SQL Server 结果转JSON存储过程

Posted 2022-07-18 wx62d1485ecb778

SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 CREATE PROCEDURE[dbo].[SerializeJSON](
 @ParameterSQL AS VARCHAR(MAX)
 )
 AS
 BEGIN
  
 DECLARE @SQL NVARCHAR(MAX)
 DECLARE @XMLString VARCHAR(MAX)
 DECLARE @XML XML
 DECLARE @Paramlist NVARCHAR(1000)
 SET @Paramlist = N@XML XML OUTPUT
 SET @SQL = WITH PrepareTable (XMLString)
 SET @SQL = @SQL + AS(
 SET @SQL = @SQL + @ParameterSQL+ FOR XML RAW,TYPE,ELEMENTS
 SET @SQL = @SQL + )
 SET @SQL = @SQL + SELECT @XML=[XMLString]FROM[PrepareTable]
 EXEC sp_executesql @SQL, @Paramlist, @XML=@XML OUTPUT
 SET @XMLString=CAST(@XML AS VARCHAR(MAX))
  
 DECLARE @JSON VARCHAR(MAX)
 DECLARE @Row VARCHAR(MAX)
 DECLARE @RowStart INT
 DECLARE @RowEnd INT
 DECLARE @FieldStart INT
 DECLARE @FieldEnd INT
 DECLARE @KEY VARCHAR(MAX)
 DECLARE @Value VARCHAR(MAX)
  
 DECLARE @StartRoot VARCHAR(100);SET @StartRoot=<row>
 DECLARE @EndRoot VARCHAR(100);SET @EndRoot=</row>
 DECLARE @StartField VARCHAR(100);SET @StartField=<
 DECLARE @EndField VARCHAR(100);SET @EndField=>
  
 SET @RowStart=CharIndex(@StartRoot,@XMLString,0)
 SET @JSON=
 WHILE @RowStart>0
 BEGIN
     SET @RowStart=@RowStart+Len(@StartRoot)
     SET @RowEnd=CharIndex(@EndRoot,@XMLString,@RowStart)
     SET @Row=SubString(@XMLString,@RowStart,@RowEnd-@RowStart)
     SET @JSON=@JSON+
  
     -- for each row
     SET @FieldStart=CharIndex(@StartField,@Row,0)
     WHILE @FieldStart>0
     BEGIN
         -- parse node key
         SET @FieldStart=@FieldStart+Len(@StartField)
         SET @FieldEnd=CharIndex(@EndField,@Row,@FieldStart)
         SET @KEY=SubString(@Row,@FieldStart,@FieldEnd-@FieldStart)
         SET @JSON=@JSON+"+@KEY+":
         -- parse node value
         SET @FieldStart=@FieldEnd+1
         SET @FieldEnd=CharIndex(</,@Row,@FieldStart)
         SET @Value=SubString(@Row,@FieldStart,@FieldEnd-@FieldStart)
         SET @JSON=@JSON+"+@Value+",
  
         SET @FieldStart=@FieldStart+Len(@StartField)
         SET @FieldEnd=CharIndex(@EndField,@Row,@FieldStart)
         SET @FieldStart=CharIndex(@StartField,@Row,@FieldEnd)
     END   
     IF LEN(@JSON)>0SET @JSON=SubString(@JSON,0,LEN(@JSON))
     SET @JSON=@JSON+,
     --/ for each row
  
     SET @RowStart=CharIndex(@StartRoot,@XMLString,@RowEnd)
 END
 IF LEN(@JSON)>0SET @JSON=SubString(@JSON,0,LEN(@JSON))
 SET @JSON=[+@JSON+]
 SELECT @JSON
  
 --使用: EXEC [SerializeJSON] SELECT * FROM [xxx]
 END
 GO