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You can debug your stored procedures even if you do not have TSQL Debugger (that is, if your environment does not comply with all the requirements). Before debuggers became part of the programming environment, developers used simple techniques to print the contents of variables and follow the execution of code. Some programming languages include commands (for instance, Assert in Visual Basic 6.0) that are active only during debugging. In others, you simply add print commands during the development stage and comment them out before releasing the code into production. In Transact-SQL, I use a very simple technique that allows me to view the contents of the variables and recordsets when I am testing a stored procedure from Query Analyzer. I add

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In the stored procedure, at all important points, I add code that tests the value of the @debug variable and displays the values of selected variables or resultsets:

if @debug <> 0 select @chvProperty Property, @chvValue [Value], @chvUnit [Unit] . . . if @debug <> 0 select * from #Properties

It does not support the display of resultsets. In older versions, it was impossible to concatenate a string inside a Print statement. Some utilities handle messages from the Print statement differently than they do the resultset from the Select statement.

Before executing, you need to specify the ConnectionString and ErrorLog attributes of the object. In the following case, we also set the object to accept XML

In the following example, you can see a stored procedure that is designed to support this kind of testing:

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The buffer manager is responsible for writing these updates to disk in a way that coordinates with logging and transaction management..

Alter Procedure prGetInventoryProperties_2 -- Return comma-delimited list of properties -- which are describing asset. -- i.e.: Property=Value unit;Property=Value unit;... @intInventoryId int, @chvProperties varchar(8000) OUTPUT, @debug int = 0 ) As (

set nocount on declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50), @insLenProperty smallint, @insLenValue smallint, @insLenUnit smallint, @insLenProperties smallint declare @chvProcedure sysname set @chvProcedure = 'prGetInventoryProperties_2' if @debug <> 0 select '**** '+ @chvProcedure + 'START ****' 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 if @debug <> 0 select * from #Properties -- set loop select @intCountProperties = Count(*), @intCounter = 1,

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@chvProperties = '' from #Properties -- loop through list of properties while @intCounter <= @intCountProperties begin -- get one property select @chvProperty = Property, @chvValue = Value, @chvUnit = Coalesce(Unit, '') from #Properties where Id = @intCounter if @debug <> 0 select @chvProperty Property, @chvValue [Value], @chvUnit [Unit] -- check will new string fit select @insLenProperty = DATALENGTH(@chvProperty), @insLenValue = DATALENGTH(@chvValue), @insLenUnit = DATALENGTH(@chvUnit), @insLenProperties = DATALENGTH(@chvProperties) if @insLenProperties + 2 + @insLenProperty + 1 + @insLenValue + 1 + @insLenUnit > 8000 begin select 'List of properties is too long ' + '(over 8000 characters)!' return 1 end -- assemble list set @chvProperties = @chvProperties + @chvProperty

@chvUnit + '; '

fragments, and to drop and generate the target table, by setting the XMLFragment, SGDropTables, and SchemaGen attributes to True:

select @chvProperties chvProperties -- let's go another round and get another property set @intCounter = @intCounter + 1 end drop table #Properties if @debug <> 0 select '**** '+ @chvProcedure + 'END ****' return 0

Execution in a Test Environment To debug or test a stored procedure, I execute the stored procedure from Query Analyzer with the @debug parameter set to 1.

declare @chvResult varchar(8000) exec prGetInventoryProperties @intInventoryId = 5, @chvProperties = @chvResult OUTPUT, @debug = 1 select @chvResult Result

Naturally, you can pass parameters either by name or by position. The result of the execution will be an elaborate printout like the one shown in Figure 7-6. Execution in the Production Environment In production, the stored procedure is called without a reference to the @debug parameter. Here, SQL Server assigns a default value to the parameter (0), and the stored procedure is executed without debug statements.

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Figure 7-6.

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