db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Alan Burlison (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3119) Derby does not resolve functions to methods with Integer return type.
Date Wed, 10 Oct 2007 08:26:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533651
] 

Alan Burlison commented on DERBY-3119:
--------------------------------------

Note that one important consequence of this bug is that functions that return primitive types
(int, float, double etc) have no way of returning a database NULL.

> Derby does not resolve functions to methods with Integer return type.
> ---------------------------------------------------------------------
>
>                 Key: DERBY-3119
>                 URL: https://issues.apache.org/jira/browse/DERBY-3119
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0, 10.3.1.4
>            Reporter: Rick Hillegas
>
> Derby can bind a function invocation to a method which returns int but not to a method
which returns Integer. I think that both of these resolutions should succeed given the rules
in the SQL Standard, part 13, section 8.6, syntax rule 5, case a, item ii. Here is some code
which shows this problem. First a class to declare the methods:
> public class zz
> {
>     public  static  int returnsInt()
>     {
>         return 1;
>     }
>     
>     public  static  Integer returnsInteger()
>     {
>         return new Integer( 2 );
>     }
>     
> }
> The following ij script shows that the int-returning method is resolved but not the Integer-returning
method:
> ij version 10.4
> ij> connect 'jdbc:derby:derby10.4;create=true';
> WARNING 01J01: Database 'derby10.4' not created, connection made to existing database
instead.
> ij> drop function returnsInt;
> 0 rows inserted/updated/deleted
> ij> drop function returnsInteger;
> 0 rows inserted/updated/deleted
> ij> create function returnsInt()
> returns int
> language java
> parameter style java
> no sql
> external name 'zz.returnsInt'
> ;
> 0 rows inserted/updated/deleted
> ij> create function returnsInteger()
> returns int
> language java
> parameter style java
> no sql
> external name 'zz.returnsInteger'
> ;
> 0 rows inserted/updated/deleted
> ij> values ( returnsInt() );
> 1          
> -----------
> 1          
> 1 row selected
> ij> values ( returnsInteger() );
> ERROR 42X50: No method was found that matched the method call int zz.returnsInteger(),
tried all combinations of object and primitive types and any possible type conversion for
any  parameters the method call may have. The method might exist but it is not public and/or
static, or the parameter types are not method invocation convertible.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message