If else in stored procedure sql server

Question

I have created a stored procedure as follow:

Create Procedure sp_ADD_USER_EXTRANET_CLIENT_INDEX_PHY
(
@ParLngId int output
)
as
Begin
    SET @ParLngId = (Select         


        

Answer 1

Try this one -

CREATE PROCEDURE sp_ADD_USER_EXTRANET_CLIENT_INDEX_PHY
AS
BEGIN

    DECLARE @ParLngId INT
    SELECT TOP 1 @ParLngId = ParLngId
    FROM dbo.T_Param
    WHERE ParStrNom = 'Extranet Client'

    IF (@ParLngId = 0)
    BEGIN
        INSERT INTO dbo.T_Param
        VALUES ('PHY', 'Extranet Client', NULL, NULL, 'T', 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 1, NULL, NULL, NULL)

        RETURN SCOPE_IDENTITY()
    END
    ELSE BEGIN

        RETURN @ParLngId 

    END

END

Answer 2

Thank you all for your answers but I figured out how to do it and the final procedure looks like that :

Create Procedure sp_ADD_RESPONSABLE_EXTRANET_CLIENT
(
@ParLngId int output
)
as
Begin
if not exists (Select ParLngId from T_Param where ParStrIndex = 'RES' and ParStrP2 = 'Web')
    Begin
            INSERT INTO T_Param values('RES','¤ExtranetClient', 'ECli', 'Web', 1, 1, Null, Null, 'non', 'ExtranetClient', 'ExtranetClient', 25032, Null, 'informatique.interne@company.fr', 'Extranet-Client', Null, 27, Null, Null, Null, Null, Null, Null, Null, Null, 1, Null, Null, 0 )
            SET @ParLngId = @@IDENTITY
    End
Else
    Begin
            SET @ParLngId = (Select top 1 ParLngId from T_Param where ParStrNom = 'Extranet Client')
            Return @ParLngId
    End   
End

So the thing that I found out and which made it works is:

if not exists

It allows us to use a boolean instead of Null or 0 or a number resulted of count()