Question

Ho to do row level lock of a oracle database table?

Asked by: cakurien

Here there are 4 different weblogic servers and trying to select and update one row in oracle 9i database..Here I want to do a row level lock using Hibernate.so that if one jvm has picked others cant update that

This is an urgent requirement please help and guide

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Asked On
2008-12-16 at 21:27:27ID23990962
Tags

java

,

hibernate

,

hibernate 3.0

,

ibm

,

weblogic server

,

9.1

Topics

BEA WebLogic Application Server

,

Oracle 9.x

Participating Experts
4
Points
500
Comments
6

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Answers

 

by: sujith80Posted on 2008-12-17 at 00:15:42ID: 23191488

Row level locking is done in oracle using a FOR UPDATE clause.
See the example, where SESSION1 locks the row and SESSION2 attempts a lock, which fails.

SESSION-1>select * from tbl1;
 
       VAL DT        USR_ID
---------- --------- --------------------
         5 17-DEC-08 TEST
        10 17-DEC-08 TEST
        20 17-DEC-08 TEST
        40 17-DEC-08 TEST
        50 17-DEC-08 TEST
 
SESSION-1>select * from tbl1 where val=5 for update nowait;
 
       VAL DT        USR_ID
---------- --------- --------------------
         5 17-DEC-08 TEST
 
 
*******************************************
 
SESSION-2>select * from tbl1 where val=5 for update nowait;
select * from tbl1 where val=5 for update nowait
*
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specified
                                              
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by: rajesh_balaPosted on 2008-12-17 at 04:23:59ID: 23192536

I doubt it could be achieved with hibernate. Atleast haven't seen anyone doing it in hibernate.

~Rajesh.B

 

by: sdstuberPosted on 2008-12-17 at 05:27:42ID: 23192966

row level locking is the default locking mechanism of the database.  It doesn't matter how you access it.

session1 -  update my_table set my_column = 'abcd' where my_id =  1;

session2 - update my_table set my_column = 'xyz' where my_id < 10;


session 1 will have a lock on id=1 ,  session 2 will have a lock on id's 2-9 and will have to wait on session 1.


if you're doing a select with locks, then the "for update" clause as described by sujith80 above is correct and "no wait" could be applied to the update as well

 

by: cakurienPosted on 2008-12-17 at 20:41:31ID: 23200694

Hi all,
I need to implemant  this lock through hibernate. any clues?

 

by: cakurienPosted on 2008-12-17 at 20:42:12ID: 23200696

Hi all,
I need to implemant  this lock through hibernate/JPA. any clues?

 

by: sompol_kiatkamolchaiPosted on 2008-12-17 at 21:41:00ID: 23200896

hi cakurien,

please see this reference.

http://www.hibernate.org/hib_docs/reference/en/html/transactions-locking.html

hope this help,
sompol.

20120131-EE-VQP-002

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