mcafee definitions

DML (data manipulation Language) Manipulation language:Scope of application: The data in the database to do some simple operations, such as Insert,delete,update,select.DDL (data definition Language) Definition language:Scope of application: Manage certain objects in the database (for example, database,table), such as Create,alter and drop.Difference:The 1.DML operation is the ability to manually control the opening, committing, and rollback of transactions.2.DDL operation is implicitly committed

known member variable PTR, minus its relative offset of 4 in the struct to the address of the struct (ptr-4).In Linux there is a good macro to use, called container_of, placed in the Linux/kernel.h . It is defined as follows:#define OFFSETOF (Type, MEMBER) ((size_t) ((TYPE *) 0)->member)Note: The input of this macro definition is the type of struct, a member variable of the struct body.Macro function: Gets the offset of a struct variable member in this struct body. 1. ((TYPE *) 0) transforms 0

/****yy_room*2015-3-6***/#include Common uses in macro definitions

transformation.Matrix elimination Element Method:determinant TypeCalculation (0 descending order method)Other properties of the determinant:The law of ClydeMatrixFollow the law1. Linear Properties2. Operational and polynomial of n-order matricesElementary matrix and its role in multiplicationFor the unit matrix, the matrix obtained by making an elementary transformation becomes the elementary matrix.Together there are three primary transformations:The block rule of multiplication:Two frequently

1, first to an example#define Addr 0x2330000#define DATA (* (uint32_t *) addr)The call is as follows:1;2. If two or more parameters are added, the conditional operator is as follows:#define Addr0 0x2330000#define addr1 0x2330004#define DATA (n) ((n==0)? ( * (uint32_t *) addr0):(* (uint32_t *) ADDR1))What would it be like to call again as before?DATA (01;D ata (11;Result compilation failed, hint: expression must be a modifiable lvalue (the expression must be a modifi

data with a reference type (reference type) does not reside in the stack, but is stored in the heap. That is, allocating memory space in the heap,Instead of storing the contained value directly, you point to the value you want to store, and its value represents the address that you are pointing to. When you access a reference type that has aData, you need to check the contents of the variable into the stack, which references an actual data in the heap. Data with reference type data ratio typeTh

In Scala, there are two ways to support higher-order objects.1. Type parameters: Trait Dataops[a] { def show (a:a) = println (A) } val numbericops = new dataops[int]{}There is a generic a on the trait that can be filled in when instantiating a type2. Delay definition to subclassTrait Dataops { Type a def show (a:a) = println (A)}val numbericops = new Dataops { override type A = Int}Generics are not defined on the trait, but need to be defined in the subclass for type a specific typesBot

= "hyperlink Address"Target= "_blank">Hyperlink texta>--Open in a new window can also be found in the current page of the directory click on the directory hyperlink, automatically jump to a place where the page. Table:Table>Table>table width: wide. Can be expressed in pixels or percentages.　　Commonly used 960 pixels.　　Border: Border, common value is 0.　　CellPadding: The distance between the content and the border, with a common value of 0.　　cellspacing: The spacing between cells and cells, with

POSIX IPC uses the IPC name as the IPC identifier. Mq_open Sem_open Shm_open The first parameter of three functions is the name, which is not necessarily the name that exists in the file system. To use an IPC object, you need to create or open it, similar to a file operation, mainly using the Mq_open, Sem_open, Shm_open functions. When you create or open an IPC object, you need to specify the mode of the operation, such as O_ronly, O_wronly, O_rdwr, O_creat, O_EXCL, and so on, and the IPC objec

to const1) const pointer: pointer is const,For example: int * const x;Indicates that the pointer cannot be modified and cannot point to other objects, but the value of the address pointed to by the pointer can be modified;2) pointer to const: pointer to const objectFor example: const int *x;OR: int const *x;Indicates that the pointer can point to another object, but the value of the current object that the pointer refers to cannot be modified.2. Function pointers and function return pointers1)

Three definitions of PHP strings: single quotes, double quotes, delimiters 1, and single quotes: the simplest way to specify a simple string is to use single quotes (character '). In a string enclosed by single quotes, to represent a single quotation mark, you must use a backslash (\) to escape it. it is the same as many other languages. If there is a backslash before single quotes or at the end of a string, PHP strings must be defined in three ways.

for collection data Structures set-max-intset-entries 512# #有关有序集合数据结构的配置项zset-max-ziplist-entries 128zset-max-ziplist-value 64## Configuration items for Hyperloglog byte limit hll-sparse-max-bytes 3000# #关于是否需要再哈希的配置项activerehashing yes##About the control of client output buffering client-output-buffer-limit normal 0 0 0client-output-buffer-limit slave 256mb 64MB 60client-output-buffer-limit pubsub 32mb 8mb 60# #有关频率的配置项hz 10# #有关重写aof的配置项aof-rewrite-incremental-fsync YesThis article is from t

the language. Understanding: The Interpreter mode is to use "mini language" to express the problem of the program to solve, in the mini-language written "mini-program" to express specific problems. 29. Visitor Pattern: definition: Represents an operation that acts on elements of an object structure. It allows you to define new actions that act on these elements without changing the class of each element. Understanding: The ability is limited, the pattern is not understood temporarily. The above

MFC Technical Instructions: In MFCSDK switch method to process Windows messages, By message ing table(Message map) and virtual function polymorphism to process the specified form message 1. Declare a message ing table(Message map) Add a macro to the class that can process messages Declare_message_map () Note: MFC has a more detailed system overview. Here we only introduce several macro definitions. This macro provides three functions. : 1. Pr

Judging IOS7 or above version#define Isios7plus ([[[Uidevice Currentdevice] systemversion] floatvalue] >= 7.0? Yes:no)Determine iphone model greater than 5#define Isiphone5plus ([UIScreen instancesrespondtoselector: @selector (currentmode)]? Cgsizeequaltosize (Cgsizemake (640, 1136), [[UIScreen Mainscreen] currentmode].size): NO)Determine iphone model greater than 6#define Isiphone6plus ([UIScreen instancesrespondtoselector: @selector (currentmode)]? Cgsizeequaltosize (Cgsizemake, 1334), [[UIScr

+1,..., An)The table ai-1 ahead of Ai,ai in Ai+1, called Ai-1 is the direct precursor of AI, Ai+1 is the direct successor element of AI. When i=1,2,3,... n-1, Ai has and has only one direct successor, and when i=2,3,..., N, Ai has and only one direct precursor.Method 1: Insert all data elements that are in linear table lb but not in LAAssuming that two linear tables, LA and LB, represent two sets a and B respectively (that is, the data element in the linear table is a member of the collection),

name of two wildcard characters, then you need to look at this configuration who is in front of it, and it matches the one written in the previousFor example, one action name is "*_*" and one is "user_*", and now there is a request for "user_add.action". Then it will first match the action written in front of it.(3) Any action with "*" name priority is the same, not that the priority with a "*" is higher than with two "*".Summary: So we should put the Acton configuration with the most wildcard

independence, making the program maintenance and modification easier. Modifications to the application are limited to the inside of the class, so you can minimize the impact of application modification.Polymorphism:Polymorphism refers to allowing objects of different classes to respond to the same message. For example the same addition, adding two time together and adding two integers together must be completely different. For example, the same choice of edit-paste operation, in the word proces

1, problem descriptionA constant is declared with a preprocessing directive #define to indicate how many seconds are in 1 years.2. Answer#define Seconds_per_year (365*24*60*60ul)3, analysis1) #define cannot end with a semicolon, note adding parentheses2) The preprocessor computes the value of the constant expression and writes out how to calculate it is more meaningful than writing the calculated value directly3) The value of this expression exceeds the 16-bit binary expression range, it is bett

conditions (price, trade).The reference value of a market analysis report is not only reflected in the above two aspects, but also to a considerable extent reflected in this sideFace. In some cases, it is even more direct to inspire, induce and elicit service objects (leaders, operators and producers).Of interest, association and decision-making. The existence of this aspect is the market Analysis report high quality, high value, higher level, completeThe embodiment of sex. Therefore, it is ver