I need to migrate jsonb (Flyway migration) column from
{
"property1":
{
"type": "A",
"value": "value1"
},
"property2":
{
"type": "B",
"value" "value2"
}
}
into simplified
{
"property1": "value1",
"property2": "value2"
}
So far, I have
update sms_notification n
set param2 = jsonb_object(
array(select jsonb_object_keys(n.params)),
'dummyValue'
)
producing
{
"property1": "dummyValue",
"property2": "dummyValue"
But I can't figure out how to extract the values (value1/value2) from the property1/property2 object.
you need to unnest all keys using jsonb_each() then aggregate the key/values back into a single object:
update sms_notification
set param2 = (select jsonb_object_agg(m.key, m.item -> 'value')
from jsonb_each(param2) as m(key, item));
Related
I have a jsonb object like this:
{
"members": [
[
"1966-07-31",
null,
{
"last_name": "ss",
"first_name": "ss"
}
],
[
"1968-12-17",
"spouse",
{
"last_name": "kk",
"first_name": "kk"
}
]
]
}
I want to convert it to.
{
"applicants": [
{
"last_name": "ss",
"first_name": "ss"
}
{
"last_name": "kk",
"first_name": "kk"
}
]
}
Essentially taking the third element of each member and putting is an object in a new array 'applicant'. I don't need the member data that is outside the object.
I can run a PHP script to loop through all the rows and update it. But I'm wondering if I can write this in plain sql query?
Thanks.
You should use jsonb_array_elements with two CROSS JOIN for extract JSON array data then aggregate them
Dynamic array:
Demo
select
jsonb_build_object('applicants', jsonb_agg(e2.value))
from
test t
cross join jsonb_array_elements(t.obj -> 'members') as e1
cross join jsonb_array_elements(e1.value) as e2
where
e2.value ? 'first_name'
and e2.value ? 'last_name'
Static array:
If your structure is specific you don't need a loop over the array and can use the below query:
Demo
select
jsonb_build_object('applicants', jsonb_agg(e1.value -> 2))
from
test t
cross join jsonb_array_elements(t.obj -> 'members') as e1
I am looking to you for help in adding a property to a json object nested in 2 arrays.
Table Example :
CREATE TABLE events (
seq_id BIGINT PRIMARY KEY,
data JSONB NOT NULL,
evt_type TEXT NOT NULL
);
example of my JSONB data column in my table:
{
"Id":"1",
"Calendar":{
"Entries":[
{
"Id": 1,
"SubEntries":[
{
"ExtId":{
"Id":"10",
"System": "SampleSys"
},
"Country":"FR",
"Details":[
{
"ItemId":"1",
"Quantity":10,
},
{
"ItemId":"2",
"Quantity":3,
}
],
"RequestId":"222",
"TypeId":1,
}
],
"OrderResult":null
}
],
"OtherThingsArray":[
]
}
}
So I need to add new properties into a SubEntries object based on the Id value of the ExtId object (The where clause)
How can I do that please ?
Thanks a lot
You can use jsonb_set() for this, which takes jsonpath assignments as a text[] (array of text values) as
SELECT jsonb_set(
input_jsonb,
the starting jsonb document
path_array '{i,j,k[, ...]}'::text[],
the path array, where the series {i, j, k} progresses at each level with either the (string) key or (integer) index (starting at zero)denoting the new key (or index) to populate
new_jsonb_value,
if adding a key-value pair, you can use something like to_jsonb('new_value_string'::text) here to force things to format correctly
create_if_not_exists_boolean
if adding new keys/indexes, give this as true so they'll be appended; otherwise you'll be limited to overwriting existing keys
)
Example
json
{
"array1": [
{
"id": 1,
"detail": "test"
}
]
}
SQL
SELECT
jsonb_set('{"array1": [{"id": 1, "detail": "test"}]}'::jsonb,
'{array1,0,update}'::TEXT[],
to_jsonb('new'::text),
true
)
Output
{
"array1": [
{
"id": 1,
"upd": "new",
"detail": "test"
}
]
}
Note that you can only add 1 nominal level of depth at a time (i.e. either a new key or a new index entry), but you can circumvent this by providing the full depth in the assignment value, or by using jsonb_set() iteratively:
select
jsonb_set(
jsonb_set('{"array1": [{"id": 1, "detail": "test"}]}'::jsonb, '{array1,0,upd}'::TEXT[], '[{"new": "val"}]'::jsonb, true),
'{array1,0,upd,0,check}'::TEXT[],
'"test_val"',
true)
would be required to produce
{
"array1": [
{
"id": 1,
"upd": [
{
"new": "val",
"check": "test_val"
}
],
"detail": "test"
}
]
}
If you need other, more complex logic to evaluate which values need to be added to which objects, you can try:
dynamically creating a set of jsonb_set() statements for execution
using the outputs from queries of jsonb_each() and jsonb_array_elements() to evaluate the row logic down at the SubEntities level, and then using jsonb_object_agg() and jsonb_agg() as appropriate to build the document back up to the root level from the resultant object-arrays and key-value collections
I was going through the Postgres Jsonb documentation but was unable to find a solution for a small issue I'm having.
I've got a table : MY_TABLE
that has the following columns:
User, Name, Data and Purchased
One thing to note is that "Data" is a jsonb and has multiple fields. One of the fields inside of "Data" is "Attribute" but the values it can hold are not in sync. What I mean is, it could be a string, a list of strings, an empty list, or just an empty string. However, I want to change this.
The only values that I want to allow are a list of strings and an empty list. I want to convert all the empty strings to empty lists and regular strings to a list of strings.
I have tried using json_build_array but have not had any luck
So for example, I'd want my final jsonb to look like :
[{
"Id": 1,
"Attributes": ["Test"]
},
{
"Id": 2,
"Attributes": []
},
{
"Id": 3,
"Attributes": []
}]
when converted from
{
"Id": 1,
"Attributes": "Test"
},
{
"Id": 2,
"Attributes": ""
},
{
"Id": 3,
"Attributes": []
}
]
I only care about the "Attributes" field inside of the Json, not any other fields.
I also want to ensure for some Attributes that have an empty string "Attributes": "", they get mapped to an empty list and not a list with an empty string ([] not [""])
I also want to preserve the empty array values ([]) for the Attributes that already hold an empty array value.
This is what I have so far:
jsonb_set(
mycol,
'{Attributes}',
case when js ->> 'Attributes' <> ''
then jsonb_build_array(js ->> 'Attributes')
else '[]'::jsonb
end
)
However, Attributes: [] is getting mapped to ["[]"]
Use jsonb_array_elements() to iterate over the elements of each 'data' cell and jsonb_agg to regroup the transform values together into an array:
WITH test_data(js) AS (
VALUES ($$ [
{
"Id": 1,
"Attributes": "Test"
},
{
"Id": 2,
"Attributes": ""
},
{
"Id": 3,
"Attributes": []
}
]
$$::JSONB)
)
SELECT transformed_elem
FROM test_data
JOIN LATERAL (
SELECT jsonb_agg(jsonb_set(
elem,
'{Attributes}',
CASE
WHEN elem -> 'Attributes' IN ('""', '[]') THEN '[]'::JSONB
WHEN jsonb_typeof(elem -> 'Attributes') = 'string' THEN jsonb_build_array(elem -> 'Attributes')
ELSE elem -> 'Attributes'
END
)) AS transformed_elem
FROM jsonb_array_elements(test_data.js) AS f(elem) -- iterate over every element in the array
) s
ON TRUE
returns
[{"Id": 1, "Attributes": ["Test"]}, {"Id": 2, "Attributes": []}, {"Id": 3, "Attributes": []}]
I have the following json object stored into a jsonb column
{
"msrp": 6000,
"data": [
{
"supplier": "a",
"price": 5775
},
{
"supplier": "b",
"price": 6129
},
{
"supplier": "c",
"price": 5224
},
{
"supplier": "d",
"price": 5775
}
]
}
There's a few things I'm trying to do but completely stuck on :(
Check if a supplier exists inside this array. So if I'm looking up if "supplier": "e" is in here. Here's what I tried but didn't work. "where data #> '{"supplier": "e"}'"
(optional but really nice to have) Before returning results if I do a select *, inject into each array a "price_diff" so that I can see the difference between msrp and the supplier price as such.
{
"supplier": "d",
"price": 5775,
"price_diff": 225
}
where data #> '{"supplier": "e"}'
Do you have a column named data? You can't just treat a JSONB key name as if it were a column name.
Containment starts from the root.
colname #> '{"data":[{"supplier": "e"}]}'
You can redefine the 'root' dynamically though:
colname->'data' #> '[{"supplier": "e"}]'
Given a jsonb and set of keys how can I get a new jsonb with required keys.
I've tried extracting key-values and assigned to text[] and then using jsonb_object(text[]). It works well, but the problem comes when a key has a array of jsons.
create table my_jsonb_table
(
data_col jsonb
);
insert into my_jsonb_table (data_col) Values ('{
"schemaVersion": "1",
"Id": "20180601550002",
"Domains": [
{
"UID": "29aa2923",
"quantity": 1,
"item": "book",
"DepartmentDomain": {
"type": "paper",
"departId": "10"
},
"PriceDomain": {
"Price": 79.00,
"taxA": 6.500,
"discount": 0
}
},
{
"UID": "bbaa2923",
"quantity": 2,
"item": "pencil",
"DepartmentDomain": {
"type": "wood",
"departId": "11"
},
"PriceDomain": {
"Price": 7.00,
"taxA": 1.5175,
"discount": 1
}
}
],
"finalPrice": {
"totalTax": 13.50,
"total": 85.0
},
"MetaData": {
"shopId": "1405596346",
"locId": "95014",
"countryId": "USA",
"regId": "255",
"Date": "20180601"
}
}
')
This is what I am trying to achieve :
SELECT some_magic_fun(data_col,'Id,Domains.UID,Domains.DepartmentDomain.departId,finalPrice.total')::jsonb FROM my_jsonb_table;
I am trying to create that magic function which extracts the given keys in a jsonb format, as of now I am able to extract scalar items and put them in text[] and use jsonb_object. but don't know how can I extract all elements of array
expected output :
{
"Id": "20180601550002",
"Domains": [
{
"UID": "29aa2923",
"DepartmentDomain": {
"departId": "10"
}
},
{
"UID": "bbaa2923",
"DepartmentDomain": {
"departId": "11"
}
}
],
"finalPrice": {
"total": 85.0
}
}
I don't know of any magic. You have to rebuild it yourself.
select jsonb_build_object(
-- Straight forward
'Id', data_col->'Id',
'Domains', (
-- Aggregate all the "rows" back together into an array.
select jsonb_agg(
-- Turn each array element into a new object
jsonb_build_object(
'UID', domain->'UID',
'DepartmentDomain', jsonb_build_object(
'departId', domain#>'{DepartmentDomain,departId}'
)
)
)
-- Turn each element of the Domains array into a row
from jsonb_array_elements( data_col->'Domains' ) d(domain)
),
-- Also pretty straightforward
'finalPrice', jsonb_build_object(
'total', data_col#>'{finalPrice,total}'
)
) from my_jsonb_table;
This probably is not a good use of a JSON column. Your data is relational and would better fit traditional relational tables.