How to convert this query to linq

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Hi Please let me know how can I convert this query to linq, actually I need create dynamic pivot table from sql server I was done with this query but I can not save this query in my sql server same as view or function or etc. so I want to use linq veersion of this query from my Entity mode.

SQL

DECLARE @ColumnsTable TABLE ([ColumnName] VARCHAR(50));
 
INSERT INTO @ColumnsTable ([ColumnName])
SELECT DISTINCT '[' + CONVERT(nvarchar(50), Unit) + ']'
FROM   dbo.MeterValueView;
 
DECLARE @PivotColumns VARCHAR(MAX), @TotalColumn VARCHAR(MAX), @SQL VARCHAR(MAX);
 
SET @PivotColumns = (SELECT STUFF((SELECT DISTINCT ', ' + CONVERT(nvarchar(50), [ColumnName])
                                   FROM   @ColumnsTable
                                   FOR XML PATH('')), 1, 2, ''));
SET @TotalColumn = (SELECT STUFF((SELECT DISTINCT ' + ISNULL(' + CONVERT(nvarchar(50), [ColumnName]) + ', 0)'
                                  FROM   @ColumnsTable
                                  FOR XML PATH('')), 1, 3, ''));
SET @SQL = 'SELECT *, (' + @TotalColumn + ') AS [Total]
FROM   (SELECT [Serial],
               [Unit],
               [Value]
        FROM   [MeterValueView]) AS t
       PIVOT (MAX([Value])
             FOR [Unit] IN (' + @PivotColumns + ')) AS p;';
 
EXEC(@SQL)

Posted 4-Nov-14 7:51am

Aydin Homay

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2 solutions

Solution 1

You can try to use Linqer[^]. It's a conversion tool from SQL to Linq.

http://www.sqltolinq.com/[^]

Posted 4-Nov-14 8:41am

Manas Bhardwaj

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Aydin Homay 4-Nov-14 14:43pm

It can not support some functions same as EXEC(@SQL) and etc.

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Aydin Homay · Accepted Answer · 2014-11-04T08:44:00

I find out a really simple way for doing this requirement, so I saved my Dynamic Query into store procedure:

SQL

CREATE PROC MeterValuesView 

AS
BEGIN

DECLARE @ColumnsTable TABLE ([ColumnName] VARCHAR(50));
 
INSERT INTO @ColumnsTable ([ColumnName])
SELECT DISTINCT '[' + CONVERT(nvarchar(50), Unit) + ']'
FROM   dbo.MeterValueView;
 
DECLARE @PivotColumns VARCHAR(MAX), @TotalColumn VARCHAR(MAX), @SQL VARCHAR(MAX);
 
SET @PivotColumns = (SELECT STUFF((SELECT DISTINCT ', ' + CONVERT(nvarchar(50), [ColumnName])
                                   FROM   @ColumnsTable
                                   FOR XML PATH('')), 1, 2, ''));
SET @TotalColumn = (SELECT STUFF((SELECT DISTINCT ' + ISNULL(' + CONVERT(nvarchar(50), [ColumnName]) + ', 0)'
                                  FROM   @ColumnsTable
                                  FOR XML PATH('')), 1, 3, ''));
SET @SQL = 'SELECT *, (' + @TotalColumn + ') AS [Total]
FROM   (SELECT [Serial],
               [Unit],
               [Value]
        FROM   [MeterValueView]) AS t
       PIVOT (MAX([Value])
             FOR [Unit] IN (' + @PivotColumns + ')) AS p;';
 
EXEC(@SQL)

END