RMI or plain JDBC???

I'm in the planning stages for an application that will be run on client machines via Java Web Start. These applications are going to need to have access to a MS SQL Server, located on a separate machine, and I'm wondering if I should use RMI for all my database connections, queries, updates, etc., or should I just use JWS to launch my application, and include the location of the JDBC drivers in the .jnlp file, and handle all database calls and such on the client end. There are of course benefits and drawbacks to both. I would tend to lean towards RMI as it offers more security, but I'm new to the concept of RMI, and am clueless as to how to implement it, being the app is on a client machine and it needs access to the server. Don't know how to do that, but I'm searching the forums and Google for other cases of people doing the same thing I am looking at, and seeing how they implemented it. I'm not trolling for free code, just looking for examples that will help me create my own way of doing it. So, should I use RMI, or does my situation not warrant it and I can go with straight JDBC calls to the database. Thanks for any advice...
James

Unless there is a firewall between your client and server machines, or you anticipate being able to make significant use of server-side cacheing, then go with JDBC.
If security is a really big deal (specifically you want to encrypt communications between clients & the server) then RMI offers some options that aren't available with JDBC, but an external solution such as IPSec is probably going to be easier to implement.
D.

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IAnywhere JDBC vs. jConnect 5.5 / RowSet Control Functionality

(First, I apologize for this enourmous post)
First, my specs:
I am using WebLogic Platform 8.1 SP4 on Windows 2000 Professional. I am using iAnywhere's (a Sybase company) Adaptive Server Anywhere 9.0.2 using jConnect 5.5 in one domain and iAnywhere JDBC driver in another.
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<May 3, 2005 12:09:47 PM EDT> <Warning> <RMI> <BEA-080003> <RuntimeException thr
own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getTableName
(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getTableName has not been completed and should not be ca
lled..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
bc2.tds.RowFormatToken.getTableName has not been completed and should not be cal
led.
at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getTableName(I)Ljava.lang.String;
(RowFormatToken.java:523)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getTableName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getTableName(I)Ljava
.lang.String;(ResultSetMetaDataImpl.java:132)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
server.RuntimeMethodDescriptor;Lweblogic.rmi.spi.InboundRequest;Lweblogic.rmi.sp
i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.se
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ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
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r.java:147)
at weblogic.rmi.internal.BasicServerRef.handleRequest(Lweblogic.rmi.spi.
InboundRequest;)V(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(Lweblogic.kernel.Ex
ecuteThread;)V(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest
;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
e)
>
<May 3, 2005 12:09:47 PM EDT> <Warning> <RMI> <BEA-080003> <RuntimeException thr
own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getCatalogNa
me(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getCatalogName has not been completed and should not be
called..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
bc2.tds.RowFormatToken.getCatalogName has not been completed and should not be c
alled.
at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getCatalogName(I)Ljava.lang.Strin
g;(RowFormatToken.java:540)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getCatalogName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getCatalogName(I)Lja
va.lang.String;(ResultSetMetaDataImpl.java:140)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
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i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.se
curity.subject.AbstractSubject;Ljava.security.PrivilegedExceptionAction;)Ljava.l
ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
ject;Ljava.security.PrivilegedExceptionAction;)Ljava.lang.Object;(SecurityManage
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InboundRequest;)V(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(Lweblogic.kernel.Ex
ecuteThread;)V(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest
;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
e)
>
<May 3, 2005 12:09:47 PM EDT> <Warning> <RMI> <BEA-080003> <RuntimeException thr
own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getSchemaNam
e(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getSchemaName has not been completed and should not be c
alled..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
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lled.
at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getSchemaName(I)Ljava.lang.String
;(RowFormatToken.java:499)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getSchemaName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getSchemaName(I)Ljav
a.lang.String;(ResultSetMetaDataImpl.java:108)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
server.RuntimeMethodDescriptor;Lweblogic.rmi.spi.InboundRequest;Lweblogic.rmi.sp
i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.se
curity.subject.AbstractSubject;Ljava.security.PrivilegedExceptionAction;)Ljava.l
ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
ject;Ljava.security.PrivilegedExceptionAction;)Ljava.lang.Object;(SecurityManage
r.java:147)
at weblogic.rmi.internal.BasicServerRef.handleRequest(Lweblogic.rmi.spi.
InboundRequest;)V(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(Lweblogic.kernel.Ex
ecuteThread;)V(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest
;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
e)
>
I have created the "stored procedures" in my database by running the sql_asa.sql script as directed by the jConnect 5.5 documentation. The weird thing though is that when I run my test browser, everything seems to be working despite the errors above. Are these errors something to be concerned about?
Now, with the iAnywhere JDBC driver, when I do the same thing, I get no errors on my console during the RowSet control creation, but when I run the application with the test browser and start navigating the JPF, I eventually get two errors in the browser itself:
When I click Insert (from the grid) and then click Cancel, my browser gives this error:
An error has occurred:
An exception occurred in the action begin
[Microsoft][ODBC Driver Manager] Invalid argument value
Afterwards, I click the Back button twice on the test browser and it gives this error:
An error has occurred:
An exception occurred in the action begin
[Sybase][ODBC Driver]Invalid cursor state
The Console reads like this:
<May 17, 2005 4:12:05 PM EDT> <Warning> <WLW> <000000> <Id=top-level; Method=con
trols.Newjcx11.getAllEmployee04(); Failure=java.sql.SQLException: [Microsoft][OD
BC Driver Manager] Invalid argument value [ServiceException]>
WARNING: The primary key map could not find a primary key parameter under the re
quest key "_autoscope__rowId".
<May 17, 2005 4:16:55 PM EDT> <Warning> <WLW> <000000> <Id=top-level; Method=con
trols.Newjcx11.getAllEmployee04(); Failure=java.sql.SQLException: [Sybase][ODBC
Driver]Invalid cursor state [ServiceException]>
In addition, using both drivers, I get similar errors on my console when I run the application and while I navigate the JPF:
<May 17, 2005 2:31:17 PM EDT> <Error> <WLW> <000000> <unknown database type foun
d. datbase name = Adaptive Server Anywhere, database driver name = jConnect (TM)
for JDBC (TM)>
(SAME ERROR ABOVE OUTPUTS WITH THE iAnywhere JDBC driver, the values are just different)
AND...
WARNING: The primary key map could not find a primary key parameter under the re
quest key "_autoscope__rowId".
Any feedback on this would be appreciated... I've done a lot of newsgroup searching and google'ing and really haven't found any help...
Anthony

Hi. I'm sorry to say the problem is that the RowSet implementation
assumes the driver has implemented all the JDBC 2.0 methods, and
the Sybase ASA driver hasn't so it blows chunks when we call them.
If you can use the ASE jconnect type-4 driver for ASA, maybe it will
work?
Joe
Anthony Mangione wrote:
(First, I apologize for this enourmous post)
First, my specs:
I am using WebLogic Platform 8.1 SP4 on Windows 2000 Professional. I am using iAnywhere's (a Sybase company) Adaptive Server Anywhere 9.0.2 using jConnect 5.5 in one domain and iAnywhere JDBC driver in another.
Second, my problem:
I am using WL Workshop 8.1 to create a RowSet control within a Web Project. I'm then creating a JPF from the RowSet control. I'm following directions from the documentation from the Rapid Application Development class that I took where it references "creating a CRUD application". I'm having different problems depending on the driver I'm using.
With jConnect: When I create the RowSet control, this outputs on my Admin Console:
<May 3, 2005 12:09:47 PM EDT> <Warning> <RMI> <BEA-080003> <RuntimeException thr
own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getTableName
(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getTableName has not been completed and should not be ca
lled..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
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at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getTableName(I)Ljava.lang.String;
(RowFormatToken.java:523)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getTableName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getTableName(I)Ljava
.lang.String;(ResultSetMetaDataImpl.java:132)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
server.RuntimeMethodDescriptor;Lweblogic.rmi.spi.InboundRequest;Lweblogic.rmi.sp
i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
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ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
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r.java:147)
at weblogic.rmi.internal.BasicServerRef.handleRequest(Lweblogic.rmi.spi.
InboundRequest;)V(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(Lweblogic.kernel.Ex
ecuteThread;)V(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest
;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
e)
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own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getCatalogNa
me(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getCatalogName has not been completed and should not be
called..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
bc2.tds.RowFormatToken.getCatalogName has not been completed and should not be c
alled.
at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getCatalogName(I)Ljava.lang.Strin
g;(RowFormatToken.java:540)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getCatalogName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getCatalogName(I)Lja
va.lang.String;(ResultSetMetaDataImpl.java:140)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
server.RuntimeMethodDescriptor;Lweblogic.rmi.spi.InboundRequest;Lweblogic.rmi.sp
i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.se
curity.subject.AbstractSubject;Ljava.security.PrivilegedExceptionAction;)Ljava.l
ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
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at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
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<May 3, 2005 12:09:47 PM EDT> <Warning> <RMI> <BEA-080003> <RuntimeException thr
own by rmi server: weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getSchemaNam
e(I)
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.j
dbc2.tds.RowFormatToken.getSchemaName has not been completed and should not be c
alled..
com.sybase.jdbc2.utils.UnimplementedOperationException: The method com.sybase.jd
bc2.tds.RowFormatToken.getSchemaName has not been completed and should not be ca
lled.
at com.sybase.jdbc2.jdbc.ErrorMessage.raiseRuntimeException(Ljava.lang.S
tring;[Ljava.lang.String;)V(ErrorMessage.java:773)
at com.sybase.jdbc2.utils.Debug.notImplemented(Ljava.lang.Object;Ljava.l
ang.String;)V(Debug.java:387)
at com.sybase.jdbc2.tds.RowFormatToken.getSchemaName(I)Ljava.lang.String
;(RowFormatToken.java:499)
at weblogic.jdbc.wrapper.ResultSetMetaData_com_sybase_jdbc2_tds_RowForma
tToken.getSchemaName(I)Ljava.lang.String;(Unknown Source)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl.getSchemaName(I)Ljav
a.lang.String;(ResultSetMetaDataImpl.java:108)
at weblogic.jdbc.rmi.internal.ResultSetMetaDataImpl_WLSkel.invoke(ILwebl
ogic.rmi.spi.InboundRequest;Lweblogic.rmi.spi.OutboundResponse;Ljava.lang.Object
;)Lweblogic.rmi.spi.OutboundResponse;(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(Lweblogic.rmi.extensions.
server.RuntimeMethodDescriptor;Lweblogic.rmi.spi.InboundRequest;Lweblogic.rmi.sp
i.OutboundResponse;)V(BasicServerRef.java:477)
at weblogic.rmi.internal.BasicServerRef$1.run()Ljava.lang.Object;(BasicS
erverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.se
curity.subject.AbstractSubject;Ljava.security.PrivilegedExceptionAction;)Ljava.l
ang.Object;(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.ac
l.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSub
ject;Ljava.security.PrivilegedExceptionAction;)Ljava.lang.Object;(SecurityManage
r.java:147)
at weblogic.rmi.internal.BasicServerRef.handleRequest(Lweblogic.rmi.spi.
InboundRequest;)V(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(Lweblogic.kernel.Ex
ecuteThread;)V(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest
;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Sourc
e)
I have created the "stored procedures" in my database by running the sql_asa.sql script as directed by the jConnect 5.5 documentation. The weird thing though is that when I run my test browser, everything seems to be working despite the errors above. Are these errors something to be concerned about?
Now, with the iAnywhere JDBC driver, when I do the same thing, I get no errors on my console during the RowSet control creation, but when I run the application with the test browser and start navigating the JPF, I eventually get two errors in the browser itself:
When I click Insert (from the grid) and then click Cancel, my browser gives this error:
An error has occurred:
An exception occurred in the action begin
[Microsoft][ODBC Driver Manager] Invalid argument value
Afterwards, I click the Back button twice on the test browser and it gives this error:
An error has occurred:
An exception occurred in the action begin
[Sybase][ODBC Driver]Invalid cursor state
The Console reads like this:
<May 17, 2005 4:12:05 PM EDT> <Warning> <WLW> <000000> <Id=top-level; Method=con
trols.Newjcx11.getAllEmployee04(); Failure=java.sql.SQLException: [Microsoft][OD
BC Driver Manager] Invalid argument value [ServiceException]>
WARNING: The primary key map could not find a primary key parameter under the re
quest key "_autoscope__rowId".
<May 17, 2005 4:16:55 PM EDT> <Warning> <WLW> <000000> <Id=top-level; Method=con
trols.Newjcx11.getAllEmployee04(); Failure=java.sql.SQLException: [Sybase][ODBC
Driver]Invalid cursor state [ServiceException]>
In addition, using both drivers, I get similar errors on my console when I run the application and while I navigate the JPF:
<May 17, 2005 2:31:17 PM EDT> <Error> <WLW> <000000> <unknown database type foun
d. datbase name = Adaptive Server Anywhere, database driver name = jConnect (TM)
for JDBC (TM)>
(SAME ERROR ABOVE OUTPUTS WITH THE iAnywhere JDBC driver, the values are just different)
AND...
WARNING: The primary key map could not find a primary key parameter under the re
quest key "_autoscope__rowId".
Any feedback on this would be appreciated... I've done a lot of newsgroup searching and google'ing and really haven't found any help...
Anthony

How to use the type 4 of DBF JDBC 2.0 Driver?

Hi,
I download the "DBF JDBC 2.0 Driver package" from http://memebers.tripod.com/~ZYH/jdbc.html and copy it into my classpath.
But I cannot find its Driver name string using in Class.forName(<DriverName>). And I also need the Connection String in Con.getConnection(<ConnectionString>).
It will be great appreciated if you can give me any information.
Thans a lot in advance!
Jane

Dear Jiehua Huang,
First, you need to download JDK1.2, 1.3 or 1.4 from www.javasoft.com if
you use DBF JDBC 2.0 package(DBF_JDBC20.jar). You can download JDK1.1.X
too if you use DBF JDBC 1.2 package(DBF_JDBC12.jar).
Secondly, please add DBF_JDBC20.jar (or DBF_JDBC12.jar) to your Java
class path, for instance, "SET
CLASSPATH=c:\javalib\DBF_JDBC2.0.jar;%classpath". You can also use "java
-classpath c:\javalib\dbf.jar yourDBFclass" to run your class. More
information about classpath, please read the "Setting the Classpath"
topic in file:///yourdriver|/jdk1.2/docs/tooldocs/tools.html . You can
use "java -classpath c:\javalib\DBF_JDBC20.jar yourDBFclass" or "java
-classpath c:\javalib\DBF_JDBC12.jar yourDBFclass" too.
Thirdly, you can use
'Class.forName("com.hxtt.sql.dbf.DBFDriver").newInstance();' or
Class.forName("com.hxtt.sql.dbf.DBFDriver");' to load this driver.
Fourth, if you have used other JDBC driver, you only need to know the
correct URL format for DriverManager.getConnection(url,"",""); You can
find the URL format from "testDBF.java". If you were a Java novice,
please read also other Java examples code in JDBC20demo.zip or
JDBC12demo.zip.
DBF URL format:
Direct Access:
jdbc:dbf:[/]/[DatabasePath] (You can omit that "//"
characters)
For example:
"jdbc:dbf:/."
"jdbc:dbf:/c:/dbffiles"
"jdbc:DBF:////usr/data" for unix or linux:
"jdbc:DBF:/./data"
Access by DBF Server: Skip it if you don't use RMI or JINI.
jdbc:DBF://hostname:port/[DatabasePath]
For example:
"jdbc:DBF://domain.com:3099/dbffiles" if
one DBFServer is run on the 3099 port of domain.com
Last, DBF driver is a standard JDBC driver so that you will find most of
valuable information at
file:///yourdrive|/jdk1.2/docs/api/java/sql/package-frame.html .
DBF supports SQL Minimum Grammar, which is a subset of the Entry level
syntax of SQL-92.
The major syntax is listed below:
CREATE TABLE base-table-name (column-identifier data-type
[,column-identifier data-type]...)
DROP TABLE base-table-name
DELETE FROM table-name [WHERE search-condition]
INSERT INTO table [ ( column [, ...] ) ] { VALUES ( expression [,
...] ) | SELECT query }
UPDATE table-name SET column-identifier = {expression | NULL }[,
column-identifier = {expression | NULL}]... [WHERE search-condition]
SELECT [ALL | DISTINCT ]select-list FROM table-reference-list
[WHERE search-condition] [group-by-clause] [order-by-clause]
CREATE [UNIQUE] INDEX indexName[(keylength)][,...] [OF
indexFileName] ON tableName (expression UNIQUE ASC
[FOR lExpression][,...])
DROP INDEX {ALL | indexName[,indexName2,...]} [of indexFileName]
ON table-name
REINDEX {ALL | indexFileName[,indexfiLEName2,...]} ON table-name
DBF driver will use index to speed up the query which contains some
index expressions. If a table has a structural .CDX or .IDX file, the
file is opened automatically when the table is opened. You have to run
the DBFIndex once to supply the necessary index file information for the
nonstructural index file which hasn't the same file name as its table
name and is created by other xbase applications. Then DBF will create a
special table.INDICES file and maintain the index files automatically.
You can use "java com.hxtt.sql.dbf.DBFIndex" to find out how to supply
existent index files. Useage: java com.hxtt.sql.dbf.DBFIndex
dbfTablePath tableName indexFileFullName1 [indexFileFullName2 ...]. For
instance, you have a legacy 'product.dbf' file with prodname.idx,
prodprice.idx and orderdate.idx on "c:\proudct\data" directory, you can
run "java com.hxtt.sql.dbf.DBFIndex c:\proudct\data product prodname.idx
prodprice.idx orderdate.idx" once. Then DBF will create a special
product.INDICES file and maintain the index files automatically. All
operations of update, insert and delete will update the .IDX files that
are related to the DBF file. DBF driver doesn't index all deleted records.
File name is case sensitive on unix OS. For unix or linux, DBF will try
to seek acquiescently dbf files with the suffixs like ".DBF" for the
first time, and ".dbf" for the second time. If it failed to find out a
suitable dbf file, it will try other mixture method. You can also use
the full table name to quote your table. For instance, 'select * from
"Test.dBf"'.
Any question or problem? Please don't hesitate to let me know.
With best regards,
Zhao Yonghong
System Analyst
[email protected]

How to capture the remot desktop using RMI?

Hi friends..
I am doing a mini project to capture the remot desktop using RMI. I am very new with this subject. So 'm waiting for the help of experts...

You can't. RMI doesn't do that. After you have captured it, some other way, you can transmit it via RMI, or plain Sockets, or several other ways.

How to use third party jdbc drivers ?

Hi,
Im new to sun one app server.i have some existing CMP
bean (currently testing under J2EE RI).database used is
SQL server 2000 and using a 3 rd party JDBC Driver.
my question is. if i switch to sun one app server, do i need
anyother third party stuff to support CMP using SQL
Server? (other than the exisiting jdbc driver andSQL Server).
I read somewhere that in sun one we need to get a
persistance manger from the 3 rd part. is it necessary?
can i use my plain jdbc driver with the builtin persistance
manager of sun one app server?. how can i do that ?
thanks in advance
-mr ex

Hi,
Persistence manager from 3rd party is not required.You
can use the built in persistence manager of Sun one application server.
You can refer the following link for creating new persistence manager
http://docs.sun.com/source/816-7156-10/agj2eres.html#47595
Get back in case of issues

Oracle deadlock - how to use "synchronised" keyword in a transaction?

Hi,
I use WL6.1 SP4, Oracle 8.1.6, with some Java objects which execute a
lot
of SQL queries (mixed update, insert and select) using plain JDBC
calls,
and Weblogic connection pools. These objects are called by servlets.
I experienced recently deadlocks when two users call the object at the
same
time (See error below).
I execute the queries using "synchronized" keyword in the following
way:
synchronized (this)
conConnection.setAutoCommit(false);
executeTransaction(myStatement);
conConnection.commit();
executeTransaction is overriden in sub-classes and is the method which
executes
all the queries.
It calls methods in other objects. These methods are not declared as
synchronized.
1) Should they?
2) Should I use the keyword "synchronized" in another way?
3) This part of code is also called when I do only "select"
statements. I guess
it should only be synchronized when we do "update" and "insert" which
could lead
to a deadlock?
4) Do you have any idea why this deadlock occurs as I use the
"synchronized"
keyword, and one thread should wait until the other one has finished?
Thanks for any idea,
Stéphanie
----------------- error:
<ExecuteThread: '4' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
4 WHERE par.IDPARTICIPANT = 8983566>
<ExecuteThread: '11' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
6 WHERE par.IDPARTICIPANT = 8983570>
ORA-00060: deadlock detected while waiting for resource
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
     at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
     at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
     at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
     at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
     at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047)
     at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2709)
     at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:796)
     at weblogic.jdbc.pool.Statement.executeUpdate(Statement.java:872)
     at weblogic.jdbc.rmi.internal.StatementImpl.executeUpdate(StatementImpl.java:89)
     at weblogic.jdbc.rmi.SerialStatement.executeUpdate(SerialStatement.java:100)
     at bfinance.framework.EDBBLBean.executeSQL(EDBBLBean.java:299)

Hi Stepanie,
I'd try to group update statement together. Usually it helps.
Regards,
Slava Imeshev
"Stephanie" <[email protected]> wrote in message
news:[email protected]...
Thanks for your answer.
In the case you describe, is there a way to ensure that tx-2 waits for
tx-1
to be finished before beginning?
My transaction which causes the problem is the following (simplified):
UPDATE tableA SET islast=0 WHERE externalid=myid;
for (int i=0; i< aVector.size(); i++) {
INSERT INTO tableA (id, islast, ranking, externalid) (SELECT
SEQ_tableA.nextval, 1, 0, myid);
UPDATE tableA SET ranking = /*calculated ranking */
WHERE externalid=myid AND islast=1;
UPDATE tableB ....
commit;
tx-1 and tx-2 execute this transaction at the same time. tx-1 begins
The deadlock appears when tx-2 executes the second UPDATE tableA
query.
I don't see how I can avoid to execute these two update queries, so if
I can find another way to prevent deadlock, it would be great!
Stéphanie
Joseph Weinstein <[email protected]_this> wrote in message
news:<[email protected]_this>...
Stephanie wrote:
Hi,
I use WL6.1 SP4, Oracle 8.1.6, with some Java objects which execute a
lot
of SQL queries (mixed update, insert and select) using plain JDBC
calls,
and Weblogic connection pools. These objects are called by servlets.
I experienced recently deadlocks when two users call the object at the
same
time (See error below).Hi. The error you are getting isn't necessarily from a lack ofsynchronization
of your java objects. It has to do with the order in which you accessDBMS
data. You are getting ordinary DBMS deadlocks, which are caused when
two DBMS connections each have a lock the other wants, in order toproceed.
The DBMS will quickly discover this and will kill one transaction inorder to
let the other one proceed:
time 0: tx-1 and tx-2 have started.....
time 1: tx-1: update tableA set val = 1 where key = 'A'
time 2: tx-2: update tableB set val = 2 where key = 'B'
time 3: tx-1: update tableB set val = 1 where key = 'B' (waitsbecause tx-2 has the row
locked)
time 4: tx-2: update tableA set val = 2 where key = 'A' (waitsbecause tx-1 has the row
locked)
This is a deadlock. The solution is to organize your application code sothat every
transaction accesses the data in the same order, eg: update tableAfirst, then update tableB.
This will prevent deadlocks.
Joe Weinstein at BEA
I execute the queries using "synchronized" keyword in the following
way:
synchronized (this)
conConnection.setAutoCommit(false);
executeTransaction(myStatement);
conConnection.commit();
executeTransaction is overriden in sub-classes and is the method which
executes
all the queries.
It calls methods in other objects. These methods are not declared as
synchronized.
1) Should they?
2) Should I use the keyword "synchronized" in another way?
3) This part of code is also called when I do only "select"
statements. I guess
it should only be synchronized when we do "update" and "insert" which
could lead
to a deadlock?
4) Do you have any idea why this deadlock occurs as I use the
"synchronized"
keyword, and one thread should wait until the other one has finished?
Thanks for any idea,
Stéphanie
----------------- error:
<ExecuteThread: '4' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
4 WHERE par.IDPARTICIPANT = 8983566>
<ExecuteThread: '11' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
6 WHERE par.IDPARTICIPANT = 8983570>
ORA-00060: deadlock detected while waiting for resource
at
oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
atoracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
atoracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
atoracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047
atoracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
atoracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java
:2709)
atoracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:796)
atweblogic.jdbc.pool.Statement.executeUpdate(Statement.java:872)
atweblogic.jdbc.rmi.internal.StatementImpl.executeUpdate(StatementImpl.java:89
atweblogic.jdbc.rmi.SerialStatement.executeUpdate(SerialStatement.java:100)
at bfinance.framework.EDBBLBean.executeSQL(EDBBLBean.java:299)

Problem when using cloudscape on JBoss

Hi All,
I try to run Petstore 1.3.2 on JBoss 3.2.3. I used a patch for Petstore 1.3.2 to run on JBoss 3.0.1 RC1. I tested, this patch works on 3.0.1 well. Using database cloudscape, provided by j2eesdk 1.3.1.
But it doesnt work in 3.2.3.
link to the patch and doc:
http://docs.huihoo.com/jboss/petstore.html
I changed two things of JBoss 3.2.3:
First, I changed "C:\jboss-3.2.3\server\default\conf\login-config.xml"
add following lines into it:
Code:
<application-policy name = "CloudscapeDbRealm">
       <authentication>
          <login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule" flag = "required">
             <module-option name = "principal"></module-option>
             <module-option name = "userName">estoreuser</module-option>
             <module-option name = "password">estore</module-option>
             <module-option name = "managedConnectionFactoryName">jboss.jca:service=LocalTxCM,name=EstoreDataSource</module-option>
          </login-module>
       </authentication>
    </application-policy>
    <application-policy name = "CloudscapeDbRealmInventory">
       <authentication>
          <login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule" flag = "required">
             <module-option name = "principal"></module-option>
             <module-option name = "userName">estoreuser</module-option>
             <module-option name = "password">estore</module-option>
             <module-option name = "managedConnectionFactoryName">jboss.jca:service=LocalTxCM,name=InventoryDataSource</module-option>
          </login-module>
       </authentication>
    </application-policy>     --------------------------------------------------------------------
Second, I copy a file called "cloudscape-service.xml" into "C:\jboss-3.2.3\server\default\deploy"
The content of this file:
<server>
<mbean code="org.jboss.resource.connectionmanager.LocalTxConnectionManager" name="jboss.jca:service=LocalTxCM,name=EstoreDataSource">
    <attribute name="SecurityDomainJndiName">CloudscapeDbRealm</attribute>
    <depends optional-attribute-name="ManagedConnectionFactoryName">
      
      <mbean code="org.jboss.resource.connectionmanager.RARDeployment" name="jboss.jca:service=LocalTxDS,name=EstoreDataSource"> 
        <attribute name="JndiName">EstoreDB</attribute>
        <attribute name="ManagedConnectionFactoryProperties">
          <properties>
            <config-property name="ConnectionURL" type="java.lang.String">jdbc:rmi://localhost:1099/jdbc:cloudscape:EstoreDB;create=true</config-property>
            <config-property name="DriverClass" type="java.lang.String">COM.cloudscape.core.RmiJdbcDriver</config-property>
            
            <config-property name="UserName" type="java.lang.String">estoreuser</config-property>
            <config-property name="Password" type="java.lang.String">estore</config-property>
          </properties>
        </attribute>
        
        <depends optional-attribute-name="OldRarDeployment">jboss.jca:service=RARDeployment,name=JBoss LocalTransaction JDBC Wrapper</depends>
      </mbean>
    </depends>
    <depends optional-attribute-name="ManagedConnectionPool">
      
      <mbean code="org.jboss.resource.connectionmanager.JBossManagedConnectionPool" name="jboss.jca:service=LocalTxPool,name=EstoreDataSource">
        <attribute name="MinSize">0</attribute>
        <attribute name="MaxSize">50</attribute>
        <attribute name="BlockingTimeoutMillis">5000</attribute>
        <attribute name="IdleTimeoutMinutes">15</attribute>
        <attribute name="Criteria">ByContainer</attribute>
      </mbean>
    </depends>
    <depends optional-attribute-name="CachedConnectionManager">jboss.jca:service=CachedConnectionManager</depends>
    <depends optional-attribute-name="JaasSecurityManagerService">jboss.security:service=JaasSecurityManager</depends>
    <attribute name="TransactionManager">java:/TransactionManager</attribute>
    
    <depends>jboss.jca:service=RARDeployer</depends>
</mbean>
<mbean code="org.jboss.resource.connectionmanager.LocalTxConnectionManager" name="jboss.jca:service=LocalTxCM,name=InventoryDataSource">
    
    <attribute name="SecurityDomainJndiName">CloudscapeDbRealmInventory</attribute>
    <depends optional-attribute-name="ManagedConnectionFactoryName">
      
      <mbean code="org.jboss.resource.connectionmanager.RARDeployment" name="jboss.jca:service=LocalTxDS,name=InventoryDataSource"> 
        <attribute name="JndiName">InventoryDB</attribute>
        <attribute name="ManagedConnectionFactoryProperties">
          <properties>
            <config-property name="ConnectionURL" type="java.lang.String">jdbc:rmi://localhost:1099/jdbc:cloudscape:EstoreDB;create=true</config-property>
            <config-property name="DriverClass" type="java.lang.String">COM.cloudscape.core.RmiJdbcDriver</config-property>
            
            <config-property name="UserName" type="java.lang.String">estoreuser</config-property>
            <config-property name="Password" type="java.lang.String">estore</config-property>
          </properties>
        </attribute>
        
        <depends optional-attribute-name="OldRarDeployment">jboss.jca:service=RARDeployment,name=JBoss LocalTransaction JDBC Wrapper</depends>
      </mbean>
    </depends>
    <depends optional-attribute-name="ManagedConnectionPool">
      
      <mbean code="org.jboss.resource.connectionmanager.JBossManagedConnectionPool" name="jboss.jca:service=LocalTxPool,name=InventoryDataSource">
        <attribute name="MinSize">0</attribute>
        <attribute name="MaxSize">50</attribute>
        <attribute name="BlockingTimeoutMillis">5000</attribute>
        <attribute name="IdleTimeoutMinutes">15</attribute>
        <attribute name="Criteria">ByContainer</attribute>
      </mbean>
    </depends>
    <depends optional-attribute-name="CachedConnectionManager">jboss.jca:service=CachedConnectionManager</depends>
    <depends optional-attribute-name="JaasSecurityManagerService">jboss.security:service=JaasSecurityManager</depends>
    <attribute name="TransactionManager">java:/TransactionManager</attribute>
    
    <depends>jboss.jca:service=RARDeployer</depends>
</mbean>
</server>
(I started cloudscape.)
JBoss 3.2.3 seems has no problem with the modification of "login-config.xml".
However, JBoss 3.2.3 can't deploy "cloudscape-service.xml". It shows error msg when I start it:
12:22:18,140 ERROR [URLDeploymentScanner] MBeanException: Exception in MBean operation 'checkIncompleteDeployments()'
Cause: Incomplete Deployment listing:
Packages waiting for a deployer:
Incompletely deployed packages:
MBeans waiting for classes:
MBeans waiting for other MBeans:
[ObjectName: jboss.jca:service=LocalTxCM,name=EstoreDataSource
state: FAILED
I Depend On: jboss.jca:service=LocalTxDS,name=EstoreDataSource
Depends On Me: org.jboss.deployment.DeploymentException: Exception setting attribute javax.management.Attribute: name=ManagedConnectionFactoryName value=jboss.
jca:service=LocalTxDS,name=EstoreDataSource on mbean jboss.jca:service=LocalTxCM,name=EstoreDataSource; - nested throwable: (javax.management.AttributeNotFoundException: Writable attribute 'ManagedConnectionFactoryName' not found), ObjectName: jboss.jca:service=LocalTxDS,name=EstoreDataSource
state: FAILED
I Depend On:
Depends On Me: jboss.jca:service=LocalTxCM,name=EstoreDataSource
org.jboss.deployment.DeploymentException: No Attribute found with name: JndiName, ObjectName:
jboss.jca:service=LocalTxCM,name=InventoryDataSource
state: FAILED
I Depend On: jboss.jca:service=LocalTxDS,name=InventoryDataSource
Depends On Me: org.jboss.deployment.DeploymentException: Exception setting attribute javax.management.Attribute: name=ManagedConnectionFactoryName value=jboss.
jca:service=LocalTxDS,name=InventoryDataSource on mbean jboss.jca:service=LocalTxCM,name=InventoryDataSource; - nested
throwable: (javax.management.AttributeNotFoundException: Writable attribute 'ManagedConnectionFactoryName' not found), ObjectName: jboss.jca:service=LocalTxDS,name=InventoryDataSource
state: FAILED
I Depend On:
Depends On Me: jboss.jca:service=LocalTxCM,name=InventoryDataSource
org.jboss.deployment.DeploymentException: No Attribute found with name: JndiName
The Petstore still can run, but shows "Unable to Connect to Database
Database Connection is closed: Confirm that you have started your database."
Could anyone kindly help with this problem, please?
The reason why I using 3.2.3 is the project I am working on need to use TPTP BTM to monitor Petstore.
But eclipse seems just support JBoss 3.2.3 and JBoss 4.0.
I have the same problem with JBoss 4.0.5 GA.
Thank you very much!

Hi,
I am having the same issue with Siebel on Demand web services. I was wondering if you ever solved this issue???

Is there any way to map tables in rutime dynamically?

Hi
Thank you for reading my post
My question is mostly technical and i want to know whether with EJB 3.0 (JPA) can do this or not.
we have an application which we are going to port it to EJB 3.0 from plain JDBC.
In our application, we have tables which are created after we complete the code,
Tables are created in customer environment based on thier requirement. we store all details about tables in our metadata system. this details contain table structure and business roles for that tables
So, We have some tables which we know all of its details but we do not have access to application to recompile it or do mapping procedure again.
And we need to store records into those tables and also perform EJB Query on them.
What i want to know is:
-Is there any way that we could map them dynamically in runtime?
-How we can query them if we can not map them programically?
-What will be the query result? it is a collection? if it is a collection, then what are collection elements?
Thanks

Thank you for reply.
We have some tables that are added to our system after we developed the core application.
Now we need to access those tables using EJB 3.0 .
We can not predict what kind of tables will be added, when customer add those table they also provide vast amount of metadata that our application need.
before we think about moving to EJB 3.0, we used JDBC to handle CRUD on those new tables based on metadata that customer file into our core application.
Now that we thought to move to EJB 3.0, we do not know how to handle those new tables that cutomer define.
We can not predict what kind of table they will create, so we should find some way to :
Create all required EJB 3.0 artifacts from
-A database Table
-and business metadata that customer file into our core application.
when we had JDBC, we could create dynamic SQL statement using table name and those meta data. but now with EJB 3.0 we can not find a way to do this because EJB 3.0 need some java class to be present before we could map anything.
Thanks

Re: [SunONE-JATO] Re: Using an object to store and display data

Personally, I think there is little or no value to creating a "domain"
object that itself relies on a JATO QueryModel internally, but hides that
fact and requires use of BeanAdapterModel.
It would be more appropriate (and much less work, and more scalable) to just
derive a QueryModel subclass and add the domain-specific behavior to the
model. In other words, what's the point of creating an object that hides
JATO inside it when you're running in JATO to begin with? Now if the domain
object were doing plain JDBC, and thus trying to be JATO independent, that
would be different. However, you could still implement the Model interface
on the object (or use BeanAdapterModel) to integrate it seamlessly with the
View tier.
Todd
----- Original Message -----
From: "grschroeder" <grschroeder@y...>
Sent: Wednesday, July 31, 2002 12:00 PM
Subject: [SunONE-JATO] Re: Using an object to store and display data
Craig,
I think it all finally makes sense. First, your assumption is
correct regarding the process flow. The ViewBean will interact with
a custom Javabean which will then in turn interact with a SQL Model
to access the database. So now let me make sure I understand what I
need to do. Basically the custom Javabean will have a method to get
the SQLModel. I would then invoke the setValue method on the
SQLModel and call the appropriate execute method( e.g.,
executeUpdate, etc. ) just like I would do from a ViewBean. Does
this sound correct?
Thanks,
Greg
--- In SunONE-JATO@y..., "Craig V. Conover" <craig.conover@s...>
wrote:
Greg,
see below...
grschroeder wrote:
Thanks for the help Craig. I looked at the sample code that makes
use of the BeanAdapterModel. Basically it looks like it allows a
view to interact with a bean the same way it would interact with
any
other model. That part I think I understand.
This is correct.
The part I'm a little
unclear on still is how to interface this BeanAdapterModel( which
is
a very basic model ) that I now have with a query model toactually
interact with the database.
Not sure what you mean by "interface this BeanAdapterModel ... witha
query model". Does this mean that you have a ViewBean the interactswith
a custom JavaBean via the BeanAdpterModel wrapper, and from the
JavaBean you are interacting with the SQL Model?
So it looks like this: ViewBean > BeanAdapterModel(Custom JavaBean)
SQL Model > RDBMS
That's what I am reading anyway. Please explain this to me.
Would I need to make direct JDBC calls
from my custom model instead of letting JATO dynamically create
the
calls for me?
If my assumptions above are correct, then the custom JavaBean cansimply
use the SQL Model in exactly the same manner as the ViewBean,otherwise,
if no SQL Model is involved, then yes, you need to handle JDBCdirectly,
which is fine, if you do it "right" (connection pooling, result set
handling, etc.).
Thanks,
Greg
--- In SunONE-JATO@y..., "Craig V. Conover" <craig.conover@s...>
wrote:
I think the best approach would be to treat your Domain Objects
(DO) as
the Database (the enterprise tier) from JATO's perspective. You
could
create custom models that interface with our DO's and then the
JATO
Views could easily bind to the custom DO models just like anyother
model. This should eliminate the need for pushing data/objectsfrom
>
view
to model to database.
There is a JATO class called BeanAdapterModel that might be just
what
you need, however, I am not experienced with using it. Maybe
someone
else on my team or in the community could better explain how to
use
>
this
class.
craig
grschroeder wrote:
Venki,
Thanks for the response. Actually, I'm not sure if I can answer
all
of your questions because those are some of the same questions
that
we're trying to answer ourselves. Basically, what we're trying
to
>do
is incorporate our domain object model into the JATO framework.
My
thinking was that one way we could accomplish this was by
storing
>a
Javabean object in the HTTPSession to represent an object in the
domain model, and that the Viewbean and JATO Model could get and
set
data from there. If you have a better suggestion of how to
accomplish this, I'm definitely open to hearing it.
Thanks,
Greg
--- In SunONE-JATO@y..., Venki <heyvenki@y...> wrote:
OK grschroeder , first let me get this straight:
0. Are you going to pass this object to the model, or are u
going
>
to pass the session object to the model?
1. Is there any specific reason for this approach you are
taking?
2. Will there be a notification from the object u havementioned
>to
have the model persist the data?
3. What about the reverse case, when the model refreshes the
data,
how are you going to refresh you object?
4. The JavaBean Object that u are talking about, is it your own
object or is it implementation of an existing JATO interface?
~Venki
grschroeder wrote:I'm fairly new to JATO, but I think I now
have
>a
basic understanding
of how Viewbeans and Models interact. However, I want to
incorporate
the use of a Javabean object that will be stored in the HTTP
session
and will act as the connection between the Viewbean and Model
instead
of having the Viewbean and Model interact directly with each
other.
Basically I would like to have the Model set data in the object
stored in the session so that the Viewbean can pull it out to
display
it. And vice versa, once the user modifies the data and is
ready
>
to
persist it, I would like to have the Viewbean set data in the
object
stored in the session so that the Model can pull it out to
store
>it
in the database. I'm not sure what the best approach would be
to
accomplish this. Any help you could give would be greatly
appreciated.
Thanks,
Greg
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
Service.
Venki
IT Solutions
#6, Pycrofts Garden Road, Nugambakkam, Chennai - 600 006
91-44-4925740(Home) 91-44-8212877(Work)
* Luck is what happens when Preparation meets Opportunity.
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
>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
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

Personally, I think there is little or no value to creating a "domain"
object that itself relies on a JATO QueryModel internally, but hides that
fact and requires use of BeanAdapterModel.
It would be more appropriate (and much less work, and more scalable) to just
derive a QueryModel subclass and add the domain-specific behavior to the
model. In other words, what's the point of creating an object that hides
JATO inside it when you're running in JATO to begin with? Now if the domain
object were doing plain JDBC, and thus trying to be JATO independent, that
would be different. However, you could still implement the Model interface
on the object (or use BeanAdapterModel) to integrate it seamlessly with the
View tier.
Todd
----- Original Message -----
From: "grschroeder" <grschroeder@y...>
Sent: Wednesday, July 31, 2002 12:00 PM
Subject: [SunONE-JATO] Re: Using an object to store and display data
Craig,
I think it all finally makes sense. First, your assumption is
correct regarding the process flow. The ViewBean will interact with
a custom Javabean which will then in turn interact with a SQL Model
to access the database. So now let me make sure I understand what I
need to do. Basically the custom Javabean will have a method to get
the SQLModel. I would then invoke the setValue method on the
SQLModel and call the appropriate execute method( e.g.,
executeUpdate, etc. ) just like I would do from a ViewBean. Does
this sound correct?
Thanks,
Greg
--- In SunONE-JATO@y..., "Craig V. Conover" <craig.conover@s...>
wrote:
Greg,
see below...
grschroeder wrote:
Thanks for the help Craig. I looked at the sample code that makes
use of the BeanAdapterModel. Basically it looks like it allows a
view to interact with a bean the same way it would interact with
any
other model. That part I think I understand.
This is correct.
The part I'm a little
unclear on still is how to interface this BeanAdapterModel( which
is
a very basic model ) that I now have with a query model toactually
interact with the database.
Not sure what you mean by "interface this BeanAdapterModel ... witha
query model". Does this mean that you have a ViewBean the interactswith
a custom JavaBean via the BeanAdpterModel wrapper, and from the
JavaBean you are interacting with the SQL Model?
So it looks like this: ViewBean > BeanAdapterModel(Custom JavaBean)
SQL Model > RDBMS
That's what I am reading anyway. Please explain this to me.
Would I need to make direct JDBC calls
from my custom model instead of letting JATO dynamically create
the
calls for me?
If my assumptions above are correct, then the custom JavaBean cansimply
use the SQL Model in exactly the same manner as the ViewBean,otherwise,
if no SQL Model is involved, then yes, you need to handle JDBCdirectly,
which is fine, if you do it "right" (connection pooling, result set
handling, etc.).
Thanks,
Greg
--- In SunONE-JATO@y..., "Craig V. Conover" <craig.conover@s...>
wrote:
I think the best approach would be to treat your Domain Objects
(DO) as
the Database (the enterprise tier) from JATO's perspective. You
could
create custom models that interface with our DO's and then the
JATO
Views could easily bind to the custom DO models just like anyother
model. This should eliminate the need for pushing data/objectsfrom
>
view
to model to database.
There is a JATO class called BeanAdapterModel that might be just
what
you need, however, I am not experienced with using it. Maybe
someone
else on my team or in the community could better explain how to
use
>
this
class.
craig
grschroeder wrote:
Venki,
Thanks for the response. Actually, I'm not sure if I can answer
all
of your questions because those are some of the same questions
that
we're trying to answer ourselves. Basically, what we're trying
to
>do
is incorporate our domain object model into the JATO framework.
My
thinking was that one way we could accomplish this was by
storing
>a
Javabean object in the HTTPSession to represent an object in the
domain model, and that the Viewbean and JATO Model could get and
set
data from there. If you have a better suggestion of how to
accomplish this, I'm definitely open to hearing it.
Thanks,
Greg
--- In SunONE-JATO@y..., Venki <heyvenki@y...> wrote:
OK grschroeder , first let me get this straight:
0. Are you going to pass this object to the model, or are u
going
>
to pass the session object to the model?
1. Is there any specific reason for this approach you are
taking?
2. Will there be a notification from the object u havementioned
>to
have the model persist the data?
3. What about the reverse case, when the model refreshes the
data,
how are you going to refresh you object?
4. The JavaBean Object that u are talking about, is it your own
object or is it implementation of an existing JATO interface?
~Venki
grschroeder wrote:I'm fairly new to JATO, but I think I now
have
>a
basic understanding
of how Viewbeans and Models interact. However, I want to
incorporate
the use of a Javabean object that will be stored in the HTTP
session
and will act as the connection between the Viewbean and Model
instead
of having the Viewbean and Model interact directly with each
other.
Basically I would like to have the Model set data in the object
stored in the session so that the Viewbean can pull it out to
display
it. And vice versa, once the user modifies the data and is
ready
>
to
persist it, I would like to have the Viewbean set data in the
object
stored in the session so that the Model can pull it out to
store
>it
in the database. I'm not sure what the best approach would be
to
accomplish this. Any help you could give would be greatly
appreciated.
Thanks,
Greg
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
Service.
Venki
IT Solutions
#6, Pycrofts Garden Road, Nugambakkam, Chennai - 600 006
91-44-4925740(Home) 91-44-8212877(Work)
* Luck is what happens when Preparation meets Opportunity.
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
>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
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

RMI or plain JDBC???

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