barcode generator vb.net free Debugging and Error Handling in Software

Creator PDF 417 in Software Debugging and Error Handling

Debugging and Error Handling
Reading PDF-417 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Making PDF417 In None
Using Barcode printer for Software Control to generate, create PDF 417 image in Software applications.
Create Procedure prInsertLeasedAsset_5 -- Insert leased asset and update total in LeaseSchedule. ( @intEquipmentId int, @intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnyLease money, @intAcquisitionTypeID int ) As set nocount on Declare @intErrorCode int Select @intErrorCode = @@Error begin transaction If @intErrorCode = 0 begin insert asset insert Inventory(EquipmentId, StatusId, Lease, values ( @intStatusId, @mnyLease, Select @intErrorCode = @@Error end If @intErrorCode = 0 begin update total LocationId, LeaseId, AcquisitionTypeID) @intLeaseId, @intAcquisitionTypeID)
Read PDF417 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
PDF 417 Printer In Visual C#
Using Barcode creation for VS .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications.
LeaseScheduleId, OwnerId, @intEquipmentId, @intLocationId, @intLeaseScheduleId,@intOwnerId,
Creating PDF 417 In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
PDF-417 2d Barcode Creator In VS .NET
Using Barcode encoder for .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
SQL Server 2000 Stored Procedure Programming
Making PDF 417 In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create PDF417 image in Visual Studio .NET applications.
Bar Code Generator In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId Select @intErrorCode = @@Error end If @intErrorCode = 0 COMMIT TRANSACTION Else ROLLBACK TRANSACTION return @intErrorCode
Code 39 Extended Drawer In None
Using Barcode creator for Software Control to generate, create Code 3 of 9 image in Software applications.
UPC-A Supplement 2 Printer In None
Using Barcode creator for Software Control to generate, create UPC A image in Software applications.
If an error occurs, the If statements prevent further execution of the business logic and pass an error to the end of the procedure. Changes will be rolled back, and the stored procedure returns the value of the @intErrorCode variable to the calling stored procedure or script. If an error occurs, this variable may be used to notify the calling procedure that there was a problem.
Create GS1-128 In None
Using Barcode creation for Software Control to generate, create EAN128 image in Software applications.
EAN 13 Generator In None
Using Barcode drawer for Software Control to generate, create GTIN - 13 image in Software applications.
Nested Stored Procedures
Create MSI Plessey In None
Using Barcode drawer for Software Control to generate, create MSI Plessey image in Software applications.
Creating Code 128 Code Set C In None
Using Barcode encoder for Online Control to generate, create Code 128 image in Online applications.
The calling stored procedure might have the same error handling system in place. In such a case, calls to the stored procedures should treat the returned values as error codes:
Making Bar Code In Java
Using Barcode generation for Android Control to generate, create barcode image in Android applications.
Generate Barcode In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
... If @ErrorCode = 0 Begin execute @intErrorCode = MyStoredProcedure @parm1, @param2 End
Bar Code Decoder In VB.NET
Using Barcode Control SDK for Visual Studio .NET Control to generate, create, read, scan barcode image in .NET applications.
Painting USS Code 128 In Objective-C
Using Barcode generation for iPhone Control to generate, create USS Code 128 image in iPhone applications.
The method works like a cascade that stops all further processing in a whole set of nested stored procedures.
Creating Code 39 In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Code 39 image in .NET applications.
Generating UPC A In Objective-C
Using Barcode generator for iPhone Control to generate, create UPC-A image in iPhone applications.
Interfacing to Other Environments
This error handling structure is very useful even in cases when a stored procedure is called from another programming environment, such as Visual Basic or Visual C++. The return value of a stored
7:
Debugging and Error Handling
procedure can be retrieved, and an error can be handled on that level as well.
conn.Open "provider=sqloledb;data source=sqlserver;" + _ "user id=sa;password=;initial catalog=Asset" With cmd Set .ActiveConnection = conn .CommandText = "prInsertLeasedAsset_5" .CommandType = adCmdStoredProc .Parameters.Refresh .parameters(1).Value = .parameters(2).Value = .parameters(3).Value = .parameters(4).Value = .parameters(5).Value = .parameters(6).Value = .parameters(8).Value = Set rs = .Execute() lngReturnValue = .Parameters(0).Value end with If lngReturnValue <> 0 Then MsgBox "Procedure have failed!" Exit Sub Else MsgBox "Procedure was successful" end if 4 1 1 1 1 1 1
.parameters(7).Value = 99.95
Other Global Variables
Cases should be handled with the same Select statement that reads @@Error when you wish to read the value of some other global variables immediately after the statement. You often require such a technique when you are using identity columns.
insert Inventory(EquipmentId, StatusId, LocationId, LeaseId,
LeaseScheduleId, OwnerId,
SQL Server 2000 Stored Procedure Programming
Lease, values ( @intStatusId, @mnyLease, Select @intErrorCode = @@Error,
AcquisitionTypeID) @intLeaseId, @intAcquisitionTypeID)
@intEquipmentId, @intLocationId, @intLeaseScheduleId,@intOwnerId,
@intInventoryId = @@identity
Transaction Processing
You can integrate transaction processing perfectly with this solution. Review 5 to remind yourself why Rollback and Commit must be treated differently. At the beginning of a stored procedure or transaction, the developer should add the following code:
Declare @intTransactionCountOnEntry int If @intErrorCode = 0 Begin Select @intTransactionCountOnEntry = @@TranCount BEGIN TRANSACTION End
At the end of the procedure (and/or transaction), the developer should complete the transaction:
If @@TranCount > @intTransactionCountOnEntry Begin If @intErrorCode = 0 COMMIT TRANSACTION Else ROLLBACK TRANSACTION End
The solution will also perform well in the case of nested stored procedures. All procedures are rolled back using the same cascading mechanism. The local variable @TransactionCountOnEntry is used to track the number of opened transactions upon entry into a stored procedure. If the number is unaffected within the stored procedure,
7:
Debugging and Error Handling
there is no reason either to Commit or Rollback within the procedure. The finished stored procedure looks like this:
Alter Procedure prInsertLeasedAsset_6 -- Insert leased asset and update total in LeaseSchedule. ( @intEquipmentId int, @intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnyLease money, @intAcquisitionTypeID int, @intInventoryId int OUTPUT ) As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int Select @intErrorCode = @@Error If @intErrorCode = 0 Begin Select @intTransactionCountOnEntry = @@TranCount BEGIN TRANSACTION End If @intErrorCode = 0 begin -- insert asset insert Inventory(EquipmentId, StatusId, Lease, values ( LocationId, LeaseId, AcquisitionTypeID)
LeaseScheduleId, OwnerId, @intEquipmentId, @intLocationId,
Copyright © OnBarcode.com . All rights reserved.