[ http://issues.apache.org/jira/browse/DERBY-183?page=comments#action_12442313 ] Bryan Pendleton commented on DERBY-183: ---------------------------------------
I believe that RoutineAliasInfo.getParameterNames()[n] will return the empty string. It's a bit hard to figure this out directly, because I couldn't figure out how that method would get called from, say, an SQL statement. However, I looked at this indirectly by running dblook against a database which had some functions with unnamed parameters, and the output of dblook was as follows: CREATE FUNCTION "APP"."NONAME1" ( INTEGER, INTEGER) RETURNS INTEGER LANGUAGE JAVA PARAMETER STYLE JAVA READS SQL DATA CALLED ON NULL INPUT EXTERNAL NAME 'java.lang.Math.max' ; CREATE FUNCTION "APP"."NONAME2" (P1 INTEGER, INTEGER) RETURNS INTEGER LANGUAGE JAVA PARAMETER STYLE JAVA READS SQL DATA CALLED ON NULL INPUT EXTERNAL NAME 'java.lang.Math.max' ; By examining how RoutineAliasInfo.toString works, it seems that if the parameterNames array held NULL for the unnamed parameters, then dblook would have generated: CREATE FUNCTION "APP"."NONAME1" (NULL INTEGER,NULL INTEGER) RETURNS INTEGER LANGUAGE JAVA PARAMETER STYLE JAVA READS SQL DATA CALLED ON NULL INPUT EXTERNAL NAME 'java.lang.Math.max' ; CREATE FUNCTION "APP"."NONAME2" (P1 INTEGER,NULL INTEGER) RETURNS INTEGER LANGUAGE JAVA PARAMETER STYLE JAVA READS SQL DATA CALLED ON NULL INPUT EXTERNAL NAME 'java.lang.Math.max' ; So therefore I think that the parameterNames array contains empty strings, not null values, for unnamed parameters. I'll add a comment to this effect in the RoutineAliasInfo class. > Parameter names required in CREATE FUNCTION > ------------------------------------------- > > Key: DERBY-183 > URL: http://issues.apache.org/jira/browse/DERBY-183 > Project: Derby > Issue Type: Bug > Components: SQL > Affects Versions: 10.0.2.0 > Reporter: Jack Klebanoff > Assigned To: James F. Adams > Priority: Minor > Attachments: Derby183.patch.txt, Derby183.patch2.txt, > Derby183.patch3.txt > > > A statement like > create function s2.f2( char(8), integer) returns int > language java parameter style java external name 'myclass.mymethod' > fails with the message > ERROR 42X01: Syntax error: Encountered "char" at line 1, column 24 > However > create function s2.f2( p1 char(8), p2 integer) returns int > language java parameter style java external name 'myclass.mymethod' > is accepted. > The Derby documentation (at > http://incubator.apache.org/derby/manuals/reference/sqlj27.html#CREATE+PROCEDURE+Statement), > the SQL2003 standard, and DB2 all agree that the parameter name is optional. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
