I am trying to return a table via a function in an Oracle package:
CREATE OR REPLACE PACKAGE test AS
TYPE rec IS RECORD(
col1 VARCHAR(10));
TYPE rec_table IS TABLE OF rec;
FUNCTION get_table(input VARCHAR2)
RETURN rec_table
PIPELINED;
END;
CREATE OR REPLACE PACKAGE BODY test AS
FUNCTION get_table(input VARCHAR2)
RETURN rec_table
PIPELINED IS
rec1 rec;
BEGIN
SELECT * INTO rec1
FROM
(
SELECT '1' from dual
UNION ALL
SELECT '2' from dual
);
PIPE ROW (rec1)
RETURN;
END get_table;
END;
but when I try to run
select * from table(test.get_table('blah'))
I get an error: exact fetch returns more then requested number of rows
I've read a bit about BULK COLLECT INTO, but I am not understanding the syntax...
The following piece of code:
SELECT '1' from dual
UNION ALL
SELECT '2' from dual
Returns two, not one record, and you are trying to put those two records in one rec variable. You should instead loop through the results of the UNION:
FOR v_rec IN (
SELECT *
FROM (
SELECT '1' from dual
UNION ALL
SELECT '2' from dual
)
)
LOOP
PIPE ROW (v_rec);
END LOOP;
Related
I want to create a function that returns multiple rows into a table that is of object type.
I have created an object and a nested table object and now when I run the function there is an error which says
PL/SQL: SQL Statement ignored
PL/SQL: ORA-00947: not enough values
-- Object type creation
create or replace type test_object_sn as object
(
column_1 varchar2(30),
column_2 varchar2(30),
column_3 number
);
-- Table of object
create or replace type test_otable_sn as table of test_object_sn;
-- function (where I get an error)
create or replace function load_test_object_sn
return test_otable_sn
as
details test_otable_sn;
begin
with ad as (select 'a', 'b', 4 from dual
union all
select 'r', '5', 3 from dual
union all
select 'g', 's', 3 from dual)
select * into details from ad;
return details;
end;
I want to have the test_otable_sn table object loaded with the data and then query it using the table() function via my load_test_object_sn function
e.g. select * from table(load_test_object_sn);
Update:
do you know how to modify this for scenario whereby I have an sql
statement contained in a string variable to execute?
Yes, we can use a cursor reference (SYS_REFCURSOR) and OPEN/FETCH/CLOSE instead of a CURSOR and CURSOR FOR LOOP.
The syntax is OPEN <cursor-reference> FOR <string-containing-sql-statement> . See below.
CREATE OR REPLACE FUNCTION load_test_object_sn
RETURN test_otable_sn
AS
details test_otable_sn := test_otable_sn();
-- Variable stores SQL statement for cursor
l_sql CLOB :=
q'[with ad as (
select 'a' column_1, 'b' column_2, 4 column_3 from dual union all
select 'r', '5', 3 from dual union all
select 'g', 's', 3 from dual
)
select *
from ad]';
-- Cursor reference allows us to open cursor for SQL statement above
rc SYS_REFCURSOR;
-- Define object instance to store each row fetched from the cursor
l_obj test_object_sn := test_object_sn(NULL, NULL, NULL);
i PLS_INTEGER := 1;
BEGIN
-- Explicitly open, fetch from, and close the cursor
OPEN rc FOR l_sql;
LOOP
FETCH rc INTO l_obj.column_1, l_obj.column_2, l_obj.column_3;
EXIT WHEN rc%NOTFOUND;
details.extend();
details(i) := test_object_sn(l_obj.column_1, l_obj.column_2, l_obj.column_3);
i := i + 1;
END LOOP;
CLOSE rc;
RETURN details;
END;
Original answer:
Unfortunately, one can't use SELECT * INTO with a collection in this manner, so here's an alternative way to populate the table:
create or replace function load_test_object_sn
return test_otable_sn
as
details test_otable_sn := test_otable_sn();
cursor c_ad is
with ad as (select 'a' column_1, 'b' column_2, 4 column_3 from dual
union all
select 'r', '5', 3 from dual
union all
select 'g', 's', 3 from dual)
select * from ad;
i pls_integer := 1;
begin
for ad_rec in c_ad loop
details.extend();
details(i) := test_object_sn(ad_rec.column_1, ad_rec.column_2, ad_rec.column_3);
i := i + 1;
end loop;
return details;
end;
/
Output:
SQL> SELECT * FROM TABLE(load_test_object_sn);
COLUMN_1 COLUMN_2 COLUMN_3
---------- ---------- ----------
a b 4
r 5 3
g s 3
I want to use my result of function e.g. 'S500,S600,S700,S800' in a subquery in another script like:
where dept_no in (my result of function)
So I want to convert my string result to be like this ('S500','S600','S700','S800').
I tried to do this with dynamic SQL but I can't get it to work.
Hope below snipet suffice your requirement.
Approach 1 -> More effective
--Create a table type of VARCHAR
CREATE OR REPLACE type string_table
IS
TABLE OF VARCHAR2(100);
--Function to return tabl type
CREATE OR REPLACE
FUNCTION string_manipulate
RETURN string_table
AS
str_tab string_table;
BEGIN
SELECT 's00'||level bulk collect INTO str_tab FROM dual CONNECT BY level < 10;
RETURN str_tab;
end;
--Use function in the query
SELECT distinct 1
FROM
(SELECT 's001' dn FROM dual
UNION ALL
SELECT 's002' dn FROM dual
UNION ALL
SELECT 's003' dn FROM dual
UNION ALL
SELECT 's004' dn FROM dual
UNION ALL
SELECT 's005' dn FROM dual
UNION ALL
SELECT 's006' dn FROM dual
UNION ALL
SELECT 's007' dn FROM dual
UNION ALL
SELECT 's008' dn FROM dual
UNION ALL
SELECT 's009' dn FROM dual
)a
WHERE a.dn IN
(SELECT * FROM TABLE(string_manipulate)
);
--Approach 2
--Function to get output as mentioned.
CREATE OR REPLACE
FUNCTION string_manipulate
RETURN VARCHAR2
AS
BEGIN
RETURN 'S2009,S2020,S2021';
END;
-- Use function value in a query
SELECT 1
FROM dual
WHERE '''S2009'',''S2020'',''S2021''' = (''''
||REPLACE(string_manipulate,',',''',''')
||'''');
You need an iterator and text splitting by comma sign:
select empno,ename,sal,deptno
from emp
where empno in (
select to_number(
rtrim(
substr(emps,
instr(emps,',',1,iter.pos)+1,
instr(emps,',',1,iter.pos+1) -
instr(emps,',',1,iter.pos)),',')) emps
from (select ','||'7654,7698,7782,7788'||',' emps from t1) csv,
(select rownum pos from emp) iter
where iter.pos <= ((length(csv.emps) -
length(replace(csv.emps,',')))/length(','))-1
)
But better rewrite your function to return cursor.
you can use collection:
SELECT *
FROM YOUR_TABLE
WHERE DEPT_NO IN (SELECT *
FROM TABLE (SPLIT ('S500,S600,S700,S800')))--splits text with comma, for other chars use split(text, split_char)
With usage of MEMBER OF
SELECT *
FROM YOUR_TABLE
WHERE DEPT_NO MEMBER OF SPLIT ('S500,S600,S700,S800')--splits text with comma, for other chars use split(text, split_char)
the split fuction is:
CREATE OR REPLACE TYPE SPLIT_TBL AS TABLE OF VARCHAR2 (32767);
CREATE OR REPLACE FUNCTION SPLIT (P_LIST VARCHAR2, P_DEL VARCHAR2 := ',')
RETURN SPLIT_TBL
PIPELINED
IS
L_IDX PLS_INTEGER;
L_LIST VARCHAR2 (32767) := P_LIST;
BEGIN
LOOP
L_IDX := INSTR (L_LIST, P_DEL);
IF L_IDX > 0
THEN
PIPE ROW (SUBSTR (L_LIST, 1, L_IDX - 1));
L_LIST := SUBSTR (L_LIST, L_IDX + LENGTH (P_DEL));
ELSE
PIPE ROW (L_LIST);
EXIT;
END IF;
END LOOP;
RETURN;
END SPLIT;
FUNCTION GET_TS_EACH_DAY_DEPARTMENT (P_SER_NO VARCHAR2,
P_TS_DATE DATE
)
RETURN STRING_TABLE
IS
V_DEPT_NO VARCHAR2 (4000);
V_DEPT VARCHAR2(4000);
V_TABLE STRING_TABLE:=STRING_TABLE();
J NUMBER:=1;
BEGIN
for i in (select distinct ts_day dayy from WEB_TS_USER_LOCATIONS_V ) loop
V_TABLE.EXTEND;
V_TABLE(J):= WEB_TS_PKG.GET_TS_DAY_DEPARTMENT (P_SER_NO ,P_TS_DATE , i.dayy );
J:=J+1;
end loop;
RETURN V_TABLE;
END GET_TS_EACH_DAY_DEPARTMENT;
I get Error:
PLS-00231: function 'GET_NUM' may not be used in SQL
when the following code is executed;
CREATE OR REPLACE PACKAGE BODY TESTJNSABC IS
-- FUNCTION IMPLEMENTATIONS
FUNCTION get_num(num IN NUMBER)
RETURN SYS_REFCURSOR AS
my_cursor SYS_REFCURSOR;
BEGIN
--
OPEN my_cursor FOR
WITH ntable AS (
SELECT 1 ID, 111 AGT, 'ABC' DESCRIP FROM DUAL
UNION ALL
SELECT 2 ID, 222 AGT, 'ABC' DESCRIP FROM DUAL
UNION ALL
SELECT 1 ID, 333 AGT, 'ABC' DESCRIP FROM DUAL
)
SELECT AGT FROM ntable WHERE ID = num;
RETURN my_cursor;
END;
-- PROCEDURE IMPLEMENTATIONS
PROCEDURE testingabc AS
BEGIN
WITH xtable AS (
SELECT 111 AGT, 'A' DESCRIP FROM DUAL
UNION ALL
SELECT 222 AGT, 'B' DESCRIP FROM DUAL
UNION ALL
SELECT 333 AGT, 'C' DESCRIP FROM DUAL
)
SELECT DESCRIP FROM xtable WHERE COD_AGT IN get_num(1);
END testingabc;
END TESTJNSABC;
Even if I call the function as TESTJNSABC.get_num(1) I still get the same error.
--UPDATE. So in real life scenario I would like to call a Function from a WHERE CLAUSE; the function should return a set of NUMBER values (that's why I use the IN clause).
So is it possible then to create a variable on the Procedure and
assign the Function values to the variable? Let's say
It sould not be the question whether it is possible or not rather it should had been if this is the right way. Ofcourse you can do it in the way you are doing but as experts suggested, that's not the right and efficient way. See how you can do it. PS: Not tested.
CREATE OR REPLACE PACKAGE BODY TESTJNSABC IS
-- FUNCTION IMPLEMENTATIONS
FUNCTION get_num(num IN NUMBER)
RETURN SYS_REFCURSOR AS
my_cursor SYS_REFCURSOR;
BEGIN
--
OPEN my_cursor FOR
WITH ntable AS (
SELECT 1 ID, 111 AGT, 'ABC' DESCRIP FROM DUAL
UNION ALL
SELECT 2 ID, 222 AGT, 'ABC' DESCRIP FROM DUAL
UNION ALL
SELECT 1 ID, 333 AGT, 'ABC' DESCRIP FROM DUAL
)
SELECT AGT FROM ntable WHERE ID = num;
RETURN my_cursor;
END;
-- PROCEDURE IMPLEMENTATIONS
PROCEDURE testingabc AS
--Creating a collection to hold return of the function
type y is table of varchar2(1000) index by pls_integer;
var_z y;
var_1 varchar2(100);
BEGIN
Select get_num(1)
bulk collect into var_z
from dual;
For i in 1..var_z.count
loop
WITH xtable AS (
SELECT 111 AGT, 'A' DESCRIP FROM DUAL
UNION ALL
SELECT 222 AGT, 'B' DESCRIP FROM DUAL
UNION ALL
SELECT 333 AGT, 'C' DESCRIP FROM DUAL
)
SELECT DESCRIP
into var_1
FROM xtable
WHERE AGT = var_z(i) ; ---Check each record
dbms_output.put_line(var_1);
end loop;
END testingabc;
END TESTJNSABC;
in () requires either a subquery or a comma-separated list of values, so no, you can't substitute a function that returns a collection.
Assuming the function is in scope for SQL queries (it's either a standalone function or declared in a package specification), you could use it in a table() construction (this needs a table function, i.e. it needs to return a collection, not a cursor):
where somecol in (select column_value from table(get_num(1)) )
(or the equivalent inner join etc.)
Demo at livesql.oracle.com/apex/livesql/file/content_EF2M0F1LV9LTP6PEII3BDFKAI.html
Edit: I've just noticed the example in the question tried to use a ref cursor. Note that the table() operator works on collections, not ref cursors. Therefore the function has to return a collection type (nested table or varray).
As per #William Robertson answer, I tried to implement the solution but getting issue :
[Error] ORA-22905 (18: 26): PL/SQL: ORA-22905: cannot access rows from
a non-nested table item
-- FUNCTION IMPLEMENTATIONS
create or replace FUNCTION get_num(num IN NUMBER)
RETURN SYS_REFCURSOR AS
my_cursor SYS_REFCURSOR;
BEGIN
--
OPEN my_cursor FOR
SELECT AGT
FROM ntable
WHERE ID = num;
RETURN my_cursor;
END;
-- PROCEDURE IMPLEMENTATIONS
CREATE OR REPLACE PROCEDURE testingabc
AS
type var is table of xtable.DESCRIP%type;
v_var var;
BEGIN
SELECT DESCRIP
bulk collect into var
FROM xtable
WHERE AGT IN (SELECT COLUMN_VALUE
FROM TABLE (get_num (1)));
END testingabc;
I want to use this array in 'select from..where..in(YYY)' statement.
I don't want to iterate through array values, I want to use it whole in my select statement.
Unfortunately, I found only how to iterate it:
1 declare
2 type array is table of varchar2(30) index by binary_integer;
3 a array;
4 procedure p( array_in array )
5 is
6 begin
7 for i in 1..array_in.count loop
8 dbms_output.put_line( array_in(i) );
9 end loop;
10 end;
11 begin
12 a(1) := 'Apple';
13 a(2) := 'Banana';
14 a(3) := 'Pear';
15 p( a );
16 end;
17 /
You can do this by creating a function returning your array. Then you can use it into a select:
Create external types and function
create or replace type t_array is table of varchar2(30);
create or replace function list_of_fruits
return t_array
is
l_ t_array:=t_array();
begin
l_.extend(); l_(l_.COUNT) := 'Apple';
l_.extend(); l_(l_.COUNT) := 'Banana';
l_.extend(); l_(l_.COUNT) := 'Pear';
return l_;
end list_of_fruits;
/
And here is how to use it:
select * from (
select 'Peter' this_and_that from dual
union all select 'Joy' from dual
union all select 'God' from dual
union all select 'Pear' from dual
union all select 'Man' from dual
)
where this_and_that in (
select column_value from (table( list_of_fruits() ))
);
The trick here is to use the table() function to make a SQL usable list for your select; also difficult for me was to discover the name of that column_value... which is some built-in constant from Oracle: how do you guess that?
You can use oracle defined collection to achieve this as well. Please see below and example.
declare
a sys.odcivarchar2list;
begin
a := sys.odcivarchar2list('Apple','Banana','Pear');
for r in ( SELECT m.column_value m_value
FROM table(a) m )
loop
dbms_output.put_line (r.m_value);
end loop;
end;
I'm trying to return a multiple values in a %rowtype from a function using two table(employees and departments), but it not working for me.
create or replace function get_employee
(loc in number)
return mv_emp%rowtype
as
emp_record mv_emp%rowtype;
begin
select a.first_name, a.last_name, b.department_name into emp_record
from employees a, departments b
where a.department_id=b.department_id and location_id=loc;
return(emp_record);
end;
The above function compiled without any error? What is the type of MV_EMP? Ideally, it should be something like below.
create or replace type emp_type
(
first_name varchar2(20)
, last_name varchar2(20)
, depart_name varchar2(20)
)
/
create or replace function get_employee
(loc in number)
return emp_type
as
emp_record emp_type;
begin
select a.first_name, a.last_name, b.department_name into emp_record
from employees a, departments b
where a.department_id=b.department_id and location_id=loc;
return(emp_record);
end;
create type t_row as object (a varchar2(10));
create type t_row_tab as table of t_row;
We will now create a function which will split the input string.
create or replace function get_number(pv_no_list in varchar2) return t_row_tab is
lv_no_list t_row_tab := t_row_tab();
begin
for i in (SELECT distinct REGEXP_SUBSTR(pv_no_list, '[^,]+', 1, LEVEL) no_list FROM dual
CONNECT BY REGEXP_SUBSTR(pv_no_list, '[^,]+', 1, LEVEL) IS NOT NULL)
loop
lv_no_list.extend;
lv_no_list(lv_no_list.last) := t_row(i.no_list);
end loop;
return lv_no_list;
end get_number;
Once the function is in place we can use the table clause of sql statement to get the desired result. As desired we got multiple values returned from the function.
SQL> select * from table(get_number('1,2,3,4'));
A
----------
1
3
2
4
So now our function is simply behaving like a table. There can be a situation where you want these comma separated values to be a part of "IN" clause.
For example :
select * from dummy_table where dummy_column in ('1,2,3,4');
But the above query will not work as '1,2,3,4' is a string and not individual numbers. To solve this problem you can simply use following query.
select * from dummy_table where dummy_column in ( select * from table(get_number('1,2,3,4')) );
References : http://www.oraclebin.com/2012/12/returning-multiple-values-from-function.html
CREATE OR replace FUNCTION Funmultiple(deptno_in IN NUMBER)
RETURN NUMBER AS v_refcursur SYS_REFCURSOR;
BEGIN
OPEN v_refcursor FOR
SELECT *
FROM emp
WHERE deptno = deptno_in;
retun v_refcursor;
END;
To call it, use:
variable x number
exec :x := FunMultiple(10);
print x