[float]s and [double]s are useful for graphics and possible statistics.However they are not recommended for certain calculations requiring absoluteaccuracy, such as when they involve money . That’s because the results

The java.net.ServerSocket class implements a server socket. A server socket waits for requests to come in over the network. It performs some operation based on that request, and then possibly

Sorting arrays of primitive types (byte, char, double, float, int, long, and short) is easy.Example: import java.util.*;import java.awt.*;class SortDBL // Sorts an array of randomly generated double values.{ public static

This interface defines the way in which objects are to be compared. Anobject that implements this can be sorted as easily as any primitive, such asthe [String] class… import java.util.*;import

It is a common task for servlet (JSP) developers to have to display something with a server-based operation (calculation) that wastes a lot of time. Suppose you have a very

If you have a whole-number counter, for example in a loop or record counter, consider using a datatype of PLS_INTEGER instead of INTEGER or NUMBER. When declaring an integer variable,

You can use methods of java.lang classes for all of the functions found built-in to other databases. For example, you can call the static method java.lang.Math.abs, which is similar to

Direct access of a NULL in a column does not cause any problems in SQL-J. If you use that value as a parameter in a Java method or as a

If you’ve ever used SQL commands against the ADO Connection object, you might have had a problem allowing the user to enter text that contains an apostrophe: ADOCon.Execute “Insert Into

ADO and RDO do not support Oracle cursor types; neither Microsoft nor Oracle drivers provide appropriate conversion. As a result, you cannot use Oracle stored procedures from VB or Active

It’s often useful to sort a DBGrid field in either descending or ascending order. You do this by using the HeadClick event and the DataField property of columns. You must

When you write Insert statements, it can be difficult to accommodate the possible values end users might enter into a textbox. The most common task is replacing single quotes with

If you use an MSFlexGrid control to display data returned in an ADO recordset, you can use this code to dynamically populate the grid?including the header row?with the information in

In Microsoft Knowledge Base article Q217114, “How to: Implement Array Arguments in Visual Basic COM Objects for Active Server Pages,” Microsoft says you can’t pass an array to a COM

The MSFlexGrid tries to automatically determine how to justify text. If the first character is numeric, then that cell will be right-justified. If it is an alphanumeric character, then that

If you usually use DSN-less connections with ADO, you know it can sometimes be a pain to figure out the correct connect string. In that case, you can let the

Often you need a data structure similar to a two-dimensioned array or collection, but you need to manipulate it. For example, you need to sort on certain columns, filter certain

Sometimes you want to give your DataGrid the ability to edit fields, while the original data in the field is highlighted. Normally, you can click on the field to start

If you’re developing multiuser Jet-based applications, you probably know about Microsoft’s msldbusr.dll. It allows you to read the Jet lock files and get the correct number of connected users and

Suppose you have a table with this field: Customer_Code You can retrieve the field in many ways: rs.(0)rs(“Customer_Code”)rs.fields(0)rs.fields(“Customer_Code”)rs.fields.item(0)rs.fields.item(“Customer_Code”) In VBScript, the versions that use field indexes instead of names are

Consider the Data Definition Language statements: “ALTER TABLE [My Table] ADD COLUMN [My New Field] Single” and “ALTER TABLE [My Table] ADD COLUMN [My New Field] Double”. According to Microsoft

Most of my end users use laptops, which can have a wide variety of spreadsheet software installed. I often use this function when working with database tables or queries to

When building SQL statements, use the Tag property to hold the Field Name and Data Format. I use a naming convention of str, int, dat, and so on to determine

If you can be sure that your users are only running Internet Explorer 4.0 or higher, you can take advantage of Remote Data Services (RDS), now part of MDAC 2.x.

The most common way to call a script function is to have an element trap an event, which in turn calls the function, as in: Click here But what if

There are basically two ways to get recordsets with Remote Data Services (RDS). You can either use the system-provided RDSServer.DataFactory object or you can write your own full-blown custom business

One of the handy features of working with the ActiveX Data Object (ADO) is the ability to load the results of SQL select statements into a Recordset. Once you have

When you trap a keyboard event with any of the keyboard event handlers (onKeyUp, onKeyDown, or onKeyPress), the event object’s keyCode property contains the character value of the key that

One of the most common mistakes developers can make is to extensively use global variables. While they are sometimes necessary, global variables can cause problems in code that are both

Microsoft’s IE4 supports the ability to change just about any CSS1 style attribute dynamically. To access an element’s style, use the style object property that corresponds to the style attribute.