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Listing 8-8. Command-Line Results of count_by_type View {"rows":[ {"key":null,"value":5} ]} That doesn t look right, does it It s simply returning the overall count of the number of documents in the database and not grouping the aggregation based on the key. The reason for this is that you need to explicitly tell the CouchDB API to perform grouping on your view. You did not need to do this in Futon because it does it for you automatically, but using the API, this is a manual process. This time around, issue the following command: cURL -X GET http://127.0.0.1:5984/contacts/_design/contacts/_view/count_by_type group=true This command should result in the code in Listing 8-9 being returned. Listing 8-9. Grouped Results of count_by_type View {"rows":[ {"key":"Both","value":1}, {"key":"Email","value":2}, {"key":"Fax","value":1}, {"key":"Neither","value":1} ]} That's more like it, isn't it As you can see, by passing the group=true query parameter along with your view s URI, you tell CouchDB to group the results by the view s key.

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Script.aculo.us (http://script.aculo.us) is an animation and widget library built on top of Prototype. The Prototype/Script.aculo.us combo is quite popular and is the default in a number of server-side frameworks. Effects can be quickly and easily applied by using a couple lines of code: new Effect.Opacity('myElement', { duration: 2.0, transition: Effect.Transitions.linear, from: 1.0, to: 0.5 }); The class takes the element ID (or the element itself) as the first parameter and an options object literal as the second parameter. This example changes the opacity of an element from 100 percent to 50 percent over 2 seconds. The transition property enables mathematical transitions to be applied to create a more natural feel to the animations. They can start off slow and then speed up. They can start off fast and then slow down. They can even bounce back and forth before settling into place. Script.aculo.us really shines when you use its controls, making it super simple to add them in any project. Here s a sortable list example: Sortable.create("firstlist", {dropOnEmpty:true, containment:["firstlist","secondlist"], constraint:false});

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Figure 10-3. A persistence context consists of a set of entity instances managed by an EntityManager instance. The life cycle of a persistence context depends on its type. As you will learn in the following sections, there are two major types of persistence contexts: container-managed and application-managed. A container-managed persistent context in turn can be either transaction-scoped or extended, depending on whether the context is scoped to a single transaction or might span multiple transactions, respectively. In both cases, though, the life cycle of the persistent context is automatically managed by the Java EE container. In contrast, the life cycle of an application-managed persistence context is explicitly managed by the application.

In EJB components, you will normally use EntityManagers associated with containermanaged persistence contexts. As its name implies, the container manages a containermanaged persistence context. What this means in practice is that it is the responsibility of the Java EE container to manage the life cycle of such a persistence context. The scope of a container-managed persistence context is defined upon creating the EntityManager instance and, by default, corresponds to the scope of an active JTA transaction or can be defined as extended so that it can survive multiple transactions.

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If you come from a relational database background, the easiest way to describe how map/reduce works is to identify the components of a view based on their counterparts in a SQL query implementation. Let s take the following SQL statement: SELECT id, name, email FROM contacts WHERE country = 'USA' ORDER BY name In this SQL statement, you are retrieving the id, name, and email columns from the contacts table. You are filtering the results so that it returns only those rows in the contacts table where the country field is equal to the string value "USA". Finally, you are requesting that the results be returned sorted by the name field. Now let s look at how you would retrieve results from a CouchDB database using a map function (Listing 8-10).

The Sortable control expects to use a list by default and makes each element draggable, which enables each element to be dragged elsewhere in the tree (enabling the user to re-sort the items). You can even enable dragging and dropping between lists. In this example, the control enables elements to be dragged between firstlist and secondlist.

Note A JTA transaction is one that is controlled by the Java EE transaction manager and may include

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