I am trying to create a PostgreSQL function which will update a list of rows. So I want to take a list of text[] as an argument and use the IN clause to execute the query. Also, i want to get the number of rows updated as a returned value.
This worked for me:
CREATE FUNCTION set_mail_isbeingused(list_of_mail_names text[]) RETURNS void AS $$
BEGIN
FOR i in 1 .. array_upper(list_of_mail_names,1)
LOOP
UPDATE mail_isbeingused set isbeingused = 'true' where mailname = list_of_mail_names[i];
END LOOP;
END;
$$
LANGUAGE plpgsql;
But i want to execute it in one update query with IN clause.
CREATE FUNCTION set_mail_isbeingused(list_of_mail_names text[]) RETURNS void AS $$
BEGIN
UPDATE mail_isbeingused set isbeingused = 'true' where mailname in list_of_mail_names;
END;
$$
LANGUAGE plpgsql;
This is what I have been trying to do. Can somebody help me in fixing this?
You need to use the ANY operator with an array. You can't use IN
To obtain the number of rows update, use GET DIAGNOSTICS
CREATE FUNCTION set_mail_isbeingused(list_of_mail_names text[])
RETURNS integer --<< you need to change the return type
AS $$
DECLARE
l_rows integer;
BEGIN
UPDATE mail_isbeingused
set isbeingused = true
where mailname = ANY (list_of_mail_names);
GET DIAGNOSTICS l_rows = ROW_COUNT; --<< get the number of affected rows
RETURN l_rows;
END;
$$
LANGUAGE plpgsql;
Boolean constants don't need to be put into single quotes true is a boolean value 'true' is a string constant.
Related
I'm a beginner in plpgsql and working on a project which requires me to write a function that returns two variables in the form of 2 columns (res,Result). I've done a quite a bit of searching but didn't find answer for the same. The reference to my code is below
CREATE OR REPLACE FUNCTION propID(character varying)
RETURNS SETOF RECORD AS $val$
DECLARE
t_row record;
res BOOLEAN;
result character varying;
value record;
BEGIN
FOR t_row IN SELECT property_id FROM property_table WHERE ward_id::TEXT = $1 LOOP
RAISE NOTICE 'Analyzing %', t_row;
res := false; -- here i'm going to replace this value with a function whos return type is boolean in future
result := t_row.property_id;
return next result; --here i want to return 2 variables (res,result) in the form of two columns (id,value)
END LOOP;
END;
$val$
language plpgsql;
Any help on the above query would be very much appreciated.
Assuming that property_id and ward_id are integers you can achieve your goal in a simple query like this:
select some_function_returning_boolean(property_id), property_id
from property_table
where ward_id = 1; -- input parameter
If you absolutely need a function, it can be an SQL function like
create or replace function prop_id(integer)
returns table (res boolean, id int) language sql
as $$
select some_function_returning_boolean(property_id), property_id
from property_table
where ward_id = $1
$$;
In a plpgsql function you should use return query:
create or replace function prop_id(integer)
returns table (res boolean, id int) language plpgsql
as $$
begin
return query
select some_function_returning_boolean(property_id), property_id
from property_table
where ward_id = $1;
end
$$;
Below is my function, even after having a RETURN statement, but a
query has no destination for result data
error is thrown. Am I missing something?
CREATE OR REPLACE FUNCTION test(ulds character varying)
RETURNS boolean AS
$BODY$
DECLARE
val_result boolean;
BEGIN
select * from regexp_split_to_array('BLK&AAK&AKE', '&');
SET val_result = false;
RETURN val_result;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION test(character varying)
There are more than one issues:
Result of unbind queries is not result of function in Postgres. You need to use INTO clause.
regexp_split_to_array is scalar function, there is not any reason to call this function from SELECT statement. Use SELECT only when you take result of table function, or when you need to read data from relations.
assign statement in plpgsql is based on := symbol. The command SET is used for something different.
the type text is proffered against varchar for function's parameters.
So your code can looks like:
CREATE OR REPLACE FUNCTION test(ulds text)
RETURNS boolean AS $$
DECLARE
result boolean;
target text[];
BEGIN
-- suboptimal, don't do this!!!
SELECT regexp_split_to_array('BLK&AAK&AKE', '&') INTO target;
-- preferred
target := regexp_split_to_array('BLK&AAK&AKE', '&');
result := true;
RETURN result;
END;
$$ LANGUAGE plpgsql;
I am using trigger in Postgres database to call function and send newly inserted row to NodeJs application
CREATE OR REPLACE FUNCTION triggerFunction() RETURNS trigger AS $$
DECLARE
BEGIN
PERFORM pg_notify('tableName', row_to_json(NEW)::text );
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
This returns the whole row in json format. However I need to change one of the column name while this row is returned.
Unfortunately AS keywork doesnt work in the row to json with NEW.COLUMN_NAME AS NEW_COLUMN. How can we achieve the solution for this?
CREATE OR REPLACE FUNCTION triggerFunction() RETURNS trigger AS $$
DECLARE
ret json;
BEGIN
select row_to_json(x) into ret from
(select NEW.abc as def, NEW.jkl, NEW.col3) x;
PERFORM pg_notify('tableName', ret::text );
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
I am call the function but it is returning error that array value must start with "{" or dimension information using
Create or Replace Function get_post_process_info(IN v_esdt_pp character varying[])
Returns setof Record as
$$
Declare
post_processes RECORD;
esdt_value character varying;
v_sdsname character varying[];
v_dimension character varying[];
counter int := 1;
Begin
-- to loop through the array and get the values for the esdt_values
FOR esdt_value IN select * from unnest(v_esdt_pp)
LOOP
-- esdt_values as a key for the multi-dimensional arrays and also as the where clause value
SELECT distinct on ("SdsName") "SdsName" into v_sdsname from "Collection_ESDT_SDS_Def" where "ESDT" = esdt_values;
raise notice'esdt_value: %',esdt_value;
END LOOP;
Return ;
End
$$ Language plpgsql;
Select get_post_process_info(array['ab','bc]);
Your function sanitized:
CREATE OR REPLACE FUNCTION get_post_process_info(v_esdt_pp text[])
RETURNS SETOF record AS
$func$
DECLARE
esdt_value text;
v_sdsname text[];
v_dimension text[];
counter int := 1;
BEGIN
FOR esdt_value IN
SELECT * FROM unnest(v_esdt_pp) t
LOOP
SELECT distinct "SdsName" INTO v_sdsname
FROM "Collection_ESDT_SDS_Def"
WHERE "ESDT" = esdt_value;
RAISE NOTICE 'esdt_value: %', esdt_value;
END LOOP;
END
$func$ Language plpgsql;
Call:
Select get_post_process_info('{ab,bc}'::text[]);
DISTINCT instead of DISTINCT ON, missing table alias, formatting, some cruft, ...
Finally the immediate cause of the error: a missing quote in the call.
The whole shebang can possibly be replaced with a single SQL statement.
But, obviously, your function is incomplete. Nothing is returned yet. Information is missing.
I've got a pretty simple function defined like so:
CREATE OR REPLACE FUNCTION create_new_order(....) RETURNS integer AS
$BODY$
BEGIN
PERFORM add_points_to_usage(client_id_p, date_in_p, total_points_p);
INSERT INTO orders (...) VALUES (...)
RETURNING ident;
END;
$BODY$ LANGUAGE plpgsql;
Where I'm struggling is how to actually RETURN the value stored in the ident field back via the RETURNING clause. I've tried setting the value to a variable but that either doesn't work or I'm just messing up the syntax.
You're missing the variable declaration, the INTO clause and the final RETURN:
CREATE OR REPLACE FUNCTION create_new_order(....) RETURNS integer AS
$BODY$
DECLARE
var_ident int;
BEGIN
PERFORM add_points_to_usage(client_id_p, date_in_p, total_points_p);
INSERT INTO orders (...) VALUES (...)
RETURNING ident INTO var_ident;
RETURN var_ident;
END;
$BODY$ LANGUAGE plpgsql;