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https://issues.apache.org/jira/browse/DERBY-3609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603985#action_12603985
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Oleksandr Alesinskyy commented on DERBY-3609:
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Exactly,. and its requires support for multirow inserts, namely
"In some cases, such as in an insert select statement, more than one key may be
returned. The ResultSet object returned by getGeneratedKeys will contain a
row for each key that a statement generated. If no keys are generated, an empty
result set will be returned."
> Wrong functionality of auto-generated keys support
> --------------------------------------------------
>
> Key: DERBY-3609
> URL: https://issues.apache.org/jira/browse/DERBY-3609
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 10.3.2.1
> Environment: N/A
> Reporter: Oleksandr Alesinskyy
> Attachments: TestGeneratedKeys.java
>
>
> Currently support for autogeneration key retrieval in JDBC driver
> (java.sql.Statement) relies on IDENTITY_VAL_LOCAL function, which means that
> for multi-row INSERT... VALUES statements as well as for INSERT...AS SELECT
> statement wrong result are returned (key generated of last executed
> single-row INSERT...VALUES statement or NULL otherwise). While this
> functionality is documented in the Reference description of
> IDENTITY_VAL_LOCAL it is not so clearly documented in "autogenerated keys"
> subchapter of JDBC 3.0 Features (the only vague hint is "Calling
> ResultSet.getMetaData on the ResultSet object returned by getGeneratedKeys
> produces a ResultSetMetaData object that is similar to that returned by
> IDENTITY_VAL_LOCAL.").
> Moreover, as far as I understant it diverge from JDBC specification. IMHO or
> this functionality shal lbe implemented completely, or exception shall be
> thrown if for given statement functionality is not supported (e.g. "Feature
> not supported").
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