Update properties in SQL Json fields with nested objects - sql

Question

I'm new to JSON methods in SQL
I'm working with a huge JSON field, which has such a structure :
{
"A": 1,
"B": 2,
"C": 0,
"data": [
{
"id": "id_i_want",
"value": "[{
"prop1":7,
"prop2":"X",
"prop3":"4",
"passages":[
{
"id":0,
"number":"E24",
"date":"11/12/2019"
},
{
"id":0,
"number":"F28",
"date":"11/11/2019"
},
{
...
}
]
}]
},
{
"id": "id_i_do_NOT_want",
"value": Same structure as above
}
]
}
This JSON fields is stored in a nvarchar(MAX) field in SQLServer.
So the JSON has a property data, which contains a list of elements.
These elements have a value property, which contains a list of passages.
All the passages currently have id = 0
What I need to do :
I would like ton increment all the id of passages, starting from 1, but only the ones in the object which has the ID id_i_want, and NOT the others.
How can I do that with a SQL script ?
I tried to follow this post, but without success
Any help appreciated

Answer 1

First change the Json data to tabular data, then update the table, and then convert the table back to Json.
I have prepared the following code, you can use it easily with a little change.
declare #varData nvarchar(max) = '{
"A": 1,
"B": 2,
"C": 0,
"data": [
{
"id": "id_i_want",
"value": [{
"prop1":7,
"prop2":"X",
"prop3":"4",
"passages":[
{
"id":0,
"number":"E24",
"date":"11/12/2019"
},
{
"id":0,
"number":"F28",
"date":"11/11/2019"
}
]
}]
},
{
"id": "id_i_do_NOT_want"
}
]
}';
DECLARE #jsontable TABLE (A varchar(5), b varchar(5), c varchar(5),id NVARCHAR(50),prop1 int,prop2 varchar(5),prop3 varchar(5),mid int ,number varchar(5),date date);
DECLARE #maintable TABLE (A varchar(5), b varchar(5), c varchar(5),id NVARCHAR(50),prop1 int,prop2 varchar(5),prop3 varchar(5),mid int ,number varchar(5),date date);
insert into #jsontable
SELECT A,b,C,id,prop1,prop2,prop3,mid,number,date
FROM OPENJSON(#varData)
WITH (
A varchar(5) '$.A',
B varchar(5) '$.B',
C varchar(5) '$.C',
jdata NVARCHAR(MAX) '$.data' AS JSON
)
OUTER APPLY OPENJSON(jdata)
WITH (
id NVARCHAR(50) '$.id',
jvalue NVARCHAR(MAX) '$.value' AS JSON
)
OUTER APPLY OPENJSON(jvalue)
WITH (
prop1 int '$.prop1',
prop2 varchar(5) '$.prop2',
prop3 varchar(5) '$.prop3',
jpassages NVARCHAR(MAX) '$.passages' AS JSON
)
OUTER APPLY OPENJSON(jpassages)
WITH (
mid int '$.id',
number varchar(5) '$.number',
date date '$.date'
)
where id = 'id_i_want'
Declare #A varchar(5)
Declare #b varchar(5)
Declare #c varchar(5)
Declare #id NVARCHAR(50)
Declare #prop1 int
Declare #prop2 varchar(5)
Declare #prop3 varchar(5)
Declare #mid int = 0
Declare #number varchar(5)
Declare #date date
While((Select Count(*) From #jsontable)>0)
Begin
set #mid = #mid + 1
Set #A=(Select Top 1 A From #jsontable)
Set #B=(Select Top 1 B From #jsontable)
Set #C=(Select Top 1 C From #jsontable)
Set #id=(Select Top 1 id From #jsontable)
Set #prop1=(Select Top 1 prop1 From #jsontable)
Set #prop2=(Select Top 1 prop2 From #jsontable)
Set #prop3=(Select Top 1 prop3 From #jsontable)
Set #number=(Select Top 1 number From #jsontable)
Set #date=(Select Top 1 date From #jsontable)
insert into #maintable values
(#A,#B,#C,#id,#prop1,#prop2,#prop3,#mid,#number,#date)
Delete #jsontable Where A=#A and B = #B and C = #C and id = #id and prop1 = #prop1
and prop2 = #prop2 and prop3 = #prop3 and number = #number and date = #date
End
select * from #maintable
demo in db<>fiddle