Q: 2-dim java Array to SQL rowtype?

I wrote a piece of software that enables access from SQL to OpenCyc (the worlds largest common sense knowledge base). (see http://www.opencyc.org/ and http://217.117.225.187/~yeb/ooi.pdf and for the code http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/opencyc/oracle/ )
It allows for queries like
SELECT * FROM TABLE(
SELECT cyc.askWithVariable( '(#$isa ?X #$Person)', '?X' ) FROM DUAL)
It uses java to connect to opencyc. In the example above, askWithVariable returns an oracle.sql.ARRAY, that is constructed like this:
ArrayDescriptor desc = ArrayDescriptor.createDescriptor("CYCLIST_TYPE", conn);
oracle.sql.ARRAY arrayanswer = new oracle.sql.ARRAY(desc, conn, cyclist.toArray());
The CYCLIST_TYPE is a TABLE OF VARCHAR(4000).
The call specification maps this cyclist_type to oracle.sql.ARRAY, so it can be used in queries like the example above.
Yesterday I've been trying (but not succeeding) to make a variant that returns a list of more than one variable; two dimensional array.
Q1: Nowhere I've seen a multi column example of the select * from table( a collection ) construct. Is this possible at all?
Q2: Is there a java example of a 2 dimensional array that gets converted to a PL/SQL or SQL type?
Thanks!
Yeb Havinga

But when I was created stored procedure, array and customised data type with in package, java throws an exception like an invalid pattern You will have to create array type outside the package to make it work.
Retruning array from plsql to java
http://otn.oracle.com/sample_code/tech/java/codesnippet/jdbc/varray/index.html
Writing array from java to plsql
http://asktom.oracle.com/pls/ask/f?p=4950:8:385799930469889632::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:712625135727,
Chandar

Similar Messages

Joining java array with SQL table in a stored procedure

Hey,
I am calling a pl/sql stored procedure from a java program passing two arrays (employees) and (departments) as parameters to the procedure. Within the procedure I have stored the arrays in a table of records like this:
type t_emp_type is record (employee_id number, department_id number);
type t_emp_tbl_type is table of t_emp_type index by binary_integer;
Where all elements in employees are stored in the employee_id column and departments are stored in the department_id column. So basically I've got a table like:
l_employee_tbl t_emp_tbl_type;
Looped through the arrays and stored the data like:
for i in 1..p_employees.count loop
l_employee_tbl(i).employee_id := p_employees(i);
l_employee_tbl(i).deparment_id := p_departments(i);
end loop;
Now I would like to compare my l_employee_tbl with a SQL table in the database. Basically I would like to join my l_employee_tbl table with a SQL table named departments on department_id, returning all department_id:s that was not found in table departments.
However, it is not possible to select from a user-defined table type. I have also tried to use the table() function and to cast l_employee_tbl, but found out it can't be done with records. And I would really like to use records or some other type where define my PL/SQL data. I know that you should not mix PL/SQL and SQL but in this case I think it is more efficient to try joining these "tables". Does anyone have a solution for this or advice to try something else out? It would be most appreciated.
Edited by: 963281 on 2012-okt-04 14:25
Edited by: 963281 on 2012-okt-05 01:53

963281 wrote:
I am calling a pl/sql stored procedure from a java program passing two arrays (p_employees) and (p_departments) as parameters to the procedure. Within the procedure I have stored the arrays in a table of records like this:
type t_emp_type is record (employee_id number, department_id number);
type t_emp_tbl_type is table of t_emp_type index by binary_integer;Why do you create an associative array?
Now I would like to compare my l_employee_tbl with a SQL table in the database. Basically I would like to join my l_employee_tbl table with a SQL table named departments on department_id, returning all department_id:s that was not found in table departments. Of course, not possible as the SQL engine does not support PL/SQL user defined types. PL/SQL however support user defined SQL types. Which makes SQL defined types a lot more flexible.
However, it is not possible to select from a user-defined table type. I have also tried to use the table() function and to cast l_employee_tbl, but found out it can't be done with records. Never mind SQL and PL/SQL - as a generic programming data structure principle. How do you expect being able to cast an associative array (name-value pairs) to a standard array? The two data structures are very different. So I'm puzzled in how you expect to move a non-scalar name-value pair data structure into a non-scalar value only data structure?
And I would really like to use records or some other type where define my PL/SQL data. Why exactly? If the Java or PL/SQL data structure is populated using SQL data and database data, and wanting to use that data structure in SQL, what is the point? Why pull SQL data into a client data structure at all then - surely it is far more performant and scalable to rather keep that data in the database, and do the joins/selects/filters/etc using SQL?
There is also the issue of scalability of local data structures in PL/SQL. The PL/SQL engine runs inside an Oracle server process, consuming private process memory on the server. The bigger the data structures used in PL/SQL, the more server memory needs to be allocated to that server process. This does not scale. Especially not if 10 or more such server processes are running the same PL/SQL code and each server needs to grab large chunks of server memory.
If the data from Java comes from another source (e.g. keyboard, etc), and you need a means of storing this data server-side for use by PL/SQL and SQL. There are 2 basic choices. PL/SQL arrays for smallish amounts of data - and basing these arrays preferable on SQL data types allowing the array to be used by both SQL and PL/SQL engines. If the amount of data is not smallish, then it should be stored in the SQL engine (database) as that is designed for that exact purpose. And if the data is transient, then a GTT (global temp table) structure can be used (and indexed for optimal access).

Passisng array from Java into PL/SQL procedure

Hi everybody!
I have type created with :
CREATE OR REPLACE TYPE my_type IS TABLE OF number;
Next I have procedure withinin a package which has parameters:
PROCEDURE my_proc
(p_Result OUT NUMBER,
p_Id table.column%TYPE,
p_MyType my_type
I call this procedure from Java :
import javax.sql.*;
import java.sql.*;
import oracle.jdbc.*;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
public class MyClass extends QueryClient {
private int Id;
private int type;
private Integer[] List;
private int result;
public MyClass(int Id, eType type,
Integer[] List) throws SQLException {
this.Id = Id;
this.type = (type.equals(eType.TYPE_EXPORT) ? 1 : 0);
this.List = List;
this.execute("{call my_package.my_proc(?,?,?,?)}");
public void body(CallableStatement stmt) throws SQLException {
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("MY_USER.MY_TYPE", getCon());
ARRAY array_to_pass = new ARRAY(descriptor, getCon(), this.List);
// register the type.
stmt.registerOutParameter(1, OracleTypes.NUMBER); // result of procedure calling
stmt.setInt(2, this.Id );
stmt.setInt(3, this.type);
stmt.setArray(4, array_to_pass);
// execute and retrieve the result set
stmt.execute();
this.result = stmt.getInt(1);
public int getResult() {
return result;
EVERYTHING WORKS FINE, BUT when I move type "my_type" into package header
TYPE my_type IS TABLE OF number;
I receive error after calling procedure
java.sql.SQLException: invalid name pattern: MY_USER.MY_TYPE
I dropped type my_type after moving it into package. So there is only one my_type, in the package.
User who call procedure is owner of the package.
So questions are:
1. Is it possible to have my_type within package without error?
2. Is it possible to describe my_type without having a connection to database? My aim is eliminate number of connections to database.
Thanks all.
Matus.

You can't use the packaged type for this. You need to use the original collection type (i.e. via the CREATE TYPE syntax) as you have discovered yourself.
Regards

Conversion of java Array to oracle SQL Array while calling Stored Procedure

How java Array can be converted to oracle SQL array while calling Stored procedure with callable statement.
i.e java Array ---> Sql Array in Oracle while setting the datatypes to callable statement arguments.

Look at:
http://forum.java.sun.com/thread.jsp?forum=48&thread=376735&tstart=0&trange=15
Paul

Manipulating java array object in an oracle procedure

hi there,
i have a java store procedure that returns an array of filenames, and i have an oracle stored procedure that will for each filename returned in the java array object, open that file do some processing and load the data into database tables, now my question is, would an oracle 9i varray object be compatible with a java array, or should i pass in a pl/sql table to store the filnames returned?
i really am stuck at this point and need help !!!!
Thanx

Wole,
Have you searched the code samples available at the Technet Web site? Could you not find a relevant one?
Have you tried searching the Ask Tom Web site?
Good Luck,
Avi.

Java and MS SQL Server 2000 problem, please help

please help me. I am using java and MS SQL Server 2000, and I'm trying to access and verify the login. I'm getting the following error message: [Microsoft][ODBC SQL Server Driver]Invalid Descriptor Index
Can any please help in this regard.
String userNumber = (String)userNumField.getValue();
char[] userPasswordArray = userPasswordField.getPassword();
String userPassword = new String(userPasswordArray);
     try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            java.sql.Connection connection = java.sql.DriverManager.getConnection("jdbc:odbc:Dikolobe_Data");
            java.sql.PreparedStatement statement = connection.prepareStatement(
                    "SELECT USER_NUMBER, USER_PASSWORD, USER_CLASS, USER_STATUS " +
                    "FROM SYS_USER " +
                    "WHERE (USER_NUMBER = ? AND USER_PASSWORD = ?);");
            statement.setString(1, userNumber);
            statement.setString(2, userPassword);
            java.sql.ResultSet result = statement.executeQuery();
            if(result.next()) {
                String userStatus = result.getString(4);
                if(userStatus.equals("logged on")) {
                    String loginErrorMessage = "User with number: " + userNumber + " is already logged on.";
                    javax.swing.JOptionPane loginErrorPane = getNarrowOptionPane(72);
                    loginErrorPane.setMessage(loginErrorMessage);
                    loginErrorPane.setMessageType(javax.swing.JOptionPane.ERROR_MESSAGE);
                    javax.swing.JDialog loginErrorDialog = loginErrorPane.createDialog(null, "Login Error");
                    loginErrorDialog.setVisible(true);
                else {
                    String userClassification = result.getString(3);
                    if(userClassification.equals("Administrator")) {
                        AdminHomePage newAdminHomePage = new AdminHomePage();
                        newAdminHomePage.setVisible(true);
                    else if(userClassification.equals("Educator")) {
                        EduHomePage newEduHomePage = new EduHomePage();
                        newEduHomePage.setVisible(true);
                    statement = connection.prepareStatement(
                            "UPDATE SYS_USER SET USER_STATUS = ? " +
                            "WHERE USER_NUMBER = ?");
                    statement.setString(1, "logged on");
                    statement.setString(2, userNumber);
                    statement.executeUpdate();
                    dispose();
            }

Doesn't the following link give you enough information?
http://www.google.com/search?q=invalid+descriptor+index
Anyway .. This error means that the given ResultSet column index which you're trying to retrieve the value from is out of the range.

Java with PL/SQL

Hi !
I hope that someone will be able to answer me. Is there any way to integrate java into PL/SQL to set a LDAP connexion context. In java, we can do something like :
// Set up the environment for creating the initial context
Hashtable env = new Hashtable(11);
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");
env.put("java.naming.ldap.version", "2");
// Create the initial context
DirContext ctx = new InitialDirContext(env);
I would like to be able to create my context and use it with the DBMS_LDAP in PL/SQL. Is there any way to do it ? Do I have to use DBMS_SESSION.set_context ? I'm new with all those concepts and it is really important...
Thanks for your help !
Chantale

> The problem is that we have a compatibility problem with LDAP. When I try to retrieve information
in LDAP, I have strange characters that appears instead of accents like é,è,ë or whatever... someone
in my developement team has the same problem and he solved it using java.naming.ldap.version and put
it in version 2. The problem is that he developed in Java and I am in PL/SQL. That's the problem...
No. That is not the problem.
The problem is that you have no clue what the problem is, and now jump at the first available thing that seems to be a solution for this unknown problem. And who knows just how many other problems this so-called solution will now introduce... never mind whether or not the root cause of the original problem will be solved by this solution.
Software engineering does not work like this.
Software engineering says: Identify the Problem.
Analyse the Problem.
Solve the ProblemAll you have identified is a symptom of some problem. A character set issue. How about identifying the actual problem and then solving that problem comprehensively?

Mapping Java Arrays

I was given an object model generated by an apache product, Axis. The generated java files use the Java Array in the following fashion:
Class Zoo {
private ArrayOfAnimals animals;
// â¦ public get/set methods cut
Class ArrayOfAnimals {
private Animal animals[];
// â¦ public get/set methods cut
Class Animal {
private String name;
// â¦ public get/set methods cut
I was tasked with mapping the one-to-many relationship between zoo and an array of animals using the Animal array. I canât find a mapping in TopLink to do this type of association. I am NOT allowed to modify the generated source code. I may be able to extend the generated classes, and perhaps provide a different superclass.
I am allowed to create the relational model for these domain classes. Can anyone help with this type of mapping?
Thanks

TopLink does not directly support arrays as the mapping type for a collection, only collection types that support the Collection and Map interfaces.
In general it seems odd to use an array instead of a Java collection which would be much more efficient (in terms of adding and removing) and much more functional. I would definitely suggest changing the generated code, or the way the code is generated if at all possible.
The easiest way to map the array in TopLink would be the use get/set methods for the 1-m mapping on the Zoo class that converted the array to/from a Collection.
i.e. something like,
public List getAnimalsList() {
return new Arrays.asList(animals.animals);
public void setAnimalsList(List list) {
animals.animals = (Animal[]) list.toArray();
In general TopLink uses its ContainerPolicy class to handle collections. It may also be possible (but advanced) to write a custom container policy for your 1-m mapping that handles arrays.

How to use Java with PL/SQL commands to send an email with attachment

Apologizes in advance if this is the wrong place to ask the question.
I need to use Java with PL/SQL commands to send an email with attachment. My java application runs from the command line and does some magic to gather info from an Oracle 11g db. If the DB has sendmail configured, I'd like to send the results of the data gathering as an attachment to the email addresses. I'm not sure how to do this. I've been reading up on on PL/SQL can send email with UTL_SMTP - with attachments. I'm just not sure how to translate that into being triggered by my Java application. Any suggestions or pointers on what I should read would be appreciated.
Background - I've been programming in Java for 10+ years, but this is my first time using databases. I also have been on these forums for a long time, but lost my profile when it was switched to Oracle.
Thanks for all help.

user13726880 wrote:
The original requirements were put together and given to me, an Oracle newbie. They expected the Java app to use something intrinsic to Oracle and Unix sendmail. To solve my problem, I use a JDBC connection to run some SQL commands. I take that data, format it and send the results by email to the user. By default the requirement is to send it as an HTML attachment using Unix 'sendmail'. So I do that using Runtime exec. I have also added JavaMail functionality as an alternative to sendmail. It works great and as expected.Sounds like a reasonable solution.
Note however that PL/SQL itself can send email. And PL/SQL can call unix sendmail too.
However myself I would have done it in java with JavaMail.

[JNI Beginner] GC of Java arrays returned by the native code

Hello all,
I am beginning with JNI, to integrate a C library that pilots an industrial equipment, into a java UI. This library enables to exchange various proprietary PDUs (protocol data units), with the equipment, up and down (request/replies). Both requests and replies are arrays of bytes (+char*+).
"Request" byte arrays are constructed by Java code, which passes them to the JNI code that glues with the lib. "Reply" byte arrays are returned to the Java code, which analyzes them.
The "return reply" part is very similar to this [tutorial example|http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jniexamp.html] , which returns bytes read from a file. However there's something I don't understand with regard to garbage collection of the returned byte array:
- in this stock example, the C code creates a Java byte array fills it, and simply returns it (example code stripped to highlight only the parts relevant to my question):
    jByteArray=(*env)->NewByteArray(env, size);
    (*env)->SetByteArrayRegion(env, jByteArray, 0, size, (jbyte *)sourceBytes);
    return (jByteArray);What will happen to this Java array (jByteArray) with regard to garbage collection?
- if it's no more referenced (the example Java code just systemouts it and forgets it), will it be eligible to GC?
- if it is referenced by a Java variable (in my case, I plan to keep a reference to several replies as the business logic requires to analyze several of them together), do regular Java language GC rules apply, and prevent eligibility of the array to GC as long as it's referenced?
That may sound obvious, but what mixes me up is that the same tutorial describes memory issues in subsequent chapters: spécifically, the section on "passing arrays states that:
[in the example] the array is returned to the calling Java language method, which in turn, garbage collects the reference to the array when it is no longer usedThis seems to answer "yes" to both my questions above :o) But it goes on:
The array can be explicitly freed with the following call:
{code} (*env)-> ReleaseByteArrayElements(env, jByteArray, (jbyte *)sourceBytes, 0);{code}Under what circumstances would one need to explicitly free jByteArray when it's about to be returned to the Java calling method? Or does this sentence apply to completely different situations (such as, when the array is +not+ returned as is to a Java method)?
The tutorial's next section has a much-expected +memory issues+ paragraph, from which I quote:
By default, JNI uses local references when creating objects inside a native method. This means when the method returns, the references are eligible to be garbage collected.I assume this means, +unless the references are assigned, in the Java code, to a Java variable+, right?
If you want an object to persist across native method calls, use a global reference instead. A global reference is created from a local reference by calling NewGlobalReference on the the local reference.I assume this enables the C code to maintain a global reference to a java object even if it's not referenced anymore from the Java variables, right?
I also checked the [JNI specification|http://download-llnw.oracle.com/javase/6/docs/technotes/guides/jni/spec/design.html#wp1242] , but this didn't clear the doubt completely:
*Global and Local References*
The JNI divides object references used by the native code into two categories: local and global references. Local references are valid for the duration of a native method call, and are automatically freed after the native method returns. Global references remain valid until they are explicitly freed.
Objects are passed to native methods as local references. All Java objects returned by JNI functions are local references. The JNI allows the programmer to create global references from local references. JNI functions that expect Java objects accept both global and local references. A native method may return a local or global reference to the VM as its resultAgain I assume the intent is that Global references are meant for objects that have to survive across native calls, regardless of whether they are referenced by Java code. But what worries me is that combining both sentences end up in +All Java objects returned by JNI functions are local references (...) and are automatically freed after the native method returns.+.
Could you clarify how to make sure that my Java byte arrays, be they allocated in C code, behave consistently with a Java array allocated in Java code (I'm familiar already with GC of "regular" Java objects)?
Thanks in advance, and best regards,
J.

jduprez wrote:
Hello all,
I am beginning with JNI, to integrate a C library that pilots an industrial equipment, into a java UI. This library enables to exchange various proprietary PDUs (protocol data units), with the equipment, up and down (request/replies). Both requests and replies are arrays of bytes (+char*+).
"Request" byte arrays are constructed by Java code, which passes them to the JNI code that glues with the lib. "Reply" byte arrays are returned to the Java code, which analyzes them.
The "return reply" part is very similar to this [tutorial example|http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jniexamp.html] , which returns bytes read from a file. However there's something I don't understand with regard to garbage collection of the returned byte array:
- in this stock example, the C code creates a Java byte array fills it, and simply returns it (example code stripped to highlight only the parts relevant to my question):
    jByteArray=(*env)->NewByteArray(env, size);
(*env)->SetByteArrayRegion(env, jByteArray, 0, size, (jbyte *)sourceBytes);
return (jByteArray);What will happen to this Java array (jByteArray) with regard to garbage collection?It will be collected when it is no longer referenced.
The fact that you created it in jni doesn't change that.
The array can be explicitly freed with the following call:
(*env)-> ReleaseByteArrayElements(env, jByteArray, (jbyte *)sourceBytes, 0);Under what circumstances would one need to explicitly free jByteArray when it's about to be returned to the Java calling method? Or does this sentence apply to completely different situations (such as, when the array is not returned as is to a Java method)?
Per what the tutorial says it is either poorly worded or just wrong.
An array which has been properly initialized it a just a java object. Thus it can be freed like any other object.
Per your original question that does not concern you because you return it.
In terms of why you need to explicitly free local references.
[http://download-llnw.oracle.com/javase/6/docs/technotes/guides/jni/spec/design.html#wp16785]
The tutorial's next section has a much-expected memory issues paragraph, from which I quote:
By default, JNI uses local references when creating objects inside a native method. This means when the method returns, the references are eligible to be garbage collected.I assume this means, unless the references are assigned, in the Java code, to a Java variable, right?As stated it is not precise.
The created objects are tracked by the VM. When they are eligible to be collected they are.
If you create a local reference and do NOTHING that creates an active reference elsewhere then when the executing thread returns to the VM then the local references are eligible to be collected.
>
If you want an object to persist across native method calls, use a global reference instead. A global reference is created from a local reference by calling NewGlobalReference on the the local reference.That is not precise. The scope is the executing thread. You can pass a local reference to another method without problem.
I assume this enables the C code to maintain a global reference to a java object even if it's not referenced anymore from the Java variables, right?
It enables access to it to be insured across multiple threads in terms of execution scope. Normally you should not use them.

How to call a C sort function to sort a Java Array.

My name is David, I'm interning this summer doing some High Performance Computing work. I'm significantly out of my comfort zone here; I am primarily a network/network security geek, not a programming guy. I took one Java based class called problem solving with programming where we wrote like 3 programs in Java and did everything else in pseudocode and using a program called Alice http://www.alice.org/ to do things graphically. Learned basically no actual programming syntax. Also have done some self-taught perl, but only through one book and I didn't finish it, I only got about half way through it. So my expertise in programming are pretty much null.
That being said, I currently am tasked with having to figure out how to make JNI work... specifically at this time I am tasked with writing an array in Java, and designing a C program that can be called by means of JNI to sort the array. I have chosen to work with the Merge Sort algorithm. My method of coding is not one where I write the entire thing from scratch, I don't particularly have a need to master languages at this point, rather I just need to make them work. I am interested in learning, but time is of the essence for me right now. So thus far what I have done is take sample codes and tweak them to meet my purpose. However, I currently am unable to make things work. So I am asking for help.
I am going to paste 3 codes here, the first one will be my basic self-written instructions for JNI (Hello World Instructions), the second one will be my Java Array, and the third one will be my MergeSort function. I am not asking for you to DO my work for me by telling me how to manipulate my code, but rather I am asking for you to send me in the direction of resources that will be of some aid to me. Links, books (preferrably e-books so I don't have to go to a library), anything that you can send my direction that may help will be deeply appreciated. Thanks so much!
JNI Instructions:
/*The process for calling a C function in Java is as follows:
1)Write the Java Program name. Eg. HelloWorld.java
2)Compile it: javac HelloWorld.java
3)Create a header file: javah -jni HelloWorld
4)Create a C program eg. HelloWorld.java
5)Compile the C program creating a shared library eg. libhello.so (My specifc command is cc -m32 -I/usr/java/jdk1.7.0_05/include -I/usr/java/jdk1.7.0_05/include/linux -shared -o libhello.so -fPIC HelloWorld.c
6) Copy the library to the java.library.path, or LD_LIBRARY_PATH (in my case I have set it to /usr/local/lib.
7)Run ldconfig (/sbin/ldconfig)
8)Run the java program: java HelloWorld. */
//Writing the code:
//For the HelloWorld program:
//In java:
//You need to name a class:
class HelloWorld {
//You then need to declare a native method:
public native void displayHelloWorld();
//You now need a static initializer:
static {
//Load the library:
System.loadLibrary("hello");
/*Main function to call the native method (call the C code)*/
public static void main(String[] args) {
new HelloWorld().displayHelloWorld();
//In C:
#include <jni.h> //JNI header
#include "HelloWorld.h" //Header created by the javah -jni command parameter
#include <stdio.h> //Standard input/output header for C.
//Now we must use a portion of the code provided by the JNI header.
JNIEXPORT void JNICALL
Java_HelloWorld_displayHelloWorld(JNIENV *env, jobject obj)
//Naming convention: Java_JavaProgramName_displayCProgramName
    printf("Hello World!\n");
    return;
}Java Array:
class JavaArray {
     private native int MergeSort(int[] arr);
     public static void main(String[] args)
         int arr[] = {7, 8, 6, 3, 1, 19, 20, 13, 27, 4};
     static
         System.loadLibrary("MergeSort");
}Hacked and pieced together crappy C Merge Sort code:
#include <jni.h>
#include <stdio.h>
#include "JavaArray.h"
JNIEXPORT jint JNICALL
Java_JavaArray_MergeSort(JNIEnv *env, jobject obj, jintArray arr[],jint low,jint mid,jint high)
   jint i,j,k,l,b[10];
l=low;
i=low;
j=mid+1;
while((l<=mid)&&(j<=high))
    if(arr[l]<=arr[j])
       b=arr[l];
l++;
else
b[i]=arr[j];
j++;
i++;
if(l>mid)
for(k=j;k<=high;k++)
b[i]=arr[k];
i++;
else
for(k=l;k<=mid;k++)
b[i]=arr[k];
i++;
for(k=low;k<=high;k++)
arr[k]=b[k];
void partition(jint arr[],jint low,jint high)
jint mid;
if(low<high)
mid=(low+high)/2;
partition(arr,low,mid);
partition(arr,mid+1,high);
sort(arr,low,mid,high);

You're doing OK so far up to here:
Java_JavaArray_MergeSort(JNIEnv *env, jobject obj, jintArray arr[],jint low,jint mid,jint high)This is not correct. It is not what was generated by javah. It would have generated this:
Java_JavaArray_MergeSort(JNIEnv *env, jobject obj, jintArray arr,jint low,jint mid,jint high)A 'jintArray' is already an array, embedded in an object. You don't have an array of them.
So you need to restore that, and the header file, the way 'javah' generated them, then adjust your code to call GetIntArrayElements() to get the elements out of 'arr' into a local int[] array, sort that, and then call ReleaseIntArrayElements() to put them back.

How to connect Java and Microsoft SQL Server 2000

hi,
could anyone please teach me how to connect Java and SQL Sever 2000?? if possible could you guys provide me with an example??? i could hardly find any relevant resources about it...
Thanks ~!

thanks for the information...
by the way hv any working module on it?? i'm new to
both Java and Microsoft SQL Server... Thanks againFirst things first... you should read this:
http://java.sun.com/docs/books/tutorial/jdbc/
This is microsofts official JDBC Driver: http://www.microsoft.com/sql/downloads/jdbcregister.asp
Install it and the documentation has some usage examples

Java extension for SQL Developer 2.1 (SqlEditor)

Hello,
we are developing a java extension for SQL Developer. It was working fine in version 1.5.5 but it seems that some of the java classes were changed in version 2.1 so it does not any more. In the SQL editor, we want to have a context menu action that gets the selected SQL statement and calls a database function with it as an argument. Our code looks like
@RegisteredByExtension("our.developer.extension")
public final class OurCommand extends Command {
public int doit() {
SqlEditor sqlEditor = (SqlEditor)getContext().getView();
String query = sqlEditor.getView().getSqlStatement();
sqlEditor.executeSql(query, "");
//or
//sqlEditor.getView().scriptRunner(query);
Unforunately, in SQL Developer 2.1 the class oracle.dbtools.sqlworksheet.sqlview.SqlEditor does not exist. Does anybody know how to write this example for version 2.1? Is there an API documentation (alas, [http://wiki.oracle.com/page/SDK+2.0] is an empty article)?
BTW, does anybody know how to open the dialog for connecting to a database when sqlEditor.getConnection() is null?

I got it to work using a BASIC call instead of my normal TNS call.
We use MS SMS to package the Oracle client and SQL Developer and push it out to users so we don't have people visiting desktops. Also, we use OID to store the entries instead of a tnsnames file so that we don't have to maintain a TNSNAMES file.
I am testing 2.1 as we would eventually upgrade when it goes GA.
2.1 seems to be built on Oracle 11g. Issue will be that since 99% of our databases are 10gr2 as well as 100% of our client population will be be forced to upgrade the Oracle client to use 2.1 as we do today without lots of changes for the end user?
We don't broadcast the information the average user requires for a BASIC connection so that is out for non technical users..
We have SQL Developer 1.5.5 right now and this is not and issue.
Hopefully, this will be resolved during EAI for 2.1.

Java arrays contiguous in memory?

are java arrays always contiguous in memory? or how does java save his arrays?
i need to know because i wrote an algorithm with a lot of array length changing, and i wonder if it consumes a lot or not, maybe java uses virtual memory arrays like those here :
http://developers.sun.com/solaris/articles/virtual_memory_arrays.html
any answer is welcome,
Nck.

The internal layout of objects (including arrays) is explicitly undefined by the JVM standard:
http://java.sun.com/docs/books/vmspec/2nd-edition/html/Overview.doc.html#16066
So you can't assume that arrays are implemented in any particular way on any given JVM. But the Get<Type>ArrayElements JNI functions can give you a clue about it for the current JVM.
But I don't really understand the background of the question. What do you mean by "a lot of array length changing"? Java arrays can't be resized, whether from bytecode or JNI.
-slj-

Java Array Out Of Bounds Problem

In order to conduct an experiment in java array sorting algorithm efficiency, i am attempting to create and populate an empty array of 1000 elements with random, unique integers for sorting. I've been able to generate and populate an array with random integers but the problem is - for whatever size array I create, it only allows the range of numbers to populate it to be the size of the array, for instance, an array of size 3000 allows only the integer range of 0-3000 to populate it with or I get an out of bounds exception during runtime. How can you specify an integer range of say 0-5000 for an array of size < 5000? Any help is appreciated.

Another approach is to fill the array with an
arithmetic sequence, maybe plus some random noise:
    array[i] = i * k + rand(k);or some such, so they are unique,
and then permute the array (put the elements
s in random order)
    for (i : array.length) {
transpose(array, array[rand(i..length)]); }
Along those lines, java.util.Collections.shuffle can be used to randomly shuffle a List (such as an ArrayList). Create an ArrayList with numbers in whatever range is needed. Then call java.util.Collections.shuffle(myArrayList). [It is static in Collections--you don't need to [and can't] create a Collections object.]

Q: 2-dim java Array to SQL rowtype?

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