Re: no sql-select after sql-update? -- JAVA400-L

Please read mail 'URGENT please : Locked records'  also.

The record is available when using 'select...' statement when I execute the
methods from within VAJAVA, not when executed from webapp...
The intention is to 'lock' for updating only!

thanks




                    "Fred Kulack"
                    <kulack@us.ibm.com        To:     java400-l@midrange.com
                    >                         cc:
                    Sent by:                  Subject:     Re: no sql-select 
after sql-update?
                    java400-l-admin@mi
                    drange.com


                    12/10/2001 15:39
                    Please respond to
                    java400-l







Sure.
Repeatable read also means that you're going to be able to read the record
again and get the same values for the rows.
If its locked for update, you can't be allowed to read it or the data you
read may change (depending on whether the transaction that updated
changes the record again, or just does rollback or commit.


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Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, JTA, etc...
IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
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P.Goovaerts@Clipper.Be@midrange.com on 10/12/2001 02:13:05 AM

Please respond to java400-l@midrange.com

Sent by:  java400-l-admin@midrange.com


To:   java400-l@midrange.com
cc:
Subject:  no sql-select after sql-update?



user1 does the following:
1) setTransactionIsolation(4) (repeatable read)
2) setAutoCommit(false)
3) execute 'select' statement to retrieve list
4) execute 'select' statement to retrieve 1 record
5) execute 'update' statement to lock record (dummy update)

user2 does the following:
1) setTransactionIsolation(4) (repeatable read)
2) setAutoCommit(false)
3) execute 'select' statement to retrieve same list
this statement give an exception (lock)

Both user have their own connection/transaction.  I want user 1 to lock the
record for update but user2 should be able to read them...
I understood that TransactionIsolation(4) locks a record when update/delete
without commit()/rollback().  Now it seems that records are lock for
reading also?

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