sql server 分页生成json字符串

USE [test]
GO
/****** Object: StoredProcedure [dbo].[proc_paged_with_Midvar] Script Date: 12/17/2015 09:14:55 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[proc_paged_with_Midvar] --利用ID>最大ID值和中间变量

(

@pageIndex int,

@pageSize int
)

as

declare @count int

declare @ID int

declare @timediff datetime

declare @ParameterSQL nvarchar(500)
declare @testTable nvarchar(500)

begin

set nocount on;

select @count=0,@ID=0,@timediff=getdate()

select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then testID else @ID end from testTable order by testId

set @ParameterSQL='select top '+str(@pageSize)+' * from testTable where testID>'+str(@ID)
--return @sql
--print @sql
--execute(@sql)
--select @sql
--select datediff(ms,@timediff,getdate()) as 耗时

set nocount off;

end
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
end
/**
使用说明：
使用事例：exec [proc_paged_with_Midvar] 1,1
可能需要修改一下存储过程进行表的适配
**/

总体上来说是使用 动态构造sql语句 和 SerializeJSON 存储过程 结合了一下，用以备忘