A challenging primary key generation problem..
Hi !
I have the following problem (this is in theory, not (yet) in practice):
I have this set of entities with its respective primary keys in the database.. 0,1,2,3,4,5,...............,N
In a certain moment in the future X, a transaction deletes record (for example) n < N.
In a certain moment in the future Y after X, a transaction persists new entity Q.
What primary key does it get ?
Is it Q=n or is it Q=N+1 ?
In case the latter, how can I achieve the former ? Is there JPA specified way to do it, or I shall use the "stupid" way.
I.e. In general I want the gaps in the sequence (caused by deletion of entities), to be filled with the newly persisted ones.
All suggestions are welcome :)
P.S. If someone knows the actual difference between the PrimaryKeyGenerationTypes in JPA (SEQUENTIAL, IDENTITY, etc...) please, tell me :P
Edited by: javaUserMuser on Aug 7, 2008 5:37 PM
javaUserMuser wrote:
Well 2^63 = 9 billion billion.. well, thats a lot really. but anyway using the gaps is preferable for me ;]You've still said nothing to support this view except "because I said so". I don't think you need it. Here's why:
Assume there are 2^63 = 9 billion billion keys available to you. If your application consumes them at the rate of 1 key per millisecond, it'll take you ~36 billion years to exhaust all those keys. Since science estimates the age of the universe as 13-14 billion years, and creationists say it's 6000 years, I'd say you're safe if you throw away a key or two.
You know your app. Adjust accordingly. Calculate how fast you'd have to consume keys to exhaust them all in 100 years for fun and compare it to your real requirements.
Well there can be involved more than one db... In general how does a rdbms scale horizontally ? Can N-count physical nodes serve one logical DB ?Depends on the product. Consult the database you're using. Which product will you use?
What kind of them ?See the calculation above.
>
I got what those IDENTITY etc. things mean, but.... anyway how do those differ not in the perspective of the database, rather of that of the developer <-- that is my question :PAs a developer, it means that I'd have to use a different id generator scheme in my configuration.
In general, I like your posts :) Discussion is the mother of progressThank you, I'm glad you find them to be helpful.
%
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at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)I am not sure whether I understand your question.
The 'NamedSequenceTable' method is independent of data base type.
<from-docs>
Create a table named SEQUENCE to hold the current primary key value. The
table consists of a single row with a single column, as defined by the
following statement:
CREATE table_name (SEQUENCE int)
INSERT into table_name VALUES (0)
</from-docs>
Then, you can add the following in the DD -
<automatic-key-generation>
<generator-type>NamedSequenceTable</generator-type>
<generator_name>table_name</generator-name>
<key-cache-size>100</key-cache-size>
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The PK type should be set to java.lang.Integer or java.lang.Long
--Sathish
<Panduranga Swamy> wrote in message news:[email protected]..
Hi,
With named sequecne table,I am able to develop the application. What I
wanted is Say Table 1 having Identity column as Primary key in the table
Pointbase database.
With Automatic primary key generation in Deployment descriptor, We
generally specify SQL_SERVER or Named Sequencetable for Primary key
generation.
For pointbase database, I dont know how to configure this?
Could you help me in this regard,
Thanks,
Pandu -
According to article "Generating Primary Key Values in CMP Beans" (http://www.netbeans.org/kb/41/generated-primary-keys.html) you can specifiy automatic primary key generation.
The following fragment describes a key issue when you have a existing database schema.
If the database schema is not created during deployment, the primary key column in the mapped table must be of type NUMERIC with a precision of 19 or more, and must not be mapped to any CMP field. The Sun Java System Application Server generates unique values for the primary key column at runtime.
In the used sample for how to set up a MySql database the creation of the customer table must be as follows:
CREATE TABLE customer (
id BIGINT(19) NOT NULL auto_increment, -- this column will be automat. generated
lastName varchar(25) NOT NULL,
firstName varchar(30) default NULL,
PRIMARY KEY (id));
My question is:
Is it nescesary to have the field id to be decleared auto incremented?
The first fragment says that the AS will create new values for the primary key. Or does the generation of primary keys only work if the pk field in the database table is auto incremented by the database?
Please help. Thanks!
Johan.Hello Johan,
no, as i remember it does not work if you specify the id column as auto_increment. The J2EE bean container does manage the generation of the primary key, so the database must have a column type int(19) or bigint and primary key, not more.
Hope this helps, more information is in the J2EE documentation from Sun, page 1012.
Kind regards,
marc. -
Error in primary key generation
Hello,
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ntime]Saw rolled back tx=TransactionImpl:XidImpl [FormatId=257, GlobalId=c40//2,
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essimisticEJBLock.java:339)
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PessimisticEJBLock.java:211)
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ssimisticEJBLock.java:159)
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rceptor.java:107)
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torCMT.java:291)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:9
8)
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java:130)
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lContainerInvoker.java:301)
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java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(S
tatelessSessionContainer.java:660)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invo
ke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(Stat
elessSessionInstanceInterceptor.java:77)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInte
rceptor.java:107)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxIntercep
torCMT.java:237)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:9
8)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.
java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:208)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContai
ner.java:313)
at org.jboss.ejb.Container.invoke(Container.java:738)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:
383)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
60)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:701)
at java.lang.Thread.run(Thread.java:536)
15:57:23,747 ERROR [LogInterceptor] EJBException, causedBy:
java.lang.RuntimeException: Transaction marked for rollback, possibly a timeout
at org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.waitForTx(QueuedP
essimisticEJBLock.java:339)
at org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.doSchedule(Queued
PessimisticEJBLock.java:211)
at org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.schedule(QueuedPe
ssimisticEJBLock.java:159)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockIntercep
tor.java:103)
at org.jboss.ejb.plugins.EntityCreationInterceptor.invoke(EntityCreation
Interceptor.java:69)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInte
rceptor.java:107)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxIntercep
torCMT.java:291)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:9
8)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.
java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:208)
at org.jboss.ejb.EntityContainer.invoke(EntityContainer.java:493)
at org.jboss.ejb.plugins.local.BaseLocalContainerInvoker.invoke(BaseLoca
lContainerInvoker.java:301)
at org.jboss.ejb.plugins.local.EntityProxy.invoke(EntityProxy.java:38)
at $Proxy34.getValueAfterIncrementingBy(Unknown Source)
at com.gmi.mportal.SequenceSessionBean.getNextSequenceNumber(SequenceSes
sionBean.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)I'm experiencing the exact same problem.
I do have a piece of information to add, though.
This problem only occurs when I run the code (generating a PK for a given table) the FIRST time. Once a row exists in the sequence table for a table, the code works.
On the first run, the problem occurs after the row is inserted into the table. If the row already exists, you're all set.
Still a problem, but at least you can work around it by prepopulating your sequence table.
--- Matt -
Primary Key Causing Problem in Interval Partition Exchange
DB : 11.2.0.2
OS : AIX 6.1
I am getting the problem while exchanging data with interval partitioned table. I have a interval partitioned table and a normal staging table having data to be uploaded.
Following are the steps i am doing.
SQL> CREATE TABLE DEMO_INTERVAL_DATA_LOAD (
ROLL_NUM NUMBER(10),
CLASS_ID NUMBER(2),
ADMISSION_DATE DATE,
TOTAL_FEE NUMBER(4),
COURSE_ID NUMBER(4))
PARTITION BY RANGE (ADMISSION_DATE)
INTERVAL (NUMTOYMINTERVAL(3,'MONTH'))
( PARTITION QUAT_1_2012 VALUES LESS THAN (TO_DATE('01-APR-2012','DD-MON-YYYY')),
PARTITION QUAT_2_2012 VALUES LESS THAN (TO_DATE('01-JUL-2012','DD-MON-YYYY')),
PARTITION QUAT_3_2012 VALUES LESS THAN (TO_DATE('01-OCT-2012','DD-MON-YYYY')),
PARTITION QUAT_4_2012 VALUES LESS THAN (TO_DATE('01-JAN-2013','DD-MON-YYYY')));
Table created.
SQL> ALTER TABLE DEMO_INTERVAL_DATA_LOAD ADD CONSTRAINT IDX_DEMO_ROLL PRIMARY KEY (ROLL_NUM);
Table altered.
SQL> SELECT TABLE_OWNER,
TABLE_NAME,
COMPOSITE,
PARTITION_NAME,
PARTITION_POSITION,
TABLESPACE_NAME,
LAST_ANALYZED
FROM DBA_TAB_PARTITIONS
WHERE TABLE_OWNER='SCOTT'
AND TABLE_NAME='DEMO_INTERVAL_DATA_LOAD'
ORDER BY PARTITION_POSITION;
TABLE_OWNER TABLE_NAME COM PARTITION_NAME PARTITION_POSITION TABLESPACE_NAME LAST_ANAL
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_1_2012 1 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_2_2012 2 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_3_2012 3 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_4_2012 4 USERS
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD VALUES (10,1,'12-MAR-2012',1000,90);
1 row created.
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD VALUES (11,5,'01-JUN-2012',5000,80);
1 row created.
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD VALUES (12,9,'12-SEP-2012',4000,20);
1 row created.
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD VALUES (13,7,'29-DEC-2012',7000,10);
1 row created.
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD VALUES (14,8,'21-JAN-2013',2000,50); ---- This row will create a new interval partition in table.
1 row created.
SQL> commit;
SQL> SELECT TABLE_OWNER,
TABLE_NAME,
COMPOSITE,
PARTITION_NAME,
PARTITION_POSITION,
TABLESPACE_NAME,
LAST_ANALYZED
FROM DBA_TAB_PARTITIONS
WHERE TABLE_OWNER='SCOTT'
AND TABLE_NAME='DEMO_INTERVAL_DATA_LOAD'
ORDER BY PARTITION_POSITION;
TABLE_OWNER TABLE_NAME COM PARTITION_NAME PARTITION_POSITION TABLESPACE_NAME LAST_ANAL
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_1_2012 1 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_2_2012 2 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_3_2012 3 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_4_2012 4 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO SYS_P98 5 USERS
SYS_P98 partition is added to table automatically.
SQL> CREATE TABLE DEMO_INTERVAL_DATA_LOAD_Y (
ROLL_NUM NUMBER(10),
CLASS_ID NUMBER(2),
ADMISSION_DATE DATE,
TOTAL_FEE NUMBER(4),
COURSE_ID NUMBER(4));
Table created.
SQL> INSERT INTO DEMO_INTERVAL_DATA_LOAD_Y VALUES (30,3,'21-MAY-2013',2000,12);
1 row created.
SQL> commit;
Commit complete.
Since, i need a partition in DEMO_INTERVAL_DATA_LOAD table, which can be used in partition exchange, so i create a new partition as below:
SQL> LOCK TABLE DEMO_INTERVAL_DATA_LOAD PARTITION FOR (TO_DATE('01-APR-2013','DD-MON-YYYY')) IN SHARE MODE;
Table(s) Locked.
SQL> SELECT TABLE_OWNER,
TABLE_NAME,
COMPOSITE,
PARTITION_NAME,
PARTITION_POSITION,
TABLESPACE_NAME,
LAST_ANALYZED
FROM DBA_TAB_PARTITIONS
WHERE TABLE_OWNER='SCOTT'
AND TABLE_NAME='DEMO_INTERVAL_DATA_LOAD'
ORDER BY PARTITION_POSITION;
TABLE_OWNER TABLE_NAME COM PARTITION_NAME PARTITION_POSITION TABLESPACE_NAME LAST_ANAL
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_1_2012 1 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_2_2012 2 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_3_2012 3 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO QUAT_4_2012 4 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO SYS_P98 5 USERS
SCOTT DEMO_INTERVAL_DATA_LOAD NO SYS_P102 6 USERS
SQL> ALTER TABLE DEMO_INTERVAL_DATA_LOAD
EXCHANGE PARTITION SYS_P102
WITH TABLE DEMO_INTERVAL_DATA_LOAD_Y
INCLUDING INDEXES
WITH VALIDATION;
ALTER TABLE DEMO_INTERVAL_DATA_LOAD
ERROR at line 1:
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITIONNow, if i disable/drop the primary key constraint, it works without any problem.
SQL> alter table DEMO_INTERVAL_DATA_LOAD disable constraint IDX_DEMO_ROLL;
Table altered.
SQL> alter table DEMO_INTERVAL_DATA_LOAD drop constraint IDX_DEMO_ROLL;
Table altered.
SQL> ALTER TABLE DEMO_INTERVAL_DATA_LOAD
EXCHANGE PARTITION SYS_P102
WITH TABLE DEMO_INTERVAL_DATA_LOAD_Y
INCLUDING INDEXES
WITH VALIDATION;
Table altered.
SQL> select * from DEMO_INTERVAL_DATA_LOAD partition (SYS_P102);
ROLL_NUM CLASS_ID ADMISSION TOTAL_FEE COURSE_ID
30 3 21-MAY-13 2000 12
SQL> select * from DEMO_INTERVAL_DATA_LOAD_Y;
no rows selectedPlease suggest.First, thanks for posting the code that lets us reproduce your test. That is essential for issues like this.
Because the primary key is global you will not be able to use
INCLUDING INDEXES
WITH VALIDATION;And you will need to add the primary key to the temp table
ALTER TABLE DEMO_INTERVAL_DATA_LOAD_Y ADD CONSTRAINT IDX_DEMO_ROLL_Y PRIMARY KEY (ROLL_NUM);The the exchange will work. You will need to rebuild the primary key after the exchange. -
CMP with Primary key generation in Oracle
I need to know how can I from my Entity Beans use Oracle sequences to automatically create my primary key.
I know that Weblogic lets to define with sequence to use in the deployment descriptor, but the problem is that I am using Websphere Application Server.
Does anyone have any suggestion doing this.
Very Thanks!!See if this link helps - http://theserverside.com/patterns/thread.jsp?thread_id=220
-
Primary key generation by insert trigger.
I have a table and wish to automatically create a unique sequence number for use as the primary key.
In PL/SQL I do something like this:
create sequence personnel_seq;
create or replace trigger personnel_insert
before insert on personnel
for each row
declare seqNo NUMBER;
begin
select personnel_seq.NextVal into seqNo from dual;
:new.vc_personnel_reference := seqNo;
end personnel_insert;
column personnel.vc_personnel_reference is the primary key of table personnel, and not null.
What's the recommended way to do something similar in BC4J?
At present I'm using the trigger but BC4J doesn't know it exists, and insists on a value for vc_personnel_reference being provided. It also insists on adding the primary key to the ViewObject's attributes.
I can provide a dummy value in ViewObjectRowImpl.insertRow() but this seems cumbersome.
Is there a better way?
In fact can I do this kind of thing entirely in BC4J without the trigger?
Tony.But be carefull with DBSequences.
There's a "problem" because the DBSequencs is a Domain and a "domained" field is not equal to any other field.
In that case if have an Entity with Id = 1 (where d comes out from a DbSequence) and You look for Id = n where n is a Number containing 1, You will not find Your record !!!
As 9.0.2.; I don't know in 9.0.3.
Bye
Tullio -
1-1 mapping Primary Key association problem
Hi, I have two tables Indiv (Id, col1, col2 ) and IndivExt(Id, col3)....where "Id" is the PKey in both the tables.
In TopLink, I have mapped
Indiv table --> IndivClass
IndivExt table --> IndivExtClass
class IndivClass{
Integer Id;
Integer col1;
Integer col2;
class IndivExtClass{
IndivClass oIndiv; // relation - one-to-one
Integer col3;
While running the app, there is an Integrity TopLink exception that says that IndivClass descriptor doesnt have IndivExt table in it.
So, I used advanced feature of multi-table info and created the Primary Key association between these two descriptors.
If I am right, This association assumes that there is a row in IndivExt for every row in Indiv...correct me if im wrong. I assume this coz of the kinda sql query it creates when im trying to read a IndivClass object. The sql query uses a join on both the tables.
But...For every row in Indiv table there MIGHT or MIGHT NOT be a row in IndivExt table.
So the sql that is formed will not return the required Indiv rows (in case there are no corresponding IndivExt rows).
How do I resolve this.
Thanks,
KrishnaHi James,
Thanx for that update.
So just for clarification...
Im going to remove the multi-table info.
And use normal foreign key reference,
and apply the patch...then the Integrity error
should not occur.
Right ?
One more question... If I also want to refer IndivExt from the Indiv object...then I would change my classes
to be like...
class IndivClass{
Integer Id;
Integer col1;
Integer col2;
IndivExt oIndivExt; //relation - one-to-one (rel2)
class IndivExtClass{
IndivClass oIndiv; // relation - one-to-one (rel1)
Integer col3;
and the mapping (for rel2) in IndivClass descriptor will use the same reference that was used by rel1...ie., a normal foreign key ref. Is that right ?
And also...Is there a bug number related to this issue and how do I get the patch ? Where can I download it from?
Thanks,
Krishna -
Database Deferred Primary Key generation
Does anyone know how to configure 9iAS J2EE/OC4J to defer the creation of the Primary to the Database? For example, I have a table that is mapped to a CMP bean and the primary key is generated by a trigger in the database. I want the bean to use this database generated value but I can't figure out how to make it happen. I have tried setting the <prim-key-class> to java.lang.Object but that doesn't appear to be enough to get 9iAS to figure out that the primary key field is to come from the database.
Regards,
Nigelyou should set in your entity object the attribute as DBSequence and then create a before insert trigger in the db table to get the pk from a sequence or so, something like:
CREATE OR REPLACE TRIGGER trigger_name
BEFORE INSERT
ON table_name
FOR EACH ROW
begin
select seq_name.nextval into :new.pk_id from dual;
end; -
Primary key field problem in DBSchema Wizard
Hi,
I am using Sun ONE studio 4 update 1, EE.
I have generated schema using the Database Schema Wizard.
The generated table representations does not recognise the primary key fields so I can not map my CMP to any table :-(
Is this a bug?
because I have generated schemas from 3 different databases (IBM, MySQL, SAP) and the tables have primary key fields.
When I get a connection in Runtime Pane under Database node, I can see the primary fields are highlighted with red color.
However, when I obtain the schema using, New->Database->Database Schema, there are no primary key fields generated.
Anyone have any ideas, work around?
Thanks
Tex...First, thanks for posting the code that lets us reproduce your test. That is essential for issues like this.
Because the primary key is global you will not be able to use
INCLUDING INDEXES
WITH VALIDATION;And you will need to add the primary key to the temp table
ALTER TABLE DEMO_INTERVAL_DATA_LOAD_Y ADD CONSTRAINT IDX_DEMO_ROLL_Y PRIMARY KEY (ROLL_NUM);The the exchange will work. You will need to rebuild the primary key after the exchange.
Maybe you are looking for
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I have a very large number of albums and songs in my copy of iTunes. I also have a very large number of diverse song lists. At some point, album art from different albums began appearing on my 160 Gb iPod's screen with songs from other albums by othe
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