I'm trying to create a function in package that returns a table. I hope to call the function once in the package, but be able to re-use its data mulitple times. While I know I create temp tables in Oracle, I was hoping to keep things DRY.
So far, this is what I have:
Header:
CREATE OR REPLACE PACKAGE TEST AS
TYPE MEASURE_RECORD IS RECORD (
L4_ID VARCHAR2(50),
L6_ID VARCHAR2(50),
L8_ID VARCHAR2(50),
YEAR NUMBER,
PERIOD NUMBER,
VALUE NUMBER
);
TYPE MEASURE_TABLE IS TABLE OF MEASURE_RECORD;
FUNCTION GET_UPS(
TIMESPAN_IN IN VARCHAR2 DEFAULT 'MONTLHY',
STARTING_DATE_IN DATE,
ENDING_DATE_IN DATE
) RETURN MEASURE_TABLE;
END TEST;
Body:
CREATE OR REPLACE PACKAGE BODY TEST AS
FUNCTION GET_UPS (
TIMESPAN_IN IN VARCHAR2 DEFAULT 'MONTLHY',
STARTING_DATE_IN DATE,
ENDING_DATE_IN DATE
) RETURN MEASURE_TABLE IS
T MEASURE_TABLE;
BEGIN
SELECT ...
INTO T
FROM ...
;
RETURN T;
END GET_UPS;
END TEST;
The header compiles, the body does not. One error message is 'not enough values', which probably means that I should be selecting into the MEASURE_RECORD, rather than the MEASURE_TABLE.
What am I missing?
I think you want a pipelined table function.
Something like this:
CREATE OR REPLACE PACKAGE test AS
TYPE measure_record IS RECORD(
l4_id VARCHAR2(50),
l6_id VARCHAR2(50),
l8_id VARCHAR2(50),
year NUMBER,
period NUMBER,
VALUE NUMBER);
TYPE measure_table IS TABLE OF measure_record;
FUNCTION get_ups(foo NUMBER)
RETURN measure_table
PIPELINED;
END;
CREATE OR REPLACE PACKAGE BODY test AS
FUNCTION get_ups(foo number)
RETURN measure_table
PIPELINED IS
rec measure_record;
BEGIN
SELECT 'foo', 'bar', 'baz', 2010, 5, 13
INTO rec
FROM DUAL;
-- you would usually have a cursor and a loop here
PIPE ROW (rec);
RETURN;
END get_ups;
END;
For simplicity I removed your parameters and didn't implement a loop in the function, but you can see the principle.
Usage:
SELECT *
FROM table(test.get_ups(0));
L4_ID L6_ID L8_ID YEAR PERIOD VALUE
----- ----- ----- ---------- ---------- ----------
foo bar baz 2010 5 13
1 row selected.
CREATE OR REPLACE PACKAGE BODY TEST AS
FUNCTION GET_UPS(
TIMESPAN_IN IN VARCHAR2 DEFAULT 'MONTLHY',
STARTING_DATE_IN DATE,
ENDING_DATE_IN DATE
)RETURN MEASURE_TABLE IS
T MEASURE_TABLE;
BEGIN
**SELECT MEASURE_RECORD(L4_ID , L6_ID ,L8_ID ,YEAR ,
PERIOD,VALUE ) BULK COLLECT INTO T
FROM ...**
;
RETURN T;
END GET_UPS;
END TEST;
To return the whole table at once you could change the SELECT to:
SELECT ...
BULK COLLECT INTO T
FROM ...
This is only advisable for results that aren't excessively large, since they all have to be accumulated in memory before being returned; otherwise consider the pipelined function as suggested by Charles, or returning a REF CURSOR.
Source: Stackoverflow.com