I’m wondering if it’s technically possible to use procedure parameters in IF statement or how to solve this problem in different manner.
Situation description:
I have a procedure within other procedure where arguments of inner procedure are parameters of outer procedure. I would
like to use parameters of inner procedure within it’s body in IF statement eg: IF parameter1 OR parameter2 OR parameter3 IS NOT NULL THEN. . It’s worth to be mentioned that all parameters of outer procedure have to be DEFAULT NULL. Any ideas? Cheers.
are you trying to do like this :
--first procedure
CREATE OR REPLACE PROCEDURE p1(f_name varchar2 ,sal NUMBER )
IS
BEGIN
p2(f_name,sal);
END;
--second procedure
CREATE OR replace PROCEDURE p2(f_name varchar2 ,sal NUMBER )
IS
BEGIN
IF f_name IS NOT NULL OR sal IS NOT NULL
THEN
dbms_output.put_line(f_name ||' '||sal);
END IF;
END;
then call the first procedure :
BEGIN
p1( 'john',null );
END;
Related
In some places I heard that we cannot call procedure inside function in oracle PL/SQL. May I know why is it so?
Also why cant we call a procedure within a SELECT statement whereas we can call a function in the same SELECT statement.
Yes you can call a procedure from a function in Oracle PL/SQL.
You can't call a procedure from a SELECT statement because it doesn't return a value. A function can be called from a SELECT because it does:
select empno, calc_salary_function(empno) salary
from emp;
Calling a procedure from a SELECT makes no sense really:
select empno, fire_employee(empno) -- Will fail
from emp;
What would you expect to see in the second column of the results?
Procedure is not used to return a value. Procedures performs group of operations to achieve a task, where as function is used to return a value.
Procedure is executed as an operation, function can be used in the select statement derive a value
you can call procedure from function.
create table test(a varchar2(30));
create or replace procedure pro_insert_values
as
begin
insert into test values('anything');
end;
create or replace function fn_get_data
return number
as
begin
pro_insert_values;
return 1;
end;
sql>variable x number
exec :x:=fn_get_data
You can use below code to validate that procedure can be called from inside function.
create table country_name(id number, country varchar2(100));
insert all
into country_name values(1, 'INDIA')
into country_name values(2, 'UK')
SELECT * FROM DUAL;
/
CREATE OR REPLACE FUNCTION COUNTRY_FOUND_NOTFOUND(V_NAME VARCHAR2)
RETURN VARCHAR2
AS
V_COUNTRY VARCHAR2(100);
BEGIN
BEGIN
SELECT COUNTRY INTO V_COUNTRY FROM country_name WHERE COUNTRY = V_NAME;
RETURN 'FOUND';
EXCEPTION
WHEN NO_DATA_FOUND THEN
INSERT_COUNTRY(V_NAME);
RETURN 'NOT FOUND';
END;
RETURN 'NOT FOUND';
END;
/
CREATE OR REPLACE PROCEDURE INSERT_COUNTRY(V_NAME IN VARCHAR2)
AS
V_ID NUMBER;
BEGIN
SELECT MAX(ID) INTO V_ID FROM COUNTRY_NAME;
INSERT INTO COUNTRY_NAME VALUES(V_ID+1, V_NAME);
END;
/
SET SERVEROUTPUT ON;
DECLARE
V_NAME VARCHAR2(100);
BEGIN
V_NAME := COUNTRY_FOUND_NOTFOUND('SPAIN');
DBMS_OUTPUT.PUT_LINE(V_NAME);
END;
I have a procedure which accepts the table name and the 3 fields that need filling. This is to be called from another procedure that loops through another table deciding which sub-table to put stuff into. The important bit is a simple insert statement, e.g.
insert into table1 values
('blah','String','50');
So that 4 parameters coming in (table1, and the 3 values). How would I do this using dollar quoting? Obviously this doesnt work but gives you an idea of what I'm trying to accomplish:
create or replace procedure
insert_dc_table(p_tblname varchar,
p_name varchar,
p_datatype varchar,
p_datalen varchar)
as $$
begin
execute
'insert into '||p_tblname||'(name,datatype,datalen) values '
||'('
||p_name||', '
||p_datatype||', '
||p_datalen
||')';
end;
$$ language plpgsql;
I'd need double-dollars around some, but am unsure of exactly where $$ and quotes go in all this !*&#!
I could declare a variable to hold the execute statement and do:
declare a _output varchar(200);
a_output := $$ insert into $$||p_tblname||$$(name,datatype,datalen) values ( '$$||p_name||$$',
well, i get lost there!
Thanks in advance for help!
Redshift Stored Procedures only require dollar quoting of the procedure body. Quotes inside the the procedure body are interpreted as normal.
You may find that your SQL client does not submit the SP create correctly due to the dollar quotes. If so I recommend using psql to create the stored procedure.
Sample stored procedures are available in our "Amazon Redshift Utils" GitHub repository.
Here's a modification of your example:
-- DROP PROCEDURE insert_dc_table(VARCHAR,VARCHAR ,VARCHAR ,VARCHAR);
CREATE OR REPLACE PROCEDURE insert_dc_table(
p_tblname VARCHAR, p_name VARCHAR, p_datatype VARCHAR, p_datalen VARCHAR )
AS $$
DECLARE
rows INTEGER;
BEGIN
sql := 'INSERT INTO '||p_tblname||' (name, datatype, datalen)'
||' VALUES ('||p_name||','||p_datatype||','||p_datalen||');';
RAISE INFO 'Running SQL: %', sql;
EXECUTE sql;
GET DIAGNOSTICS rows := ROW_COUNT;
RAISE INFO 'Rows inserted = %', rows;
END
$$ LANGUAGE plpgsql;
-- CALL insert_dc_table ('test_table', 'name', 'type', 'length');
CREATE OR REPLACE PROCEDURE ShowShips3Task(
p_Register IN ship.registry_country%TYPE,
o_name OUT ship.ship_name%TYPE,
o_capitan OUT ship.captain_name%TYPE)
IS
procedure showshipsDisp(
o_cap out Ship.captain_name%type,
o_dis out Ship.displacement%type)
is
begin
Select Captain_name, Displacement
into o_cap, o_dis
from Ship Where Ship_name = 'Avrora';
end;
BEGIN
SELECT Ship_name , Captain_Name
INTO o_name, o_capitan
from Ship WHERE registry_country LIKE p_register || '%';
END;
how execute one Procedure inside another in same time?
and how can i create multivalued paramater, means that second proceduru inside depend on paramatr of first procedure?
In the example from the question nested procedure is only declared but never called. To run the nested procedure the call has to be present between BEGIN and END statements:
BEGIN
SELECT Ship_name , Captain_Name
INTO o_name, o_capitan
from Ship WHERE registry_country LIKE p_register || '%';
showshipsDisp(o_cap => ?
,o_dis => ?);
END;
Question marks should be replaced by proper variables.
I am using SQLDEVELOPER TO make a stored procedure. this is my procedure
create or replace PROCEDURE SPP
(
inpt IN VARCHAR2,
opt OUT VARCHAR2
)
AS
BEGIN
SELECT U_ID
INTO opt
FROM TABLE_NAME
WHERE U_ID=inpt;
END;
so it should return the value in opt which i can then print or whatever.
i dont know how to execute it i tried running this script
var opt VARCHAR2;
exec SPP('test_user') := opt
but it doesnt work this is my first time doing stored procs and I'm really confused any help is appreciated
how do i make it run? i can make a stored proc run with input variables but with an output variable i mess up and I cant do it without using the SELECT (item) INTO format.
In order to call the procedure, you'd need to pass in a variable that the procedure can populate. Something like
DECLARE
l_output table_name.u_id%type;
BEGIN
spp( 'test_user', l_output );
END;
Now, that being said, declaring a stored procedure whose only purpose is to query the database and return a value is generally the wrong architectural choice. That's why functions exist.
CREATE OR REPLACE FUNCTION some_function( p_input IN table_name.u_id%type )
RETURN table_name.u_id%type
IS
l_uid table_name.u_id%type;
BEGIN
SELECT u_id
INTO l_uid
FROM table_name
WHERE u_id = p_input;
RETURN l_uid;
END;
which you can then call either in a PL/SQL block
DECLARE
l_output table_name.u_id%type;
BEGIN
l_output := some_function( 'test_user' );
END;
or in a SQL statement
SELECT some_function( 'test_user' )
FROM dual;
Is there any way of calling a stored procedure from another stored procedure, and use retrieved value (from the second procedure) back in the first one?
-- procedure #1
create or replace procedure Proc1(p_RetValue out SomeDataType)
is
begin
-- any logic goes here
p_retValue := 5+5; -- for example. Let's assume that the SomeDataType is number;
end;
-- second procedure
create or replace procedure Proc2 is
l_variable number;
begin
Proc1(l_variable); -- the value 10 will be assigned to l_variable;
end;