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From "Tomohito Nakayama (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-167) Inserting values in an identity column
Date Wed, 06 Apr 2005 16:09:22 GMT
     [ http://issues.apache.org/jira/browse/DERBY-167?page=comments#action_62281 ]
     
Tomohito Nakayama commented on DERBY-167:
-----------------------------------------

Reading source codes relating to DERBY-167 and found next constructors.

ColumnDescriptor(java.lang.String columnName, int columnPosition, 
DataTypeDescriptor columnType, DataValueDescriptor columnDefault, 
DefaultInfo columnDefaultInfo, TableDescriptor table, UUID defaultUUID, long 
autoincStart, long autoincInc, boolean autoinc)
          Constructor for a ColumnDescriptor
ColumnDescriptor(java.lang.String columnName, int columnPosition, 
DataTypeDescriptor columnType, DataValueDescriptor columnDefault, 
DefaultInfo columnDefaultInfo, UUID uuid, UUID defaultUUID, long 
autoincStart, long autoincInc, boolean autoinc)
          Constructor for a ColumnDescriptor.


These constructors have many parameters.

AutoIncrementing intial value is related to  following parameters:
    long autoincStart,
    long autoincInc,
    boolean autoinc
Default intial value is related to following parameter:
    DefaultInfo columnDefaultInfo


I wonder how to handle these separated information of rules for initial 
values in DERBY-167 task ....
New class InitialValueRule may be appropriate to exist ....

> 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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