 9.0.5. It is available only on the standalone version of the Mapping Workbench.
The solution is to have the Table Reference (FK -> PK) Constraints already available from the Database. So all you need is to pick from an available relationship.
From JDEV log into the HR / HR Schema and map the EMPLOYEES table. That table has such a Constraint.

Similar Messages

Weblogic-cmp-rdbms-jar.xml for One-To-Many unidirectional relationship

hi,
I am trying to create a simple cmp One-To-Many unidirectional relationship and deploy the same in weblogic. Can someone help me with the weblogic-cmp-rdbms-jar.xml. Am attaching the weblogic-cmp-rdbms-jar. xml tht i am using as also the corresponding ejb-jar.xml. Pls. note tht i want a unidirectional relationship here. one i am tryng However i get this error:
Error while reading 'META-INF/weblogic-cmp-rdbms-jar.xml'. The error was: Role 'Supplier supplies Products' of relationship 'Product Supplier' contains an invalid key-column value of 'productID'. The key-column must specify a primary key column in the related bean. However, there is no primary key column named 'productID' defined in the related bean 'ProductEJB' or else 'productID' is not being recognized due to case mismatch. My weblogic-cmp-rdbms-jar
<?xml version="1.0"?>
<!DOCTYPE weblogic-rdbms-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB RDBMS Persistence//EN' 'http://www.bea.com/servers/wls810/dtd/weblogic-rdbms-jar.dtd'>
<weblogic-rdbms-jar>
<weblogic-rdbms-bean>
     <ejb-name>SupplierEJB</ejb-name>
     <data-source-name>RJDataSource</data-source-name>
     <table-map>
           <table-name>AA_Supplier</table-name>
           <field-map>
                 <cmp-field>supplierID</cmp-field>
                 <dbms-column>supplierID</dbms-column>
           </field-map>
           <field-map>
                <cmp-field>name</cmp-field>
                <dbms-column>name</dbms-column>
           </field-map>
     </table-map>
</weblogic-rdbms-bean>
<weblogic-rdbms-bean>
     <ejb-name>ProductEJB</ejb-name>
     <data-source-name>RJDataSource</data-source-name>
     <table-map>
           <table-name>AA_Product</table-name>
           <field-map>
                <cmp-field>productID</cmp-field>
                <dbms-column>productid</dbms-column>
           </field-map>
           <field-map>
                <cmp-field>description</cmp-field>
                <dbms-column>description</dbms-column>
           </field-map>
           <field-map>
                <cmp-field>basePrice</cmp-field>
                <dbms-column>baseprice</dbms-column>
           </field-map>
          <field-map>
                <cmp-field>name</cmp-field>
                <dbms-column>name</dbms-column>
           </field-map>
           <field-map>
                 <cmp-field>supplierID</cmp-field>
                   <dbms-column>supplierID</dbms-column>
           </field-map>
      </table-map>
</weblogic-rdbms-bean>
<weblogic-rdbms-relation>
     <relation-name>Product Supplier</relation-name>
     <weblogic-relationship-role>
          <relationship-role-name>Supplier supplies Products</relationship-role-name>
          <relationship-role-map>
               <column-map>
                    <foreign-key-column>supplierID</foreign-key-column>
                    <key-column>productID</key-column>
               </column-map>
          </relationship-role-map>
     </weblogic-relationship-role>
     <weblogic-relationship-role>
          <relationship-role-name>Product supplied by Supplier</relationship-role-name>
          <relationship-role-map>
          <column-map>
               <foreign-key-column>products</foreign-key-column>
               <key-column>supplierID</key-column>
          </column-map>
          </relationship-role-map>
     </weblogic-relationship-role>
</weblogic-rdbms-relation>
</weblogic-rdbms-jar> My ejb-jar.xml
<?xml version="1.0"?>
<!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>
     <enterprise-beans>
     <entity>
          <ejb-name>SupplierEJB</ejb-name>
          <home>com.tpt.practice.entityBeans.cmp.product.relationship.SupplierHome</home>
          <remote>com.tpt.practice.entityBeans.cmp.product.relationship.Supplier</remote>
          <ejb-class>com.tpt.practice.entityBeans.cmp.product.relationship.SupplierEJB</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>AA_Supplier</abstract-schema-name>
          <cmp-field>
               <field-name>supplierID</field-name>
          </cmp-field>
          <cmp-field>
               <field-name>name</field-name>
          </cmp-field>
          <primkey-field>supplierID</primkey-field>
          <ejb-ref>
                    <ejb-ref-name>ProducEJB</ejb-ref-name>
                    <ejb-ref-type>Entity</ejb-ref-type>
                    <home>com.tpt.practice.entityBeans.cmp.product.ProductHome</home>
                    <remote>com.tpt.practice.entityBeans.cmp.product.Product</remote>
                    <ejb-link>ProductEJB#ProductEJB.jar</ejb-link>
          </ejb-ref>
          <query>
               <query-method>
                    <method-name>findByName</method-name>
                    <method-params>
                         <method-param>java.lang.String</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Supplier AS a WHERE a.name =
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findAllSuppliers</method-name>
                    <method-params>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Supplier AS a WHERE a.supplierID
                    IS NOT NULL]]>
               </ejb-ql>
          </query>
     </entity>
     <entity>
          <ejb-name>ProductEJB</ejb-name>
          <home>com.tpt.practice.entityBeans.cmp.product.relationship.ProductHome</home>
          <remote>com.tpt.practice.entityBeans.cmp.product.relationship.Product</remote>
          <local-home>com.tpt.practice.entityBeans.cmp.product.relationship.ProductLocalHome</local-home>
          <local>com.tpt.practice.entityBeans.cmp.product.relationship.ProductLocal</local>
          <ejb-class>com.tpt.practice.entityBeans.cmp.product.relationship.ProductEJB</ejb-class>
          <persistence-type>Container</persistence-type>
          <prim-key-class>com.tpt.practice.entityBeans.cmp.product.relationship.ProductPK</prim-key-class>
          <reentrant>False</reentrant>
          <cmp-version>2.x</cmp-version>
          <abstract-schema-name>AA_Product</abstract-schema-name>
          <cmp-field>
               <field-name>productID</field-name>
          </cmp-field>
          <cmp-field>
               <field-name>name</field-name>
          </cmp-field>
          <cmp-field>
               <field-name>description</field-name>
          </cmp-field>
          <cmp-field>
               <field-name>basePrice</field-name>
          </cmp-field>
          <cmp-field>
               <field-name>supplierID</field-name>
          </cmp-field>
          <primkey-field>productID</primkey-field>
          <query>
               <query-method>
                    <method-name>findByName</method-name>
                    <method-params>
                         <method-param>java.lang.String</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.name =
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findByDescription</method-name>
                    <method-params>
                         <method-param>java.lang.String</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.description
                    = ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findByBasePrice</method-name>
                    <method-params>
                         <method-param>double</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice =
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findExpensiveProducts</method-name>
                    <method-params>
                         <method-param>double</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice >
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findCheapProducts</method-name>
                    <method-params>
                         <method-param>double</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice <
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findAllProducts</method-name>
                    <method-params>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.productID
                    IS NOT NULL]]>
               </ejb-ql>
          </query>
     </entity>
     </enterprise-beans>
     <relationships>
     <ejb-relation>
          <ejb-relation-name>Product Supplier</ejb-relation-name>
          <ejb-relationship-role>
               <ejb-relationship-role-name>Supplier supplies Products</ejb-relationship-role-name>
               <multiplicity>One</multiplicity>
               <relationship-role-source>
                    <ejb-name>SupplierEJB</ejb-name>
               </relationship-role-source>
               <cmr-field>
                    <cmr-field-name>products</cmr-field-name>
                    <cmr-field-type>java.util.Collection</cmr-field-type>
               </cmr-field>
          </ejb-relationship-role>
          <ejb-relationship-role>
               <ejb-relationship-role-name>Product supplied by Supplier</ejb-relationship-role-name>
               <multiplicity>Many</multiplicity>
               <relationship-role-source>
                    <ejb-name>ProductEJB</ejb-name>
               </relationship-role-source>
          </ejb-relationship-role>
     </ejb-relation>
     </relationships>
     <assembly-descriptor>
          <container-transaction>
          <method>
               <ejb-name>SupplierEJB</ejb-name>
               <method-intf>Remote</method-intf>
               <method-name>*</method-name>
          </method>
          <trans-attribute>Required</trans-attribute>
          </container-transaction>
     </assembly-descriptor>
</ejb-jar>

I think u r some confusion with productID and SuppliedID . primary key of one column( productId ) can be a foreign key of other table colum( SuppliedID). but foreign key( SuppliedID) can not be a primary key of second table .u declared SuppliedId as primary key . so ur mapping is incorrect.

One-to-many biderectional relationship

Hello, I am trying to create a one-to-many biderectional relationship between NewsengContent(1) and NewsengProperty(many) entities.
Inside NewsengContent, I define a collection of NewsengProperty's as:
@OneToMany(cascade = CascadeType.ALL, mappedBy = "contentId", fetch=FetchType.EAGER)
private Collection<NewsengProperty> newsengPropertyCollection;In NewsengProperty I define the contentId as FK to NewsengContent:
@ManyToOne
@JoinColumn(name = "content_id", referencedColumnName = "id")
private NewsengContent contentId;
    In the client code these are used as:
List<NewsengProperty> props = new ArrayList<NewsengProperty>();
NewsengContent nc = new NewsengContent();
nc.setNewsengPropertyCollection(properties);Eventually all data gets populated fine except that content_id column always comes out null.
Could anyone help me with this?
Thanks!

the problem was that I had to add following code to client:
for (NewsengProperty np: properties ) {
            np.setContentId(nc);
        nc.setNewsengPropertyCollection(properties);

One to many values relationship

Hello Everyone ,
I am working on an exception management project. I am having some difficulty showing one to many relationship from multiple tables . I used listagg function and was able to use show the one to many relationship via a select query . However , as our application maybe housed on sql-sever , i was told to find a workaround without the oracle specific function. I ll explain the relationship between exceptions and its ids
Exception 100 has 5 ids which has 2 distinct entity types
EXCEPTION ID     ENTITY TYPE
100               1        SECURITY
100               2        SECURITY
100               3        SECURITY
100               4        BOND
100               5        BOND
The desired output is
Exception        Entity_type
100                  Security,Bond
I have tried to use the case condition in select
case
when
count(distinct link.entity_type_id) > 1
then
null ----------------- ( need to use something in select )
else
max(entity_type_def.name)
end
Is it possible to do the following
1) Use a subquery to get comma separated values ?
2) If option 1 is not possible, any function which can be used in both sql server and oracle ?

Trying to write a single piece of code to work on different platforms is a sure way to end up with lengthy, complicated and poorly performing code in a lot of cases.
You would be better having two versions of the code, one written for Oracle to utilize it's power to achieve the task and one written for SQL Server to utilize it's power to achieve the same.
PL/SQL and T-SQL are completely different languages, and whilst a lot of things are common amongst the SQL functionality, the more complex tasks tend to be better done using their own methods.
Could you write a single piece of SQL to work on both... yes, in this case I'm sure you could... but "should" you write a single piece of SQL to work on both is probably a better question to ask.

Using models for multiple one-to-many table relationships

Hi there!
I have a database with tables that have one-to-many relationships. They
are laid out with a standard join tables:
A     A_B     B     B_C     C
a_id     a_id     b_id     b_id     c_id
b_id     c_id
and has 1 A for n of B. In some cases, the B table also joins with
another table for yet more information.
My question: what technique should I use to organize a database of this
type into JATO Models?
I could create an AModel, for example, that would have a set of query
field descriptors for the information relevant from tables A and B. But
then how do I query table C when that information is necessary? Or,
more to the point, create information in C when a new entry in B is created.
Do the models use each other, or is that left up to the view bean (seems
incorrect for data isolation).
Any pointers appreciated,
Byron

Byron,
You can create a separate "modifying" model for each table and do
inserts/deletes/updates in a transaction across the tables with the
three models. That's really the easy part.
The somewhat more tedious part is the "join" models, but not hard to do.
You just have to decide what you need from the different tables and
quite possibly create multiple join models for different select scenarios.
So let's just run through a simple two table join model.
Create a SQL model. I usually name them based on the table joins. Let's
use a somewhat more real example:
table = customer
columns = custid, firstname, lastname, email
table = address
columns = addrid (seqid), custid (fk), type
('w'ork,'h'ome,'b'illing,'s'hipping,'o'ther), address1, address2, city,
state, zip
Suppose we want to select a customer and show a list of all his/her
addresses.
I would create a SQL model class (extending QueryModelBase of course)
called CustomerAddressJoinModel (this naming convention gets tough with
three or more tables, so you have to be creative).
In that model, I would create the fields just like any single table
model. You need only include the columns you need. Maybe you create one
join model that only has custid, lastname, firstname, type, city, zip.
OK, so we only cut out 2 columns, but you get the point. If you had a
table with lots of columns with data you rarely need to display and/or
update, then you can exclude them. Probably a slick way to exclude
dynamically, but this is straight forward.
Another join model could have all the columns of both tables.
So the trick is to set the static where criteria (using the
setStaticWhereCriteria method) in the model's constructor. I think the
sql model template has this in it.
setStaticWhereCriteria(customer.custid=address.custid);
Now you just set your criteria like any other model, and execute it.
For a 3 table join, you just set the static criteria like this:
tableA.aid=tableB.aid AND tableB.bid=tableC.bid
does that make sense?
You can also set the "modifying table" (setModifyingTable(table) - i
think that's right) in the model and inserts/updates/deletes will only
operate on that table within the model. Problem is maybe in the the
field binding in your views. You may want to select from one field, and
modify using another field. Can be done though, just not directly supported.
In the next release of JATO, you will be able to set a display fields
binding for read and write using different fields and even different models.
craig
Byron Servies wrote:
Hi there!
I have a database with tables that have one-to-many relationships. They
are laid out with a standard join tables:
     A     A_B     B     B_C     C
     a_id     a_id     b_id     b_id     c_id
     b_id     c_id
and has 1 A for n of B. In some cases, the B table also joins with
another table for yet more information.
My question: what technique should I use to organize a database of this
type into JATO Models?
I could create an AModel, for example, that would have a set of query
field descriptors for the information relevant from tables A and B. But
then how do I query table C when that information is necessary? Or,
more to the point, create information in C when a new entry in B is created.
Do the models use each other, or is that left up to the view bean (seems
incorrect for data isolation).
Any pointers appreciated,
Byron
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp

One to Many Item relationship

What relationship type I can use to define 1 to many relationship? I want notifications to the user to replace item A with item B, C and D, when he gets an order for Item A.

Hi 1062454
There are multiple relationships between items like substitute, up-sell, cross-sell etc.
If you have defined the item relationships in Inventory and enabled the profile option 'OM: Enable Related Items' then in that case on the Quick Sales Order Form 'Related Items; button will be enabled.
This related items feature would allow you to select item B, C, D etc in place of Item A.
Thanks
Mirza Tanzeel

One to many circular relationship with CMP

Hello,
I cannot get to solve this problem. I hope someone in the community could help me with it.
I have an Entity Bean "Group", and I want to establish a 1:* relationship with other "Group" beans.
I try to accomplish it by using an attribute "members".
I have defined these two methods in Group:
public abstract Collection getMembers();
public void setMembers(Collection members);
But when I call setMembers from a Session Bean I get the following exception:
javax.ejb.TransactionRolledbackLocalException: Exception thrown fr
om bean; nested exception is: javax.ejb.EJBException: nested exception is: SQL Exception: Syntax error: Encountered "<EO
F>" at line 1, column 75.
Does anybody know where the problem could be?
Any tips would be really apreciated.
Thanks in advance

Hi,
Circular relationship are never supported by any server, an example would be
A has a relation with B, B has a relation with C, and C to A
Self relation means A has a relation with its own kind (A).
If a bean A has relation with B and B has relation with A, you dont call it circular its bidirectional relation.
Basically directionality depends how do you want to navigate your relations, viz., which bean needs to keep track of which bean.
Regards
Meka Toka
PS: And yeah, environment means, what server you are using, what OS, what version number etc etc.

One-to-many relationship within one bean

hello all,
Does S1 support a container managed one-to-many relationship to itself?
I used the verifer to verify my DD and the error is reported. (this prototype is migrated from weblogic6.1 and I use the S1 migration tool for the DD generation)
-----------------database schema-----------------
CREATE TABLE t_class_a
c_name VARCHAR2(255),
one_class_a_for_ma2918_id VARCHAR2(32), /* untruncated name: one_class_a_for_many_class_a_id */
object_id VARCHAR2(32) NOT NULL
CREATE UNIQUE INDEX t_class_a_id_PK ON t_class_a ( object_id );
ALTER TABLE t_class_a ADD ( CONSTRAINT t_class_a_id_PK PRIMARY KEY ( object_id ) USING INDEX );
ALTER TABLE t_class_a ADD ( CONSTRAINT FK_0 FOREIGN KEY ( one_class_a_for_ma2918_id ) REFERENCES t_class_a ( object_id ) );
---------------------------ejb-jar.xml------------------
<abstract-schema-name>ClassABean</abstract-schema-name>
<cmp-field>
<field-name>objectId</field-name></cmp-field>
<cmp-field>
<field-name>name</field-name></cmp-field>
<primkey-field>objectId</primkey-field>
<relationships>
<ejb-relation>
<ejb-relation-name>manyClassA_oneClassA</ejb-relation-name>
<ejb-relationship-role>
<description>optional</description>
<ejb-relationship-role-name>OneClassA-in-manyClassA_oneClassA</ejb-relationship-role-name>
<multiplicity>One</multiplicity>
<relationship-role-source>
<ejb-name>ClassAEJB</ejb-name></relationship-role-source>
<cmr-field>
<cmr-field-name>manyClassAsForOneClassA</cmr-field-name>
<cmr-field-type>java.util.Collection</cmr-field-type></cmr-field></ejb-relationship-role>
<ejb-relationship-role>
<description>optional</description>
<ejb-relationship-role-name>ManyClassA-in-manyClassA_oneClassA</ejb-relationship-role-name>
<multiplicity>Many</multiplicity>
<relationship-role-source>
<ejb-name>ClassAEJB</ejb-name></relationship-role-source>
<cmr-field>
<cmr-field-name>oneClassAForManyClassA</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
</ejb-relation>
</relationships>
-----------sun-cmp-mapping.xml--------
<sun-cmp-mapping>
<schema>mySchema</schema>
<entity-mapping>
<ejb-name>ClassAEJB</ejb-name>
<table-name>T_CLASS_A</table-name>
<cmp-field-mapping>
<field-name>objectId</field-name>
<column-name>OBJECT_ID</column-name></cmp-field-mapping>
<cmp-field-mapping>
<field-name>name</field-name>
<column-name>C_NAME</column-name></cmp-field-mapping>
<cmr-field-mapping>
<cmr-field-name>manyClassAsForOneClassA</cmr-field-name>
<column-pair>
<column-name>T_CLASS_A.OBJECT_ID</column-name>
<column-name>T_CLASS_A.ONE_CLASS_A_FOR_MA2918_ID</column-name></column-pair></cmr-field-mapping></entity-mapping></sun-cmp-mapping></sun-cmp-mappings>
I beleive the migration tool missing the cmr-filed mapping for the oneClassAForManyClassA relation role.
but even if I add this mapping it still can't pass the verifiy.
So do I miss any thing or I can conclude S1 not support this one-to many self relation?
Any hint would be welcome.

It does.
There is a known problem with parsing self-referenced relationship info - the one side (with <multiplicity> Many) must be the first in the <ejb-relation> entry.
Regards,
Marina

Unidirectional one-to-many relationship without a join table

Hello,
I have 2 classes, Invoice and InvoiceLine, and a one-to-many unidirectional relationship from Invoice to InvoiceLine. By default, with JPA, it would be mapped by a join table with foreign keys that refer to the 2 tables which represent Invoice and InvoiceLine.
My problem: the database has already a foreign key in the table which represents InvoiceLine that refers to the table which represents Invoice.
To solve my problem I could make the relationship bidirectional but I would like to know if it is possible to keep it unidirectional and to use the foreign key which already exists (in the table that represents InvoiceLine). How could I declare the mapping with JPA?
Thanks in avance for your answers.

JPA requires that any @OneToMany mapping not using a join table have an inverse @ManyToOne mapping. In general the foreign key in the target object needs to be mapped and a @ManyToOne mapping is normally the best way to map it, so making the relationship bi-directional is your best option.
There are other ways in TopLink to map a unidirectional 1-m, but these are not directly supported by the JPA spec. You could define a TopLink OneToManyMapping for the relationship through a TopLink DescriptorCustomizer and the code API. You would still need to map the foreign key in the target object some way, but you could use a @Basic mapping for this as long as you keep it in synch.
In TopLink you could also map the relationship using an AggregateCollectionMapping (basically a collection of embeddables), and then not require mapping the foreign key in the target, but this imposes limitations on the target object (must be treated like an embeddable instead of entity). You would also need to configure the target object to be an aggregateCollectionDescriptor if using this option.

ONE-to-MANY relationship between tables and forms in APEX

I recently started using APEX and I have run into an issue.
I have a ONE-TO-MANY relationship between two tables, A1 and A2, respectively.
A1:
A1_ID
Item
A2:
A2_ID
SubItem
A1_ID
I have 2 forms (lets call it F1 and F2) that I use to capture data for A1 and A2.
On F2, I have the following fields that are setup to capture data:
A2.A1_ID
**A1.Item (this is a drop down that is populated using a SELECT statement where the select uses A1.Item field)
A2.SubItem (user would enter SubItem)
Note: A2.A2_ID is populated using a SEQ
Everytime I pick **A1.Item on F2, is there a way to link to A1 table and display A1.A1_ID for every **A1.Item selected on F2?
If so, I want to store the value captured in F2 for the A1_ID field into A2 table to maintain my 1-to-MANY relationship.
If this will work, how do I go about implementing this solution?
Can someone help me?

I think it sounds like you are asking for a Master-Detail form. Try that and see what you get.
chris.

Urgent : java bean having bidirectional one to many relationship

Hi,
We have complex requirement in our application.
We need to copy java bean having bidirectional one to many relationship to another javabean having bidirectional one to many relationship..
E.g
Class Basket1 {
public String color;
pubic String type;
public List<Basket1> basketList = new ArrayList()
Class Basket2 {
public String color;
pubic String type;
public List<Basket2> basketList = new ArrayList()
We need to exact copy Basket1 to Basket2. We are in trouble to copy List of child because we do not have how many child Basket1 have of same type..
Can someone help us how we can implement such kind of complex object bidirectional one to many relationship??

I can't see anything bidirectional about these relationships. What I can see is a couple of BasketN classes that look identical so I don't know why they both exist, and they both contain lists of themselves as members, which suggests some kind of tree structure. Nothing bidirectional there. I can see tat these things can form circular object graphs but I don't see why you would want to do that.
We need to exact copy Basket1 to Basket2And I don't know what that means. Please explain.

How to insert data in a one-to-many relationship

How do you insert data into the client, my model entity beans have a one-to-many relationship.
PARENT ENTITY BEAN
PARENT-ID
PARENT-NAME
The ejbCreate(Integer parentID,String name)
CHILD ENTITY BEAN
CHILD-ID
CHILD-NAME
PARENT-ID(foreign key of PARENTID).
ejbCreate(Integer parentID,String name,String foreignparentID)
In a jsp page i collect the parent details and 3 corresponding chld details in a text box.
Can you please tell me how do i proceed from here...
ie. how to i insert data into the entity beans..
Do i pass the child as a collection, and within parents ejbCreate() method do i lookup for the childs home interface and insert one -by -one from the collection.
1. Considering the above example, can some one pls tell how the ejbCreate() mehod signatures, for the parent and child entity beans should be.
2. Pls also show some sample client code as to how to make an insertion.
3. In case you are passing a collection of child data, then in what format does one have to insert into a collection and also how does the container know how to insert the values in the child table , bcoz we are passing as a collection.
4.In case collections cannot be inserted do we need to iterate into the collection in parent's ejbCreate() method, and manually insert into the database of the childtable, thereby creating child entity beans.
Thanks for your time and support...
regards
kartik

Hi,
3. In this case of course child's ejbCreate(and postCreate) looks like
ejbCreate(Integer childID,String name,ParentLocal parent) {
setId(Id);
setName(name);
ejbPostCreate(Integer childID,String name,ParentLocal parent) {
setParent(parent);
Here you don't need IDs, but it happens only using Locals, not Remotes, if I'm not wrong. Container does it itself.
1. Of course, if you have parent.getChildren() and parent.setChildren() then you don't need any loops, but it should be done anyway in postCreate, because in ejbCreate there no parent exists yet.
Once more 3: example - I'm using JBoss 3.2.5 as EJB container. It has tomcat inside and EJB and JSP+Struts use the same jvm. It means for me that I don't need to use remote interfaces, just locals. And in this case I can implement ejb-relations. So, a have the abstract method parent.getChildren() which returns Collection of ChildLocal - s and method parent.setChildren(Collection childrenLocals) which creates/modifies children by itself.
I have not used remotes for a long time, but as I remember it was not possible to implement ejb-relations using remotes.
regards,
Gio

Struggling with a one to many relationship in a sub-report

Post Author: Scott_tansley
CA Forum: General
I have a database schema as per below: tblENQUIRY tblDatasheets tblReportParasIRSID (PK) 1 --> & IRSID (FK) UID (PK)Attribute1 SHEETID (PK) 1 > & SHEETID (FK)Attribute2 Attribute1 LIST_ORDER tblStandardParasAttribute3 Attribute2 PARA_CODE (FK) & < 1 CODE (PK)etc... Attribute3 TEXT etc...
The PROBLEM I am a Crystal Reports Newbie, and having to work through things bit by bitu2026 I've managed to achieve quite a lot, but I'm totally stuck with this and would appreciate some help. I need to create a report (essentially a letter and some datasheets) around a one-to-many relationship, which I have managed to compile using a main report (for the one [tblENQUIRY]) and sub report (for the many [tblDatasheets]). Essentially I need a covering letter, then the u2018manyu2019 datasheets, and then a number of other pages (which are largely static text). I have created a main report which includes the covering letter, holds a subreport for the datasheets, and then contains the text for the additional pages. This all works fine, and I get the correct number of datasheets for each main report. My problem stems from the use of this sub report. This sub-report needs to hold some attribute values for each datasheet, which is fine. However, on each datasheet page I need to have some paragraphs, which are held in another one to many relationship. Each datasheet may have up to six paragraphs held as a code in tblReportParas, with a relationship to the text as held in tblStandardParas. My original thought would have been to embed another sub report, containing the values from tblStandardParas!TEXT, into the first sub report. However, I have found that it is not possible to have a sub-report inside another sub-report. I had seperated the first sub-report out from the main report, and then embedded another sub-report into it. This worked fine until I tried to stitch the sub-report back into the main report (at which point the sub-sub-report dissapeared from view). I have therefore reworked my sub-report a little, and the attribution is now stored in a pageheader, with the tblStandardParas!TEXT in a detail section below it. This almost works! The only problem is that there is no relationship between the pageheader and detail sections. To clarify, I would expect to have one datasheet, with the attribution at the top, and then the six paras below. Then, the same on the next page (assuming there is a second datasheet) for that report. Instead, I get the correct attribution, but the detail section actually gives every paragraph in the database, no matter which datasheet/or report it related to! I therefore need to limit the detail section to only show those paragraphs where the SHEETID in tblReportParas is the same as the tblDatasheets SHEETID. Any offers of advice would be appreciated.

Post Author: Scott_tansley
CA Forum: General
I managed to resolve this myself in the end. I moves the tblEnquiry data into report header/footer sections, this allowed me to add the tblDatasheets information into the details section, which gave me multiple pages - and then finally, the Paragraphs were added through the use of a sub report.
There's probably an even better way, but for now it works, it's quick - and so I'm going to go with it!
Thanks for your interest.

How do I create a One to many relationship page in Dreamweaver?

How do I create a page in dreamweaver that comes up after the user logs in from the log in page that will allow the user to:
Add, change and delete in 2 tables that are in my MYSQL database that is a one to many relationship
One thing that is confusing is how the foreign key that links to the one side of the relationship is created in the many side without the user inputting the foreign key each time adding information to the many side table.
I am creating this in Dreamweaver using a MYSQL database and PHP.

>Would the following be a part of it:
>
>Outer join
Probably not. When updating/inserting/deleting from 2 tables you perform each seperately. Table updates may join two or more tables to resolve the correct row(s) but you still only update one table at a time. Procedurally you would create a transaction, update the first table, update the second table and then commit the transaction.
EDIT: Well I take back my last comment. I see that MySQL does seem to support multiple table updates. I don't use MySQL so I can't really help you on that but the MySQL manual gives pretty clear syntax.

SQL functions extract and XMLSequence for a one-to-many (1:N) relationship

I have have the following XML document loaded into a XMLType table. I'd like to retrieve the lineitem id together with the purchaseorder id and report id. How would the query look like? I've tried a lot but this one-to-many relationship is killing me.
Many thanks!
<report id=...>
<purchaseorder id=...>
<lineitems>
<lineitem id=...>...</lineitem>
<lineitem id=...>...</lineitem>
<lineitem id=...>...</lineitem>
</lineitems>
</purchaseorder>
<purchaseorder id=...>
<lineitems>
<lineitem id=...>...</lineitem>
</lineitems>
</purchaseorder>

You can easily modify the above query to your needs:
SQL> with qry as (
2 select t.column_value.extract('/report/@id') report_id,
3         t.column_value.extract('/report/purchaseorder') purchaseorder,
4         t.column_value.extract('/report/purchaseorder/lineitems/*') lineitems
5 from table(xmlsequence(xmltype('<document>
6                                    <chapter>
7                                      <report id="1">
8                                        <purchaseorder id="1">
9                                          <lineitems>
10                                            <lineitem id="1">Item 11</lineitem>
11                                            <lineitem id="2">Item 12</lineitem>
12                                            <lineitem id="3">Item 13</lineitem>
13                                          </lineitems>
14                                        </purchaseorder>
15                                        <purchaseorder id="2">
16                                          <lineitems>
17                                            <lineitem id="1">Item 21</lineitem>
18                                          </lineitems>
19                                        </purchaseorder>
20                                      </report>
21                                      <report id="2">
22                                        <purchaseorder id="1">
23                                          <lineitems>
24                                            <lineitem id="1">Item 31</lineitem>
25                                            <lineitem id="2">Item 32</lineitem>
26                                          </lineitems>
27                                        </purchaseorder>
28                                        <purchaseorder id="2">
29                                          <lineitems>
30                                            <lineitem id="1">Item 41</lineitem>
31                                            <lineitem id="2">Item 42</lineitem>
32                                          </lineitems>
33                                        </purchaseorder>
34                                      </report>
35                                    </chapter>
36                                  </document>'
37 ).extract('/document/chapter/*'))) t)
38 select q.report_id,
39         q1.column_value.extract('/purchaseorder/@id') purchase_id,
40         q2.column_value.extract('/lineitem/@id') lineitem_id,
41         q2.column_value.extract('/lineitem/text()') lineitem
42 from qry q,
43       table(xmlsequence(q.purchaseorder)) q1,
44       table(xmlsequence(q1.extract('/purchaseorder/lineitems/*'))) q2
45 /
REPORT_ID PURCHASE_ID     LINEITEM_ID     LINEITEM
1          1               1               Item 11
1          1               2               Item 12
1          1               3               Item 13
1          2               1               Item 21
2          1               1               Item 31
2          1               2               Item 32
2          2               1               Item 41
2          2               2               Item 42
8 rows selected.
SQL>

One-to-many self relationship guide

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