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If users are authorized to access the database, you can implement fine-grained data access by granting specific privileges. The Oracle DBMS offers two types of privileges: system privileges and object privileges. System privileges pertain to the right to perform certain (nonobject-related) actions; for example, you can have the CREATE SESSION privilege (allows you to log on to the database) and the CREATE TABLE privilege. Oracle supports approximately 140 different system privileges. Object privileges involve the right to access a specific database object in a specific way; for example, the right to issue SELECT, INSERT, and UPDATE commands against the EMPLOYEES table. Table 2-2 lists the most important Oracle object privileges.
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In the scaffolded application s case, the layout used was app/views/layouts/ entries.html.erb. Let s take a look at it: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="content-type" content="text/html;charset=UTF-8" /> <title>Entries: <%= controller.action_name %></title> <%= stylesheet_link_tag 'scaffold' %> </head> <body> <p style="color: green"><%= flash[:notice] %></p> <%= yield %> </body> </html> This layout includes the basic HTML header and footer items, but also uses some special Rails code to include the name of the current action (from controller.action_name), whatever it might be, in the title of the page. It also uses an ActionPack-supplied helper method called stylesheet_link_tag to include a <link> tag that loads the scaffold.css file from public/stylesheets/scaffold.css for use within the page. The <p style="color: green"><%= flash[:notice] %></p> code renders, if present, the contents of flash[:notice], where flash is a special Rails-supplied data store (somewhat like the session store, but lasting over a single request) that s used for returning messages that arise during controller actions. Placing this code into the layout instead of the view means that messages raised anywhere within your entries controller will display correctly on any page rendered by the entries controller. Last, the <%= yield %> code yields the rendering process to the view for the current action, so the contents of the current view are rendered at that location. The entries layout is automatically used because its filename is entries.html.erb, so views resulting from an entries controller action automatically use it. However, you can force a view to be displayed without a layout by adding a line at the point of render (that is, in the relevant method or action) in the entries controller, like so: render :layout => false For example, let s create an action with a view that s entirely independent of the layout. Within the entries controller, you d add this: def special_method_without_layout render :layout => false end
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630 ChAPTER 11
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If you now run sp_Proc1 in databases other than master, you will observe that all code statements within the stored procedure assume the context of the current database:
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CREATE TRIGGER <trigger name> ON DATABASE FOR <one or more statements or statement groups>
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Although Java has been a threaded language from inception, support for multithreaded programming in the base language has benefited from little innovation in recent years. Furthermore, while significant achievements have been made outside the base language for example, Concurrent Programming in Java, by Doug Lea the base language itself still supports only the lowest available common denominator because of the platform portability requirements of Java Byte-Code. By contrast, Microsoft .NET and the common language runtime (CLR) expose many of the rich threading features available in Microsoft Windows and provide fine-grain control over the thread life cycle. .NET applications can also benefit from the many lessons learned in developing robust multithreaded Java applications, including the techniques discussed in Doug Lea's innovative concurrent programming library, available at http://www.gee.cs.oswego.edu/dl/cpj. With threading, richness equates to complexity, and complexity leads to problems that are difficult to track down and fix. The first part of this chapter will cover the areas where .NET and Java overlap, highlighting the more complex and dangerous features. The second part of this chapter explores the ThreadPool class, which is significantly different from the Java ThreadGroup class. In .NET, this class provides access to a pool of threads that will take work items from a queue, and it can be used to simplify threading for some applications. The remainder of the chapter is given over to synchronization. As with threading, there is commonality between .NET and Java, but closer inspection reveals that .NET provides a more sophisticated and complete approach.
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In this section we re going to look at how you can use just two random standard libraries (net/http and OpenStruct), so that you re prepared for using and working with other libraries in later chapters, where you ll be using many other standard libraries in a similar way. The choice of these two libraries is reasonably arbitrary, although both are commonly used by Rubyists whereas some of the standard libraries get little use at all. A list of all the standard libraries, including documentation, is available at http:// www.ruby-doc.org/stdlib/, although a sizable number of them are covered in more detail in 17 of this book.
0 24 14 You can use pos to set or override the position of the scanner, too: string = StringScanner.new "I want to live to be 100 years old!" string.pos = 12 puts string.scan(/...../)
Listing 2-1: Output from Ildasm.exe that shows metadata for HelloDotNet.exe
router. You can tell if you have the Winsock Proxy Client installed on your com puter by going to Control Panel and looking for the WSP Client icon. If it is present, go into the properties and disable it so that the VPN can operate. When the Winsock Proxy client is active, Winsock API calls such as those used to create tunnels and send tunneled data are intercepted and forwarded to a configured proxy server. Proxy servers are typically used so that private users in an organization can have access to public Internet resources as if they were directly attached to the Internet. VPN connections are typi cally used so that authorized public Internet users can gain access to private organization resources as if they were directly attached to the private network. A single computer can act as a proxy server (for private users) and an answering router (for authorized Internet users) to facilitate both exchanges of information. A proxy server based computer allows an organization to access specific types of Internet resources (typically Web and FTP) without directly connect ing that organization to the Internet. The organization can instead use pri vate IP network IDs (such as 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16).
Ch apt er 3 rUB Y S B U IL DING B L OC K S : Da t a , e X p r e S S I O N S , a N D F LO W C O N t r O L
2. After building the assembly, execute the following line so that you can install it in the GAC, build other assemblies that reference the assembly, and test the assembly. Note that you have to do this only once; it s not necessary to perform this step each time you build your assembly.
Figure 9.12 Different entry levels in a table of contents. Creating or Editing the Introduction Page Part of editing your presentation is to make sure the introduction page of your presentation contains the correct information. If you used the New Presentation Wizard to create the initial presentation, the information you entered on the Presentation Information page appears in the Introduction page area of the Table of Contents tab. The introduction page displays information about your presentation. This page appears while your presentation is loading in your audience s Web browsers. The page is optional; however, by providing information, you can tell your audience about your presentation and its purpose before they begin to watch it. You can click Preview to see the introduction page for the current presentation. Previewing enables you to see the page as it will appear to your audience. After you preview, you can go back and make changes if necessary. For example, if you click Preview and see that the main background color is not the color you like, you could click Presentation
Activate the Focus 2 Formulas worksheet, which is the report module for the Management team . This sheet in the file 1004_SummerCampaign.xlsx is designed for the Full screen presentation view and is protected without a password . The filter options are suppressed, but can be activated without great difficulty . To keep this as a viable option in the future, the data structure as of row 24 corresponds to the filter model that I introduced above . Note Of course, in a real-life scenario, such a module would be protected with a password before it left a company s possession or its developer s hands, so that handling errors could be avoided .
Compute-Bound Asynchronous Operations
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