SqlServer将查询结果转换为XML和JSON

很久之前用到的，现在整理在这，里面一些代码来源于网上，不过有些bug已被我修改了。

1.查询结果转XML

DECLARE @ParameterSQL NVARCHAR(MAX)='SELECT * FROM table';DECLARE @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))SELECT @XML;SELECT @XMLString;

2.查询结果转JSON

查询结果转换成json需要经过两个步骤，首先将查询结果转成XML数据，然后通过XML数据转成json

XML转JSON的存储过程如下：

CREATE PROCEDURE [dbo].[SerializeJSON] (   @XML XML,   @json_xml NVARCHAR(MAX) OUTPUT  )ASBEGIN  DECLARE @XMLString NVARCHAR(MAX);  SET @XMLString = CAST(@XML AS 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END;

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