7: Debugging and Error Handling in .NET

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7: Debugging and Error Handling
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update dbo.InventoryCount Set InvCount = InvCount + 1 where LocationId = @intLocationId if @@rowcount <> 1 begin -- business error Raiserror(50133, 16, 1) if @@tranCount > @intTrancountOnEntry rollback tran return 50133 end if @@tranCount > @intTrancountOnEntry commit tran return 0
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The following procedure demonstrates detection of logic errors from the nested stored procedure:
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Create procedure prInventory_Insert_XA -- insert new inventory and new equipment -- (demonstration of alternative method for error handling and transaction processing) @chvMake varchar(50), @chvModel varchar(50), @chvEqType varchar(30), @intLocationId int, @inyStatusId tinyint, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnsRent smallmoney, @mnsLease smallmoney, @mnsCost smallmoney, @inyAcquisitionTypeID int, @intInventoryId int output, @intEquipmentId int output as Set nocount on set xact_abort on
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SQL Server 2000 Stored Procedure & XML Programming
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declare @intError int, @intTrancountOnEntry int set @intError = 0 set @intTrancountOnEntry = @@tranCount if @@tranCount = 0 begin tran -- is equipment already in the database if not exists(select EquipmentId from Equipment where Make = @chvMake and Model = @chvModel) EXEC @intError = dbo.prEquipment_Insert @chvMake, @chvModel, @chvEqType, @intEquipmentId OUTPUT if @intError > 0 begin if @@tranCount > @intTrancountOnEntry rollback tran return @intError end exec @intError = dbo.prInsertInventory_XA @intEquipmentId, @intLocationId, @inyStatusId, @intLeaseId, @intLeaseScheduleId, @intOwnerId, @mnsRent, @mnsLease, @mnsCost, @inyAcquisitionTypeID, @intInventoryId output if @intError > 0 begin if @@tranCount > @intTrancountOnEntry ROLLBACK TRAN return @intError end if @@tranCount > @intTrancountOnEntry COMMIT TRAN return 0
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If an error has been returned, the current stored procedure will roll back the transaction (using Rollback Transaction) if a transaction has been initiated in it. The
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7: Debugging and Error Handling
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caller stored procedure can also be designed so that it knows about all (or some) error codes that can be returned from a nested stored procedure. Then it is possible to write code that will handle the errors. To test it, run the following:
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declare @intError int, @intInvId int, @intEqId int begin tran exec @intError = prInventory_Insert_XA @chvMake = 'Compaq', @chvModel = 'IPaq 3835', @chvEqType = 'PDA', @intLocationId = 12, @inyStatusId = 1, @intLeaseId = null, @intLeaseScheduleId = 1, @intOwnerId = 411, @mnsRent = null, @mnsLease = null, @mnsCost = $650, @inyAcquisitionTypeID = 1, @intInventoryId = @intInvId output, @intEquipmentId = @intEqId output if @intError = 0 commit tran else rollback tran select @intError Err select * from Inventory where InventoryId = @intInvId select * from Equipment where EquipmentId = @intEqId
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In the case of an error, SQL Server returns the error message and rolls back the transaction:
Server: Msg 50133, Level 16, State 1, Procedure prInsertInventory_XA, Line 48 Unable to update inventory count. Err ----------50133 (1 row(s) affected)
SQL Server 2000 Stored Procedure & XML Programming
Inventoryid EquipmentId LocationId StatusId LeaseId LeaseScheduleId ----------- ----------- ----------- -------- ------- --------------(0 row(s) affected) EquipmentId Make Model ----------- -------------------------------------------------- ------(0 row(s) affected)
CHAPTER
Special Types of Procedures
IN THIS CHAPTER:
Types of Stored Procedures User-Defined Functions Triggers Views
SQL Server 2000 Stored Procedure & XML Programming
his chapter examines other types of procedures available in the SQL Server environment:
Special types of stored procedures User-defined functions Triggers Views Some of these procedures are just special types of stored procedures, whereas others are completely different types of database objects. However, they all share a common attribute: they are used to describe or implement an algorithm for the purpose of achieving some result.
Types of Stored Procedures
There are six types of stored procedures: User-defined System Extended Temporary Global temporary Remote
User-Defined Stored Procedures
As you may infer from the name, user-defined stored procedures are simply groups of Transact-SQL statements assembled by administrators or developers and compiled into a single execution plan. The design of this type of stored procedure is the primary focus of this book.
System Stored Procedures
Microsoft delivers a vast set of stored procedures as a part of SQL Server. They are designed to cover all aspects of system administration. Before Microsoft SQL Server 6.0, you had to use scripts from isql to control the server and their databases. Although administrators today customarily use Enterprise Manager, system stored
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