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From "Fernanda Pizzorno (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-517) ResultSet - relative(int rows) behaves different in embedded and client/server mode when the positioning before the first row or after the last row.
Date Wed, 23 Nov 2005 12:29:36 GMT
     [ http://issues.apache.org/jira/browse/DERBY-517?page=all ]

Fernanda Pizzorno updated DERBY-517:
------------------------------------

    Attachment: testPositionLastPrev.java

There is also another problem that has been fixed by this patch. When positioning with rs.afterLast()
and moving backwards (using rs.previous()) the client driver would only access fetchSize rows
and not all rows in the result set. The attached repro case (testPositionLastPrev.java) shows
this behaviour. 

* Output of testPositionLastPrev.java before patch:

Show all rows.
Forward - Row: 1: Testing 1
Forward - Row: 2: Testing 2
Forward - Row: 3: Testing 3
Forward - Row: 4: Testing 4
Forward - Row: 5: Testing 5
Forward - Row: 6: Testing 6
Forward - Row: 7: Testing 7
Forward - Row: 8: Testing 8
Forward - Row: 9: Testing 9
Forward - Row: 10: Testing 10

Position after the last row and show all rows backwards.
Backward - Row: 5: Testing 5
Backward - Row: 4: Testing 4
Backward - Row: 3: Testing 3
Backward - Row: 2: Testing 2
Backward - Row: 1: Testing 1

* Output after patch:

Show all rows.
Forward - Row: 1: Testing 1
Forward - Row: 2: Testing 2
Forward - Row: 3: Testing 3
Forward - Row: 4: Testing 4
Forward - Row: 5: Testing 5
Forward - Row: 6: Testing 6
Forward - Row: 7: Testing 7
Forward - Row: 8: Testing 8
Forward - Row: 9: Testing 9
Forward - Row: 10: Testing 10

Position after the last row and show all rows backwards.
Backward - Row: 10: Testing 10
Backward - Row: 9: Testing 9
Backward - Row: 8: Testing 8
Backward - Row: 7: Testing 7
Backward - Row: 6: Testing 6
Backward - Row: 5: Testing 5
Backward - Row: 4: Testing 4
Backward - Row: 3: Testing 3
Backward - Row: 2: Testing 2
Backward - Row: 1: Testing 1


> ResultSet - relative(int rows) behaves different in embedded and client/server mode when
the positioning before the first row or after the last row.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-517
>          URL: http://issues.apache.org/jira/browse/DERBY-517
>      Project: Derby
>         Type: Bug
>   Components: Network Client
>     Reporter: Fernanda Pizzorno
>     Assignee: Fernanda Pizzorno
>      Fix For: 10.2.0.0
>  Attachments: DERBY-517-2.diff, DERBY-517-2.stat, testPositionLastPrev.java
>
> RecordSet - relative(int rows) behaves different in embedded and client/server mode when
the positioning before the first row or after the last row.
> The embedded driver shows the behaviour described in the JDBC 3.0 specification, returning
false and postitioning in either before first or after last. While the client/server driver
returns true and incrementing/decrementing the current row by "rows" and not setting the position
to either before first of after last.
> I have run a test with a result set with 10 rows, where I positioned in row 5 and moved
+20 and - 20 using relative(int rows). With the embedded driver the method returned false,
the current row was set to 0 and isAfterLast() and isBeforeFirst() returned true (for +20
and -20 respectively). With the client/server driver the method returned true, the current
row was set to 25 and -15 (for +20 and -20 respectively) and isAfterLast() and isBeforeFirst()
returned false.
> I have also run a test as the first one but running next() 5 times instead of absolute(5)
for postitioning in row 5, and then relative(20) produced the expected results with the client/server
driver.

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