This version of the code adds a boolean variable , 這個版本的代碼添加了一個布爾變量
If you require a boolean variable that can also have a value of 值的布爾型變量,請使用
Nullable booleans are similar to the boolean variable type used in sql 可空布爾值類似于sql中使用的布爾變量類型。為了確保
For an example of when you might use a nullable type , consider how an ordinary boolean variable can have two values : true and false 有關可能使用可空類型的示例,請考慮普通的布爾變量如何能夠具有兩個值: true和false 。
For example , c treats boolean variables as single - byte values , while the common language runtime marshals them as four - byte values to match the boolean type defined by the microsoft win32 api 例如, c + +將布爾變量視為單字節值,而公共語言運行庫將它們作為四字節值進行封送以匹配microsoft win32 api定義的
Whose state contains boolean variables representing the right to do different things , such as permission to call into unmanaged code , each of which is either allowed or not 是這種類型權限的一個示例,其狀態包含一些布爾型變量,這些變量表示執行不同操作的權限(如調用非托管代碼的權限) ,每一權限或者被允許,或者不被允許。
This part put forward the system conception of kdd and the apriori algorithm . then evolved the create - frequent - set algorithm which was fit for the freight agent management system . because of the shortage of efficiency , 1 improved the algorithm . because some of the items were not boolean variables , 1 need the quantitaitve attributes association rules discovering algorithm . in general , there had the levels among the items , so multilevel association rules existed . after perfecting the algorithmic need interpret and evaluate the knowledge . in the end , 1 discussed the privacy and security of kdd . the fifth part described the future problems and prospect 第四章是論文的主體,著重介紹知識發現的全過程,按照semma方法論首先進行數據準備,然后進入數據挖掘階段,提出知識發現的概念體系和公認的apriori算法,從該算法演變出適合于貨代管理系統的生成頻繁項目集的算法;因為在實際應用中存在效率上的不足,因此進一步地提出了改進方案;在事務處理中各個項目并不都是布爾型變量,因此需要特定的針對多值屬性的關聯規則發現算法;通常情況下,項目之間存在有層次關系,因此多層次關聯規則的發現普遍存在;算法完善并運行后需要對發現的知識進行解釋和評估;本章的最后討論了知識發現的私有性和安全性問題;第五章講述有待解決的問題和發展前景。
Initializes a new instance of the mutex class with a boolean value that indicates whether the calling thread should have initial ownership of the mutex , a string that is the name of the mutex , a boolean variable that , when the method returns , indicates whether the calling thread was granted initial ownership of the mutex , and the access control security to be applied to the named mutex 使用一個指示調用線程是否應擁有互斥體的初始所屬權的布爾值、一個作為互斥體名稱的字符串、一個在方法返回時指示調用線程是否被授予互斥體的初始所屬權的布爾變量、以及要應用于已命名的互斥體的訪問控制安全性來初始化
Class , specifying whether the wait handle is initially signaled if created as a result of this call , whether it resets automatically or manually , the name of a system synchronization event , and a boolean variable whose value after the call indicates whether the named system event was created 類的新實例,并指定在此調用后創建的等待句柄最初是否處于終止狀態,它是自動重置還是手動重置,系統同步事件的名稱,以及一個boolean變量(其值在調用后表示是否創建了已命名的系統事件) 。
Class , specifying whether the wait handle is initially signaled if created as a result of this call , whether it resets automatically or manually , the name of a system synchronization event , a boolean variable whose value after the call indicates whether the named system event was created , and the access control security to be applied to the named event if it is created 類的新實例,并指定在此調用后創建的等待句柄最初是否處于終止狀態,它是自動重置還是手動重置,系統同步事件的名稱,一個boolean變量(其值在調用后表示是否創建了已命名的系統事件) ,以及應用于已命名的事件(如果創建了該事件)的訪問控制安全性。