SQL Server stored procedure transfer an attribute - sql

Question

I'm working on some example questions in Microsoft SQL Server Management Studio. I am very lost on this question, if anyone could explain how to go about transferring an attribute like that I would appreciate it. I'll attach the tables of a simple database that I'm testing with.
Create a stored procedure that accepts an AreaID and a handlerID. The procedure will transfer an area from one Handler to another.
When the area is transferred the new Handler will have $25.00 added their Salary and the old Handler will have $25.00 subtracted from their Salary.
Remember to update all tables as needed as well as include a transaction and error catching
Code:
Create Table Runner
(
RunnerID int identity (1,1) not null
Constraint PK_Runner primary key clustered,
RunnerFirstName varchar(30) not null,
RunnerLastName varchar(30) not null,
Phone char(10) not null
Constraint ck_Phone check (Phone like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]')
)
Create Table DevSite
(
DevSiteId int not null
Constraint PK_DevSite primary key clustered,
DevSiteName varchar(50) not null,
DevSiteAddress varchar(60) not null
)
Create Table Handler
(
handlerID int identity (1,1) not null
Constraint PK_Handler primary key clustered,
HandlerFirstName varchar(30) not null,
HandlerLastName varchar(30) not null,
PagerNumber char(10) not null
Constraint ck_pager check (PagerNumber like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'),
Salary smallmoney not null Constraint CK_Salary check(Salary >= 0) Constraint df_Salary default 12.00
)
Create Table Area
(
AreaID int not null
Constraint PK_Area primary key clustered,
AreaName varchar(50) not null,
AreaSupeFirstName varchar(30) not null,
AreaSupeLastName varchar(30) not null,
handlerID int not null constraint fk_AreaToHandler references Handler(handlerID)
)
Create Table Direction
(
DirectionID int not null Constraint PK_Direction primary key clustered,
DirectionName varchar(50) not null,
EstimatedTime varchar(3) not null,
AreaID int not null Constraint FK_RouteToArea references Area (AreaID),
DevSiteID int not null Constraint FK_RouteToDevSite references DevSite (DevSiteID),
RunnerId int not null Constraint FK_RouteToRunner references Runner (RunnerId)
)
Create Table Consumer
(
ConsumerID int not null Constraint PK_Consumer primary key clustered,
ConsumerFirstName varchar(30) not null,
ConsumerLastName varchar(30) not null,
Address varchar(50) not null,
City varchar(30) not null,
Province char(2) not null Constraint ck_province check (Province Like '[A-Z][A-Z]') Constraint DF_Province Default 'AB',
PC char(7) not null Constraint CK_PostalCode Check (PC Like '[A-Z][0-9][A-Z] [0-9][A-Z][0-9]'),
PrePaidTip smallmoney not null Constraint ck_prepaidtip check (PrepaidTip >=0) Constraint DF_PrepaidTip Default 0,
RouteID int not null Constraint FK_ConsumerToDirection references Direction (DirectionID)
)
Create Table DeliveryType
(
DeliveryTypeID smallint not null Constraint PK_DelieverType primary key clustered,
DeliveryTypeDescription varchar(10) not null,
DeliveryTypeCharge smallmoney not null
)
Create Table Paper
(
PaperId smallint identity (1,1) not null Constraint PK_Paper primary key clustered,
PaperDescription varchar(30) not null
)
Create Table ConsumerPaper
(
ConsumerID int not null Constraint FK_ConsumerPaperToConsumer references Consumer (ConsumerId),
PaperID smallint not null Constraint FK_ConsumerPaperToPaper references Paper (PaperId),
DeliveryTypeID smallint not null Constraint FK_ConsumerPaperToDeliveryType references DeliveryType (DeliveryTypeId),
Constraint PK_ConsumerPaper_ConsumerID_PaperID primary key clustered (ConsumerID, PaperID)
)
CREATE PROCEDURE TransferHandler
(#HandlerIdOne INT = NULL,
#HandlerIdTwo INT = NULL,
#AreaID INT = NULL)
AS
-- guard clause - if something is wrong, call RAISERROR which
-- stops execution - no need to use "else" after that
IF #DHandleridone is NULL OR #Handleridtwo IS NULL OR #AreaID IS NULL
RAISERROR ('Missing parameter, please enter "id one" "id two" "area id" ', 16, 1)
BEGIN TRANSACTION
BEGIN TRY
-- update the first part
UPDATE dbo.handler
SET Salary = Salary - 25.00
WHERE handlerid = #HandlerIdOne
-- update the second part
UPDATE dbo.handler
SET Salary = Salary + 25.00
WHERE handlerid = #HandlerIdTwo
UPDATE dbo.handler
SET AreaID = null
WHERE handlerid = #HandlerIdOne
UPDATE dbo.handler
SET AreaID = #AreaID
WHERE handlerid = #HandlerIdTwo
-- if all goes well - commit the transaction
COMMIT TRANSACTION
END TRY
BEGIN CATCH
-- if an error occurred - show the error details
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() AS ErrorState,
ERROR_PROCEDURE() AS ErrorProcedure,
ERROR_LINE() AS ErrorLine,
ERROR_MESSAGE() AS ErrorMessage
-- roll back the transaction
ROLLBACK TRANSACTION
END CATCH

Answer 1

OK, so you could try something like this - using the TRY-CATCH feature available in SQL Server 2005 and newer:
CREATE PROCEDURE TransferHandler
(#HandlerIdOne INT = NULL,
#HandlerIdTwo INT = NULL,
#AreaID INT = NULL)
AS
-- guard clause - if something is wrong, call RAISERROR which
-- stops execution - no need to use "else" after that
IF #DHandleridone is NULL OR #Handleridtwo IS NULL OR #AreaID IS NULL
RAISERROR ('Missing parameter, please enter "id one" "id two" "area id" ', 16, 1)
BEGIN TRANSACTION
BEGIN TRY
-- update the first part
UPDATE dbo.handler
SET Salary = Salary - 25.00,
AreaId = NULL
WHERE handlerid = #HandlerIdOne
-- update the second part
UPDATE dbo.handler
SET Salary = Salary + 25.00,
AreaID = #AreaID
WHERE handlerid = #HandlerIdTwo
-- if all goes well - commit the transaction
COMMIT TRANSACTION
END TRY
BEGIN CATCH
-- if an error occurred - show the error details
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() AS ErrorState,
ERROR_PROCEDURE() AS ErrorProcedure,
ERROR_LINE() AS ErrorLine,
ERROR_MESSAGE() AS ErrorMessage
-- roll back the transaction
ROLLBACK TRANSACTION
END CATCH