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So far, you have seen how to query the database using LINQ syntax and entities. Entities can be used to do other operations on the database, such as insert new records, update records, and delete existing records. Using the LINQ to SQL framework, these operations will be executed by the DataContext class automatically. In fact, the DataContext class uses a change-tracking feature that allows it to track every difference between data originally retrieved by a query and the current version of that data as modified by your code. For example, if your code adds a new region by instantiating a new Region object and assigning it to the derived DataContext class s Regions collection, the change-tracking feature understands that a new record has been added and composes the related SQL statement to insert it into the database. The actual insert is accomplished when the code invokes the SubmitChanges method. Here is an example: AdventureWorksDataContext db = new AdventureWorksDataContext(); CountryRegion newRegion = new CountryRegion(); newRegion.CountryRegionCode = "ZZ"; newRegion.Name = "New Region from Code"; newRegion.ModifiedDate = DateTime.Now; db.CountryRegions.InsertOnSubmit(newRegion); db.Log = Console.Out; db.SubmitChanges(); The InsertOnSubmit method defined in each entity allows you to add a new object to the related collection. Internally, the InsertOnSubmit method informs the change-tracking feature to compose the INSERT SQL instruction. So, when SubmitChanges is called, the SQL statement is built and executed, as shown in Figure 18-10, and the database is updated, as shown in Figure 18-11.

To create the page, you need to create a new instance of the CMS_Content_Item_Page class and populate it with the values from the page form. Since you also have one file field, you need to download he file (the page image) and then set the image property in the page object to the path to the image that was uploaded. Listing 6-7 shows the updated createAction() method. Listing 6-7. The Updated Page Controller createAction() in application/controllers/PageController.php public function createAction() { $pageForm = new Form_PageForm(); if($this->getRequest()->isPost()) { if($pageForm->isValid($_POST)) { // create a new page item $itemPage = new CMS_Content_Item_Page(); $itemPage->name = $pageForm->getValue('name'); $itemPage->headline = $pageForm->getValue('headline'); $itemPage->description = $pageForm->getValue('description'); $itemPage->content = $pageForm->getValue('content'); // upload the image if($pageForm->image->isUploaded()){ $pageForm->image->receive(); $itemPage->image = '/images/upload/' . basename($pageForm->image->getFileName()); } // save the content item $itemPage->save(); return $this->_forward('list'); } } $pageForm->setAction('/page/create'); $this->view->form = $pageForm; }

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Once you have done this, the wizard will complete and attempt to set up your mirroring configuration. Figure 4-6 shows the updated mirroring settings in the Database Properties dialog box once the wizard has completed.

## parse command line options while getopts c:v var do case "$var" in c) config_file=$OPTARG ;; v) verbose=1 ;; esac done shift $(( $OPTIND - 1 )) ## configure the current session config || exit 1 ## disconnect and perhaps do other chores when finished trap cleanup EXIT ## create directory for headers set_dirs || cleanup 5 printf "\n%s\n" "${datestamp//./:}" >> "$summary_file" ## connect and log in connect || exit $ [ $verbose -ge 1 ] && printf "Connected to %s as %s\n" $server $user >&2 ## get number of messages from server popcmd stat || exit 4 num_messages=${num:-0} [ $verbose -ge 1 ] && printf "Number of messages on server: %d\n" $num_messages >&2 case $num_messages in 1) printf " 1 message\n" ;; *) printf " %${#num_messages}d messages\n" $num_messages [ $num_messages -eq 0 ] && exit ;; esac >> "$summary_file" getsizes || printf "%s\n" "Problem retrieving message sizes" >&2 [ $verbose -ge 1 ] && printf "Retrieved message sizes\n" >&2 [ $verbose -ge 1 ] && printf "Retrieving headers\n" >&2 getheaders || cleanup 6

Figure 4-6. Mirroring settings in the Database Properties dialog box after running the Configure Database Mirroring Security Wizard Once the wizard has completed, you ll need to perform some manual steps before you can click the Start Mirroring button in the Database Properties dialog box. You ll need to manually back up and restore your database from the principal to the mirror. Once you ve restored the database with the NO RECOVERY option, you can click the Start Mirroring button. Management Studio will attempt to start database mirroring using the same commands you saw earlier to manually set up your mirror pair. Figure 4-7 shows a successfully started database mirroring session in Management Studio.

Figure 4-7. A successfully running mirror being monitored in Management Studio The Mirroring section of the Database Properties dialog box will show the current state of the mirroring. You can also get a quick view of the role and status via Object Explorer, as shown in Figure 4-8.

[ $verbose -ge 1 ] && printf "Headers retrieved\n" >&2 [ $verbose -ge 1 ] && printf "Checking whitelist\n" >&2 allow || cleanup 6 filter || cleanup 7

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