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whenever a stored procedure was released, they could have immediately seen two releases of the stored procedure and asked Why within minutes. Our example will demonstrate this in action. You have also seen some system DDL triggers as I mentioned at the start of the chapter with the Declarative Management Framework. They are a great deal more complex than the trigger that will be demonstrated and also interact with Management Studio to show what is happening, but in essence they are the same. First of all, let s look at database scoped events, then toward the end of the section, you will pull the information together in a working example.

We could just have easily supplied the JavaScript directly, as we did with the toggle example, but using the visual_effect helper lets us stick to pure Ruby, instead of dropping down to JavaScript.

data.Add(new GridData() { Name = "John Doe", Age = 30, Male = true }); data.Add(new GridData() { Name = "Jane Doe", Age = 32, Male = false }); data.Add(new GridData() { Name = "Jason Smith", Age = 54, Male = true }); data.Add(new GridData() { Name = "Kayli Jayne", Age = 25, Male = false }); } } } return data;

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This section presents a listing of all the events that can force a DDL trigger to execute. Similar to DML triggers that can execute on one or more actions, a DDL trigger can also be linked to one or more actions. However, a DDL trigger is not linked to a specific table or type of action. Therefore, one trigger could execute on any number of unrelated transactions. For example, the same trigger could fire on a stored procedure being created, a user login being dropped, and a table being altered. I doubt if you will create many, if any, triggers like this, but it is possible. There are two ways that you can create a trap for events that fire. It is possible to either trap these events individually (or as a comma-separated list) or as a catchall. You will see how to do this once we have looked at what events are available.

You ve seen that Rails support for Ajax is comprehensive and fairly simple to use. However, as the complexity of web pages grows with the number of elements that need to be updated due to user interaction, the model we described becomes very complicated and starts to show signs of weakness. To make managing complex Ajax interactions easier, a major feature was introduced (in Rails 1.1): Ruby JavaScript (RJS) templates. RJS templates allow you to express the response to user interactions in pure Ruby code, which is then transformed into JavaScript before being sent to the browser. Unlike conventional templates that are used to render the results of an action, RJS templates generate instructions on how to modify an already rendered page. This approach has the following advantages: You can express yourself using pure Ruby. You can extract Ajax responses from your ERb templates, moving them to a separate file, and making them easier to debug and maintain. You can call any Rails methods and assign them to JavaScript variables.

The next buttons are concerned with executing the code entered in the Query Editor. The red exclamation mark and the Execute button execute the code. The blue tick parses the code but doesn t actually run it. Parsing the code doesn t find every error that could occur, but it ensures that the syntax is correct. The last option is a grayed-out button that turns red when code is executing. If you would like to send a cancel command to SQL Server, then press this button. This may not always cancel the query instantly, depending on what is executing and whether your server is local or remote. There will be a delay in sending the command while SQL Server pauses to receive the command.

Let s go back to one of our earlier Ajax examples and implement it using RJS. When we were experimenting with the ajax controller, we used the form_remote_tag helper to create a new event using Ajax. If you ll recall, we defined callbacks to show and hide a progress indicator while the form was being submitted. Here s what it looked like:

Note When you are binding a collection of data to a DataGrid or ListBox, you may be tempted to use the List generic class. The problem with using the List class is that it does not have built-in change notifications for the collection. In order to bind a DataGrid and ListBox to dynamic data that will be updated, you should use the ObservableCollection generic class. The ObservableCollection class represents a collection of dynamic data that provides built-in notification when items in the collection are added, removed, or refreshed.

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