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

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

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

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.
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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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