How do u automatically generate a primary key using JDBC?

ok, basically i'm given a simple schema
with 5 fields, one of these are made as a constraint made for primary keys.
I am programming under Oracle, using JDBC, and everytime i insert a new record into the table using an INSERT statement it says it cant make the id null, well yeah, then how exactly do i make it generate a new ID?
Thanks guys.

In the table schema, the cid field is a INTEGER
type.
Ok i must of accidentally typed an extra digit, it's
working now hmmm but i'm starting from this digit now
: 1000000016
If i go more higher and it truncates again, is there
anyway to fix that?No. You can however write your code to verify it.
Noting of course that the problem will next occur after 1 billion records have been added. So I would question at what rate you think that that table is going to grow.
Of course you could create your own id but that would require modifying the table.

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Problem in generating the Primary Key

Hi All ,
I am trying to persist an object and also generating the primary key using a default sequence . But the problem is that the Primary key is getting incremented by 2 instead of 1 . My code looks like this :
import java.util.HashMap;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.PersistenceUnit;
public class entityCaller {
//     @PersistenceContext(unitName="testApp" ,type=PersistenceContextType.EXTENDED)
     EntityManager em;
//     @PersistenceUnit(unitName="testApp")
     EntityManagerFactory emf ;
     public void persistEntity( String Name , int Age ) {
          EntityManagerFactory emf =
          Persistence.createEntityManagerFactory("testApp", new HashMap());
          em = emf.createEntityManager();
          EntityTransaction entityTransaction = em.getTransaction();
     Tab1 oBJTab1 = new Tab1();
//      oBJTab1.setId(Age);
     oBJTab1.setVal(Name);
          try{
               System.out.println("Making object");
               em.persist(oBJTab1);
               System.out.println("Done");
               System.out.println("Making object2");
               System.out.println("Entered the Values");
          }catch (Exception e) {
               e.printStackTrace();
          }finally{
          em.close();
     public static void main(String[] args) {
          entityCaller caller = new entityCaller();
          caller.persistEntity("DoAgain7",2);
My persistence.xml looks like this :
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="testApp">
<provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
<class>Tab1</class>

<properties>

<property name="toplink.jdbc.driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="toplink.jdbc.url" value="jdbc:oracle:thin:@127.0.0.1:1521:XE"/>
<property name="toplink.jdbc.user" value="system"/>
<property name="toplink.jdbc.password" value="jlkklkj"/>


</properties>
</persistence-unit>
</persistence>
Please provide me with some pointer as to know where the things are going wrong.

If you generated your original schema using toplink.ddl-generation, then later dropped it and created it then you should keep in mind the sequence table does not get dropped. This can lead to an initially 'empty' database with a PK sequence starting at '2' if you have one persistence unit and one entity. Can you steadily duplicate this or did you just notice that your persist started with an key of '2'? Just a thought.

How to generate the primary key item automatically in form region?.

Hi,
The primary key item is generated automatically in report region.I already give the pl/sql function for generating of primary key.but I want to generate the primary key value automatically in form region only?.how to do this?.Pls help me..
Thanks and Regards.

One of the guidelines when selecting column for a primary key is:
Choose a column whose data values are never changed. A primary key value is only used to identify a row in the table, and its data should never be used for any other purpose. Therefore, primary key values should rarely or never be changed.
Cheers!

Generate the primary key automatically while records are saved

Hi experts,
I need to generate the primary key of a custom table automatically when a new record is saved. Pleas help asap. Urgent.

Hi Rob and vikas,
   Thanks for your answers . Both of the solutions you mentioned were syntactically correct and activated but they are not populating the numbers.In case of Rob's soultion I guess I am not able to catch the return number. I am giving the code below. So Please look into it,
FORM gen_manu_siteid .
data : number type zsiteid value 155.
CALL FUNCTION 'NUMBER_GET_NEXT'
EXPORTING
    NR_RANGE_NR                   = '02'
    OBJECT                        = 'zmanusite'
    QUANTITY                      = '1'
SUBOBJECT                     = ' '
TOYEAR                        = '0000'
IGNORE_BUFFER                 = ' '
IMPORTING
    NUMBER                        = number
QUANTITY                      =
RETURNCODE                    =
EXCEPTIONS
INTERVAL_NOT_FOUND            = 1
NUMBER_RANGE_NOT_INTERN       = 2
OBJECT_NOT_FOUND              = 3
QUANTITY_IS_0                 = 4
QUANTITY_IS_NOT_1             = 5
INTERVAL_OVERFLOW             = 6
BUFFER_OVERFLOW               = 7
OTHERS                        = 8
*IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
*ENDIF.
ztblqm_sqm-zsiteid = number .
ENDFORM.                    " gen_manu_siteid
When this did not work. i tried Vikas's soution and the code i used for this is
FORM gen_manu_siteid .
data : w_count like ztblqm_sqm-zsiteid,
       e_wa like ztblqm_sqm occurs 0 with header line.
select max( zsiteid ) from ztblqm_sqm into w_count .
w_count = w_count + 1.
e_wa-zsiteid = w_count.
modify ztblqm_sqm from e_wa.
ENDFORM.                    " gen_manu_siteid
Please look into this and give me a solution.
NB: I have tried them at the event 01 include.

Automatic Creation of primary key at the time of creating entries

Hi All,
I have a requirement to generate the primary key automatically at the time of creating entries. I have managed to do so by writing an event code for the maintainance object in SE54.
However called only when I create entries throught the Maintainance View.
It does not get called when I write an insert statement in the program.
Please suggest a way to achieve this.
Thanks in advance,
Archana.

for assigning the primary key while using insert statement, write a piece of code to get the last pk value, increment it by 1 and then assign this value to the pk field of the next record while inserting. if you are using a fn mod to insert values, just have this piece of code right before the insert query. a better way would be to use a GUID which will be unique globally. there is a fn mod GUID_CREATE which you can use to generate GUID. i don't think there is a way to automate this while making entries using se11, unless you change the code that actually creates the entry in the database.

About Automatic generation of Primary key

I have created one Z table. Its composite primary keys are vkorg
and Sales Representive Number. I have to assign Sales Representive number
through system. How it should be done?
Message was edited by:
Nilesh Vakil

Nilesh , You asked the Same question in ABAP General
Please Refer the link.
Re: About Automatic Generation of Primary key
Regards
Rusidar S
Message was edited by:
Rusidar Subramani

Any easy way to generate unique primary key for database table?

I'm currently playing with the J2EE reference implementation from Sun which comes with the IBM Cloudscape database. This Cloudscape database supports the use of an AutoIncrement field.
First question: Can I use CMP and assume that the database will generate a proper key for me? Anyone tried it out successfully before?
Also, based on what I've heard so far, it seems that generating database primary key is not really well-supported by J2EE using CMP in that a lot of J2EE developers have to resort to workarounds like using a session bean, JDBC and (1) some seed numbers for ID implanted in the database itself (as in the J2EE tutorial DukesBankApp example) or (2) using the SQL MAX aggregation command + 1. Usign seed number is contradictory to good database design and using MAX is dangerous for heavy traffic application if 2 beans try to insert themselves into the database at the same time (synchronizarion problem).
Anyway I find it dumb that we still have to go back to JDBC and SQL which was the reason why the concept Entity Bean was introduced; to make database persistence transparent! Now it seems that J2EE makes it worse and more troublesome than before.
Second Question: Is there any easy (hopefully transparent/automatic) way of generating primary key ID?

if you want to rely on your container or database then go hard, will probably be faster.
to make a cross container/db soln I used a CMP Entity bean called Sequence with one field for uid
I use one instance and increment the field each time.
To do the logic, I have a utils class with static method, no need for session bean overhead
I reckon this approach is OK considering all things

Generating a Primary Key WITHOUT using a Sequence Number

Hi Everyone:
I am trying to generate a primary key without using a sequence number or row count. What the user wants is the maximum value of the highest primary key already in the row set plus 1.
For example, this is a Oracle Table (eg. named BatchSubmit) used to initiate batch job submission, and the primary key is an integer named "Runcard_Number". If there are 4 rows in this table and the Runcard_Numbers are 2, 6, 8 & 12, then the next generated Runcard_Number would be 13.
I have looked throughout this forum and see how to generate numbers using a DBSequence, but the user does not want that. The numbers mean something to them, and they don't want them randomly assigned other than the max in the rowset plus 1. To do it in SQL it would be - select max(Runcard_Number) + 1 from BatchSubmit;
I have been looking at using a hasnext loop and moving the maximum value to the new Runcard_Number, but I am very new to JHeadstart/JDev and I do not know where to put this. I am assuming the BatchSubmitImpl.java, but I'm not sure where to put it or which method to utilize
I would appreciate any assistance.
Mary
U o Windsor

Mary you're in luck, 'cause, I've been playing with the same thing, these days and found that..
You can do that in two ways (that I know):
- by calling a stored function that does max+1 (you can look it up in Dev's guide for Forms&4GLDevs 10g chapter 25.5 Invoking Stored Procedures and Functions)
- by calling hardcoded or dinamicaly written statement, that does the same
public Number callStatement(String stmt)
Number id = new Number(0);
Row idRow = getDBTransaction().createViewObjectFromQueryStmt(stmt).next();
if(idRow != null)
Object o = idRow.getAttribute(0);
if(o != null)
if(o instanceof Number)
id = (Number)o;
else
throw new JboException("Conversion error!");
return id;
You should call it in
protected void doDML(int operation, TransactionEvent transactionEvent)
switch (operation)
case DML_INSERT:
// call here
super.doDML(operation, transactionEvent);
break;
case DML_UPDATE:
super.doDML(operation, transactionEvent);
break;
case DML_DELETE:
super.doDML(operation, transactionEvent);
break;
Enjoy!
S. Julijan

If I have an EntityBean that mappes to two tables within one database, when I create that EJB, whoes reponsibilty to generate the primary key in database table? The RDBMS or EJB?

If I have an EntityBean that mappes to two tables within one database, when I create
that EJB, whoes reponsibilty to generate the primary key in database table? The
RDBMS or EJB?
Thanks,
JW

Refer to http://e-docs.bea.com/wls/docs81/faq/ejb.html/#257430
"Jingwei Zhang" <[email protected]> wrote:
>
If I have an EntityBean that mappes to two tables within one database,
when I create
that EJB, whoes reponsibilty to generate the primary key in database
table? The
RDBMS or EJB?
Thanks,
JW

How to impliment a auto increamenting primary key feature in ADF ??

How to implement an auto incrementing primary key feature in ADF ( With out using database Triggers)
Edited by: Dinil Mithra on Apr 24, 2009 2:28 AM
Edited by: Dinil Mithra on Apr 24, 2009 2:59 AM

Dinil,
Create a sequence in the database.
Read section 4.11.5 of the Fusion Developer's Guide - which has sample code to get the next sequence value from Java without a database trigger.
John

How I can automatically generate purchase orders in SRM?

Hi Gurus,
When I create a Shopping Cart (SC), in "Source of Supply" tab I can select a contract as source of supply.
How I can automatically generate a purchase order (PO) with contract data (vendor, price, etc.)? So that the operational purchaser does not have to enter the system to generate the PO.
In ERP (ECC 6.0) exists ME59N transaction, is there something similar in SRM?
The system is:
Component software: SRM_SERVER
Release: 700
Level: 0008
Support package: SAPKIBKV08
Thanks in advance and best regards,
Alonso Valenzuela

Hi,
Like ME59, there is no option available to create a PO automatically in SRM. If you want you can achieve this in 3 ways.
1. Creating SC Via CATALOGS ( In this case after approval PO will be created directly and most of the cases PO will be transferred to ECC i.e in SRM that will be in ordered status.
2. You can select the sourcing relevant indication as 'Never Carried out' (Here if you created a SC without source of supply then all such SC's will be converted into Save status PO's.
3. Do the modification in DOC_CHECK_BADI to force all SC converting to PO.
However in Case 2 & 3, still buyer's team manual intervention will be more, then need to update the PO with source of supply.
Regards,
Govardhan.

How many primary keys use in one table

Hi,
Please help me. Maximum How many primary keys use with in one table
Regards,
Sunil Kumar.T

Hi,
For my knowledge, It depends on the Database & version u r working.. Right..
This is a sample description what I seen for a Database...
Technical Specification of SAP DB Version 7.4
Description                            Maximum Value
Database size                    32 TB (with 8 KB page size)
Number of files/volumes per database64...4096, specified by a configuration parameter
File/volume size (data)      518 ...8 GB (dependent on operating system limitations)
File/volume size (log)1      6 TB (dependent on operating system limitations)
SQL statement length>= 16 KB (Default value 64 KB, specified by a system variable)
SQL character string lengthSpecified by a system variable
Identifier length                32 characters
Numeric precision              38 places
Number of tables unlimited
Number of columns per table (with KEY) 1024
Number of columns per table (without KEY) 1023
Number of primary key columns per table 512
Number of columns in an index 16
Reward Points if useful

Composite Primary Key using cmp

How can an Entity Bean with Composite Primary Key using Container Managed Persistance (CMP) be Deployed using in WebLogic Server 8.1
pls help me

Your text is a bit confusing, but I think the answer is yes (it can be used). However, it would help to see the DDL that you are using (or that you propose to use) to avoid any misunderstandings. And please be specific about whether you are referring
to COLUMNS that are part of a primary key versus the primary key itself (whether it is composed of one column or multiple columns).
Lastly, why not just try it and see.

How can I automatically close a dialog box using Javascript after I click the OK button to submit it?

How can I automatically close a dialog box using Javascript after I click the OK button to submit it? I don't want to have to X out of the dialog box after I am done.
Thanks
Linda

JS can not interact with open dialogs in any way, unless it's a dialog
created in JS using the Dialog object.
On Thu, Jul 24, 2014 at 11:13 PM, lindaeliseruble <[email protected]>

How to examine the generated SQL statement in Receiver JDBC Adapter

I have been searching this forum how to display te generated sql statement (by the jdbc receiver adapter).
The only suggestion is to use RWB, but I was unable to find any details about how to do so.
Any help is appreciated

Hi,
To add, u can see the SQL Statements in Audit log of RWB.
Select Message Monitoring-> Adapter Engine. choose ur entry and click on Details option button, u can see the SQL Statements in Audit Log.
Regards,
Sudharshan
Message was edited by:
Sudharshan Aravamudan

How do u automatically generate a primary key using JDBC?

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