In this article I show you my ordinary code structure for COM+ components. I show this in preparation for further articles about debugging tips. When I show this example, I
The standard way to delete all the rows in a SQL Server table is a DELETE statement without a WHERE clause:DELETE FROM MyTable However, in most cases you can speed
The built-in ++ and?operators can appear on both sides of their operand: int n=0;++n; // prefix ++n++; // postfix ++ You probably know that a prefix operator first changes its
The algorithm fill() is declared in as follows: void fill(ForwardIterator f, ForwardIterator l, const T&); The arguments f and l mark the sequence’s beginning and end, respectively. fill() fills the
You can allocate a multidimensional array using new as follows: class A{public: int j;//…constructor, destructor, etc.}void func(){ int m; A (*pa)[2][2]=new A[2][2][2]; // three dimensional array m=pa[0][0][0].j; // access member
Novices, especially those who have experience with garbage-collected languages, are often confused with the concept of object deallocation and destruction in C++. They tend to explicitly invoke every object’s destructor
A definition of namespace alias can be used to redefine a previously defined namespace alias declared in that scope, as long as the new definition refers only to the same
Question: How do you integrate an ad-serving technology (such as one by Doubleclick that enables you to rotate ads on a regular Web page) onto a cell phone or PDA?
Question: Is the IIF function valid under SQL server 7.0? It’s in the SQL Books Online as valid, but none of my stored procedures accept it. Answer: The IIF function
String in Java is a constant object, which means by default it can becreated and read but not modified. Usually developers use the Stringextensively but forget the overhead it may
Many programmers believe that by storing pointers instead of objects in a container, they improve performance. However, they forget that the pointers still refer to existing objects that must be
The stack is a region of memory on which local automatic variables are created and function arguments are passed. The implementation allocates a default stack size per process. On modern
Consider the following two classes: class A{private: int n;public: int m;};class B{private: int n; int m;}; Theoretically, the memory layout of these two classes may be different because A has
To block a class from being derived any further, declare its constructor private. Next, add a public static member function Instance() that creates an instance of this class and returns
When you declare a nested class as a friend of its containing class, place the friend declaration after the declaration of the nested class, not before: class A // containing
Question: I’m trying to install a search facility on a database program I have written using VB6 and an Access database. I’ve opened by inserting a data control onto my
Question: I’d like to know how can I make a return of a function’s local variable (for example, a reference to it) not using pointers technique? Answer: You have tow
Question: I am getting a compile error ‘huge’ obsolete keyword. I am converting a process from Visual C++ 2.0 to 6.0. What keyword could I use in place of ‘huge’?
Question: How can I dynamically build a procedure call string and then get it to execute? Ex. Dim action as String action = “proc(param1,param2)” call action I know this does
Question: In MFC, what does the following declaration do? CPen::operator HPEN() const; My understanding of the operator keyword is that you cannot use it to create a new operator; however,
This control lets you have two applications that communicate with each other. Just select the target application by its handle or partial/whole caption, set the string or the Long data
When you use JIT activation in particular there is a special situation that you have to be prepared for. While discussing that issue, I will also show a trap when
When working with a forward-only, read-only Recordset – that is, the default ADO Recordset – the RecordCount property always returns -1. (This can also happen with other types of server-side
Suppose you have two tables named Table1 and Table2 with one or more fields named the same way. Now, consider this query: rs.Open “SELECT * FROM table1 INNER JOIN table2
The syntax for opening a password-protected Jet database might not be obvious. In fact, assigning the password to the Password property in the ConnectionString raises the following error: Run-time Error:
If you try to use a DataList and some labels or text boxes linked to an ADO Data control, and you click on some items in the list, you’ll notice
A file DSN is nothing but a text file that contains all the parameters for an ODBC connection. To prove this, just go to the default directory that holds all
o briefly recap the situation I described in “All the Changes, All the Time: Part I“, my assignment was to capture all the changes being made in one database and,
Here is a little tip to check if any of your .class files are corrupted or if they are not .class files generated from a .java file. There Related Posts
You can connect a MS-Access database to SQL Server as a linked server, and query Access tables in SQL Server’s Query Analyzer. This can help in porting data from Access