CODE - TSQL convert Query to JSON

原文 ODE - TSQL convert Query to JSON

TSQL - Query to JSON

It is my philosophy that good development starts with the data. I have always stressed whenever possible allow your data processing to take place on your SQL server or database processing engine and rendering of the data to the application control engine. By the time your application server receives the data it should be in the truncated, filtered, limited by rows, converted to correct formats, free of whitespace ect. Your application should only receive what it will use on the screen and nothing more. This however requires a developer to actually develop code, Stored Procedures and Functions.

This follows the same logical philosophy and creates a simple Query to JSON procedure.

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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, @[email protected] 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 @[email protected]+Len(@StartRoot)

    SET @RowEnd=CharIndex(@EndRoot,@XMLString,@RowStart)

    SET @Row=SubString(@XMLString,@RowStart,@[email protected])

    SET @[email protected]+‘{‘

 

    -- for each row

    SET @FieldStart=CharIndex(@StartField,@Row,0)

    WHILE @FieldStart>0

    BEGIN

        -- parse node key

        SET @[email protected]+Len(@StartField)

        SET @FieldEnd=CharIndex(@EndField,@Row,@FieldStart)

        SET @KEY=SubString(@Row,@FieldStart,@[email protected])

        SET @[email protected]+‘"‘[email protected]+‘":‘

        -- parse node value

        SET @[email protected]+1

        SET @FieldEnd=CharIndex(‘</‘,@Row,@FieldStart)

        SET @Value=SubString(@Row,@FieldStart,@[email protected])

        SET @[email protected]+‘"‘[email protected]+‘",‘

 

        SET @[email protected]+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 @[email protected]+‘},‘

    --/ for each row

 

    SET @RowStart=CharIndex(@StartRoot,@XMLString,@RowEnd)

END

IF LEN(@JSON)>0SET @JSON=SubString(@JSON,0,LEN(@JSON))

SET @JSON=‘[‘[email protected]+‘]‘

SELECT @JSON

 

END

GO

Call thestored procedure

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1

EXEC[SerializeJSON]‘SELECT*FROM[Employee_TBL]‘
时间： 2024-10-31 16:04:44

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