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Force.com Cookbook Sample Code
Chapter 13: Getting Started with Visualforce - Using AJAX in a Visualforce Page

To download all the code samples, access the Cookbook. -

public class contactController {

	// Return a list of the ten most recently modified contacts
	public List<Contact> getContacts() {
		return [SELECT Id, Name, Account.Name, Phone, Email FROM Contact ORDER BY LastModifiedDate DESC LIMIT 10];
	}

	// Get the 'id' query parameter from the URL of the page.
	// If it's not specified, return an empty contact.
	// Otherwise, issue a SOQL query to return the contact from the
	// database.
	public Contact getContact() {
		Id id = System.currentPageReference().getParameters().get('id');
		return id == null ? new Contact() : [SELECT Id, Name FROM Contact WHERE Id = :id];
	}
}

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