Named query creates wrong cast: CAST (? AS VARCHAR(32672))

Hello!
I'am working with Toplink on DB2 - which works great, so far - but now I face the following problem:
A named query produces the following sql-code:
... WHERE (SAMPLEFIELDNAME = CAST (? AS VARCHAR(32672) ))
The problem ist the cast: the data-base-fieldtype is a VARCHAR(255) so get an SQL-Exception. I can't change the database-schema, because this is legacy-stuff. I tried a lot (columnDefinition and length in @Column-annotation seem to be ignored at all) - but nothing worked.
Thank you!
Siegfried

Hi,
The DB2 Platform hard coded the casting of Strings to VARCHAR(32672) in the oracle.toplink.platform.database.DB2Platform class' writeParameterMarker method. So if the type is set to a String class on the argument, it will always be cast to VARCHAR(32672). You will need to override the writeParameterMarker method on a custom platform (extending DB2Platform) in such a way that if a string is given, VARCHAR(255) is used instead. That is, assuming all your strings are of size 255.
Best Regards,
Chris

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## Detail 0 ##
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 at oracle.jbo.server.ViewRowImpl.getAttributeInternal(ViewRowImpl.java:746)
 at oracle.adf.model.bean.DCDataRow.getAttributeInternal(DCDataRow.java:352)
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 at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:181)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
 at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:85)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:278)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:238)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:195)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:138)
 at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
 at oracle.security.jps.wls.JpsWlsFilter.doFilter(JpsWlsFilter.java:102)
 at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:65)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
 at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3496)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(Unknown Source)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)I try to print out a singlue AVG value in this way (main method of javaServerFacade class):
 public static void main(String [] args) {
 final JavaServiceFacade javaServiceFacade = new JavaServiceFacade();
 // TODO: Call methods on javaServiceFacade here...
 List<Polls> pollsAVG = javaServiceFacade.queryPollsFindAVG();
 for (Polls a: pollsAVG){
 System.out.println(a.getValue1());
...I get this error:
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to oracle.model.Polls
 at oracle.model.JavaServiceFacade.main(JavaServiceFacade.java:25)
Process exited with exit code 1.
...I've searched for Ljava in the documantation finding nothing interesting.

Named query question

Hi Guys,
I have the following problem - I know I did something wrong, but I cannot figure out how to correct it. Here is my question:
I have a table tableA, with composite key (col1, col2, col3, col4). I mapped the table, and create a Toplink named query (findCol3List)as such:
select distinct col3
from tableA
where col1=#col1 and col2=#col2
I created an EJB session method getCol3List(col1, col2) -
now when I run the application to call this EJB method, I got the following error at line:
List results = (List)session.executeQuery("findCol3List", String.class, params);
Exception Description: Missing descriptor for [java.lang.String] for query named [findCol3List].
I know there are multiple mistakes in my approach, but with my limited Toklink knowledge, I could not figure out.
Any help with be appreciated!

hello,
The executeQuery method is trying to look up the "findCol3List" in the descriptor for the class passed in. It is complaining because you passed in String.class which does not have a valid descriptor.
How/where did you define the named query? Chances are you defined it in the class used for TableA, and so should specify it in the executeQuery method:
session.executeQuery("findCol3List", tableA.class, params);
Best Regards,
Chris

FindByPrimaryKey named query

When creating a named query 'findByPrimaryKey', the workbench says 'The query for this finder will be generated at runtime.'
The object in question HAS a primary key set, but the sql generated from a findByPrimaryKey query doesn't contain a where clause, so it returns the first result:
session.executeQuery("findByPrimaryKey", RequestDelivery.class, "41");
generates the following sql:
ServerSession(20012340)--Connection(31335791)--SELECT DELIVERY_ID, CONTACT_ADDRESS, FILM_DELIVERY, DELIVERY_DATETIME, CONTACT_METHOD, REFLOC_ID, REQ_ID FROM REQUEST_DELIVERY
which is quite obviously wrong..
Is there something I'm missing, or am I misusing the findByPrimaryKey query.. ?

Hi,
The findByPrimaryKey query is kind of meant as a reserved name for entity finders. This is why you are seeing the comment that it will be generated for you. When you don't use CMP then you can still use this name for a query, but you would have to define the query in code. I would recommend that you actually use a different name, though to prevent confusion.
-Mike

Retrieving array of objects using Named Query

Can i retrieve an array of objects using a Named Query? The execute query method of Session returns only an Object but not an array. Please let me know if there is any possibility.
Thanks in advance,

Hi,
You define a named ReadAllQuery query object, and after query execution, you can cast the returned Object as Vector, and further convert it to an array.
King

How to write named query if we want to use IN syntax in our sql statement?

I cannot find a suitable category about named query, so please move to appropriate place if there is any.
When we write named query, below statement is fine.
Query q2 = em.createQuery("SELECT o FROM Table1 as o WHERE field1 = :input1"); q2.setParameter("input1", "value1");
Now, my question is, how can I write this type of query when we want to use the IN sql syntax? As below statement CANNOT return correct results. Even I tried to put a pair of single quote [ ':input2' ], it won't help also.
Query q2 = em.createQuery("SELECT o FROM Table1 as o WHERE field2 IN (:input2)"); q2.setParameter("input1", "3633, 3644");
Can anyone suggest? Thanks.

roamer wrote:
Now, my question is, how can I write this type of query when we want to use the IN sql syntax? As below statement CANNOT return correct results. Even I tried to put a pair of single quote [ ':input2' ], it won't help also.
Query q2 = em.createQuery("SELECT o FROM Table1 as o WHERE field2 IN (:input2)");
q2.setParameter("input1", "3633, 3644");
Can anyone suggest?The above is in your code right? Not in some configuration file?
Then you do it the same way as with regular jdbc/sql.
1. You start with a collection of values - call it collection A.
1. Create a for loop that dynamically creates the string using 'bind' variables (whatever you want to call the 'colon' entity in the above).
2. Call the createQuery method using the string that was created
3. Create a second loop that iterates over A and populates with setParameter.
Pseudo code
 Object[] A = ...
 String sql = "SELECT o FROM Table1 as o WHERE field2 IN (";
 for (int i=1; i <= A.length; i++)
 if (i == 1)
 sql += ":input" + i;
 else
 sql += ",:input" + i;
 sql += ")";
 Query q2 = em.createQuery(sql);
 for (int i=1; i <= A.length; i++
 q2.setParameter("input" + i, A[i-1]);
 }By the way there is a jdbc forum.

IN operator in Named Query

hi all,
is it possible to create a named query containing the IN clause if yes how to pass the parameters , i have smth like that:
"select * from tblUsers where employee_number in #param"
what should be the type of the parameter?

You can create a named query using an IN parameter, but you should be careful in doing this as an IN collection is not a valid parameter in SQL. TopLink will handle translating the IN as long as you are using dynamic SQL, or disable the prepare on the query. You can use Vector as the parameter value.
i.e.
ReadAllQuery query = new ReadAllQuery(Employee.class);
query.setSQLString("select * from tblUsers where employee_number in #param");
// Or: query.setSelectionCriteria(query.getExpressionBuilder().get("number").in(query.getExpressionBuilder().getParameter("param")));
query.setShouldPrepare(false);
query.addArgument("param");
Vector args = new Vector();
Vector param = new Vector();
param.add(new Integer(1));
param.add(new Integer(2));
param.add(new Integer(3));
args.add(param);
session.executeQuery(query, args);
// Or: session.executeQuery("findAllWithNumbers", Employee.class, args);

Derby db named query causes parse error when using derby db MONTH function

Hi all!
I'm trying to create an application using the persistance api and beans binding. I have created my database and entity classes.
My problem is creating a named query that uses some of the functionality from the derby database (which is embedded in the application).
I have a named query:
@NamedQuery(name = "Vehicles.findbymotmonth", query = "SELECT v FROM Vehicles v WHERE MONTH(v.lastmotdate) = :monthnumber") The actual query works fine when I send it directly to the db (with the parameter filled in) but causes an exception when used as a named query:
Local Exception Stack:
Exception [TOPLINK-8025] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.EJBQLException
Exception Description: Syntax error parsing the query [Vehicles.findbymotmonth: SELECT v FROM Vehicles v WHERE MONTH(v.lastmotdate) = :monthnumber], line 1, column 32: unexpected token [MONTH].
Internal Exception: line 1:32: unexpected token: MONTH
at oracle.toplink.essentials.exceptions.EJBQLException.unexpectedToken(EJBQLException.java:389)
... I've tried looking for solutions online but it seems evryone just writes up the original java db application example provided by sun and no one has tried doing more than "select c from customers c".
I'm using the netbeans ide (6.5).
Please tell me there is a simple solution to this and the persistance API can handle complex queries!
Thanks in advance.

one solution: assume the toplink library to be so full of bugs as to be unusable and switch to the hibernate persistance manager where it works fine.
Edited by: pointer2null on Feb 17, 2009 11:02 AM

Named query creates wrong cast: CAST (? AS VARCHAR(32672))

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