Update an existing JSON value inside a JSON Array in SQL - sql

Question

I want to update an existing JSON value inside a JSON array. I can append a new JSON to the JSON array using JSON_MODIFY. Suppose i have a JSON like :
[{"id":"101","name":"John"}, {"id":"102","name":"peter"}]
But i want to update only the json with id=102.
Is it possible using JSON_MODIFY()?
EDIT:
Actual data
{"Details":{"SId":{"Type":"string","Value":"1234"},"BookList":{"Type":"List","Value":[{"id": "101", "name": "Book1"},{"id": "102", "name": "Book2"}]},"SName":{"Type":"string","Value":"john"}}}

Answer 1

You could use CTE to parse it and combine path in UPDATE part:
WITH cte AS (
SELECT *
FROM t
CROSS APPLY OPENJSON(c) s
WHERE i = 1
AND JSON_VALUE(s.value, '$.id')=102
)
UPDATE cte
SET c = JSON_MODIFY(c, '$[' + cte.[key] + '].name', 'Joe');
DBFiddle Demo
Output:
-- Before
[{"id":"101","name":"John"}, {"id":"102","name":"peter"}]
-- After
[{"id":"101","name":"John"}, {"id":"102","name":"Joe"}]
This will work on SQL Server 2017+ or SQL Azure DB otherwise you will get error. More info about path literal

Answer 2

Updating JSON Data (Postgresql)
If the column in your table contains json data and you want to update this data, you can use the following structure:
UPDATE table_name SET column_name = '{"key" : value}'::jsonb
WHERE column_name::jsonb #> '{“new_key” : new_value}'::jsonb;
Note: Usually #> is used as the "contains" operator.

Answer 3

The best way is to generate the statement like this:
In this way you, won't get the error of "Cannot resolve the collation conflict between Latin1_General_BIN and SQL_Latin1_General_CP1_CI_AS"
Also, you won't get this error "The argument 2 of the JSON_MODIFY must be a string literal"
WITH cte AS (
SELECT
t.PrimaryKey,
JSON_VALUE([value], '$.id') as id,
t.JsonColumn,
o.*
,('UPDATE MyTable set JsonColumn = JSON_MODIFY(JsonColumn, ''$['+[key]+'].id'', ''NewVALUE'') WHERE PrimaryKey = '''+t.PrimaryKey COLLATE SQL_Latin1_General_CP1_CI_AS+ '''') as statement
FROM MyTable t
CROSS APPLY OPENJSON(JSON_QUERY(JsonColumn, '$')) o WHERE JSON_VALUE(o.value, '$.Id')= 1
)
select * from cte;