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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1288) Bring Derby into JDBC compliance by supporting executeQuery() on escaped procedure invocations
Date Thu, 04 May 2006 19:19:20 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1288?page=comments#action_12377874 ] 

Daniel John Debrunner commented on DERBY-1288:

dan >> If multiple result sets are returned when should any error be thrown, before
the execution starts or once the system detects that multiple result sets are returned?

lance > This would probably be implementation defined depending on the mechanism being

This is where I get confused, if this is implementation defined then how can returning a single
ResultSet not be implementation defined as well? Is there a good clear definition of the behaviour
you would like to see?

As an example, if the behaviour is implementation defined then it seems to me that a procedure
that was defined with DYNAMIC RESULT SETS 4 could be rejected at compile time, even though
it could at runtime only return a single result set. This seems a valid implementation

Similarly a procedure defined with DYNAMIC RESULT SETS 1 could return zero result sets, and
thus the executeQuery() has to thrown an exception.

As I've said in DERBY-501, section of JDBC 3.0 states:
"If the type or number of results returned by a CallableStatement object are not
known until run time, the CallableStatement object should be executed with the
method execute."
Now with Derby Java procedures, the engine does *not* know until runtime how many ResultSets
are returned, so it seems to me that this implies execute() must be used and so executeQuery
is invalid.
Maybe I'm reading this the wrong way, and "known" applies to the knowledge of the application
and not the driver/database engine?

> Bring Derby into JDBC compliance by supporting executeQuery() on escaped procedure invocations
> ----------------------------------------------------------------------------------------------
>          Key: DERBY-1288
>          URL: http://issues.apache.org/jira/browse/DERBY-1288
>      Project: Derby
>         Type: Improvement

>   Components: JDBC
>     Versions:
>     Reporter: Rick Hillegas
>      Fix For:

> The following statement raises an error in Derby:
>   statement.executeQuery( "{call foo()}" );
> although this statement works:
>   statement.executeUpdate( "{call foo()}" );
> According to section 6.4 of the latest draft of the JDBC4 Compliance chapter, both statements
are supposed to work in order to claim Java EE JDBC Compliance.
> We need to bring Derby into compliance by supporting executeQuery() on escaped procedure

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