I have a jsonb[] column that holds JSON arrays.
A sample record would be like this:
[
{"name":"Sam","url":"example.om/sam"},
{"name":"Dan","url":"example.om/dan"}
]
I want to replace example.om with example.com everywhere in this column.
I figured the easiest way was if I treated the jsonb as a text and do a string replace, but I am having trouble converting back to jsonb. What I have so far:
update table tb
set users = replace(users, 'example.om', 'example.com')
Working solution:
update my_table
set users = replace(users::text, 'example.om', 'example.com')::jsonb[]
Related
I have a PostgreSQL table called files which includes a jsonb table called formats. While some rows are [null], others have objects with this structure:
{
"thumbnail": {
"ext": ".jpg",
"url": "https://some-url.com/image01.jpg",
"name": "image01.jpg",
//...other properties
}
}
For every row I want to update the thumbnail.url and replace some-url with other-url.
I'm far from being an expert in PostgreSQL (or any other DB for that matter), and after some reading I tried to run the following query in pgAdmin:
UPDATE files
SET formats = jsonb_set(formats, '{thumbnail.url}', REPLACE('{thumbnail.url}', 'some-url', 'other-url'))
And I received this error: function jsonb_set(jsonb, unknown, text) does not exist
I tried to set format jsonb_set(formats::jsonb...), tried to target '{thumbnail}' instead of '{thumbnail.url}' - always the same error.
What am I doing wrong? Or is pgAdmin really doesn't support this function? How can I do such an update with pgAdmin query tool?
We can try to use ->> to get JSON content value of url and then replace your expect value from that.
Because your url field of your JSON might be string type we need to use " to content it before cast as JSONB
jsonb_set(target jsonb, path text[], new_value jsonb [, create_missing boolean])
UPDATE files
SET formats = jsonb_set(formats, '{thumbnail,url}', CONCAT('"',REPLACE(formats->'thumbnail'->>'url','some-url','other-url'),'"')::JSONB);
sqlfiddle
The second parameter of jsonb_set() must be an array with one array element for each "path" element. So the second parameter should be '{thumbnail,url}' or more obvious: array['thumbnail', 'url']
And the third parameter must be a jsonb value, but replace returns a text, so you need to use e.g. to_jsonb() to convert the result of the replace() to a jsonb value.
And as D-Shih pointed out, you need to extract the old value using ->>. But to get the URL you need to "navigate" to it: formats -> 'thumbnail ->> 'url'
I would also add a WHERE clause so that you only update rows that actually contain a URL.
UPDATE files
SET formats = jsonb_set(formats,
'{thumbnail,url}',
to_jsonb(replace(formats -> 'thumbnail' ->> 'url', 'some-url', 'other-url'))
)
where (formats -> 'thumbnail') ? 'url'
I have a table:
create table table_name
(id varchar(255), details jsonb)
Then i need to update some array into "details"
update table_name
set details = '["firstLineSecondLine", "ThirdLineFourthLine"]'::jsonb
where id = '1';
How can i break lines between "firstLineSecondLine"?
I need thst my body be like:
"details": [
"firstLine
SecondLine",
"ThirdLine
FourthLine"
]
Any ideas?
literal newlines inside quotes in JSON are represented by \n. They are represented this way both on input and on output, so you will not able to get it to show up the way you want to other than converting to plain text, or something else.
Also, your example is invalid for another reason, it is lacking the outer curlies.
This seems like it would be straightforward to do but I just can not figure it out. I have a query that returns an ARRAY of strings in one of the columns. I want that array to only contain unique strings. Here is my query:
SELECT
f."_id",
ARRAY[public.getdomain(f."linkUrl"), public.getdomain(f."sourceUrl")] AS file_domains,
public.getuniqdomains(s."originUrls", s."testUrls") AS source_domains
FROM
files f
LEFT JOIN
sources s
ON
s."_id" = f."sourceId"
Here's an example of a row from my return table
_id
file_domains
source_domains
2574873
{cityofmontclair.org,cityofmontclair.org}
{cityofmontclair.org}
I need file_domains to only contain unique values, IE a 'set' instead of a 'list'. Like this:
_id
file_domains
source_domains
2574873
{cityofmontclair.org}
{cityofmontclair.org}
Use a CASE expression:
CASE WHEN public.getdomain(f."linkUrl") = public.getdomain(f."sourceUrl")
THEN ARRAY[public.getdomain(f."linkUrl")]
ELSE ARRAY[public.getdomain(f."linkUrl"), public.getdomain(f."sourceUrl")]
END
I have column options with type jsonb , in format {"names": ["name1", "name2"]} which was created with
UPDATE table1 t1 SET options = (SELECT jsonb_build_object('names', names) FROM table2 t2 WHERE t2.id= t1.id)
and where names have type jsonb array.
SELECT jsonb_typeof(names) FROM table2 give array
Now I want to extract value of names as jsonb array. But query
SELECT jsonb_build_array(options->>'names') FROM table
gave me ["[\"name1\", \"name2\"]"], while I expect ["name1", "name2"]
How can I get value in right format?
The ->> operator will return the value of the field (in your case, a JSON array) as a properly escaped text. What you are looking for is the -> operator instead.
However, note that using the jsonb_build_array on that will return an array containing your original array, which is probably not what you want either; simply using options->'names' should get you what you want.
Actually, you don't need to use jsonb_build_array() function.
Use select options -> 'names' from table; This will fix your issue.
jsonb_build_array() is for generating the array from jsonb object. You are following wrong way. That's why you are getting string like this ["[\"name1\", \"name2\"]"].
Try to execute this sample SQL script:
select j->'names'
from (
select '{"names": ["name1", "name2"]}'::JSONB as j
) as a;
In postgresql allowed array types or integer and text.But i need to create array of objects.how can i do that.
myarray text[]; //for text ['a','b','c']
myarray integer[]; //for integer[1,2,3]
I need to create the array like below
[{'dsad':1},{'sdsad':34.6},{'sdsad':23}]
I dont want to use JSON type.Using array type i need to store the array of objects.
If you're running Postgres 9.2+, you can use the JSON type.
For example, we could do
create table jsontest (id serial primary key, data json);
insert into jsontest (data) values ('[{"dsad":1},{"sdsad":34.6},{"sdsad":23}]');
And query the data with
select data->1 from jsontest;
{"sdsad":34.6}
You say:
I dont want to use JSON type
but you cannot use an ordinary array, as PostgreSQL arrays must be of homogenous types. You can't have a 2-dimensional array of text and integer.
What you could do if you don't want to use json is to create a composite type:
CREATE TYPE my_pair AS (blah text, blah2 integer);
SELECT ARRAY[ ROW('dasd',2), ROW('sdsad', 34.6), ROW('sdsad', 23) ]::my_pair[]
which will emit:
array
----------------------------------------
{"(dasd,2)","(sdsad,35)","(sdsad,23)"}
(1 row)
If you don't want that, then json is probably your best bet. Or hstore:
SELECT hstore(ARRAY['a','b','c'], ARRAY[1,2,3]::text[])
hstore
------------------------------
"a"=>"1", "b"=>"2", "c"=>"3"
(1 row)
JSON is your preferred answer, but more info as to why.
You can do something like:
SELECT array_agg(v)
FROM mytable v;
However you get something that looks like this:
{"(dsad,1)","(sdsad,34.6)","(""sdsad,var"",23)"}
It is then up to you to know how to decode this (i.e. column order). This is possible to do programmatically but is much easier with JSON.
It's hacky, but what about using an array for each property in the object (and its corresponding scalar type). If you have a data model layer in your get/read you could put the arrays "back together" into an array of objects and in your save method you would break you objects apart into synchronized arrays. This might be complicated by your example of each object not having the same properties; IDK how you'd store undefined for a property unless you're willing for null to be the same semantically.
It's not entirely clear if you mean json:
# select '[{"dsad":1},{"sdsad":34.6},{"sdsad":23}]'::json;
json
------------------------------------------
[{"dsad":1},{"sdsad":34.6},{"sdsad":23}]
(1 row)
Or an array of json:
# select array['{"dsad":1}', '{"sdsad":34.6}', '{"sdsad":23}']::json[];
array
------------------------------------------------------
{"{\"dsad\":1}","{\"sdsad\":34.6}","{\"sdsad\":23}"}
(1 row)
Or perhaps hstore? If the latter, it's only for key-values pairs, but you can likewise use an array of hstore values.
You can do something like:
SELECT JSON_AGG(v) FROM mytable v;
However you get something that looks like this:
["00000000-0000-0000-0000-000000000001","00000000-0000-0000-0000-000000000002", "00000000-0000-0000-0000-000000000003"]
exemple :
SELECT title, (select JSON_AGG(v.video_id) FROM videos v WHERE v.channel_id = c.channel_id) AS videos FROM channel AS c
Use text[] myarray insted of myarray text[].