Question

I want to create a procedure that inserts into a table and returns it’s primary key.
The primary key of table is uniqueidentyfire and it’s guid is true

This is the stored procedure:

ALTER PROCEDURE [dbo].[pr_Tbl_Erae_Insert]
    @sfk_Dars varchar(20),
    @sfk_Ostad varchar(20),
    @byfk_Gerayesh tinyint,
    @ifk_term int,
    @guidErae_ID uniqueidentifier,
    @byGroup_Number tinyint,

AS
-- INSERT a new row in the table.
INSERT [dbo].[Tbl_Erae]
(
    [fk_Dars],
    [fk_Ostad],
    [fk_Gerayesh],
    [fk_term],
    [Erae_ID],
    [Group_Number]
)
VALUES
(
    @sfk_Dars,
    @sfk_Ostad,
    @byfk_Gerayesh,
    @ifk_term,
    ISNULL(@guidErae_ID, (newid())),
    @byGroup_Number
)

I need to return Erae_Id when it inserted into table how can I do that?

Can I use from output variables? How?

Answer 1

There is an OUTPUT clause available, depending on your version; however, in this case it is probably easier (since you only have one row) to handle this separately:

IF @guidErae_ID IS NULL SET @guidErae_ID = NEWID()

then use @guidErae_ID “as is” in the INSERT (no ISNULL), and then either end with:

SELECT @guidErae_ID

and use var result = (Guid)command.ExecuteScalar(), or mark @guidErae_ID as OUTPUT in the parameter definition, and query it after calling command.ExecuteNonQuery().