I'd like to create a function for select and changed me data
CREATE OR REPLACE FUNCTION PublicatedTask( argument ) RETURNS SETOF task AS $$DECLARE
f task%ROWTYPE;
BEGIN
FOR f IN SELECT * FROM Task where layer IN $1 and publicationin<>0 ORDER BY id LOOP
if (f.publicationIN = 1) then
f.description='';
end if;
RETURN NEXT f;
END LOOP;
RETURN;
END;
$$
LANGUAGE 'plpgsql';
but I 'dont know what argument type?
I'd like to do SELECT * FROM PublicatedTask((1,2,3));
Thanks for your help
Or use VARIADIC:
CREATE OR REPLACE FUNCTION PublicatedTask( VARIADIC argument int[]) RETURNS SETOF task AS $$DECLARE
f task%ROWTYPE;
BEGIN
FOR f IN SELECT * FROM Task where layer = ANY($1) and publicationin<>0 ORDER BY id LOOP
if (f.publicationIN = 1) then
f.description='';
end if;
RETURN NEXT f;
END LOOP;
RETURN;
END;
$$
LANGUAGE 'plpgsql';
And use it this way:
SELECT * FROM PublicatedTask(1,2,3);
VARIADIC is available as of version 8.4: http://www.postgresql.org/docs/8.4/interactive/xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS
you could use an array of integers as parameter:
CREATE OR REPLACE FUNCTION PublicatedTask( argument int[]) RETURNS SETOF task AS $$DECLARE
f task%ROWTYPE;
BEGIN
FOR f IN SELECT * FROM Task where layer = ANY($1) and publicationin<>0 ORDER BY id LOOP
if (f.publicationIN = 1) then
f.description='';
end if;
RETURN NEXT f;
END LOOP;
RETURN;
END;
$$
LANGUAGE 'plpgsql';
Then you could call it this way:
SELECT * FROM PublicatedTask('{1,2,3}');
Related
This is what I'd like to achieve:
CREATE FUNCTION f() RETURNS trigger AS $$
BEGIN
SELECT COUNT(*) AS total_num, SUM(width) AS total_width
FROM some_table WHERE foo = NEW.foo;
IF total_num > 0 AND total_width > 100
THEN
RAISE EXCEPTION 'this is bad';
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
But it's not yet syntactically correct.
I've read I first need to DECLARE the variables (in this case total_num and total_width) so I can use those and use SELECT INTO but I've seen examples with a single variable / SELECT statement only. What if I have more of them?
You can list multiple variables in the into part. And the declare section needs to come before the first begin:
CREATE FUNCTION f() RETURNS trigger
AS $$
declare
total_num bigint;
total_width bigint;
BEGIN
SELECT COUNT(*), SUM(width)
into total_num, total_width
FROM some_table
WHERE foo = NEW.foo;
IF total_num > 0 AND total_width > 100 THEN
RAISE EXCEPTION 'this is bad';
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Edit: I'm not sure whether the emphasis here is on the use of variables or the actual IF. This is meant as an answer on the latter:
You can do this without variables using HAVING and EXISTS.
IF EXISTS (SELECT ''
FROM some_table
WHERE foo = new.foo
HAVING count(*) > 0
AND sum(width) > 100) THEN
RAISE EXCEPTION 'this is bad';
END IF;
I am trying to Create a cursor on cartesian product/join as below, it gives an error
create or replace function som1() returns integer as $$
declare
rCur cursor for (select* from t1);
er route%rowtype;
begin
for er in
select route_id, location, happy from t1, t2 where exams.pid = route.pid
loop
end loop;
return 4;
end;
$$ language plpgsql;
select som1();
I am trying to run SELECT queries in PL/pgSQL IF statements using the code below:
DO
$do$
DECLARE
query_type real;
arr real[] := array[1];
BEGIN
IF query_type = 1 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster"
WHERE ("Westminster".intersects = false AND "Westminster".area <= 100);
ELSE IF query_type = 0 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster";
END IF;
END
$do$
However I get the following error, ERROR: cannot use RETURN QUERY in a non-SETOF function.
Does anyone know how I can get the above code to work? Thank you.
UPDATE: This ended up working for me:
CREATE OR REPLACE FUNCTION my_function(query_type integer)
RETURNS SETOF "Westminster" LANGUAGE plpgsql as $$
BEGIN
IF query_type = 1 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster"
WHERE ("Westminster".intersects = false AND "Westminster".area <= 100);
ELSIF query_type = 0 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster";
END IF;
END;
$$;
I then called the function like this:
SELECT * FROM my_function(1);
From the documentation:
The code block is treated as though it were the body of a function with no parameters, returning void.
You can use RETURN QUERY only in a function returning SETOF <type> or TABLE(...). Use the table "Westminster" as the resulting type, e.g.:
CREATE OR REPLACE FUNCTION my_function(query_type int)
RETURNS SETOF "Westminster" LANGUAGE plpgsql as $$
BEGIN
IF query_type = 1 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster"
WHERE ("Westminster".intersects = false AND "Westminster".area <= 100);
ELSIF query_type = 0 THEN
RETURN QUERY
SELECT "Westminster".*
FROM "Westminster";
END IF;
END;
$$;
-- exemplary use:
SELECT * FROM my_function(1);
Note the proper use of ELSIF.
I don't think anonymous code blocks support it. Try creating a function and defining its resultset to table, e.g:
CREATE OR REPLACE FUNCTION myfunc() RETURNS TABLE (val INT) AS $$
BEGIN
RETURN QUERY SELECT 1;
END;
$$ LANGUAGE plpgsql;
To call your function you could use:
SELECT * FROM myfunc();
Note: keep in mind that the table declared on the function's header needs to have the same fields returned in the RETURN QUERY statement.
I have a postgres function that I'd like to return the result of a query, but I'd like it to return nothing if that query matches more than 1 record.
So, something like:
CREATE OR REPLACE FUNCTION myFunc(_a text, _b text)
RETURNS yy
LANGUAGE plpgsql
STABLE
PARALLEL SAFE
AS $$
BEGIN
RETURN QUERY
SELECT *
FROM yy
WHERE a = x
AND b = y;
END;
$$;
Except, it should return nothing if that query matches more than 1 record.
CREATE OR REPLACE FUNCTION myFunc(_a text, _b text)
RETURNS SETOF yy -- To be able to return "nothing"
LANGUAGE plpgsql
STABLE
PARALLEL SAFE
AS $$
DECLARE
result yy;
BEGIN
SELECT *
INTO STRICT result -- STRICT allows to check that exactly one row returned
FROM yy
WHERE a = x
AND b = y;
RETURN NEXT result; -- RETURN NEXT - return yet another row for "RETURNS SETOF" function
EXCEPTION
WHEN no_data_found OR too_many_rows THEN -- When no data or more then one rows
RETURN; -- Nothing to return, just exit
END;
$$;
i guess this can help you out.
CREATE OR REPLACE FUNCTION database.myFunction(
IN text,IN text)
RETURNS TABLE(firstField, secondField, lastField) AS
$BODY$
--sql string is the variable containing the final sql code
declare sql_string text;
declare regs numeric;
begin
--this is what happens in case count<1
sql_string = 'select 0,0,0';
--now we count them
regs = (select count(firstField) from mytable where a=b)::numeric;
--if >=1, then whe get the whole data
if (regs>=1) then
sql_string = 'select firstField,secondField, lastField from mytable where a=b';
end if;
--and return to you...
return query EXECUTE sql_string;
end;
I am new to postgres and trying to setup a function that returns a bit.
I keep getting the error
Function's final statement must be SELECT or INSERT/UPDATE/DELETE
RETURNING.
I understand that
Unless the function is declared to return void, the last statement must be a SELECT, or an INSERT, UPDATE, or DELETE that has a RETURNING clause.
here is the code
CREATE OR REPLACE FUNCTION "f"(...)
RETURNS bit AS
DO $$
Begin
IF someStuff
THEN
0; //also tried select 0 //also tried return 0
ELSE
1; //also tried select 1 //also tried return 0
END IF;
0; //also tried select 0 //also tried return 0
END $$
Where am I going wrong with the syntax?
There are several errors:
the DO is wrong in a function definition
you are missing the specification of the language
in PL/pgSQL you use return to return the function's result
So your function becomes:
CREATE OR REPLACE FUNCTION f(some_value integer)
RETURNS bit AS
$$
Begin
IF (some_value = 1)
THEN
return 0;
ELSE
return 1;
END IF;
END $$
language plpgsql
But you should use boolean instead of bit to return true/false flags:
CREATE OR REPLACE FUNCTION f(some_value integer)
RETURNS boolean AS
$$
Begin
IF (some_value = 1)
THEN
return false;
ELSE
return true;
END IF;
END $$
language plpgsql
If you want to use plpgsql then do as in the a_horse's answer but if you don't need plpgsql do in sql:
create or replace function f(some_value integer)
returns boolean as $$
select some_value = 1;
$$
language sql;
If the function is the one from this question then this will do it:
create or replace function isPersonQualifiedForJob(pid integer, jid)
returns boolean as $$
select exists (
select 1
from
getskillsforjob(jid) j
inner join
getskillsforperson(pid) p on j.skillid = p.skillid
)
$$
language sql;
Checking for exists is much faster then counting since it is enough to find the first match.