我有一个JSON结构，其中有Sections，由多个Renders组成，包含多个Fields。
如何在最低级别（字段）上执行1次OPENJSON调用以从中获取所有信息？
以下是JSON示例：
Declare @layout NVARCHAR(MAX) = N'
{
"Sections": [
{
"SectionName":"Section1",
"SectionOrder":1,
"Renders":[
{
"RenderName":"Render1",
"RenderOrder":1,
"Fields":[
{
"FieldName":"Field1",
"FieldData":"Data1"
},
{
"FieldName":"Field2",
"FieldData":"Data2"
}
]
},
{
"RenderName":"Render2",
"RenderOrder":2,
"Fields":[
{
"FieldName":"Field1",
"FieldData":"Data1"
},
{
"FieldName":"Field2",
"FieldData":"Data2"
}
]
}
]
},
{
"SectionName":"Section2",
"SectionOrder":2,
"Renders":[
{
"RenderName":"Render1",
"RenderOrder":1,
"Fields":[
{
"FieldName":"Field1",
"FieldData":"Data1"
}
]
},
{
"RenderName":"Render2",
"RenderOrder":2,
"Fields":[
{
"FieldName":"Field1",
"FieldData":"Data1"
},
{
"FieldName":"Field2",
"FieldData":"Data2"
}
]
}
]
}
]
}
'
以下是嵌套OPENJSON调用代码的一些示例，该代码有效，但非常复杂，无法动态生成，如何进行一级调用？
SELECT SectionName, SectionOrder, RenderName, RenderOrder, FieldName, FieldData FROM (
SELECT SectionName, SectionOrder, RenderName, RenderOrder, Fields FROM (
select SectionName, SectionOrder, Renders
from OPENJSON(@layout,'$.Sections')
WITH (
SectionName nvarchar(MAX) '$.SectionName',
SectionOrder nvarchar(MAX) '$.SectionOrder',
Renders nvarchar(MAX) '$.Renders' as JSON
)
) as Sections
CROSS APPLY OPENJSON(Renders,'$')
WITH (
RenderName nvarchar(MAX) '$.RenderName',
RenderOrder nvarchar(MAX) '$.RenderOrder',
Fields nvarchar(MAX) '$.Fields' as JSON
)
) as Renders
CROSS APPLY OPENJSON(Fields,'$')
WITH (
FieldName nvarchar(MAX) '$.FieldName',
FieldData nvarchar(MAX) '$.FieldData'
)
这就是我想要实现的目标：
select FieldName, FieldData
from OPENJSON(@layout,'$.Sections.Renders.Fields')
WITH (
FieldName nvarchar(MAX) '$.Sections.Renders.Fields.FieldName',
FieldData nvarchar(MAX) '$.Sections.Renders.Fields.FieldData'
)
答案 0 :(得分：2)
虽然您只能使用一个OPENJSON，但您可以稍微简化一下查询，以便通过删除嵌套子查询来更轻松地动态创建：
SELECT SectionName, SectionOrder, RenderName, RenderOrder, FieldName, FieldData
FROM OPENJSON(@layout, '$.Sections')
WITH (
SectionName NVARCHAR(MAX) '$.SectionName',
SectionOrder NVARCHAR(MAX) '$.SectionOrder',
Renders NVARCHAR(MAX) '$.Renders' AS JSON
)
CROSS APPLY OPENJSON(Renders,'$')
WITH (
RenderName NVARCHAR(MAX) '$.RenderName',
RenderOrder NVARCHAR(MAX) '$.RenderOrder',
Fields NVARCHAR(MAX) '$.Fields' AS JSON
)
CROSS APPLY OPENJSON(Fields,'$')
WITH (
FieldName NVARCHAR(MAX) '$.FieldName',
FieldData NVARCHAR(MAX) '$.FieldData'
)
答案 1 :(得分：1)
DECLARE @json NVARCHAR(1000)
SELECT @json =
N'{
"OrderHeader": [
{
"OrderID": 100,
"CustomerID": 2000,
"OrderDetail": [
{
"ProductID": 2000,
"UnitPrice": 350
},
{
"ProductID": 3000,
"UnitPrice": 450
},
{
"ProductID": 4000,
"UnitPrice": 550
}
]
}
]
}'
SELECT
JSON_Value (c.value, '$.OrderID') as OrderID,
JSON_Value (c.value, '$.CustomerID') as CustomerID,
JSON_Value (p.value, '$.ProductID') as ProductID,
JSON_Value (p.value, '$.UnitPrice') as UnitPrice
FROM OPENJSON (@json, '$.OrderHeader') as c
CROSS APPLY OPENJSON (c.value, '$.OrderDetail') as p
Result
-------
OrderID CustomerID ProductID UnitPrice
100 2000 2000 350
100 2000 3000 450
100 2000 4000 550
答案 2 :(得分：-1)
我有JSON代码，并插入到名为MstJson的表中，包含JSON代码的列名称为JSON数据。 JSON代码：
[
{
"id":100,
"type":"donut",
"name":"Cake",
"ppu":0.55,
"batters":{
"batter":[
{
"id":"1001",
"type":"Regular"
},
{
"id":"1002",
"type":"Chocolate"
},
{
"id":"1003",
"type":"Blueberry"
},
{
"id":"1004",
"type":"Havmor",
"BusinessName":"HussainM"
},
"id",
"type"
]
},
"topping":[
{
"id":"5001",
"type":"None"
},
{
"id":"5002",
"type":"Glazed"
},
{
"id":"5005",
"type":"Sugar"
},
{
"id":"5007",
"type":"Powdered Sugar"
},
{
"id":"5006",
"type":"Chocolate with Sprinkles"
},
{
"id":"5003",
"type":"Chocolate"
},
{
"id":"5004",
"type":"Maple"
}
]
},
{
"id":"0002",
"type":"donut",
"name":"Raised",
"ppu":0.55,
"batters":{
"batter":[
{
"id":"1001",
"type":"Regular"
}
]
},
"topping":[
{
"id":"5001",
"type":"None"
},
{
"id":"5002",
"type":"Glazed"
},
{
"id":"5005",
"type":"Sugar"
},
{
"id":"5003",
"type":"Chocolate"
},
{
"id":"5004",
"type":"Maple"
}
]
},
{
"id":"0003",
"type":"donut",
"name":"Old Fashioned",
"ppu":0.55,
"batters":{
"batter":[
{
"id":"1001",
"type":"Regular"
},
{
"id":"1002",
"type":"Chocolate"
}
]
},
"topping":[
{
"id":"5001",
"type":"None"
},
{
"id":"5002",
"type":"Glazed"
},
{
"id":"5003",
"type":"Chocolate"
},
{
"id":"5004",
"type":"Maple"
}
]
}
]
使用CrossApply（嵌套数组）的OpenJson的Sql代码：
SELECT
d.ID
,a.ID
,a.Type
,a.Name
,a.PPU
,c.Batterid
,c.Battertype
FROM MstJson d
CROSS APPLY
OPENJSON(Jsondata)
WITH
(
ID NVARCHAR(MAX) '$.id'
,Type NVARCHAR(MAX) '$.type'
,Name NVARCHAR(MAX) '$.name'
,PPU DECIMAL(18, 2) '$.ppu'
,Batters NVARCHAR(MAX) '$.batters' AS JSON
) AS a
CROSS APPLY
OPENJSON(Batters, '$')
WITH
(
Batter NVARCHAR(MAX) '$.batter' AS JSON
) AS b
CROSS APPLY
OPENJSON(Batter, '$')
WITH
(
Batterid INT '$.id'
,Battertype NVARCHAR(MAX) '$.type'
) AS c
WHERE d.ID = 12; ---above Json Code is on Id 12 of Table MstJson