SPQuery examples SharePoint 2010 Client Object model

Some examples how can use SPquery or caml query in SharePoint 2010 Client Object model.

var site;
var context;
var list;
var collListItem;

context = new SP.ClientContext.get_current();
site = context.get_web();
context.load(site);

list = site.get_lists().getByTitle(‘MyList’);
context.load(list);

var camlQuery = new SP.CamlQuery();
camlQuery.set_viewXml(‘‘);
collListItem = list.getItems(camlQuery);
context.load(collListItem);

context.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}

function onQuerySucceeded(sender, args) {

alert(“Request succeeded. ” + args.Message + “\n” + args.StackTrace);
}

function onQueryFailed(sender, args) {

alert(“Request failed. ” + args.Message + “\n” + args.StackTrace);

}