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Status Not under consideration
Workspace Db2
Created by Guest
Created on Nov 14, 2016

PL/SQL compatibility - default values of procedure parameters

Currently DB2 does not fully support Oracle-style definition of default parameters in PL/SQL stored procedures (including those in functions).

The following definition works in Oracle, but requires modification in DB2:

CREATE OR REPLACE PACKAGE myschema.pkg1 IS
FUNCTION GetParam(p_name VARCHAR2) RETURN VARCHAR2;
END
/

CREATE OR REPLACE PACKAGE myschema.pkg2 IS
PROCEDURE myProc(p_data VARCHAR2 := pkg1.GetParam('p1'));
END
/

DB2 requires two modifications in the code above:
(a) the schema name needs to be specified (while Oracle allows to reference packages in the same schema without schema prefix)
(b) the whole default number needs to be taken into braces "()", otherwise error SQL0104N is returned

The current DB2 version accepts the following:

CREATE OR REPLACE PACKAGE myschema.pkg2 IS
PROCEDURE myProc(p_data VARCHAR2 := (myschema.pkg1.GetParam('p1')));
END
/

In case when the number of such constructs is large, this makes porting harder (and requires otherwise unneeded changes).

It would be good if DB2 would automatically add the schema of the current package to the CURRENT PATH (to enable the proper search of functions).

It would be also good to get rid of the need to add braces around the complex expression in the default value.