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From "Dag H. Wanvik (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1904) COALESCE with NULL parameter problem
Date Tue, 03 Oct 2006 16:27:20 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1904?page=comments#action_12439559 ] 
            
Dag H. Wanvik commented on DERBY-1904:
--------------------------------------

Derby supports using setObject with a null value only if the
type is provided, that is, the form:

     void setObject(int parameterIndex, 
                    Object x, 
		    int targetSqlType) throws SQLException

e.g.
	ps.setObject(1, null, java.sql.Types.BIGINT);

The JDBC4 SQL API warns against using the form without the explicit type:
(quote):

     void setObject(int parameterIndex,
                    Object x) throws SQLException

     :

     Note: Not all databases allow for a non-typed Null to be sent to
     the backend. For maximum portability, the setNull or the
     setObject(int parameterIndex, Object x, int sqlType) method
     should be used instead of setObject(int parameterIndex, Object
     x).

I tried both forms with 10.2 and the former works for both embedded
and client drivers.

I am not familiar with JSTL, is there any way you can influence what
SQL is generated?


> COALESCE with NULL parameter problem
> ------------------------------------
>
>                 Key: DERBY-1904
>                 URL: http://issues.apache.org/jira/browse/DERBY-1904
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, SQL
>    Affects Versions: 10.1.3.1
>         Environment: Windows 2000 SP4
> JSTL 1.0.6 on J2EE 1.3
> Tomcat 5.0.28  using a SUN JVM 1.4.2_03
>            Reporter: Cédric Gérard
>            Priority: Blocker
>         Attachments: dblook.log, stackfromderby.log
>
>
> Hi,
> My  initial objective was to execute this query with  the JSTL sql tag library  :
>   
> SELECT  ID_ITM, ITM_NAME, ITM_CODE
>     FROM  ITEMS
>     WHERE  ITM_CODE = COALESCE(?,ITM_CODE)
>   
> ITM_CODE is a NUMERIC column, here's the DDL script of the ITEMS  table :
> CREATE  TABLE  ITEMS (  
>          ID_ITM                BIGINT NOT  NULL  GENERATED ALWAYS AS  IDENTITY, 
>          ITM_CODE         NUMERIC  (22) NOT  NULL
>  );
> When ITM_CODE is not set in my application, JSTL bind the parameter as null. When ITM_CODE
is set, it works.
>   
>  I  got this message error : 
>  : Invalid  data conversion: Parameter object type is invalid for requested conversion.
 (Apache
> Derby  release 10.1.3.1 client  driver)
> => We try to use CAST(? AS NUMERIC) in place of ?. We obtain the same error when NULL
is passed.
>  : The  exception 'java.lang.ArrayIndexOutOfBoundsException: -1' was thrown while  evaluating
> an expression. SQLSTATE: XJ001: Java exception: '-1:  java.lang.ArrayIndexOutOfBoundsException'.
> (Apache Derby snapshot-10.2.0.4  client driver)
> With ij, we have the same problem (but not the same message)
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE = COALESCE(NULL,ITM_CODE );
> ERROR 42X01: Syntax error: Encountered "NULL" at line 3, column 31.
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE = COALESCE(NULLIF(1,1),ITM_CODE );
> ID_ITM              |ITM_NAME                                          |ITM_CODE
> ------------------------------------------------------------------------------------------------
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while evaluating
an expression. SQLSTATE: XJ001: Java exception: ': java.lang.NullPointerException'.
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE = COALESCE(CAST(NULLIF(1,1) AS BIGINT), ITM_CODE);
> ID_ITM              |ITM_NAME                                          |ITM_CODE
> ------------------------------------------------------------------------------------------------
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while evaluating
an expression. SQLSTATE: XJ001: Java exception: ': java.lang.NullPointerException'.
> We have the same errors using 10.2.0.4 snapshot.
> The coalesce function should accept NULL parameter.
> Of course, My sample is very simple and I have n search criteria; so I don't want to
create 2^n SQL queries to deal with null or not null criterion.
> I try to replace the coalesce function with a CASE statement but I encountered the same
problems...
> So I don't actually have any workaround.
> Regards,
> Cédric

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