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DevX - Software Development Resource

Passing Primitive Data by Reference

Primitive datatypes in Java are always a passby value. You can pass them by reference, by wrapping the data in to single element array. Here is the code (Tested on

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Prevent Default Value Selections in a List Box

A pretty typical scenario is a drop-down list box with a standard default selection that instructs the user to choose an option. It is enclosed in tags, which the user

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GET and POST Requests

Question: How does a servlet handle GET and POST requests? Answer: The HttpServlet abstract class, defined in the javax.servlet.httppackage, contains several methods that simplify interacting with HTTPrequests. Two of the

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ResultSet Positioning

Question: How can I access the next and previous rows in a ResultSet when Iconnect to a database through a JDBC driver? Answer: The JDBC 1.0 API only allows you

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Multiselect Drop-down Box

Question: I need to have a drop-down box (combo probably) which allows multiple selections. The list box does this but there is no room to have the number of list

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ADO and Large Tables

Question: I have several MS Access97 database tables that are larger than 120 MB. When I use ADO to open the entire table it seems to try to load the

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Dumping Tables

Question: Using JDBC, how can I turn a database table into a series of SQL INSERT statements that can recreate the table? Answer: Dumping a database table into a set

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JDBCTest ClassNotFoundException

Question: I’m trying to test the JDBC-ODBC bridge with JDBCTest tool and itgives me the following error: registerDriver() Failed:java.lang.ClassNotFoundException: sun/jdbc/odbc/JdbcOdbcDriver What’s the problem? Answer: It looks like the jar file

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Enumerate Flags for Easier Coding

If you do a lot of work with the Windows API, you might notice that some API functions have flag-type parameters, and you usually pass API constants as the values

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Add Option/Checkbox Toggle Capability in VB4/32

VB5 introduced a Style property of the checkbox or option button, with a graphical setting that makes the button or checkbox appear to be a command button instead of its

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Prevent Reposting of Forms in VID 6

By clicking the browser’s refresh button, users often add unwanted records into your database. If you are using the Scripting Object Model (SOM) in Visual InterDev 6, you can thwart

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Break Out of Frames

Question: What is the correct syntax for forcing a page to break out of a frameset that might call it? Answer: The way to make sure that your document isn’t

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Variable Returning Matches in a Select Query

Question: What is the variable that returns the number of matches in a select query? I thought I’d seen a reference to a variable (something like “_COUNT”) but now I

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Place JavaScript In Separate Files

Question: I want to create a library of generic JavaScript functions. Is it possible to write different functions in different files, and use the functions within other files by “including”

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Break Out of Those Frames

So you’ve designed your page just perfectly so all the content screams at the user to be noticed. Unfortunately, sites that link to your site have decided to place their

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AWT Thread Interaction

Question: I have two threads in an application. Thread A displays a form andallows the user to interact with it, thread B executes a loop whichcontinually retrieves data and updates

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Textfield Alignment

Question: How do I right align numbers in a textfield? Answer: This is yet another example of why the Swing classes should be used inlieu of the AWT classes. Swing

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Initializing A ResultSet

Question: I am building a prototype but am trying to make the code as reuseableas possible. To test the prototype, I need to simulate a ResultSetbeing returned from a database.

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C-Style Function Pointers

Question: While trying to port some C code to a C++ implementation, I ran into this problem. The module this came out of was designed to “automate data handling used

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Languages Used for Windows Programs

Question: I need to know what languages are used in the implementation and programming of Windows 95 et al. (Windows 98, Windows NT, and Windows 2000). Any help or referrals

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Display an Alert After the Page Loads

Question: How do I make an alert box pop up 10 seconds after the page loads? Answer: You can display an alert a certain length of time after the page

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Outlook Client Locks Up

Question: We have someone using PPTP to connect to our Exchange server. He is able to use the intranet without problems. He can even get into Outlook, but the troubles

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New Versus Malloc()

Question: Why is it necessary to typecast the return value of malloc() but not for the new operator? This question has been asked of many C++ experts but no one

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Removing cc:Mail Connector

Question: I need to remove the cc:Mail connector. How do I do this? Answer: Though it would seem intuitive to select the connector and click Delete but that actually won’t

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Duplicate Holidays on Outlook Calendar

Question: Because my work and home computers were accidentally set to different time zones when I imported Calendar info from one system to the other, I ended up with multiple

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Dynamic Views Using the System Date

Question: I have a user who wants me to create a dynamic search view where the data retrieved is effective within the last six months using the system date. Is