EJB for complex query

Question

Hi,
I'm new in Enterprise javabeans, I have been looking for (almost five days) the
best way to get the result for a complex query. I tried with example Weblogic
BeanManaged. I put the query directly in a method in entityBean class with prepareStatament
and that worked.
But, I have to evaluate the best way to get result with EJB's. So, I think that
I have to evaluate others like containerManaged, in this case I have to define
each entity Bean and relationships and everything, isn't it?
Is there another way to develop it with good results? and fast?
If someone have any good idea to develop a solution with EJB's for this query.
I'm really appreciate it.
select CU.ID_CUENTA_USO, C.CLASE_CUENTA, C.ESTADO, P.ID_PRODUCTO, P.NOMBRE_PRODUCTO,
CU.ID_TIPO_PAGO, AOA.ID_AREA, AOA.NOMBRE_AREA, AOA.ID_TIPO_AOA, CU.ID_CLIENTE_USUARIO,
decode (PN.ID_PERSONA,null, decode (PJ.ID_PERSONA,null, PR.APELLIDOS || ' ' ||PR.NOMBRES,
PJ.NOMBRE_EMPRESA),PN.APELLIDOS || ' ' ||PN.NOMBRES)
from ATRIBUTOS A, CUENTA_USO CU, CUENTA C, PRODUCTO P,
AREA_OPERACIONES_ADM AOA, PERSONA_NATURAL PN, PERSONA_JURIDICA PJ, PERSONA_REPRESENTADO
PR
where A.ABREVT_ATRIB_CTA_USO = 'NRO_CELULAR'
and A.VALOR = '142000000'
and CU.ID_CUENTA_USO = A.ID_CUENTA_USO
and C.ID_CUENTA = CU.ID_CUENTA_USO
and P.ID_PRODUCTO = CU.ID_PRODUCTO
and AOA.ID_AREA(+) = CU. ID_AREA_ACTIVACION
and AOA.ID_TIPO_AOA(+) = CU.ID_TIPO_AREA_ACTIVACION
and PN.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
and PJ.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
and PR.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
order
by P.ID_PRODUCTO, CU.ID_CUENTA_USO;
Thank's in advanced
Yose

Answer 1

Hola/Hello Ryan
Muchas Gracias por tu respuesta/ Thank's a lot for your answer, I'm trying with
relationship-caching but something is missing.. because i got an error:
ejbc:
[java] [EJBCompiler] : Recompiling because no previous hashes found
[java] [EJBCompiler] : Compliance Checker said bean was compliant
[java]
[java]
[java]
[java] ERROR: Error from ejbc: While reading META-INF/weblogic-cmp-rdbms-jar.xml,
the Entity EJB's peristence layer failed to deploy. The error was:
[java] Error in descriptor line 44: Element type "relationship-caching"
must be declared.
[java]
[java]
[java] ERROR: ejbc found errors
I have two EJB Cuenta and Atributo I defined a relationship in the weblogic-cmp-rdbms-jar.
(I want to start with two entity and add later the others producto, cuenta, persona_x)
<relationship-caching>
     <caching-name>Cuenta-Atributo</caching-name>
     <caching-element>
          <cmr-field>cuenta</cmr-field>
          <group-name>cuentas_group</group-name>
          <caching-element>
               <cmr-field>atributos</cmr-field>
               <group-name>atrib_group</group-name>
          </caching-element>
     </caching-element>
</relationship-caching>
Where i have to defined it? Thanks a lot for your help..
Yosemarlyn
"Ryan LeCompte" <[email protected]> wrote:
>
Hola/Hello Yosemarlyn,
You can utilize EJB 2.0 CMP to model the query that you specified. You
would model
the business domain as CMP Entity beans and then specify the various
relationships
among them. You actually may get an increase in performance by utilizing
CMP/CMR
in WebLogic due to the new features such as relationship caching, optimistic
concurrency
strategy support, etc. Utilizing these features will drastically reduce
the number
of SQL Joins (and overall hits to the database, due to caching). Below
are various
links for learning more:
Mastering EJB II (Good book for learning about CMP/CMR):
http://www.theserverside.com/books/masteringEJB/index.jsp
Optimistic Concurrency:
http://dev2dev.bea.com/resourcelibrary/technicalguides/Optimistic_Concurrency.jsp
http://edocs.bea.com/wls/docs70/ejb/EJB_environment.html#1153757
Relationship caching:
http://edocs.bea.com/wls/docs70/ejb/EJB_environment.html#1151177
Espero que esto te sirva bien. :-)
Saludos,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Yosemarlyn Lopez" <[email protected]> wrote:
Hi,
I'm new in Enterprise javabeans, I have been looking for (almost five
days) the
best way to get the result for a complex query. I tried with example
Weblogic
BeanManaged. I put the query directly in a method in entityBean class
with prepareStatament
and that worked.
But, I have to evaluate the best way to get result with EJB's. So, I
think that
I have to evaluate others like containerManaged, in this case I have
to define
each entity Bean and relationships and everything, isn't it?
Is there another way to develop it with good results? and fast?
If someone have any good idea to develop a solution with EJB's for this
query.
I'm really appreciate it.
select CU.ID_CUENTA_USO, C.CLASE_CUENTA, C.ESTADO, P.ID_PRODUCTO, P.NOMBRE_PRODUCTO,
CU.ID_TIPO_PAGO, AOA.ID_AREA, AOA.NOMBRE_AREA, AOA.ID_TIPO_AOA, CU.ID_CLIENTE_USUARIO,
decode (PN.ID_PERSONA,null, decode (PJ.ID_PERSONA,null, PR.APELLIDOS
|| ' ' ||PR.NOMBRES,
PJ.NOMBRE_EMPRESA),PN.APELLIDOS || ' ' ||PN.NOMBRES)
from ATRIBUTOS A, CUENTA_USO CU, CUENTA C, PRODUCTO P,
AREA_OPERACIONES_ADM AOA, PERSONA_NATURAL PN, PERSONA_JURIDICA PJ, PERSONA_REPRESENTADO
PR
where A.ABREVT_ATRIB_CTA_USO = 'NRO_CELULAR'
and A.VALOR = '142000000'
and CU.ID_CUENTA_USO = A.ID_CUENTA_USO
and C.ID_CUENTA = CU.ID_CUENTA_USO
and P.ID_PRODUCTO = CU.ID_PRODUCTO
and AOA.ID_AREA(+) = CU. ID_AREA_ACTIVACION
and AOA.ID_TIPO_AOA(+) = CU.ID_TIPO_AREA_ACTIVACION
and PN.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
and PJ.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
and PR.ID_PERSONA(+) = CU.ID_CLIENTE_USUARIO
order
by P.ID_PRODUCTO, CU.ID_CUENTA_USO;
Thank's in advanced
Yose
[weblogic-cmp-rdbms-jar.xml]