SQL- Merging json with a node name - sql

Question

I have a table with json vaules in nvarchar columns
ID ConfigKey ConfigValue
1 employee {"name":"jhon","age":"23","salary":"5000"}
2 Dept {"name": "Marketing", "code":"12", "manager":"sam"}
3 manager {"managername":"abc", "dept":"AB"}
I need to get merged json for selected ConfiKey by adding ConfigKey value as node name for the ConfigValue and also merged json as below.
For example when i want to get for employee and manager. Output should be like
{
"employee": {
"name": "jhon",
"age": "23",
"salary": "5000"
},
"manager": {
"managername": "abc",
"dept": "AB"
}
}
When I want to get for only ConfigKey value employee output should be
{
"employee": {
"name": "jhon",
"age": "23",
"salary": "5000"
}
}
I tried using JSON_MODIFY but couldn't achieve this. How I can achieve this in SQL query.

Answer 1

You can do this with PIVOT and JSON_QUERY but the code will quickly get messy as you add more ConfigKey rows...
/*
* Setup example type, table and data...
*/
create type ConfigKeyTableType as table (
ConfigKey nvarchar(10)
);
create table dbo.Example (
ID int,
ConfigKey nvarchar(10),
ConfigValue nvarchar(max)
);
insert dbo.Example (ID, ConfigKey, ConfigValue) values
(1, N'employee', N'{"name":"jhon","age":"23","salary":"5000"}'),
(2, N'Dept', N'{"name": "Marketing", "code":"12", "manager":"sam"}'),
(3, N'manager', N'{"managername":"abc", "dept":"AB"}');
go
/*
* Stored procedure to return the JSON based on the supplied ConfigKey values...
*/
create procedure dbo.usp_GetConfigJSON (
#ConfigKeys ConfigKeyTableType readonly
)
as
begin
set nocount on;
select
json_query(dept) as [dept],
json_query(employee) as [employee],
json_query(manager) as [manager]
from (
select Ex.ConfigKey, Ex.ConfigValue
from dbo.Example Ex
join #ConfigKeys keys on keys.ConfigKey=Ex.ConfigKey
) src
pivot (max(ConfigValue) for ConfigKey in ([dept], [employee], [manager])) pvt
for json auto, without_array_wrapper;
end
go
To invoke it from SQL...
declare #ConfigKeys ConfigKeyTableType;
insert #ConfigKeys (ConfigKey) values
(N'employee'),
(N'manager');
exec dbo.usp_GetConfigJSON #ConfigKeys;
go
declare #ConfigKeys ConfigKeyTableType;
insert #ConfigKeys (ConfigKey) values
(N'employee');
exec dbo.usp_GetConfigJSON #ConfigKeys;
go
Which yields the results...
{
"employee": {
"name": "jhon",
"age": "23",
"salary": "5000"
},
"manager": {
"managername": "abc",
"dept": "AB"
}
}
...and...
{
"employee": {
"name": "jhon",
"age": "23",
"salary": "5000"
}
}