Loop through key/value pairs of a jsonb object in postgresql function












0















I am trying to create a function in Postgres that can loop through each key/value pair in a given jsonb object.



create or replace function myFunction
(input jsonb)
returns jsonb as $$
BEGIN

// foreach(key in input)
// do some math operation on its corresponding value

returns input;

END; $$


The argument input is expected to be a jsonb object, such as {"a":1, "b":2, "c":3}.



I want to loop through each key/value pair in the object. As you can tell from my comment, I used to write backend code with more general-purpose programming languages like c, java, etc. So I am not good at SQL. I have tried to search online, but they talk about how to loop through jsonb array instead of object. So really stuck here.










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  • Why the tag [sql-server]? I removed it. You only speak of Postgres ...

    – Erwin Brandstetter
    20 mins ago


















0















I am trying to create a function in Postgres that can loop through each key/value pair in a given jsonb object.



create or replace function myFunction
(input jsonb)
returns jsonb as $$
BEGIN

// foreach(key in input)
// do some math operation on its corresponding value

returns input;

END; $$


The argument input is expected to be a jsonb object, such as {"a":1, "b":2, "c":3}.



I want to loop through each key/value pair in the object. As you can tell from my comment, I used to write backend code with more general-purpose programming languages like c, java, etc. So I am not good at SQL. I have tried to search online, but they talk about how to loop through jsonb array instead of object. So really stuck here.










share|improve this question









New contributor




JaneL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Why the tag [sql-server]? I removed it. You only speak of Postgres ...

    – Erwin Brandstetter
    20 mins ago
















0












0








0








I am trying to create a function in Postgres that can loop through each key/value pair in a given jsonb object.



create or replace function myFunction
(input jsonb)
returns jsonb as $$
BEGIN

// foreach(key in input)
// do some math operation on its corresponding value

returns input;

END; $$


The argument input is expected to be a jsonb object, such as {"a":1, "b":2, "c":3}.



I want to loop through each key/value pair in the object. As you can tell from my comment, I used to write backend code with more general-purpose programming languages like c, java, etc. So I am not good at SQL. I have tried to search online, but they talk about how to loop through jsonb array instead of object. So really stuck here.










share|improve this question









New contributor




JaneL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I am trying to create a function in Postgres that can loop through each key/value pair in a given jsonb object.



create or replace function myFunction
(input jsonb)
returns jsonb as $$
BEGIN

// foreach(key in input)
// do some math operation on its corresponding value

returns input;

END; $$


The argument input is expected to be a jsonb object, such as {"a":1, "b":2, "c":3}.



I want to loop through each key/value pair in the object. As you can tell from my comment, I used to write backend code with more general-purpose programming languages like c, java, etc. So I am not good at SQL. I have tried to search online, but they talk about how to loop through jsonb array instead of object. So really stuck here.







postgresql json plpgsql






share|improve this question









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Check out our Code of Conduct.











share|improve this question









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edited 19 mins ago









Erwin Brandstetter

93.5k9180293




93.5k9180293






New contributor




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asked 48 mins ago









JaneLJaneL

1




1




New contributor




JaneL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





JaneL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






JaneL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • Why the tag [sql-server]? I removed it. You only speak of Postgres ...

    – Erwin Brandstetter
    20 mins ago





















  • Why the tag [sql-server]? I removed it. You only speak of Postgres ...

    – Erwin Brandstetter
    20 mins ago



















Why the tag [sql-server]? I removed it. You only speak of Postgres ...

– Erwin Brandstetter
20 mins ago







Why the tag [sql-server]? I removed it. You only speak of Postgres ...

– Erwin Brandstetter
20 mins ago












1 Answer
1






active

oldest

votes


















0














Use jsonb_each(jsonb) or jsonb_each_text(jsonb) in a FOR loop like:



CREATE OR REPLACE FUNCTION pg_temp.my_function(input jsonb)
RETURNS jsonb
LANGUAGE plpgsql AS -- language declaration required
$func$
DECLARE
_key text;
_value text;
BEGIN
FOR _key, _value IN
SELECT jsonb_each_text($1)
LOOP
-- do some math operation on its corresponding value
RAISE NOTICE '%: %', _key, _value;
END LOOP;

RETURN input;
END
$func$;


Call:



SELECT pg_temp.my_function('{"a":1, "b":2, "c":3}');


Related:




  • Declare variable of table type in PL/pgSQL


Note that for many problems where people used to programming languages like c, java, etc. would tend to use a loop, there is a superior set-based solution around the corner ...






share|improve this answer


























  • Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

    – JaneL
    2 mins ago











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









0














Use jsonb_each(jsonb) or jsonb_each_text(jsonb) in a FOR loop like:



CREATE OR REPLACE FUNCTION pg_temp.my_function(input jsonb)
RETURNS jsonb
LANGUAGE plpgsql AS -- language declaration required
$func$
DECLARE
_key text;
_value text;
BEGIN
FOR _key, _value IN
SELECT jsonb_each_text($1)
LOOP
-- do some math operation on its corresponding value
RAISE NOTICE '%: %', _key, _value;
END LOOP;

RETURN input;
END
$func$;


Call:



SELECT pg_temp.my_function('{"a":1, "b":2, "c":3}');


Related:




  • Declare variable of table type in PL/pgSQL


Note that for many problems where people used to programming languages like c, java, etc. would tend to use a loop, there is a superior set-based solution around the corner ...






share|improve this answer


























  • Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

    – JaneL
    2 mins ago
















0














Use jsonb_each(jsonb) or jsonb_each_text(jsonb) in a FOR loop like:



CREATE OR REPLACE FUNCTION pg_temp.my_function(input jsonb)
RETURNS jsonb
LANGUAGE plpgsql AS -- language declaration required
$func$
DECLARE
_key text;
_value text;
BEGIN
FOR _key, _value IN
SELECT jsonb_each_text($1)
LOOP
-- do some math operation on its corresponding value
RAISE NOTICE '%: %', _key, _value;
END LOOP;

RETURN input;
END
$func$;


Call:



SELECT pg_temp.my_function('{"a":1, "b":2, "c":3}');


Related:




  • Declare variable of table type in PL/pgSQL


Note that for many problems where people used to programming languages like c, java, etc. would tend to use a loop, there is a superior set-based solution around the corner ...






share|improve this answer


























  • Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

    – JaneL
    2 mins ago














0












0








0







Use jsonb_each(jsonb) or jsonb_each_text(jsonb) in a FOR loop like:



CREATE OR REPLACE FUNCTION pg_temp.my_function(input jsonb)
RETURNS jsonb
LANGUAGE plpgsql AS -- language declaration required
$func$
DECLARE
_key text;
_value text;
BEGIN
FOR _key, _value IN
SELECT jsonb_each_text($1)
LOOP
-- do some math operation on its corresponding value
RAISE NOTICE '%: %', _key, _value;
END LOOP;

RETURN input;
END
$func$;


Call:



SELECT pg_temp.my_function('{"a":1, "b":2, "c":3}');


Related:




  • Declare variable of table type in PL/pgSQL


Note that for many problems where people used to programming languages like c, java, etc. would tend to use a loop, there is a superior set-based solution around the corner ...






share|improve this answer















Use jsonb_each(jsonb) or jsonb_each_text(jsonb) in a FOR loop like:



CREATE OR REPLACE FUNCTION pg_temp.my_function(input jsonb)
RETURNS jsonb
LANGUAGE plpgsql AS -- language declaration required
$func$
DECLARE
_key text;
_value text;
BEGIN
FOR _key, _value IN
SELECT jsonb_each_text($1)
LOOP
-- do some math operation on its corresponding value
RAISE NOTICE '%: %', _key, _value;
END LOOP;

RETURN input;
END
$func$;


Call:



SELECT pg_temp.my_function('{"a":1, "b":2, "c":3}');


Related:




  • Declare variable of table type in PL/pgSQL


Note that for many problems where people used to programming languages like c, java, etc. would tend to use a loop, there is a superior set-based solution around the corner ...







share|improve this answer














share|improve this answer



share|improve this answer








edited 23 mins ago

























answered 29 mins ago









Erwin BrandstetterErwin Brandstetter

93.5k9180293




93.5k9180293













  • Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

    – JaneL
    2 mins ago



















  • Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

    – JaneL
    2 mins ago

















Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

– JaneL
2 mins ago





Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter

– JaneL
2 mins ago










JaneL is a new contributor. Be nice, and check out our Code of Conduct.










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JaneL is a new contributor. Be nice, and check out our Code of Conduct.












JaneL is a new contributor. Be nice, and check out our Code of Conduct.
















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