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From "Satheesh Bandaram (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-359) GENERATED BY DEFAULT identity option should consume identity values even if the transaction aborts. This would allow skipping over user inserted values during system generation.
Date Tue, 14 Jun 2005 19:06:48 GMT
GENERATED BY DEFAULT identity option should consume identity values even if the transaction
aborts. This would allow skipping over user inserted values during system generation.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

         Key: DERBY-359
         URL: http://issues.apache.org/jira/browse/DERBY-359
     Project: Derby
        Type: Improvement
  Components: SQL  
    Versions: 10.1.0.0    
 Environment: Generic
    Reporter: Satheesh Bandaram


Using GENERATED BY DEFAULT identity column, user can specify a value to be inserted into identity
column. When the system generated value and this user specified value match, if an unique
index is present, an error is correctly generated. However, it is desirable to skip this value
for next identity generation, so that next INSERT would pass. Currently, all subsequent insert
statements fail.

ij(CONNECTION0)> create table tauto(i int generated by default as identity, k int);
0 rows inserted/updated/deleted
ij(CONNECTION0)> create unique index tautoInd on tauto(i);
0 rows inserted/updated/deleted
ij(CONNECTION0)> insert into tauto(k) values 1,2;
2 rows inserted/updated/deleted
ij(CONNECTION0)> select * from tauto;
I          |K
-----------------------
1          |1
2          |2

2 rows selected
ij(CONNECTION0)> insert into tauto values (4,4);
1 row inserted/updated/deleted
ij(CONNECTION0)> insert into tauto(k) values 3;
1 row inserted/updated/deleted
ij(CONNECTION0)> insert into tauto(k) values 4;             <=== Expected error.
ERROR 23505: The statement was aborted because it would have caused a duplicate
key value in a unique or primary key constraint or unique index identified by 'T
AUTOIND' defined on 'TAUTO'.
ij(CONNECTION0)> insert into tauto(k) values 5;             <=== Would be preferable
to skip over identity value of '4' and use '5'
ERROR 23505: The statement was aborted because it would have caused a duplicate
key value in a unique or primary key constraint or unique index identified by 'T
AUTOIND' defined on 'TAUTO'.
ij(CONNECTION0)> insert into tauto(k) values 6;
ERROR 23505: The statement was aborted because it would have caused a duplicate
key value in a unique or primary key constraint or unique index identified by 'T
AUTOIND' defined on 'TAUTO'.
ij(CONNECTION0)>

At this point, all system generated identity value based inserts would continue to fail.



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