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void UseData() { DataConnection connection1; DataConnection^ connection2 = gcnew DataConnection(); // Use the connection. } int main() { UseData(); // Force a garbage collection, to illustrate a point. GC::Collect(); } Here, we create two connection objects, this time using a SqlConnection. One connection is declared in the function UseData with stack semantics; the other is created with heap semantics. When the UseData function exits, the destructor gets called for connection1, but not for connection2, which becomes an orphaned object. Then, when a garbage collection occurs (in this case artificially forced by the call to GC::Collect, but in principle this could happen at some point in real-world code), an exception is generated. In this case the error reported is
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To some, this section is superfluous there is a performance problem, so surely that is the problem definition! The following quote illustrates why this is not the case. A well-defined problem is a problem half-solved. John Dewey Pressure from users, management, salespeople, and even outside sources can create an intense environment in which the push is for immediate satisfaction. Jumping directly to fixes in this environment may at best keep the situation as is, but could render a worse problem (such as total loss of availability). To be fair, in a few rare cases the appropriate solution was accidentally stumbled upon, but this is not typical. Instead, you must clearly understand the exact nature of the issue you are dealing with, prior to engaging in analysis and resolution. Be prepared to look at the problem laterally. The issue is often obfuscated in any number of ways, such as in erroneous initial preconceptions (that is, guesses). Other redirections commonly occur when secondhand (or thirdhand) descriptions of the problem are taken at face value. You must ascertain an accurate, quantifiable definition of the problem before any useful analysis of data can take place.
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ERROR: ORA-01017: invalid username/password; logon denied Enter user-name: ops$tkyte/something_else@ora11gr2 as sysdba Connected to: Oracle Database 11g Enterprise Edition Release - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options The same process is repeated for any user who was a SYSDBA but is not yet in the password file.
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Creates a TimeSpan that represents the number of days, hours, minutes, and seconds specified by the parameters (in that order). Creates a TimeSpan that represents the number of days, hours, minutes, seconds, and milliseconds specified by the parameters (in that order).
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The EditableRootListBase class is the base from which collections of editable root business objects can be created. This stereotype and base class exist to support a very specific scenario where the list is data bound to a Windows Forms grid control, allowing the user to do in-place editing of the data in the grid. In that data bound grid scenario, when using a dynamic root list, all changes to data on a row in the grid are committed as soon as the user moves off that row. If the user deletes a row, the object is immediately deleted. If the user edits a value and moves up or down to another row, that change is immediately saved. This is fundamentally different from an editable root list, where the user s changes to items in the list aren t committed to the database until the UI saves the entire list. Given a CategoryList object with a collection of CategoryEdit objects, EditableRootListBase will be the base for creating that collection: [Serializable] public class CategoryList : EditableRootListBase<CategoryEdit> { } When creating a subclass, the business developer must provide the specific type of the objects the collection contains. The contained objects should be editable root objects, with one variation. Rather than implementing DataPortal_Fetch(), they will typically implement Child_Fetch() so they can be loaded into memory by the containing collection. Like BusinessListBase, EditableRootListBase inherits from BindingList<T> and so supports all the rich data binding behaviors provided by .NET. A dynamic root list will usually implement only one data access method: DataPortal_Fetch(). Again, this stereotype and base class exist to serve a very specific function; but when dynamic in-place editing of data in a Windows Forms grid is required, this is a very useful approach.
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be exposed to the end user, it makes it easier for accidental bugs or malicious back-door code to creep into your website. This is why I use Session to store the principal object in PTWeb. The user s credentials are validated, and the resulting principal object is placed in a Session field named CslaPrincipal. On all subsequent page requests, this value is retrieved from Session and is used to set both the current Thread and HttpContext object s principals. The work occurs in Global.asax, as this file contains the event handlers for all events leading up to a page being processed. In this case, it is the AcquireRequestState event that is used: protected void Application_AcquireRequestState( object sender, EventArgs e) { System.Security.Principal.IPrincipal principal; try { principal = (System.Security.Principal.IPrincipal) HttpContext.Current.Session["CslaPrincipal"]; } catch { principal = null; } if (principal == null) { // didn't get a principal from Session, so // set it to an unauthenticted PTPrincipal ProjectTracker.Library.Security.PTPrincipal.Logout(); } else { // use the principal from Session Csla.ApplicationContext.User = principal; } } The reason for using the AcquireRequestState event, rather than the more obvious AuthenticateRequest event, is that Session isn t initialized when AuthenticateRequest is raised, but it usually is initialized when AcquireRequestState is raised. The code first attempts to retrieve the principal object from Session. This can result in an exception if Session doesn t exist, and so the value would end up being null. Also, if this is the first page request by the user, the Session field will return null. So the outcome is either a valid PTPrincipal object or null. If the resulting principal value is null, PTPrincipal.Logout() is called to set the current principal as an unauthenticated PTPrincipal, and the HttpContext is set to use that same principal object. This supports the idea of an unauthenticated anonymous guest user. Both the web and business library code have access to valid, if unauthenticated, principal objects, and can apply authorization code as needed. Additionally, by having the current principal be a valid PTPrincipal object, a remote data portal can be invoked and the application server will impersonate the unauthenticated user identity so that code can apply authorization rules as well. On the other hand, if a principal object is retrieved from Session, then that value is set as the current principal.
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The authorization rules behavior in ReadOnlyBase is virtually identical to that in BusinessBase, with the exception that only read operations need to be checked. Since the intent is to create a read-only object, there s no reason to support checking authorization rules for writing to a property. An AuthorizationRules object will be used to manage the roles for each property: <NotUndoable()> _ Private mAuthorizationRules As New Security.AuthorizationRules Protected ReadOnly Property AuthorizationRules() _ As Security.AuthorizationRules Get Return mAuthorizationRules End Get End Property Then the same CanReadProperty() methods are implemented as in BusinessBase. I won t repeat them here, as they are literally the exact same code: three different overloads of the method to support different scenarios. And the primary implementation is an Overridable method, allowing a business developer to alter the authorization behavior if needed.
The templates gcroot and auto_gcroot can also be used in two other scenarios. Just as it is illegal to use tracking handles for data members of native classes, it is also forbidden to define global variables of a tracking handle type. The same restriction applies to static variables of managed functions. The following code shows these restrictions: FileSystemWatcher^ fsw; // error: "global variable may not have managed type" void f() { static FileSystemWatcher^ fsw = gcnew FileSystemWatcher(); // error: "static variable may not have managed type" // ... } In both cases, gcroot can be used to avoid these compiler errors. However, as I explain later, it is not always recommended to use gcroot in these cases.
The EnterpriseServicesPortal class implements IDataPortalServer, and thus the four data methods. As with RemotingPortal, these methods simply delegate the call to a Csla.Server. DataPortal object: Public Function Fetch( _ ByVal criteria As Object, _ ByVal context As Server.DataPortalContext) As Server.DataPortalResult _ Implements Server.IDataPortalServer.Fetch Dim portal As New Server.DataPortal Return portal.Fetch(criteria, context) End Function
f other people have access to your pivot table, you may want to disable some of the features, address privacy concerns, monitor access to protected data sources, or prevent users from making some changes. Some pivot table security settings require programming, and are discussed in 11. Other settings can be made manually, and are explained here. When a pivot table is based on external data, Excel s security settings can affect your ability to update the pivot table. You can change the security settings, to control the security warnings displayed when you connect to the file. The external data source may have a password you d like to store in your Excel file, to make it easier to connect. Pivot tables can summarize large amounts of data, but a few limits exist to what can go into different areas of the pivot table layout. When you re working with very large databases, performance can suffer, and creating or refreshing a pivot table can be extremely slow. This chapter outlines some of the limits and discusses ways to optimize pivot table performance.
The field declarations are as follows: Private Private Private Private Private Private mId As Guid = Guid.NewGuid mName As String = "" mStarted As New SmartDate mEnded As New SmartDate(False) mDescription As String = "" mTimestamp(7) As Byte
The INotifyPropertyChanging interface is almost identical to INotifyPropertyChanged. The only real difference is the timing of when the PropertyChanging event is raised as opposed to the PropertyChanged event. When a property value is about to be changed, the PropertyChanging event is raised first. Then the value is actually changed, and then the PropertyChanged event is raised. The methods in BusinessBase, such as the LoadPropertyValue() method, handle this. That method contains this code: OnPropertyChanging(propertyInfo.Name) FieldManager.SetFieldData(Of P)( _ propertyInfo, newValue) PropertyHasChanged(propertyInfo.Name) You can see the steps here clearly, including how both events are raised I won t walk through the code for INotifyPropertyChanging here, because it is so similar to INotifyPropertyChanged. You can look at the code in BindableBase on your own.
Compiling and running Listing 21-17 produces the information available for the hostname, which is as follows: Hostname: Address: Address: There are no aliases Press enter to finish You can see that the hostname belongs to Akamai, a company that provides content distribution services for high-traffic domains. Note that your results will almost certainly be different because content distribution networks (CDNs) localize their infrastructure to individual internet service providers.
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