As a database administrator, it is your responsibility to be concerned about anything that might affect the stability of your systems. In that vein, it is not enough to back

When a class is instantiated, the subsequent object is actually an instance of the most derived class in the class hierarchy. This means that even if a class is referenced

A cross cast converts a multiply-inherited object to one of its secondary base classes. To demonstrate what a cross cast does, consider this class hierarchy: struct A{ int i; virtual

Question: I have a table in SQL Server 6.5 with a datetime column that is used for tracking each time an event occurs; the date and time data are combined

When accepting input from an HTML form, you can’t assume that the user will provide the right type of data–you have to validate. For instance, if your application expects users

An extended stored procedure called xp_cmdshell causes SQL Server to spawn a command shell and execute the command given as a parameter. For example, xp_cmdshell ‘dir c:mssqlackup’ would return a

Instances of java.awt.Dialog are often used to display error messages in an application. As a result, you may find yourself writing a component that displays a message in a Dialog

You can use typeid to retrieve the type information of non-polymorphic objects and fundamental types. However, the result in this case refers to the static type of the object rather

Question: Is there an easy way to hide a drop-down tab without using the mouseout, mousemove, or mouseover events? These dynamic drop-down tabs are layered and in a framed page.

Question: How can I add a Share in Visual Basic to a Local or Remote Machine with permission only for a special User group? Answer: That is a rather difficult

Question: How do I grab a file’s absolute path, given a filename? Answer: All you have to do is create a File object corresponding to the filename and call getAbsolutePath().

Question: Does Java have a MOD function? Answer: The Java language has a built-in operator to perform modulus division. It is the same as that of the C and C++

Question: How can I call the Windows color dialog box in Powerbuilder 6.0? Answer: To use the Windows standard color chooser dialog, you will need to declare and use some

Question: I can’t use the LogonUser function because I don’tknow how to set (with program, if possible) the SE_TCB_NAME privilege. When I use your program that shows the use of

Question: My batch files don’t run anymore. I’ve changed the association for editting them, and now that is the default action. Also, the “add” button is disabled in the edit

Question: How can I find and replace a substring of a String? Answer: The String class is immutable. That is, once you have created a String, you cannot change its

You may have been surprised and frustrated to find that in some cases, the Java Virtual Machine (JVM) does not stop running when your application exits the static main() method.

JavaScript has C-like syntax. Therefore, it is possible to use the ?: conditional operator, which is a shortcut for the if-else block: Expression?true part:false part Try this example:

One of the hardest tasks until now has been supporting searches on text fields. As we know, indexes can’t be built on text fields and so searches on these fields

When an exception is thrown, the runtime mechanism first searches for an appropriate handler (a catch statement) for it in the current scope. If such a handler does not exist,

Question: Is there any way to resize dialog boxes in Internet Explorer? Answer: No, there isn’t any way to resize dialog boxes in IE. The size of the dialogs displayed

Developers commonly want to ensure that a user accesses only the data through their application. After all, not every person should be let near a server with Microsoft Access. However,

The Active Server Pages Session object includes an under-used property called LCID. The LCID, or locale identifier, helps you format your ASP code to suit your target audience.For instance, Canada

The terms abstract data type and abstract class refer to two entirely different concepts, although both of them use the word ‘abstract’ due to a historical accident. An abstract data

Java’s PipedInputStream and PipedOutputStream classes allow you to write data to an OutputStream object and to read this data from an InputStream object (see tip “Pass Data Between Threads Using

As a database administrator, you will unfortunately be called upon to respond at times when you are not at your best. It is exactly at those times that you need

Sometimes you may want to automatically select all the text in a text box when it receives focus. This saves your user from having to hit delete or backspace to

The access specifier of a base class member can be changed in a derived class by an access declaration, as in this example: class A{public: int n; };class D :