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From "Kathey Marsden (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-167) Inserting values in an identity column
Date Sun, 03 Apr 2005 03:27:17 GMT
     [ http://issues.apache.org/jira/browse/DERBY-167?page=comments#action_62039 ]
     
Kathey Marsden commented on DERBY-167:
--------------------------------------

Option 1 could be implemented per the sql standard by changing  the generated column-spec
for CREATE TABLE from:

generated-column-spec:  

[ [ WITH ] DEFAULT {ConstantExpression | NULL }
|
[ GENERATED ALWAYS AS IDENTITY 
[ ( START WITH IntegerConstant 
[ ,INCREMENT BY IntegerConstant] ) ]  ]  ]

to 

[ [ WITH ] DEFAULT {ConstantExpression | NULL }
|
[ GENERATED [ALWAYS | BY DEFAULT ] AS IDENTITY 
[ ( START WITH IntegerConstant 
[ ,INCREMENT BY IntegerConstant] ) ]  ]  ]





> Inserting values in an identity column
> --------------------------------------
>
>          Key: DERBY-167
>          URL: http://issues.apache.org/jira/browse/DERBY-167
>      Project: Derby
>         Type: Improvement
>   Components: SQL
>     Versions: 10.1.0.0
>  Environment: SQL
>     Reporter: Christian Rodriguez

>
> It is not possible to insert a specific value in a column defined as identity. This makes
it very hard to migrate from other RDBMSs or to import data dumped from other databases. 
> For example, an autoincrement column in MySQL should be an identity column. The problem
is that when the data is dumped from MySQL to a file, it generates inserts with values. These
values cant be inserted in the Derby table. 
> Posible solutions: 1. being able to "generate by default as identity" 2. being able to
disable the "identity" feature for a column 3. being able to generate a column as non identity
and after data is populated, alter table to add the "identity" to the column.

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