Calling Stored Procedure With Return Value

How to call a stored procedure and return a value?

You say @alphaVar is varchar(10). In that case you need to use an output parameter as below. Return can only be used for integer types in stored procedures.

CREATE PROCEDURE rnd_STR
@Length int,
@alphaVar varchar(10) OUTPUT    
AS
BEGIN
SET @alphaVar = 'blah'
/* Rest of procedure body*/
END

GO

DECLARE @alphaVar varchar(10) 

EXEC rnd_STR 10, @alphaVar output

SELECT @alphaVar

Alternatively you could use a scalar UDF rather than a stored procedure.

Calling stored procedure with return value

You need to add a ReturnValue-direction parameter to the command:

using (SqlConnection conn = new SqlConnection(getConnectionString()))
using (SqlCommand cmd = conn.CreateCommand())
{
    cmd.CommandText = parameterStatement.getQuery();
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("SeqName", "SeqNameValue");

    // @ReturnVal could be any name
    var returnParameter = cmd.Parameters.Add("@ReturnVal", SqlDbType.Int);
    returnParameter.Direction = ParameterDirection.ReturnValue;

    conn.Open();
    cmd.ExecuteNonQuery();
    var result = returnParameter.Value;
}

Setting the parameter's direction to ParameterDirection.ReturnValue instructs the SqlCommand to declare it as a variable and assign the stored procedure's return value to it (exec @ReturnValue = spMyProcedure...), exactly like you would write it in SQL.

Return value from one stored procedure to another

Add

@Status int OUTPUT

in the pro_ForeignKeyCheck so it starts with

CREATE PROCEDURE dbo.pro_ForeignKeyCheck1
@tableName VARCHAR(100),
@columnName VARCHAR(100),
@idValue int,
@Status int OUTPUT

and at the end of it did as follow

--select coalesce(@fkFound,0)
select @Status = coalesce(@fkFound,0)
--return 0

stop the last to line and add new one

In the other stored procedure, call it as follows

EXEC  pro_ForeignKeyCheck1 'tb_M_admin','admin_id', 0 ,@exit output 
select @exit

and now the return value will be used.

Thanks to all

Getting return value from stored procedure - C#

Expanding on what Andrei has said you should really use an OUTPUT parameter to see the number of rows affected, return value is only used to see the success/failure of the operation:

A stored procedure with an output parameter would look something like....

ALTER proc [Core].[up_ExternalTradeInsert]
@ExecID char(16),
@SecondaryExecID char(16),
@SecurityID int,
@SecurityIDSource int,
@LastQty int,
@LastPx decimal(12, 6),
@TransactTime datetime2(3),
@Side bit, --0 Sell 1-Buy
@OrderID char(16),
@ClOrdID char(20),
@Account int,
@SenderId int,
@RowCount INT OUTPUT
as
begin
set nocount on

insert Core.ExternalTrade(ExecID, SecondaryExecID, SecurityID, SecurityIDSource, LastQty, LastPx, TransactTime, Side, OrderID, ClOrdID, Account)
values (@ExecID, @SecondaryExecID, @SecurityID, @SecurityIDSource, @LastQty, @LastPx, @TransactTime, @Side, @OrderID, @ClOrdID, @Account)

  SET @RowCount =  @@rowcount;
end

And you C# code would look something like.....

using (SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["Connection"]))
{
    conn.Open();
    SqlCommand cmd = new SqlCommand("Core.up_ExternalTradeInsert", conn);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.Add("@RowCount", SqlDbType.Int).Direction = ParameterDirection.Output;
    cmd.Parameters.Add(new SqlParameter("@ExecID", execID));
    cmd.Parameters.Add(new SqlParameter("@SecondaryExecID", secondaryExecID));
    cmd.Parameters.Add(new SqlParameter("@SecurityID", securityID));
    cmd.Parameters.Add(new SqlParameter("@SecurityIDSource", securityIDSource));
    cmd.Parameters.Add(new SqlParameter("@LastQty", lastQty));
    cmd.Parameters.Add(new SqlParameter("@LastPx", lastPx));
    cmd.Parameters.Add(new SqlParameter("@TransactTime", transactTime));
    cmd.Parameters.Add(new SqlParameter("@Side", side));
    cmd.Parameters.Add(new SqlParameter("@OrderID", orderID));
    cmd.Parameters.Add(new SqlParameter("@ClOrdID", clOrdID));
    cmd.Parameters.Add(new SqlParameter("@Account", account));
    cmd.Parameters.Add(new SqlParameter("@SenderId", senderId));

    cmd.ExecuteNonQuery();//.ExecuteNonQuery();
    int RowsAffected = Convert.ToInt32(cmd.Parameters["@RowCount"].Value);
}

Getting the return value from stored procedure and using it in program

The SQL is more complicated than it needs to be - you could use

CREATE Procedure Check_Previous_Passwords
    @ua_pk uniqueidentifier,
    @IncomingPassword varchar(25)
AS
    SELECT COUNT(*)
    FROM User_Passwords up 
    WHERE up.ua_fk = @ua_pk
        AND @IncomingPassword = up.up_Password

and the VB which uses it needs to be a function so that it can return a value:

Option Strict On
' ...'
Public Function Check_Previous_Passwords(ByVal User As FoundationLibrary.User) As Boolean
    Dim isSamePassword As Integer
    Dim objCommand As New SqlCommand("Check_Previous_Passwords", DatabaseInterface_.Connection)
    objCommand.CommandType = CommandType.StoredProcedure
    objCommand.Parameters.Add(New SqlParameter With {.ParameterName"@ua_pk", .SqlDbType = SqlDbType.UniqueIdentifier, .Value = ua_pk_})
    objCommand.Parameters.Add(New SqlParameter With {.ParameterName = "@IncomingPassword", .SqlDbType = SqlDbType.VarChar, .Size = 25, .Value = ua_Password_})
    DatabaseInterface_.Open()
    isSamePassword = CInt(objCommand.ExecuteScalar)
    DatabaseInterface_.Close()

    User.ua_ResetPassword_ = (isSamePassword = 1)

    Return User.ua_ResetPassword_

End Function

I changed the AddWithValue parts to a version which works reliably. You should avoid AddWithValue - it will only bring you misery eventually: Can we stop using AddWithValue() already?

Get return value from stored procedure

I found it!
I can read the return value with an output parameter that has to be used in this way:

// define a new output parameter
var returnCode = new SqlParameter();
returnCode.ParameterName = "@ReturnCode";
returnCode.SqlDbType = SqlDbType.Int;
returnCode.Direction = ParameterDirection.Output;

// assign the return code to the new output parameter and pass it to the sp
var data = _context.Database.SqlQuery<Item>("exec @ReturnCode = spItemData @Code, @StatusLog OUT", returnCode, code, outParam);

Is return value from a stored procedure must be declared as out parameter?

You can construct and call different types of stored procedures:

1) A stored procedure that returns no result. For example, such a stored procedure can log non-critical information, or change database data in a straightforward way.

Example : A stored procedure which performs insert operation.

2) A stored procedure that returns one or more values using output parameters. For example, such a procedure can indicate success or failure, or retrieve and return data items.

Example : A stored procedure which performs "Select particular_field
FROM table ..." query.

3) A stored procedure that returns one or more result sets. The procedure can execute one or more queries, each of which returns an arbitrary number of rows. Your application loops through each result set to display, transform, or otherwise process each row in it.

Example : A stored procedure which performs multiple select queries.

Hope it might help.

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