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Userdefined function with variable number of parameters

 
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bauer
Intermediate


Joined: 10 Oct 2003
Posts: 315
Topics: 49
Location: Germany
PostPosted: Thu Nov 05, 2020 12:31 pm    Post subject: Userdefined function with variable number of parameters Reply with quote
The requirement is something like this:

Code:


SELECT X FROM MYTABLE
WHERE MYTABLE.FIELD1 = UDF(1,2,3,...);


CREATE FUNCTON UDF
    ( P1, P2,P3 ....)
    RETURNS INTEGER
    -- DO SOMETHING
    RETURN ...




One field in a where clause should be prepared by a user defined function, pure native SQL, no REXX, C etc. function.

The number of parameters for the function is variable.

The DB2 zOS syntax says, this it not possible; my understanding.

Creating a type CREATE TYPE myType BIGINT ARRAY [] is possible, but not accepted for a user defined function as parameter.

How is it possible to pass a variable number of parameters to a userdefined function?

Or: Stored procedures seems to accept array parameters. But how to call the procedure inside a native SQL query? How to setup the array just inside a SQL query?

Any hints are welcome.
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kolusu
Site Admin
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Joined: 26 Nov 2002
Posts: 12375
Topics: 75
Location: San Jose
PostPosted: Thu Nov 05, 2020 12:52 pm    Post subject: Reply with quote
bauer,

Can't you define the max possible values to UDF and then pass the values with default values?

For example if the UDF accepts a max of 10 parms then

Code:

SELECT X FROM MYTABLE
WHERE MYTABLE.FIELD1 = UDF(1,2,3,,,,,,,,);

** comma separates each parm - so make sure to have "n" commas


And the UDF can be

Code:

CREATE FUNCTON UDF
    ( P1,P2,P3,P4,P5,P6,P7,P8,P9,P10)
    RETURNS INTEGER
    -- DO SOMETHING
    RETURN ...

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bauer
Intermediate


Joined: 10 Oct 2003
Posts: 315
Topics: 49
Location: Germany
PostPosted: Thu Nov 05, 2020 1:13 pm    Post subject: Reply with quote
Yes, max number of parameters works.
Not so nice, but might be a solution.
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