A typical example is the logical business compared to cubes, product dimensions, time dimensions, position dimensions, respectively, as different axes. The intersection of axes is a detailed fact. This fact table is a table of intersection points of multiple dimensions. A dimension table is a form of factual analysis.First, the star structure in the database structure is introduced, which maintains the data in a single fact table in the center of the structure, and other dimension data is stored
This article mainly summarizes the definitions of common headers in PHP, which are very comprehensive and meticulous. For more information, see. The header () function sends the original HTTP header to the client.
It is important to realize that the header () function must be called before any actual output is sent (in PHP 4 and later versions, you can use the output cache to solve this problem):
The above is all the content of this article. I ho
First go to an article
Article :
I also encountered this problem when I was a beginner at windows SDK programming. I believe many beginners of Windows programming have also encountered this problem. Later, I gradually understood this problem, but sometimes I am not quite clear about it when asked by others. Today, I would like to take this opportunity to organize my own ideas and explain this question in detail in the following article, hoping to help my friends who have this question.
Un
The WCF development tool brings us great benefits. Its powerful functional advantages make it a very important position in the development field. Here we will introduce in detail the definitions and implementation methods of WCF program transactions, hoping to help you.
A WCF program transaction is defined as follows:
[ServiceContract(SessionModeSessionMode=SessionMode.Required)]
publicinterfaceIComplexService
{
[OperationContract]
[TransactionFl
It is okay to use MFC in the shared library for the project. The following problem occurs when you use MFC in a static library.
1> msvcrtd. lib (ti_inst.obj): error LNK2005: "private: _ thiscall type_info: type_info (class type_info const )"(?? 0type_info @ AAE @ ABV0 @ Z) has been defined in libcmtd. lib (typinfo. obj)
1> msvcrtd. lib (ti_inst.obj): error LNK2005: "private: class type_info _ thiscall type_info: operator = (class type_info const )"(?? 4type_info @ AAEAAV0 @ ABV0 @ Z) has been
The following are some important macro definitions. record them as follows:
Assert assertions:
# Define assert (Cond )? (Void) 0: _ assert (# cond ,__ file __,__ line __))
Void _ assert (char * cond, char * filename, long lineno)
{
Printf ("assert: % s in file: % s, at line: % d \ n", Cond, filename, lineno );
}
Obtains the offset of the fields in the struct.
# Define offsetof (type, field) (INT) (char *) (type *) 0)-> F)-(char *) (type *) 0
Common definitions of different interfaces for notebook LCD screens (20Needle, 30Needle, d6l, d8l, S6l)
Generally, machines with a screen larger than 600e are not defined as follows:
20pin single 6 definition: 1: Power Supply 2: Power Supply 3: Ground 4: Ground 5: R0-6: R0 + 7: ground 8: R1-9: R1 + 10: location 11: R2-12: r2 + 13: Location 14: CLK-15: CLK + 16 blank 17 blank 18 blank 19 blank 20 empty each group of signal lines between the resistance
[Enet Silicon Valley Power News] on December 31, June 26 (Beijing Time on December 31, June 27), many anti-spyware programs will clear data tracking files that are left on the hard drive of computers after users access the Internet, that is, cookies.
Microsoft's Anti-Spyware does not have such a function. In the industry, there are disagreements about whether to clear advertising programs to clear spyware. The industry has different opinions on what is spyware, what is advertising software, and
Declaration. The value is nil.
Local variables:
We can define local variables in functions or methods (including processes). Local variables are allocated on the Application Stack and always allocated on the stack! The memory of local variables is in the function or method (inclusion process)Allocated when called. The memory is released when the function or method (including process) Call ends. Because the top of the stack may change every time a function or method (including a process) is call
Definitions and features of secure cloud services
Cloud computing technology is applied to the network security field, network security capabilities and resources are cloudified, and on-demand network security services are provided to customers through the Internet, thus realizing a brand new network security service model, this security service model is often referred to as security as a service (SAAS. To avoid confusion with software as a service (S
So far, we have met two strange definitions of typedef, so we decided to take notes for future use.
[Const pointer of typedef]
[Case]
Typedef string * pstr;
Const pstr cpstr;
What kind of pointer is cpstr in the above Code?
[Analysis]
Many of my friends, including myself, first reflected that cpstr was defined as a common pointer pointing to the const string object for a simple reason, replace string * And pstr.
// This is obviously a normal pointer t
Access_log log file and definitions of ip, uv, and pv, access_loguv
Accesslog is a log generated by apache, nginx, and other web services. It corresponds to each request of a webpage and contains a large amount of information, after analyzing the accesslog, you can have a general understanding of the website's operation. In case of a problem, you can also roughly locate the problem by analyzing the accesslog data. Engineers responsible for website O
Hadoop-definitions of Computer Network PortsPort Introduction
The ports described in this article are all logical ports, which refer to the ports in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port 21 for the FTP service.
Here we will introduce the logical port.A. Distribution by port number (1) Well-Known Ports)
A well-known port is a well-known port number ranging from 0 to 1023. The
defined:
Let's first explain "provflags". In the source code of Delphi, we can find that it actually corresponds to the tfield attribute providerflags, so 7 is easy to understand.
See the definitions of tproviderflag and tproviderflags.
TProviderFlag = (pfInUpdate, pfInWhere, pfInKey, pfHidden); TProviderFlags = set of TProviderFlag;
Since it is a set, 7 is obviously an integer representation of a set: If it is arranged in order, 7 is actually a
Pin definitions for RS-232 male Headers
For the interface, the order is as follows:
DB9 master/pass: 54321 DB9 public/needle: 12345
98766789
1. RS-232 end (DB9 master/pass) PIN DefinitionPin No. 2 3 5 1, 4, 6, 7, 8Signal definition txd rxd internal connectionNote: This port can be directly inserted into the COM port of the computer.
2. RS-232 end (DB9 head/needle) PIN DefinitionPin No. 2 3 5 1, 4, 6, 7, 8Signal definition rxd txd internal
struct. Struct { Int Aaa ;} Mystruct1 ; // The most common method is clear and self-evident. my_struct_tag is the struct tag, and my_struct_type is the alias of struct my_struct_tag. Typedef struct My_struct_tag { Int Aaa ;} My_struct_type ; // The writing methods of the following two definitions are acceptable. Of course, the method of using typedef definition is more concise. My_struct_type mystruct2 ; // Define the variable through the st
definition.
If a already exists in other files in the program, this proves that the program has allocated memory for a. In this case, it is much easier to use. You only need to tell the program that this a has been defined elsewhere, so you write extern int;
For int A;, it is both a definition and a declaration; for extern int A;, It is a declaration, not a definition. Generally, the bucket creation declaration is defined to facilitate the description, rather than the bucket creation declar
What does cpa cps cpc mean?
There seems to be some way to add advertisements.
CPA (cost-per-Action): the cost of each action, that is, the pricing model based on the actions each visitor takes on online advertising. There are special definitions of user actions, including forming a transaction, obtaining a registered user, or clicking on an online advertisement.
CPC (cost-per-click): the cost of each click. Fees are charged based on the number of
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