Sql server 从sql查询生成json

我有以下情况：

class question {
    idQuestion: string;
    question: string;
    type: string;
}

class options {
    idOption: string;
    option: string;
}

我的SQL返回：

idquestion question type idoption option

i、 e:

我想将SQL响应映射到以下接口：

questionOptions{
    question: Question;
    options: Option[];
}

我怎样才能做到这一点？所以最后，我可以有一个问题列表，每个问题都有自己的选择

附言：在问题和sql数据库中的选项之间建立关联是更好的选择吗

编辑：

从示例数据中，我希望获得以下json：

[
  {
    idQuestion: "question1",
    question: "foo?",
    options: []
  },
  {
    idQuestion: "question2",
    question: "bar?"
    options: [
      {
        idOption: "option1",
        option: "aaa"
      },
      {
        idOption: "option2",
        option: "bbb"
      },
    ]
  }
]

---

我有一个helper函数，它可以将几乎任何行/数据集转换为JSON字符串/数组

假设2012年+

Declare @YourData table (idQuestion varchar(50),question varchar(50), type varchar(50),idOption varchar(50),[option] varchar(50))
Insert Into @YourData values
('question1','foo?','textbox', null, null),
('question2','bar?','select','option1','aaa'),
('question2','bar?','select','option2','bbb'),
('question3','foobar?','radio','option1','aaa'),
('question3','foobar?','radio','option2','bbb'),
('question3','foobar?','radio','option3','ccc')


Declare @JSON varchar(max) = ''
Select @JSON=@JSON+','+String
 From  (
        Select String=Replace(B.JSON,'}',',"options":'+IsNull(C.JSON,'[]')+'}')
         From (Select Distinct idquestion,question From @YourData) A
         Cross Apply (Select JSON=[dbo].[udf-Str-JSON](0,0,(Select A.idQuestion,A.question  for XML RAW))) B
         Cross Apply (Select JSON=[dbo].[udf-Str-JSON](0,0,(Select idOption,[option] from @YourData Where idquestion=A.idquestion  for XML RAW))) C
       ) A

Select '['+Stuff(@JSON,1,1,'')+']'

返回

UDF

CREATE FUNCTION [dbo].[udf-Str-JSON] (@IncludeHead int,@ToLowerCase int,@XML xml)
Returns varchar(max)
AS
Begin
    Declare @Head varchar(max) = '',@JSON varchar(max) = ''
    ; with cteEAV as (Select RowNr     =Row_Number() over (Order By (Select NULL))
                            ,Entity    = xRow.value('@*[1]','varchar(100)')
                            ,Attribute = xAtt.value('local-name(.)','varchar(100)')
                            ,Value     = xAtt.value('.','varchar(max)') 
                       From  @XML.nodes('/row') As R(xRow) 
                       Cross Apply R.xRow.nodes('./@*') As A(xAtt) )
          ,cteSum as (Select Records=count(Distinct Entity)
                            ,Head = IIF(@IncludeHead=0,IIF(count(Distinct Entity)<=1,'[getResults]','[[getResults]]'),Concat('{"status":{"successful":"true","timestamp":"',Format(GetUTCDate(),'yyyy-MM-dd hh:mm:ss '),'GMT','","rows":"',count(Distinct Entity),'"},"retults":[[getResults]]}') ) 
                       From  cteEAV)
          ,cteBld as (Select *
                            ,NewRow=IIF(Lag(Entity,1)  over (Partition By Entity Order By (Select NULL))=Entity,'',',{')
                            ,EndRow=IIF(Lead(Entity,1) over (Partition By Entity Order By (Select NULL))=Entity,',','}')
                            ,JSON=Concat('"',IIF(@ToLowerCase=1,Lower(Attribute),Attribute),'":','"',Value,'"') 
                       From  cteEAV )
    Select @JSON = @JSON+NewRow+JSON+EndRow,@Head = Head From cteBld, cteSum
    Return Replace(@Head,'[getResults]',Stuff(@JSON,1,1,''))
End
-- Parameter 1: @IncludeHead 1/0
-- Parameter 2: @ToLowerCase 1/0 (converts field name to lowercase
-- Parameter 3: (Select * From ... for XML RAW)

CREATE FUNCTION[dbo].[udf Str JSON]（@IncludeHead int、@ToLowerCase int、@XML）
返回varchar（最大值）
作为
开始
声明@Head varchar（max）=''，@JSON varchar（max）=''
; 将cteEAV设置为（选择RowNr=行号（）覆盖（订单编号（选择NULL））
，Entity=xRow.value（'@*[1]'，'varchar（100）'
，Attribute=xAtt.value（'local-name（.）'，'varchar（100）'
，Value=xAtt.Value（'.'，'varchar（max）'
从@XML.nodes（'/row'）作为R（xRow）
交叉应用R.xRow.nodes（'./@*'）作为（xAtt））
，cteSum as（选择记录=计数（不同实体）
，Head=IIF（@IncludeHead=0，IIF（计数（独立实体）什么版本的SQL Server？2016引入了对JSON的支持，这可能有助于在查询中正确格式化您的输出。通过示例数据，提供实际需要的JSON。我可能有一些需要改进的地方help@alroc我们有SQL server2014@JohnCappelletti我更新了我的answer@ArnaldoAntonioTorres见刚才补充的答案
CREATE FUNCTION [dbo].[udf-Str-JSON] (@IncludeHead int,@ToLowerCase int,@XML xml)
Returns varchar(max)
AS
Begin
    Declare @Head varchar(max) = '',@JSON varchar(max) = ''
    ; with cteEAV as (Select RowNr     =Row_Number() over (Order By (Select NULL))
                            ,Entity    = xRow.value('@*[1]','varchar(100)')
                            ,Attribute = xAtt.value('local-name(.)','varchar(100)')
                            ,Value     = xAtt.value('.','varchar(max)') 
                       From  @XML.nodes('/row') As R(xRow) 
                       Cross Apply R.xRow.nodes('./@*') As A(xAtt) )
          ,cteSum as (Select Records=count(Distinct Entity)
                            ,Head = IIF(@IncludeHead=0,IIF(count(Distinct Entity)<=1,'[getResults]','[[getResults]]'),Concat('{"status":{"successful":"true","timestamp":"',Format(GetUTCDate(),'yyyy-MM-dd hh:mm:ss '),'GMT','","rows":"',count(Distinct Entity),'"},"retults":[[getResults]]}') ) 
                       From  cteEAV)
          ,cteBld as (Select *
                            ,NewRow=IIF(Lag(Entity,1)  over (Partition By Entity Order By (Select NULL))=Entity,'',',{')
                            ,EndRow=IIF(Lead(Entity,1) over (Partition By Entity Order By (Select NULL))=Entity,',','}')
                            ,JSON=Concat('"',IIF(@ToLowerCase=1,Lower(Attribute),Attribute),'":','"',Value,'"') 
                       From  cteEAV )
    Select @JSON = @JSON+NewRow+JSON+EndRow,@Head = Head From cteBld, cteSum
    Return Replace(@Head,'[getResults]',Stuff(@JSON,1,1,''))
End
-- Parameter 1: @IncludeHead 1/0
-- Parameter 2: @ToLowerCase 1/0 (converts field name to lowercase
-- Parameter 3: (Select * From ... for XML RAW)