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Another example could be a stored procedure that returns a list of properties assigned to an asset in the form of a string:
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Create Procedure GetInventoryProperties /* Return comma-delimited list of properties that are describing asset. i.e.: Property = Value Unit;Property = Value Unit;Property = Value Unit;Property = Value Unit;Property = Value Unit;... */ ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT ) As declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50) Create table #Properties( Id int identity(1,1), Property varchar(50), Value varchar(50), Unit varchar(50)) -- identify Properties associated with asset insert into #Properties (Property, Value, Unit) select Property, Value, Unit from InventoryProperty inner join Property on InventoryProperty.PropertyId = Property.PropertyId where InventoryProperty.InventoryId = @intInventoryId -- set loop select @intCountProperties = Count(*), @intCounter = 1, @chvProperties = '' from #Properties -- loop through list of properties while @intCounter <= @intCountProperties
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begin -- get one property select @chvProperty = Property, @chvValue = Value, @chvUnit = Unit from #Properties where Id = @intCounter -- assemble list set @chvProperties = @chvProperties + '; ' + @chvProperty + '=' + @chvValue + ' ' + @chvUnit
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-- let's go another round and get another property set @intCounter = @intCounter + 1 end drop table #Properties return 0
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Unconditional Execution the GoTo Statement
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The GoTo statement forces the server to continue the execution from a label:
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GoTo label ...
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label:
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The label has to be within the same stored procedure or batch. It is not important whether the label or the GoTo statement is defined first in the code. The label can even exist without the GoTo statement to which it is pointing. Naturally, the server will report an error if it encounters a GoTo statement that points to a nonexistent label. The following stored procedure uses the GoTo statement to interrupt further processing and display a message to the user when an error occurs:
Create Procedure prCloseLease -- Clear Rent, ScheduleId, and LeaseId on all assets associated
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Basic Transact-SQL Programming Constructs
-- with specified lease. @intLeaseId int As -- delete schedules Update Inventory Set Rent = 0, LeaseId = null, LeaseScheduleId = null Where LeaseId = @intLeaseId If @@Error <> 0 Goto PROBLEM -- delete schedules Delete from LeaseSchedule Where LeaseId = @intLeaseId If @@Error <> 0 Goto PROBLEM -- delete lease Delete from Lease Where LeaseId = @intLeaseId If @@Error <> 0 Return 0 PROBLEM: Select 'Unable to remove lease from the database!' Return 1 Goto PROBLEM
To GoTo or Not to GoTo That Is the Question
The use of the GoTo statement is a very controversial issue. For example, if a language contains an If statement and a GoTo statement, all other flow-control statements are optional. On the other hand, extensive use of the GoTo statement leads to unmanageable code often referred to as spaghetti code (see Figure 4-2). A stigma became attached to the GoTo statement shortly after Edsger Dijkstra published a paper entitled Go To Statement Considered Harmful in Communications of the ACM in 1968. He observed that the number of GoTo statements in a body of code is inversely proportional to the quality of the code.
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Figure 4-2.
Spaghetti code
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Basic Transact-SQL Programming Constructs
Intense discussions followed for many years and brought to light the following points:
Code that does not contain a GoTo statement is easier to read and understand. Code that uses GoTo statements is also difficult to format in a manner that emphasizes its logical structure. The use of GoTo statements sometimes leads the compiler to produce a slower and larger executable. The use of GoTo statements tends to spread like termites. If their use is allowed in the environment, pretty soon they will appear both where they should and where they should not. Code that does not contain GoTo statements is easier to debug and test. The use of GoTo statements contradicts the principles of structured programming.
The question is: Should the GoTo statement be used In my opinion, the overuse of GoTo statements is more a symptom than a cause of low-quality code. In some cases, their use is justified, but the developer must be sure that such is the case and that it is not possible to produce a better solution using other programming constructs. For example, the following loop can be implemented using GoTo, but I recommend that you use While instead:
Create Procedure prLoopWithGoTo -- just an example how to implement loop using If and Goto As declare @MaxCounter int, @Counter int Select @MaxCounter = Max(EquipmentId), @Counter = 1 from Equipment LOOP: if @Counter < @MaxCounter begin
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