Loop through key/value pairs of a jsonb object in postgresql function
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
New contributor
add a comment |
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
New contributor
Why the tag [sql-server]? I removed it. You only speak of Postgres ...
– Erwin Brandstetter
20 mins ago
add a comment |
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
New contributor
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
postgresql json plpgsql
New contributor
New contributor
edited 19 mins ago
Erwin Brandstetter
93.5k9180293
93.5k9180293
New contributor
asked 48 mins ago
JaneLJaneL
1
1
New contributor
New contributor
Why the tag [sql-server]? I removed it. You only speak of Postgres ...
– Erwin Brandstetter
20 mins ago
add a comment |
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
add a comment |
1 Answer
1
active
oldest
votes
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 ...
Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter
– JaneL
2 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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 ...
Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter
– JaneL
2 mins ago
add a comment |
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 ...
Thank you for your reply! Mind if I ask what is the set-based solution? @Erwin Brandstetter
– JaneL
2 mins ago
add a comment |
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 ...
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 ...
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
add a comment |
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
add a comment |
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.
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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Why the tag [sql-server]? I removed it. You only speak of Postgres ...
– Erwin Brandstetter
20 mins ago