[
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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