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Advanced Stored Procedure Programming
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-- get log space info. for all databases If @intErrorCode = 0 Begin Insert Into #DBLogSpace Exec ('DBCC SQLPERF (LogSpace)') set @intErrorCode = @@Error end -- get percent for specified database if @intErrorCode = 0 begin select @fltPercentUsed = LogPercentUsed from #DBLogSpace where dbname = @chvDbName set @intErrorCode = @@Error end drop table #DBLogSpace return @intErrorCode
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You can test this stored procedure from Query Analyzer, as shown on Figure 10-7. These techniques were extremely important before SQL Server 2000. It is now possible to use the table datatype as a return value for user-defined functions. We showed how can you use table-valued user-defined functions in 9. Unfortunately, it is (still) not possible to use a table variable as the output parameter of a stored procedure. You have another option when you want to pass a resultset (or multiple resultsets) to a calling stored procedure. You can use the cursor datatype as the output parameter of a stored procedure. In the following example, prGetInventoryProperties_CursorGet creates
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SQL Server 2000 Stored Procedure Programming
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Figure 10-7.
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Percentage of log space used in a specified database
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and opens a cursor. It is then returned as a cursor output parameter to the calling procedure:
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Create Procedure prGetInventoryProperties_CursorGet -- Return Cursor that contains properties -- that are describing selected asset. ( @intInventoryId int, @curProperties Cursor Varying Output ) As Set @curProperties = Cursor Forward_Only Static For Select Property, Value, Unit
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Advanced Stored Procedure Programming
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From InventoryProperty inner join Property On InventoryProperty.PropertyId = Property.PropertyId Where InventoryProperty.InventoryId = @intInventoryId Open @curProperties Return 0
The nested stored procedure will be called from following stored procedure:
Create Procedure prGetInventoryProperties_UseNestedCursor -- return comma-delimited list of properties -- that are describing asset. -- i.e.: Property = Value unit;Property = Value unit; -- Property = Value unit;Property = Value unit;... ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT, @debug int = 0 ) As Declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50), @insLenProperty smallint, @insLenValue smallint, @insLenUnit smallint, @insLenProperties smallint Set @chvProperties = '' Declare @CrsrVar Cursor
SQL Server 2000 Stored Procedure Programming
Exec prGetInventoryProperties_CursorGet @intInventoryId, @CrsrVar Output Fetch Next From @CrsrVar Into @chvProperty, @chvValue, @chvUnit While (@@FETCH_STATUS = 0) Begin Set @chvUnit = Coalesce(@chvUnit, '') 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 chrs)!' Return 1 End -- assemble list Set @chvProperties = @chvProperties + @chvProperty + '=' + @chvValue + ' ' + @chvUnit + '; '
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Advanced Stored Procedure Programming
If @debug <> 0 Select @chvProperties chvProperties Fetch Next From @CrsrVar Into @chvProperty, @chvValue, @chvUnit End Close @CrsrVar Deallocate @CrsrVar Return 0
It is the responsibility of the caller to properly close and deallocate the cursor at the end.
TIP: You should not use a cursor as an output parameter of a stored procedure unless you have to. Such a solution is inferior because procedures are coupled and prone to errors. If you are working with SQL Server 2000, you should use table-valued user-defined functions instead.
USING IDENTITY VALUES
In previous chapters, we introduced the function of identity values in a table. They are used to generate surrogate keys unique identifiers often based on sequential numbers.
A Standard Problem and Solution
Identity values are similar to the Autocount datatype in Access tables. But there is one difference that generates many questions in Usenet newsgroups among developers who are used to Access/DAO behavior. When a developer uses a resultset to insert a record into a table, the value of the AutoNumber field is immediately available in Access. Unfortunately, due to the nature of the client/server environment, this is not the case with recordsets in SQL Server.
SQL Server 2000 Stored Procedure Programming
The best way to insert a record into a SQL Server table and obtain an identity key is to use a stored procedure. The following stored procedure prInsertInventory is such a solution. A new record is first inserted into a table and then the key is read using the @@identity function/global variable.
Create Procedure prInsertInventory -- insert inventory record and return Id @intEquipmentId int, @intLocationId int, @inyStatusId tinyint, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnsRent smallmoney, @mnsLease smallmoney, @mnsCost smallmoney, @inyAcquisitionTypeID int, @intInventoryId int output As Set Nocount On Declare @intErrorCode int Select @intErrorCode = @@Error If @intErrorCode = 0 Begin Insert into Inventory (EquipmentId, LocationId, StatusId, LeaseId, LeaseScheduleId, OwnerId, Rent, Lease, Cost, AcquisitionTypeID) Values ( @intEquipmentId, @intLocationId, @inyStatusId, @intLeaseId, @intLeaseScheduleId, @intOwnerId, @mnsRent, @mnsLease, @mnsCost, @inyAcquisitionTypeID) Select @intErrorCode = @@Error, @intInventoryId = @@identity End Return @intErrorCode
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