我正在尝试在包中创建一个返回表的函数。我希望在包中调用该函数一次,但能够多次重复使用其数据。虽然我知道我在 Oracle 中创建了临时表,但我希望保持干燥。
到目前为止,这就是我所拥有的:
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;
标头可以编译,而主体则不能。一条错误消息是“值不足”,这可能意味着我应该选择 MEASURE_RECORD,而不是 MEASURE_TABLE。
我缺少什么?
我想你想要一个流水线表函数.
像这样的东西:
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;
为了简单起见,我删除了你的参数,并且没有在函数中实现循环,但你可以看到原理。
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.
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