sqlserver 之 将查询结果变为json字符串

GO
/****** Object:  StoredProcedure [dbo].[SerializeJSON]    Script Date: 6/4/2019 3:58:23 PM
    将查询结果变为json字符串
 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[SerializeJSON] (
   @ParameterSQL NVARCHAR(MAX)
  )
AS
BEGIN
DECLARE @SQL NVARCHAR(MAX)
DECLARE @XMLString VARCHAR(MAX)
DECLARE @XML XML
DECLARE @Paramlist NVARCHAR()
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_xml NVARCHAR(MAX);
  BEGIN TRY--//开始捕捉异常
    DECLARE @JSON NVARCHAR(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();
    SET @StartRoot = '<row>';
    DECLARE @EndRoot VARCHAR();
    SET @EndRoot = '</row>';
    DECLARE @StartField VARCHAR();
    SET @StartField = '<';
    DECLARE @EndField VARCHAR();
    SET @EndField = '>';
    SET @RowStart = CHARINDEX(@StartRoot, @XMLString, );
    SET @JSON = '';
    WHILE @RowStart>
    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, );
      WHILE @FieldStart>
      BEGIN
        --//parse node key
        SET @FieldStart = @FieldStart + LEN(@StartField);
        SET @FieldEnd = CHARINDEX(@EndField, @Row, @FieldStart);
        DECLARE @end INT = CHARINDEX('/>', @Row, @FieldStart);
        IF @end<
          OR @end>@FieldEnd
        BEGIN
          SET @KEY = SUBSTRING(@Row, @FieldStart, @FieldEnd - @FieldStart);
          SET @JSON = @JSON + '"' + @KEY + '":';
          --//parse node value
          SET @FieldStart = @FieldEnd + ;
          SET @FieldEnd = CHARINDEX('</', @Row, @FieldStart);
          SET @Value = SUBSTRING(@Row, @FieldStart, @FieldEnd - @FieldStart);
          SET @JSON = @JSON + '"' + @Value + '",';
        END;
        SET @FieldStart = @FieldStart + LEN(@StartField);
        SET @FieldEnd = CHARINDEX(@EndField, @Row, @FieldStart);
        SET @FieldStart = CHARINDEX(@StartField, @Row, @FieldEnd);
      END;
      IF LEN(@JSON)>
        SET @JSON = SUBSTRING(@JSON, , LEN(@JSON));
      SET @JSON = @JSON + '},';
      --// for each row
      SET @RowStart = CHARINDEX(@StartRoot, @XMLString, @RowEnd);
    END;
    IF LEN(@JSON)>
      SET @JSON = SUBSTRING(@JSON, , LEN(@JSON));
      SET @JSON = '[' + @JSON + ']';
    SET @json_xml = @JSON;
  END TRY--//结束捕捉异常
  BEGIN CATCH--//有异常被捕获
    SET @json_xml = @XMLString;
  END CATCH;--//结束异常处理
  select @json_xml as result_json;
END;

USE [EMRWS]GO/****** Object:  StoredProcedure [dbo].[SerializeJSON]    Script Date: 6/4/2019 3:58:23 PM将查询结果变为json字符串 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOALTER PROCEDURE [dbo].[SerializeJSON] (   @ParameterSQL NVARCHAR(MAX)  )ASBEGINDECLARE @SQL NVARCHAR(MAX)DECLARE @XMLString VARCHAR(MAX)DECLARE @XML XMLDECLARE @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 OUTPUTSET @XMLString=CAST(@XML AS VARCHAR(MAX))
  DECLARE @json_xml NVARCHAR(MAX);  BEGIN TRY--//开始捕捉异常    DECLARE @JSON NVARCHAR(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);        DECLARE @end INT = CHARINDEX('/>', @Row, @FieldStart);        IF @end<1          OR @end>@FieldEnd        BEGIN          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 + '",';        END;        SET @FieldStart = @FieldStart + LEN(@StartField);        SET @FieldEnd = CHARINDEX(@EndField, @Row, @FieldStart);        SET @FieldStart = CHARINDEX(@StartField, @Row, @FieldEnd);      END;      IF LEN(@JSON)>0        SET @JSON = SUBSTRING(@JSON, 0, LEN(@JSON));      SET @JSON = @JSON + '},';      --// for each row      SET @RowStart = CHARINDEX(@StartRoot, @XMLString, @RowEnd);    END;    IF LEN(@JSON)>0      SET @JSON = SUBSTRING(@JSON, 0, LEN(@JSON));  SET @JSON = '[' + @JSON + ']';    SET @json_xml = @JSON;  END TRY--//结束捕捉异常  BEGIN CATCH--//有异常被捕获    SET @json_xml = @XMLString;  END CATCH;--//结束异常处理  select @json_xml as result_json;END;