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EclipseLink/Development/DBWS/ParseDDLforMetadata/UseCases
The existing o.e.p.platform.database.oracle.publisher
classes cannot handle the following use cases:
- default values for StoredProcedure/StoredFunction arguments (information not available in Data Dictionary prior to 11g)
- strongly-typed REF CURSOR as OUT argument when underlying RECORD type is also used as an argument or package-level global variable
CREATE OR REPLACE PACKAGE CURSOR_TEST AS TYPE EREC IS RECORD ( FLAG PLS_INTEGER, EMPNO NUMBER(4), ENAME VARCHAR2(10), JOB VARCHAR2(9) ); TYPE EREC_CURSOR IS REF CURSOR RETURN EREC; FUNCTION EFUNC(PARM1 IN VARCHAR2, PARM2 IN EREC) RETURN EREC_CURSOR; END CURSOR_TEST;
- object-graph distortion between optional arguments and overloading
Unfortunately, the information in the Data Dictionary views can be (under certain circumstances) incomplete or inaccurate, or the object-graph can be distorted. For example, an argument to a StoredProcedure may have a default value assigned to it, thus making it optional. This in turn means that the calling sequence can change (fewer arguments need be passed in):
CREATE OR REPLACE PACKAGE SOMEPKG AS TYPE EMP_REC IS RECORD( EMPNO EMP.EMPNO%TYPE, FNAME EMP.FNAME%TYPE, LNAME EMP.LNAME%TYPE ); PROCEDURE DOSOMETHING(MYREC IN OUT EMP_REC, STUFF IN VARCHAR2, P_EMPNO IN NUMBER := 20, FLAG IN BOOLEAN DEFAULT FALSE, WHATEVER IN VARCHAR2 DEFAULT 'bogus'); END;
The object-graph contains four StoredProcedure 'pseudo' representations:
DOSOMETHING(MYREC,STUFF) DOSOMETHING(MYREC,STUFF, P_EMPNO) DOSOMETHING(MYREC,STUFF, P_EMPNO, FLAG) DOSOMETHING(MYREC,STUFF, P_EMPNO, FLAG, WHATEVER)
however, there are an additional four 'pseudo' representations not generated:
DOSOMETHING(MYREC,STUFF, FLAG) DOSOMETHING(MYREC,STUFF, WHATEVER) DOSOMETHING(MYREC,STUFF, FLAG, WHATEVER) DOSOMETHING(MYREC,STUFF, P_EMPNO, WHATEVER)
This highlights an issue where the number of in-memory objects could expand geometrically at the rate of 2N. In addition, if the StoredProcedure DOSOMETHING was overloaded, the 'pseudo' representations could conflict.
- object-graph disconnect between PL/SQL composite arguments and JDBC composite arguments (bug 329435)
CREATE OR REPLACE PACKAGE TEST_PKG AS TYPE TESTREC IS TEST_EMP%ROWTYPE; ... END; CREATE OR REPLACE TYPE PHONE_OBJECT AS OBJECT ( AREACODE VARCHAR2(3), PHONENUMBER VARCHAR2(20), PHONETYPE VARCHAR2(20) ); CREATE OR REPLACE TYPE PHONE_LIST AS VARRAY(2) OF PHONE_OBJECT; CREATE TABLE TEST_EMP ( EMPNO NUMBER(4) NOT NULL, FNAME VARCHAR2(40), LNAME VARCHAR2(40), PHONES PHONE_LIST, PRIMARY KEY (EMPNO) );
Internally type TESTREC points to table TEST_EMP, but when the field PHONES is referenced, the traversal algorithm breaks down.