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When developing Access 97 applications using VBA, you may have problems porting your application to other computers. Run time errors can occur from basic VBA commands, especially when rolling out
Using Swing, you can set the color of each node in Jtree. This is done by customizing your own TreeCellRenderer (overriding the DefaultTreeCellRenderer class), then calling the setBackgroundSelectionColor() method of
Question: Is there any way to test if a socket is still open without writing to it? Answer: Despite being relatively easy to use, the Socket class is not implemented
Question: In the first servlet we set the value for HTTP header as below: response.setHeader(“SessionKey”,”SessionValue”); In the next servlet we tried retrieving the above set header value as: request.getHeader(“SessionKey”); We
There are times when you’d like to know a little bit about how your Web page will print. For example, if you are dynamically generating reports, you can put a
I like the idea of clicking on a VB label that looks like a Web anchor and pops up the Web browser pointing the user to the page. Here is
When using C++, the Union enables programmers to look at the same memory area from different perspectives. The same is possible in Visual BASIC. There is an LSET statement that
Private Sub BubbleSort(varArray As Variant, bAscending As Boolean) ‘Option Base 0 is assumed Dim HoldEntry As Integer Dim SwapOccurred As Boolean Dim iItteration As Integer Dim i As Integer SwapOccurred
A simple way to get around having to handle Nulls in fields from recordset is to concatenate a zero length string at the end of the field value, as illustrated
Public Function ValidateTextToNumeric(ctlToValidate As TextBox)’**********************************’This function tests the validation’for Numeric value of a given text’**********************************Dim strTextToValidate As StringDim blnNumericValid As BooleanstrTextToValidate = ctlToValidate.Text’*** Validation would be TRUE, in all the
What is the simplest way to keep track of session information if the cookie is disabled in the client? Even though we have other alternative solutions like passing the session
On a form, basing populating controls on a supplied record may lead to error, because a perfect match is needed between the control tags and the field list. Any pre-specified
Let’s take an example: a program has a PrintSpooler class. This class maintains a queue for printer requests and serializes them. The program cannot contain multiple PrintSpooler Objects because this
The PrettyPrinter Add-in is a very simple VB5 and VB6 add-in that lets you print whole VB code modules or selected procedures, in both portrait or landscape mode. While the
VB now allows us to addcontrols to a Form at run time. In thisarticle I will try to explain a way in which you can dynamically add a control arrayto
n my series of articles, “Paranoid and Proud of It,” I pointed out that systems require different backup strategies, depending on the criticality of the information stored in them. SQL
he task of retrieving the top or bottom N rows from a database table (by salary, sales amount, credit, etc.) is often referred to as a “top-N query.” This task
n last month’s article I showed you how to create a calendar page in ASP with pop-up functionality. In this month’s article, I’ll show you how to make your pop-up
If you want to show online help (HTML Pages or images) through your applet by clicking the Help button or the F1 key or some other icon, you have to
Many C++ programmers will be familiar with the tidal wave of recompilations that occur when a seemingly unrelated header file is changed. C++ file dependencies need to be managed otherwise
Many C++ programmers will be familiar with the tidal wave of recompilations that occur when a seemingly unrelated header file is changed. C++ file dependencies need to be managed otherwise
There are two undocumented encryption functions. They are not supported by Microsoft, and I have had problems with some SQL Server service packs when using these functions. That being said,
By default, SQL Server 7.0 installation sets up SQL Server to run in a case insensitive mode. For most applications this may work great, but there are certain situations were
Certain applications require business logic to determine the last day of the month. This is the case for accounting applications that perform such tasks as invoice processing and customer billing.
When tuning SQL Server applications, a certain degree of hands-on experimenting must occur. Index options, table design, and locking options are items that can be modified to increase performance. When
Whenever a client application needs to send Transact-SQL to SQL Server, send it in the form of a stored procedure instead of a script or dynamic Transact-SQL. This not only
When a stored procedure is first executed (and it does not have the WITH RECOMPILE option), it is optimized and a query plan is compiled and cached in SQL Server’s
The new INSTEAD OF functionality is not exactly like a trigger, but similar. Unlike AFTER triggers, the INSTEAD OF trigger replaces the incoming transaction data modification statement with its own
Orphan SQL Server connections can decrease SQL Server performance. An orphan connection occurs when SQL Server keeps the connection open, even though it is not being used. There are two
This tip is for when you want to place an action after a time gap between two occurrences (for example, to invalidate an unused session after some permitted time, or
