How to call c functions that expects c structs from java program?

i need to call from my java program to c functions that get
c structs as a parameters in their prototype.
as you probablly know java is not working with structs (classes only), so my question is how can i do it , i mean call the c functions that gets structs as parameters form java????

i believe your c function can accept a jobject and then inside your c function you have to translate that jobject into a c struct by using the jni methods.
the only reason your c function cant accept structs from java is because java does not have such structures. your c function can accept any data type that has been defined and a jobject has been defined.
if you have no control over the c functions that are being called, you need to write a wrapper function for those c function. the wrapper functions do the translation from jobject to a struct...then call the c other c functions.

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Message was edited by: Prabhu Peram

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SOLVED: How can I use or call a function that returns %ROWTYPE?

Hi
edit: you can probably skip all this guff and go straight to the bottom...In the end this is probably just a question of how to use a function that returns a %rowtype. Thanks.
Currently reading Feuerstein's tome, 5th ed. I've downloaded and run the file genaa.sp, which is a code generator. Specifically, you feed it a table name and it generates code (package header and package body) that will create a cache of the specified table's contents.
So, I ran:
HR@XE> @"C:\Documents and Settings\Jason\My Documents\Work\SQL\OPP5.WEB.CODE\OPP5.WEB.CODE\genaa.sp"
749 /
Procedure created.
HR@XE> exec genaa('EMPLOYEES');which generated a nice bunch of code, viz:
create or replace package EMPLOYEES_cache is
    function onerow ( EMPLOYEE_ID_in IN HR.EMPLOYEES.EMPLOYEE_ID%TYPE) return HR.EMPLOYEES%ROWTYPE;
    function onerow_by_EMP_EMAIL_UK (EMAIL_in IN HR.EMPLOYEES.EMAIL%TYPE) return HR.EMPLOYEES%ROWTYPE;
    procedure test;
end EMPLOYEES_cache;
create or replace package body EMPLOYEES_cache is
    TYPE EMPLOYEES_aat IS TABLE OF HR.EMPLOYEES%ROWTYPE INDEX BY PLS_INTEGER;
    EMP_EMP_ID_PK_aa EMPLOYEES_aat;
    TYPE EMP_EMAIL_UK_aat IS TABLE OF HR.EMPLOYEES.EMPLOYEE_ID%TYPE INDEX BY HR.EMPLOYEES.EMAIL%TYPE;
    EMP_EMAIL_UK_aa EMP_EMAIL_UK_aat;
    function onerow ( EMPLOYEE_ID_in IN HR.EMPLOYEES.EMPLOYEE_ID%TYPE)
        return HR.EMPLOYEES%ROWTYPE is
        begin
            return EMP_EMP_ID_PK_aa (EMPLOYEE_ID_in);
        end;
    function onerow_by_EMP_EMAIL_UK (EMAIL_in IN HR.EMPLOYEES.EMAIL%TYPE)
        return HR.EMPLOYEES%ROWTYPE is
        begin
            return EMP_EMP_ID_PK_aa (EMP_EMAIL_UK_aa (EMAIL_in));
        end;
    procedure load_arrays is
        begin
            FOR rec IN (SELECT * FROM HR.EMPLOYEES)
            LOOP
                EMP_EMP_ID_PK_aa(rec.EMPLOYEE_ID) := rec;
                EMP_EMAIL_UK_aa(rec.EMAIL) := rec.EMPLOYEE_ID;
            end loop;
        END load_arrays;
    procedure test is
        pky_rec HR.EMPLOYEES%ROWTYPE;
        EMP_EMAIL_UK_aa_rec HR.EMPLOYEES%ROWTYPE;
        begin
            for rec in (select * from HR.EMPLOYEES) loop
                pky_rec := onerow (rec.EMPLOYEE_ID);
                EMP_EMAIL_UK_aa_rec := onerow_by_EMP_EMAIL_UK (rec.EMAIL);
                if rec.EMPLOYEE_ID = EMP_EMAIL_UK_aa_rec.EMPLOYEE_ID then
                    dbms_output.put_line ('EMP_EMAIL_UK lookup OK');
                else
                    dbms_output.put_line ('EMP_EMAIL_UK lookup NOT OK');
                end if;
            end loop;
        end test;
    BEGIN
        load_arrays;
    end EMPLOYEES_cache;
/which I have run successfully:
HR@XE> @"C:\Documents and Settings\Jason\My Documents\Work\SQL\EMPLOYEES_CACHE.sql"
Package created.
Package body created.I am now trying to use the functionality within the package.
I have figured out that the section
    BEGIN
        load_arrays;
    end EMPLOYEES_cache;
/is the initialization section, and my understanding is that this is supposed to run when any of the package variables or functions are referenced. Is that correct?
With that in mind, I'm trying to call the onerow() function, but it's not working:
HR@XE> select onerow(100) from dual;
select onerow(100) from dual
ERROR at line 1:
ORA-00904: "ONEROW": invalid identifier
HR@XE> select employees_cache.onerow(100) from dual;
select employees_cache.onerow(100) from dual
ERROR at line 1:
ORA-06553: PLS-801: internal error [55018]
HR@XE> select table(employees_cache.onerow(100)) from dual;
select table(employees_cache.onerow(100)) from dual
ERROR at line 1:
ORA-00936: missing expressionHe provides the code genaa.sp, and a very brief description of what it does, but doesn't tell us how to run the generated code!
Now, I have just done some googling, and it seems that what I am trying to do isn't possible. Apparently %ROWTYPE is PL/SQL, and not understood by SQL, so you can't call onerow() from sql. Correct?
So I try wrapping the call in an exec:
HR@XE> exec select employees_cache.onerow(100) from dual;
BEGIN select employees_cache.onerow(100) from dual; END;
ERROR at line 1:
ORA-06550: line 1, column 30:
PLS-00382: expression is of wrong type
ORA-06550: line 1, column 7:
PLS-00428: an INTO clause is expected in this SELECT statement
HR@XE> exec select table(employees_cache.onerow(100)) from dual;
BEGIN select table(employees_cache.onerow(100)) from dual; END;
ERROR at line 1:
ORA-06550: line 1, column 14:
PL/SQL: ORA-00936: missing expression
ORA-06550: line 1, column 7:
PL/SQL: SQL Statement ignored
HR@XE> exec employees_cache.onerow(100)
BEGIN employees_cache.onerow(100); END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00221: 'ONEROW' is not a procedure or is undefined
ORA-06550: line 1, column 7:
PL/SQL: Statement ignoredNo joy.
Of course, now that I'm looking at it again, it seems that the way to go is indicated by the first error:
PLS-00428: an INTO clause is expected in this SELECT statement
So am I supposed to create a type of EMPLOYEES%ROWTYPE in a PL/SQL procedure, and the idea of this code, is that the first call to onerow() runs the initialiation code, which populates the cache, and all subsequent calls to onerow() (whether by my session or any other) will use the cache?
I've had a stab at this, but still, no joy:
create or replace procedure testcache is
    emp employees%rowtype;
    begin
        select employees_cache.onerow(100) from dual into emp;
        dbms_output.put_line('Emp id: ' || emp.employee_id);
    end testcache;
show errors
HR@XE> @testcache.sql
Warning: Procedure created with compilation errors.
Errors for PROCEDURE TESTCACHE:
LINE/COL ERROR
4/9      PL/SQL: SQL Statement ignored
4/54     PL/SQL: ORA-00933: SQL command not properly ended
HR@XE>Have a feeling this should be really easy. Can anybody help?
Many thanks in advance.
Jason
Edited by: 942375 on 08-Feb-2013 11:45

>
Ha, figured it out
>
Hopefully you also figured out that the example is just that: a technical example of how to use certain Oracle functionality. Unfortunately it is also an example of what you should NOT do in an actual application.
That code isn't scaleable, uses expensive PGA memory, has no limit on the amount of memory that might be used and, contrary to your belief will result in EVERY SESSION HAVING ITS OWN CACHE of exactly the same data if the session even touches that package.
Mr. Feuerstein is an expert in SQL and PL/SQL and his books cover virtually all of the functionality available. He also does an excellent job of providing examples to illustrate how that functionality can be combined and used. But the bulk of those examples are intended solely to illustrate the 'technical' aspects of the technology. They do not necessarily reflect best practices and they often do not address performance or other issues that need to be considered when actually using those techniques in a particular application. The examples show WHAT can be done but not necessarily WHEN or even IF a given technique should be used.
It is up to the reader to learn the advantages and disadvantages of each technicalogical piece and determine when and how to use them.
>
Now, I have just done some googling, and it seems that what I am trying to do isn't possible. Apparently %ROWTYPE is PL/SQL, and not understood by SQL, so you can't call onerow() from sql. Correct?
>
That is correct. To be used by SQL you would need to create SQL types using the CREATE TYPE syntax. Currently that syntax does not support anything similar to %ROWTYPE.
>
So am I supposed to create a type of EMPLOYEES%ROWTYPE in a PL/SQL procedure, and the idea of this code, is that the first call to onerow() runs the initialiation code, which populates the cache, and all subsequent calls to onerow() (whether by my session or any other) will use the cache?
>
NO! That is a common misconception. Each session has its own set of package variables. Any session that touches that package will cause the entire EMPLOYEES table to be queried and stored in a new associative array specifically for that session.
That duplicates the cache for each session using the package. So while there might be some marginal benefit for a single session to cache data like that the benefit usually disappears if multiple sessions are involved.
The main use case that I am aware of where such caching has benefit is during ETL processing of staged data when the processing of each record is too complex to be done in SQL and the records need to be BULK loaded and the data manipulated in a loop. Then using an associative array as a lookup table to quickly get a small amount of data can be effective. And if the ETL procedure is being processed in parallel (meaning different sessions) then for a small lookup array the additional memory use is tolerable.
Mitigating against that is the fact that:
1. Such frequently used data that you might store in the array is likely to be cached by Oracle in the buffer cache anyway
2. Newer versions of Oracle now have more than one cache
3. The SQL query needed to get the data from the table will use a bind variable that eliminates repeated hard parsing.
4. The cursor and the buffer caches ARE SHARED by multiple sessions globally.
So the short story is that there would rarely be a use case where ARRAYs like that would be preferred over accessing the data from the table.

How to call C function in .m file from another function in a .mm file

I am making an interface class between a C library and an objetive C application.
I have not problem calling function the C library from .mm funstions,
but I am having problems calling .m functions from the .mm class.
here is an example of what I mean.
here in my .m vector file
*struct dVector*
* float m_x;*
* float m_y;*
* float m_z;*
* float m_w;*
*struct dVector InitVector (float x, float y, float z, float w);*
*struct dVector AddVector (struct dVector* A, struct dVector* B);*
*struct dVector SubVector (struct dVector* A, struct dVector* B);*
here is my .mm class
*#import <Foundation/Foundation.h>*
*@interface iNewton : NSObject*
* void* m_world;*
*-(id) init;*
*-(void) dealloc;*
-(void) CreateBox: (Entity*) ent: (int) shapeId;*
@end
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[code]-(void*) CreateBox: (Entity*) ent: (int) shapeId
struct dVector minBox;
struct dVector maxBox;
// this is fine
[ent GetBBox: &minBox: &maxBox];
//calculate the box size and dimensions of the physics collision shape
// this report a link errors, and I do no knwo why
struct dVector size = SubVector(&maxBox, &minBox);
struct dVector origin = AddVector (&maxBox, &minBox);
// thsi work without problemen
return NewtonCreateBox ((NewtonWorld*) world, size.m_x, size.m_y, size.m_z, shapeId, &offset.mfront.mx);
I get these compiler errors
Building target “tutorial102AddingRigidBody” of project “newton_iPhone” with configuration “Debug_Emulation” — (3 errors)
cd /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newton_iPhone
setenv MACOSXDEPLOYMENTTARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr /bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.0 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.2 .1.sdk -L/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/DebugEmulation-iphonesimulator -L/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newton_iPhone/../sdk -F/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/DebugEmulation-iphonesimulator -filelist /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/Debug_Emulation-iphonesimulator/tutorial_102_AddingRigidBody.build/ Objects-normal/i386/tutorial_102AddingRigidBodies.LinkFileList -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -framework CoreGraphics -lnewton_iPhoneEmulation -o /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/Debug_Emulation-iphonesimulator/tutorial_102_AddingRigidBodies.app/ tutorial_102AddingRigidBodies
Undefined symbols:
"AddVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"SubVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"Scale(dVector*, float)", referenced from:
-[iNewton CreateBox::] in iNewton.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
"AddVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"SubVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"Scale(dVector*, float)", referenced from:
-[iNewton CreateBox::] in iNewton.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
Build failed (3 errors)
Basically I can call objective C class methods from .mm files,
but I can not call functions who are not members of a class from .mm funtions.
Does any one knows how I can solve this?
I have two books on objective C and neither show how to do that.
Please I will apreciate if some one can help me with this.
Julio Jerez

julio jerez wrote:
// this is fine
[ent GetBBox: &minBox: &maxBox];
why will tha be wrong?
ent is a objective C class with a method GetBBox
wich I use in hundred of places with out problem.
Beside that is not the problem that.
Well, you've got me on this one. You are correct. Apparently you don't need to specify the parameter names. Still, I strongly encourage you to use parameter names. Even though they apparently aren't required, I've never seen them not used. I would have expected to see:
[ent GetBBoxMin: & minBox max: & maxBox]
The problem is calling C function that are declared in .m files.
if you read the errors, they are linking errors not compiler errors.
this is a C function that is declared in a .m file
struct dVector size = SubVector(&maxBox, &minBox);
beside I also use those functions in many other place as well in teh project and they work.
If it helps I can post a link to the a download place to the xcode project maybe it is eassy to see what I am trying to do.
That would probably be a good idea.
Normally, all you need is
extern "C"
but there is so much missing from what you've posted that I can't tell for sure what is going on.

Can a loaded SWF call a function that lives in the parent?

I'm building a pretty simple Flash site in AS3. There is a
main movie (main.swf) that simply loads different swfs via buttons
on a main nav bar. The user clicks on a MC in "main.swf" and a
function is called, loadMyContent("section1.swf"), is called and it
animates in nicely. Other buttons use the same function, loading
section2.swf, section3.swf, etc.
I've defined how "loadMyContent()" works in the the main
movie's document class file. It's all working fine when I just need
to load content from a user action from the buttons that live in
"main.swf". I want to call that same "loadContent" function from
within "section1.swf" and have "main.swf" run it's "loadContent"
fuction, but I can't seem to figure out how to make a child call a
function that lives in the parent.
Is there any way of having my child do this?
I have a suspicion I may have to define that "loadContent"
somewhere else, but I'm a little stumped now. I'm not really
familiar with design patterns yet, although I want to get an
understanding of them sometime soon. Can anyone offer some help
with my immediate need or suggest a route to a solution?
Thanks.

kglad,
Thank you very much! That worked perfectly. My section1 FLA
is now compiling it's SWF without complaint.
In case someone else is following this, the exact code I
ended up using to cast "this.parent.parent" as a MovieClip is:
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The discussion I think kglad is referencing is
this
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How to call oracle function from ejb3

i'm trying to call an oracle query-function from ejb3.
The oracle function:
create or replace FUNCTION getSecThreadCount(secId in NUMBER,avai in NUMBER)
RETURN SYS_REFCURSOR is cur SYS_REFCURSOR;
m_sql VARCHAR2(250);
BEGIN
m_sql:='select count(thrId) from thread where secId='|| secid||'
and thrAvai='|| avai;
open cur for m_sql;
return cur;
END;
I'v tried several ways to call it,but all failed:
1. the calling code:
public Object getSectionThreadCount(int secId,int avai){
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Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: ORA-06550: row 1, col 7:
PLS-00221: 'GETSECTHREADCOUNT' not procedure or not defined
ORA-06550: row 1, col 7:
PL/SQL: Statement ignored
2. the calling code:
@SqlResultSetMapping(name = "getSecThreadCount_Mapping")
@NamedNativeQuery(name = "getSecThreadCount",
query = "{?=call getSecThreadCount(:secId,:avai)}",
resultSetMapping = "getSecThreadCount_Mapping",
hints = {@QueryHint(name = "org.hibernate.callable", value = "true"),
          @QueryHint(name = "org.hibernate.readOnly", value = "true")})
public Object getSectionThreadCount(int secId,int avai){
          Query query=manager.createNamedQuery("getSecThreadCount");
          query.setParameter("secId", secId);
          query.setParameter("avai", avai);
          return query.getSingleResult();
but i run into the exception:
Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: lost in index IN or OUT parameter:: 3
By the way, i have successfully called the function from hibernate. And i use oracle 11g, JBoss5 RC1.
Could anyone tell me how to call the function from EJB3?
Thanks.

Here's a working model:
package.procedure: (created in example schema scott)
CREATE OR REPLACE package body data_pkg as
type c_refcursor is ref cursor;
-- function that return all emps of a certain dept
function getEmployees ( p_deptId in number
return c_refcursor
is
    l_refcursor c_refcursor;
begin
     open l_refcursor
    for
          select e.empno as emp_id
          ,        e.ename as emp_name
          ,        e.job   as emp_job
          ,        e.hiredate as emp_hiredate
          from   emp e
          where e.DEPTNO = p_deptId;
    return l_refcursor;
end getEmployees;
end data_pkg;
/entity class:
package net.app.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedNativeQuery;
import javax.persistence.QueryHint;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@SuppressWarnings("serial")
@Entity
@Table (name="emp")
@SequenceGenerator(name = "EmployeeSequence", sequenceName = "emp_seq")
@NamedNativeQuery( name = "getEmpsByDeptId"
               , query = "{ ? = call data_pkg.getEmployees(?)}"
               , resultClass = Employee.class
               , hints = { @QueryHint(name = "org.hibernate.callable", value = "true")
                      , @QueryHint(name = "org.hibernate.readOnly", value = "true")
public class Employee implements Serializable
    @Id
    @Column(name="emp_id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "EmployeeSequence")
    private int id;
    @Column(name="emp_name")
    private String name;
    @Column(name="emp_job")
    private String job;
    @Column(name="emp_hiredate")
    private Date hiredate;
    // constructor
    public Employee (){}
    // getters and setters
    public int getId()
     return id;
etc...session bean:
package net.app.entity;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
@Stateless
public class ScottAdminImpl implements ScottAdmin
    @PersistenceContext
    private EntityManager entityManager;
    @SuppressWarnings("unchecked")
    public List<Employee> getEmployeesByDeptId(int deptId)
     ArrayList<Employee> empList;
     try
         Query query = entityManager.createNamedQuery("getEmpsByDeptId");
         query.setParameter(1, deptId);
         empList = (ArrayList<Employee>) query.getResultList();
         return empList;
     catch (Exception e)
         e.printStackTrace(System.out);
         return null;
}client:
package net.app.client;
import java.util.List;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
public class ScottClient
    public static void main(String[] args)
     try
         // create local interface
         InitialContext ctx = new InitialContext();
         ScottAdmin adminInterface = (ScottAdmin) ctx.lookup("ScottAdminImpl/remote");
         // select employees by deptno
         int deptno = 20;
         List<Employee> empList = adminInterface.getEmployeesByDeptId(deptno);
         // output
         System.out.println("Listing employees:");
         for (Employee emp : empList)
          System.out.println(emp.getId() + ": " + emp.getName() + ", " + emp.getJob() + ", " + emp.getHiredate());
     catch (NamingException e)
         e.printStackTrace(System.out);
}Basically you just ignore the refcursor outbound parameter.
This is a stored function, have yet to try outbound refcursor parameters in stored procedures...
Edited by: _Locutus on Apr 2, 2009 2:37 PM

How to call a function every 45 minutes?

Hi..
How to call a function after 45 minutes evry day..
That function returns a value.
Which is best? Thread or using timestamp?
Regards

Hello Joe,
I heard of this website, gurgle something, that actually let's you put in words like "java" and "scheduling" and it will spit out other websites that mention these terms. Fascinating stuff, hopefully I'll find the time to test it someday soon..
Lucky for you I have an article discussing solutions to your problem in my bookmarks:
http://www.ibm.com/developerworks/web/library/j-schedule.html
With kind regards
Ben

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