Hi,
I have a very simple EJB deployed to jboss 3.2.6 + postgresql 8 + java 1.4.2_06
+ suse linux 9.2
I use the following code to make a list:
| HashMap[] certificazioneArray = new HashMap[certificazioni.size()];
| Iterator iCertificazioni = certificazioni.iterator();
| int idx=0;
| while(iCertificazioni.hasNext())
| {
| CertificazioneLocal cert =
(CertificazioneLocal)iCertificazioni.next();
|
| HashMap certBean = new HashMap();
|
| certBean.put("id",cert.getId());
| certBean.put("chiusa",cert.getChiusa());
| certBean.put("simulazione",cert.getSimulazione());
| certBean.put("numeroRomano",cert.getNumeroRomano());
| certBean.put("data",cert.getData());
|
| certificazioneArray[idx++]=certBean;
| }
|
|
Problem is that for each get method jBoss fires a query to the database.
Using the documentation, I have tried to optimize the sql using load groups
(from my jbosscmp-jdbc):
| <entity>
| <ejb-name>Certificazione</ejb-name>
|
| <read-ahead>
| <strategy>on-find</strategy>
| <page-size>1000</page-size>
| <eager-load-group>lista</eager-load-group>
| </read-ahead>
|
| <table-name>certificazione</table-name>
|
| <load-groups>
| <load-group>
| <load-group-name>lista</load-group-name>
| <field-name>chiusa</field-name>
| <field-name>simulazione</field-name>
| <field-name>numeroRomano</field-name>
| <field-name>data</field-name>
| </load-group>
| </load-groups>
|
| <query>
| <query-method>
| <method-name>findAll</method-name>
| <method-params></method-params>
| </query-method>
| <jboss-ql>select object(o) from Certificazione as o order by
o.numero</jboss-ql>
| </query>
| </entity>
|
Nothing seams to change and five queries are still fired.
If I change the <commit-option> in jboss.xml to A, jboss fires only on sql
statement to the database but apparently speed speed is much more better.
The code I am using for making the list is not into a transaction.
What's wrong ? Where can I find more documentation on these issues ?
Thank you.
Fabrizio
>From my ejb-jar:
| <entity>
| <description>Entity Bean ( CMP )</description>
| <display-name>Certificazione</display-name>
| <ejb-name>Certificazione</ejb-name>
| <local-home>my.ejb.CertificazioneLocalHome</local-home>
| <local>my.ejb.CertificazioneLocal</local>
| <ejb-class>my.ejb.CertificazioneBean</ejb-class>
| <persistence-type>Container</persistence-type>
| <prim-key-class>java.lang.Long</prim-key-class>
| <reentrant>False</reentrant>
| <cmp-version>2.x</cmp-version>
| <abstract-schema-name>Certificazione</abstract-schema-name>
| <cmp-field>
| <field-name>id</field-name>
| </cmp-field>
| <cmp-field>
| <field-name>numero</field-name>
| </cmp-field>
| <cmp-field>
| <field-name>data</field-name>
| </cmp-field>
| <cmp-field>
| <field-name>simulazione</field-name>
| </cmp-field>
| <cmp-field>
| <field-name>chiusa</field-name>
| </cmp-field>
| <cmp-field>
| <field-name>numeroRomano</field-name>
| </cmp-field>
| <primkey-field>id</primkey-field>
| <query>
| <query-method>
| <method-name>findAll</method-name>
| <method-params/>
| </query-method>
| <ejb-ql>select object(o) from Certificazione o</ejb-ql>
| </query>
| </entity>
|
| ......
|
| <container-transaction>
| <method>
| <ejb-name>Certificazione</ejb-name>
| <method-name>*</method-name>
| </method>
| <trans-attribute>Required</trans-attribute>
| </container-transaction>
|
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