visual basic barcode program Figure 2-6. Outer join simplification in .NET

Implement qr codes in .NET Figure 2-6. Outer join simplification

Case Scenario Exercise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60
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SQL Server allows you to specify hints in your queries to force certain behavior . The three categories of hints are table, join, and query . Query hints are specified in an OPTION clause at the end of the query and indicate certain behavior at the whole query, or statement, level . Earlier in the chapter I covered a few query hints: OPTIMIZE FOR, RECOMPILE, and KEEPFIXED PLAN . SQL Server supports many others, and you can find details about those in SQL Server Books Online . Before proceeding I should also mention the usual disclaimer regarding hints . You should use them with care, because a hint forces SQL Server to behave in a certain way, overriding its default behavior in that respect . Especially with performance hints such as forcing certain join ordering (FORCE ORDER), certain join algorithm ({LOOP | MERGE | HASH} JOIN), and so on, you force that part of optimization to become static . With respect to the part of optimization that you forced, you prevent dynamic cost-based optimization that would have normally taken place, and that would have taken into consideration data distribution and other changes . Assuming that you know what you re doing and that you have your reasons to use a query hint, adding such a hint requires you to change the query s code . You need to add the OPTION clause with the relevant hint . However, changing a query s code is not always an option . For example, the code might be submitted from a third-party application, or your service-level agreements may prevent you from making revisions even if you technically could make them . SQL Server 2008 supports a feature called plan guides that allows you to attach a query hint to a query without changing the query s code . A plan guide is an object in the database; as such, as soon as it is created and until it is dropped or disabled, it affects the query it is associated with . You create a plan guide by using the sp_create_plan_guide stored procedure . You drop or disable a plan guide by using the sp_control_plan_guide procedure . SQL Server supports three types of plan guides, and you indicate the type of plan you want to create using the sp_create_plan_guide procedure under the @type parameter, whose valid values are N OBJECT , N SQL , and N TEMPLATE . You should use the type OBJECT when the statement appears in the context of a T-SQL routine such as a stored procedure . You should use the type SQL when the statement appears in the context of a stand-alone statement or batch . Finally, use the type TEMPLATE when you want to override the database s parameterization behavior for a certain class of statements . You need ALTER permission on the referenced object to create an object plan guide, and ALTER permissions on the database to create a SQL or template plan guide . The next sections provide details about the three plan guide types .
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By invoking these constructors and methods, a developer using any programming language can convert an Int32 or a Single object to a Rational object and convert a Rational object to an Int32 or a Single object . The ability to do these conversions can be quite handy, and when designing a type, you should seriously consider what conversion constructors and methods make sense for your type . In the previous section, I discussed how some programming languages offer operator overloading . Well, some programming languages (such as C#) also offer conversion operator overloading . Conversion operators are methods that convert an object from one type to another type . You define a conversion operator method by using special syntax . The CLR specification mandates that conversion overload methods be public and static methods . In addition, C# (and many other languages) requires that either the parameter or the return type must be the same as the type that the conversion method is defined within . The reason for this restriction is that it enables the C# compiler to search for a possible operator method to bind to in a reasonable amount of time . The following code adds four conversion operator methods to the Rational type:
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If you wanted your computer to talk to another computer, that communication would take place over a modem or hardwired connection. There simply were no other options. Telecommuting was virtually unknown because of lack of connectivity options and bandwidth resources.
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Table 4-6. Customers from Spain that Made Orders
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UNDER THE HOOD
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Role management consists of a set of classes and interfaces that establish roles for the current user and manage role information. In ASP.NET user management, roles function as user groups, enabling you to assign access rights to all users who are part of a specific role. The most useful of these classes is System.Web.Security.Roles, which provides the ability to add users to or remove users from roles, create new roles, and determine to which roles a user belongs. The Roles class provides many static methods, including the following:
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DECLARE @From_LSN binary(10); SET @From_LSN = sys.fn_cdc_get_min_lsn('dbo_Employees'); DECLARE @To_LSN binary(10); SET @To_LSN = sys.fn_cdc_get_max_lsn(); SELECT * FROM cdc.fn_cdc_get_all_changes_dbo_Employees (@From_LSN,@To_LSN,'all'); SELECT * FROM cdc.fn_cdc_get_net_changes_dbo_Employees (@From_LSN,@To_LSN,'all'); GO
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A useful feature provided by Rails applications out of the box is support for sessions. When a web browser makes a request to your application, Rails silently sends back a cookie containing a unique identifier for that browser. Whenever that browser makes further requests, it sends back the cookie with the unique identifier, so the application always knows when a certain previous visitor is making another request. You can use the session s ability to store information that s specific to a particular visitor for use on future requests. Sessions are commonly used on web sites for features such as shopping carts or keeping track of what pages you ve visited. For example, if you add an item to your cart at an e-commerce site, the item chosen is stored in a data store associated with your session s ID. When you come to check out, your session ID is used to look up data specific to your session in the session system s data store and find out what you have in your cart. To demonstrate basic session storage in your Rails application, you ll count and show a user how many times he or she has accessed actions within your application. To do this, you need to have some way of performing this logic on each request made to the application. You could add logic to every controller action, but an easier way is to use a filter method called before_filter. before_filter is a method you can use at the controller class level to define that a method (or, indeed, many methods) should be executed before the method for the controller action of the current request. Filters make it possible to perform generic activities before every request (or before requests to certain groups of methods or certain controllers).
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16 Service Broker
APPENDIX A CREATING AND USING EXCEL LISTS
COMMENTS -----------------------------------------------------------SUBSTRING -----------------------------------------------------------Project (half a month) for the ACCOUNTING department (half a month)
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After you configure your queues, you can start adding items to queues. The two main methods for adding items to a queue are:
n n n
As described earlier, just because the user has access to the network via VPN, that does not mean that the user should have access to every resource on the network while accessing from an unsecured location. Remote access policies that define authorization and connection constraints can be used to specify a set of IP packet filters that are applied per user or group to remote access connections. When the connection is accepted, the packet filters define the types of IP traffic that are allowed from and to the VPN client. This feature can be used for extranet connections. An extranet is a portion of your organization network that is accessible to users outside the organization, such as business partners and vendors. By using remote access policy profile packet filtering, you can create a remote access policy that specifies that members of the Partners group can only access the Web servers at specific IP addresses or on a specific subnet. This feature can also be used to prevent VPN remote access clients from sending packets that they did not originate. When the remote access client computer makes the VPN connection, by default it creates a default route so that all traffic that matches the default route is sent over the VPN connection. If other computers are forwarding traffic to the remote access VPN client, treating the remote access client computer as a router, then that traffic will also be forwarded across the VPN connection. This is a security problem because the VPN server has not authenticated the computer that is forwarding traffic to the remote access VPN client. The computer forwarding traffic to the remote access VPN client computer has the same network access as the authenticated remote access VPN client computer. To prevent the VPN server from receiving traffic across the VPN connection for computers other than authenticated remote access VPN client computers, configure remote access policy packet filters on the remote access policy that is used for your VPN connections. The default remote access policy for Windows Server 2003 named Connections To Microsoft Routing And Remote Access Server already has the correct input packet filters for this configuration. Note Although this is the default setting for the VPN server to apply filters for all individual remote users, this can make the IP filter list quite huge in a largescale environment, thus potentially causing a performance hit. If you are seeing performance degrade when going into the thousands of users per gateway, make sure to use Quarantine to check to make sure the client s routing bits are disabled, thus blocking the client from acting as a router, and then disable the individual IP filters and see if this improves performance.
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