T-SQL OpenJson Nested Array - json

Question

Iam Struggling with following JSOn Structure
Declare #Json Nvarchar(max)
Set #Json = '
{
"entities": [
{
"Fields": [
{
"Name": "test-id",
"values": [
{
"value": "1851"
}
]
},
{
"Name": "test-name",
"values": [
{
"value": "01_DUMMY"
}
]
}
],
"Type": "run",
"children-count": 0
},
{
"Fields": [
{
"Name": "test-id",
"values": [
{
"value": "1852"
}
]
},
{
"Name": "test-name",
"values": [
{
"value": "02_DUMMY"
}
]
}
],
"Type": "run",
"children-count": 0
}
],
"TotalResults": 2
}'
My Output should look like this:
test-id|test-name|Type|Children-count
1851 |01_DUMMY |run |0
1852 |02_DUMMY |run |0
I tried to use the Examples posted here but none is matching my Needs.
My closest apporach was this T-SQL Syntax
Select
*
From OPENJSON (#JSON,N'$.entities') E
CROSS APPLY OPENJSON (E.[value]) F
CROSS APPLY OPENJSON (F.[value],'$') V where F.type = 4
My next idea was to use this SQL CODE to open the next nested Array but iam always getting an error msg(
Lookup Error - SQL Server Database Error: Incorrect syntax near the
keyword 'CROSS'.
)
Select
*
From OPENJSON (#JSON,N'$.entities') E
CROSS APPLY OPENJSON (E.[value]) F
CROSS APPLY OPENJSON (F.[value]) V where F.type = 4
CROSS APPLY OPENJSON (V.[value]) N
Iam not sure how to get Closer to my needed Output.
To be honest I just started with T-SQL and never worked before with JSON Files.
Regards Johann

Answer 1

This is rather deeply nested. I think, you've got the right idea to dive deeper and deeper using a serie of OPENJSON. Try it like this to get your values:
Declare #Json Nvarchar(max)
Set #Json = '
{
"entities": [
{
"Fields": [
{
"Name": "test-id",
"values": [
{
"value": "1851"
}
]
},
{
"Name": "test-name",
"values": [
{
"value": "01_DUMMY"
}
]
}
],
"Type": "run",
"children-count": 0
},
{
"Fields": [
{
"Name": "test-id",
"values": [
{
"value": "1852"
}
]
},
{
"Name": "test-name",
"values": [
{
"value": "02_DUMMY"
}
]
}
],
"Type": "run",
"children-count": 0
}
],
"TotalResults": 2
}';
--This is the query
WITH ReadJson AS
(
SELECT A.TotalResults
,C.[Type]
,C.[children-count]
,D.[Name]
,E.*
FROM OPENJSON(#Json)
WITH(TotalResults INT, entities NVARCHAR(MAX) AS JSON) A
CROSS APPLY OPENJSON(A.entities) B
CROSS APPLY OPENJSON(B.[value])
WITH(Fields NVARCHAR(MAX) AS JSON,[Type] VARCHAR(100),[children-count] INT) C
CROSS APPLY OPENJSON(C.Fields)
WITH([Name] VARCHAR(100),[values] NVARCHAR(MAX) AS JSON) D
CROSS APPLY OPENJSON(D.[values])
WITH([value] VARCHAR(100)) E
)
SELECT * FROM ReadJson;
The result
+---+-----+---+-----------+----------+
| 2 | run | 0 | test-id | 1851 |
+---+-----+---+-----------+----------+
| 2 | run | 0 | test-name | 01_DUMMY |
+---+-----+---+-----------+----------+
| 2 | run | 0 | test-id | 1852 |
+---+-----+---+-----------+----------+
| 2 | run | 0 | test-name | 02_DUMMY |
+---+-----+---+-----------+----------+
Do you think you can manage the rest?