ExecuteSqlCommand with output parameter - asp.net-mvc

Question

I'm using Entity Framework in an ASP.NET MVC3 application and I'm trying to use the following code:
var token = "";
this.Database.ExecuteSqlCommand("exec dbo.MyUsp", new SqlParameter("token", token));
My stored proc signature is:
CREATE PROCEDURE MyUSP(#token varchar(10) OUT)
(...)
When I use this code I get an error saying that parameter "#token" was expected but not supplied.
How do I tell EF that the token parameter is for output?

Answer 1

I ended up using this to get it working, but I'm sure there's a more optimal way:
var p = new SqlParameter
{
ParameterName = "token",
DbType = System.Data.DbType.String,
Size = 100,
Direction = System.Data.ParameterDirection.Output
};
var resp = this.Database.SqlQuery<String>("exec dbo.usp_GetRequestToken #token", p);
return resp.First();

Answer 2

var outParam = new SqlParameter();
outParam.ParameterName = "OutPutParametname";
outParam.SqlDbType = SqlDbType.Bit;//DataType Of OutPut Parameter
outParam.Direction = ParameterDirection.Output;
db.Database.ExecuteSqlCommand("EXEC ProcedureName #Param1,#Param2 OUTPUT", new SqlParameter("Param1", value), outParam);
object outParamValue = Convert.ToBoolean(outParam.Value);

Answer 3

You need to indicate the direction in the parameter. For example, try something like this:
var p = new SqlParameter("token", token);
p.Direction = ParameterDirection.InputOutput;
this.Database.ExecuteSqlCommand("exec dbo.MyUsp", p);

Answer 4

I solved this issue with following SQL and Entity Framework code
SP :
ALTER PROCEDURE [dbo].[SaveSingleColumnValueFromGrid]
(
#TableName VARCHAR(200),
#ColumnName VARCHAR (200),
#CompareField VARCHAR(200),
#CompareValue VARCHAR(200),
#NewValue VARCHAR(200),
#Result INT OUTPUT
)
AS
BEGIN
DECLARE #SqlString NVARCHAR(2000),
#id INTEGER = 0;
IF #CompareValue = ''
BEGIN
SET #SqlString = 'INSERT INTO ' + #TableName + ' ( ' + #ColumnName + ' ) VALUES ( ''' + #NewValue + ''' ) ; SELECT #id = SCOPE_IDENTITY()';
EXECUTE sp_executesql #SqlString, N'#id INTEGER OUTPUT', #id OUTPUT
END
ELSE
BEGIN
SET #SqlString = 'UPDATE ' + #TableName + ' SET ' + #ColumnName + ' = ''' + #NewValue + ''' WHERE ' + #CompareField + ' = ''' + #CompareValue + '''';
EXECUTE sp_executesql #SqlString
set #id = ##ROWCOUNT
END
SELECT #Result = #id
END
Entity Framework Code :
public FieldUpdateResult SaveSingleColumnValueFromGrid(string tableName, string tableSetFieldName, string updatedValue, string tableCompareFieldName, string uniqueFieldValue)
{
var fieldUpdateResult = new FieldUpdateResult() ;
var isNewRecord = false;
if (string.IsNullOrWhiteSpace(uniqueFieldValue))
{
uniqueFieldValue = string.Empty;
isNewRecord = true;
}
using (var dbContext = new DBEntities())
{
var resultParameter = new SqlParameter("#Result", SqlDbType.Int)
{
Direction = ParameterDirection.Output
};
var recordsAffected = dbContext.Database.ExecuteSqlCommand("SaveSingleColumnValueFromGrid #TableName,#ColumnName,#CompareField,#CompareValue,#NewValue,#Result out",
new SqlParameter("#TableName", tableName),
new SqlParameter("#ColumnName", tableSetFieldName),
new SqlParameter("#CompareField", tableCompareFieldName),
new SqlParameter("#CompareValue", uniqueFieldValue),
new SqlParameter("#NewValue", updatedValue),
resultParameter);
fieldUpdateResult.Success = recordsAffected > 0;
if (isNewRecord)
{
fieldUpdateResult.NewId = (int)resultParameter.Value;
}
else
{
fieldUpdateResult.AffectedRows = (int)resultParameter.Value;
}
}
return fieldUpdateResult;
}

Answer 5

var db = new DBContext();
var outParam = new SqlParameter
{
ParameterName = "#Param",
DbType = System.Data.DbType.String,
Size = 20,
Direction = System.Data.ParameterDirection.Output
};
var r = db.Database.ExecuteSqlCommand("EXEC MyStoredProd #Param OUT",outParam );
Console.WriteLine(outParam.Value);
The main part i see everyone is missing, is the OUT keyword needed after #Param.

Answer 6

Below is what I do for Oracle using the DevArt driver. I have a package.proc called P_SID.SID_PGet that returns a single string value. The proc is:
PROCEDURE SID_PGet(io_SID OUT varchar2) is
Begin
io_SID:=GetSID; -- GetSID just goes off and gets the actual value
End;
Below is how I call it and retrieve the SID value (I'm using this with EF 4.1 code first and this method is in the DbContext):
/// <summary>
/// Get the next SID value from the database
/// </summary>
/// <returns>String in X12345 format</returns>
public string GetNextSId()
{
var parameter = new Devart.Data.Oracle.OracleParameter("io_SID", Devart.Data.Oracle.OracleDbType.VarChar, ParameterDirection.Output);
this.Database.ExecuteSqlCommand("BEGIN P_SID.SID_PGet(:io_SID); END;", parameter);
var sid = parameter.Value as string;
return sid;
}