Question

I’m pivoting data in MS SQL stored procedure. Columns which are pivoted are dynamically created using stored procedure parameter (for exampe: ‘location1,location2,location3,’) so number of columns which will be generated is not known. Output should look like (where locations are taken from stored procedure parameter):

OrderTime | Location1 | Location2 | Location3

Any chance that this can be used in LINQ to SQL? When I dragged this procedure to dbml file it shows that this procedure returns int type.

Columns I use from log_sales table are:

• Location (various location which I’m pivoting),
• Charge (amount of money)
• OrderTime

Stored procedure:

CREATE PROCEDURE [dbo].[proc_StatsDay] @columns NVARCHAR(64) AS  DECLARE @SQL_PVT1 NVARCHAR(512), @SQL_PVT2 NVARCHAR(512), @SQL_FULL NVARCHAR(4000);  SET @SQL_PVT1 =  'SELECT OrderTime, ' + LEFT(@columns,LEN(@columns)-1) +' FROM (SELECT ES.Location, CONVERT(varchar(10), ES.OrderTime, 120),ES.Charge         FROM dbo.log_sales ES         ) AS D (Location,OrderTime,Charge)         PIVOT (SUM (D.Charge) FOR D.Location IN             ('; SET @SQL_PVT2 = ') )AS PVT ORDER BY OrderTime DESC';  SET @SQL_FULL = @SQL_PVT1 + LEFT(@columns,LEN(@columns)-1) +  @SQL_PVT2;         EXEC sp_executesql @SQL_FULL, N'@columns NVARCHAR(64)',@columns = @columns 

In dbml designer.cs file my stored procedure part of code:

[Function(Name='dbo.proc_StatsDay')] public int proc_EasyDay([Parameter(DbType='NVarChar(64)')] string columns) {     IExecuteResult result = this.ExecuteMethodCall(this,((MethodInfo)MethodInfo.GetCurrentMethod())), columns);     return ((int)(result.ReturnValue)); } 

Answer 1

Assuming truly dire dynamic need, you could use DataContext.ExecuteQuery

Just whip up a type that will cover the result space (the property names must match the column names in the query):

public class DynamicResult {   public DateTime OrderDate {get;set;}   public decimal? Location1 {get;set;}   public decimal? Location2 {get;set;} //..   public decimal? Location100 {get;set;} } 

Then call

IEnumerable<DynamicResult> result =   myDataContext.ExecuteQuery<DynamicResult>(commandString, param1);