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8.5

JSON output from MS SQL Procedure

Asked by benners70 in MySQL Server, JSON

Tags: JSON, MS SQL

I'm trying to output JSON format from a MS SQL procedure. The SP attached works fine as long as the @XMLString does not exceed  VARCHAR(MAX)), but gives an error if this is exceeded. How can I modify the attached to work with a larger number of records? 
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set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[sp_JSON]  (
@ParameterSQL AS VARCHAR(MAX)
)
AS
BEGIN
	SET NOCOUNT ON;
 
	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)>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 + ']'
	SELECT @JSON
END
[+][-]08/16/09 08:11 AM, ID: 25109223Accepted Solution

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About this solution

Zones: MySQL Server, JSON
Tags: JSON, MS SQL
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Solution Provided By: accountofme
Participating Experts: 1
Solution Grade: A
 
[+][-]09/01/09 02:12 AM, ID: 25229660Author Comment

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