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Note As you saw in 1, you can also return data using a DataAdapter to populate a DataSet. The DataReader is the easier method of accessing the database, and we ll concentrate on it in this chapter. In 5, we ll look at the differences between the DataReader and the DataSet, and in 6, we ll start using the DataAdapter and DataSet objects to query the database.

notifyUser : function() { alert('The image was clicked'); } }; So far so good. The image element is set as the first argument to the constructor, and the onclick event is observed on it. But wait, I haven t implemented the handleClick() method, which is called by the event observer. I ll add it to the class: ImageHandler = Class.create(); ImageHandler.prototype = { initialize : function(img) { $(img).observe('click', handleClick); }, notifyUser : function() { alert('The image was clicked'); }, handleClick : function(e) { this.notifyUser(); } };

if (productVariable1 == productVariable2) { // This is true if both productVariable1 and productVariable2 // point to the same thing. // This is false if they are separate, yet identical, objects. }

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As you ll see, not all queries to a database produce a set of results. You can write queries that only return single values, most commonly when returning the result from a scalar function, and we ll spend some time looking at scalar functions and how you can use the ExecuteScalar() method to retrieve these values from the database. You can also write queries that don t return any results at all. Any INSERT, UPDATE, or DELETE queries that you execute against the database won t return any results. You use a third method, ExecuteNonQuery(), to execute those queries. You ll see how to use ExecuteNonQuery() in 8.

s Note This rule has a special exception. When classes override the == operator, they can change what

The event handler function is now there But will it be called when the image is clicked No the observer will call the global handleClick() function, not the handleClick() method inside the ImageHandler class I need to add this in front of the handleClick() call: initialize : function(img) { $(img)observe('click', thishandleClick); }, There s one small problem with this The correct function will now be called when the image is clicked, but it will be called from the event-handling part of the system In the handleClick() function, I refer to thisnotifyUser() Unfortunately, calling this here will not refer to the current instance of ImageHandler This is where bind() comes in I must bind the event-handler function to the current object Rather than using thishandleClick as the event handler, I actually need to use thishandleClickbind(this), as follows: ImageHandler = Classcreate(); ImageHandler.

type of comparison it performs. The only significant example of this technique in .NET is the String class. For more information, read the sidebar Would the Real Reference Types Please Stand Up later in this chapter.

As you saw in 1, the data provider for a particular data source contains implementations of several objects. Each of these objects handles a specific task, and a Connection object, unsurprisingly, handles a connection to a data source. The Connection object (as was the case with traditional ADO) is the basis for all interactions with the data source you want to use. You must open the connection before you access the data source, and you must close it when you re finished.

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