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CouchDB is designed to allow bidirectional replication in an efficient and reliable manner. It does this through an incremental replication model, where only those documents that have changed since the last replication are processed. By design, CouchDB s replication system allows a failed replication process to pick up from the last saved checkpoint. In addition to regular CouchDB documents that store data, the design documents that house CouchDB views are also replicated, as well as any document s attachments. This means that entire CouchDB applications can enjoy the benefits of this replication feature, not just the data. Let s take a look at how to perform replication in CouchDB. The first method is using Futon, the web-based administration interface that comes with every CouchDB installation. Open your web browser, and visit the URL http://127.0.0.1:5984/_utils (assuming CouchDB is installed on your local computer). In Futon, create two databases one called futon-one and the other called futon-two. In the futon-one database, create three documents (you don t need to worry about creating any fields because the aim is merely to get replication working). When viewing Futon s Overview page, you should see your two databases, similar to Figure 12-1. Note that futon-one has three documents and futon-two has zero documents.

To edit a contact, first select it in the contacts list and tap it to open its Info page. There, tap the Edit button in the top-right corner. This sends you to an edit screen that is functionally nearly identical to the New Contact screen (Figure 9-5). Make your changes, and then tap Done to finish and save them. A Delete Contact button appears at the bottom of the edit screen. To remove a contact from your address book, scroll down to the red button and tap it. A confirmation dialog appears. Tap Delete Contact again, and Contacts removes the item from your address book. Tap Cancel to retain the contact.

{ firstName: "John", lastName: "Doe" }

Figure 12-1. The futon-one and futon-two databases Now, in the main menu of Futon on the right side, click the Replicator link to navigate to the Futon replication tool. This page should look like the one shown in Figure 12-2.

iPhone s Calculator app provides a very basic interactive calculator with a simple memory. The icon on your home screen looks like four calculator buttons. It appears on the second row of the home screen, the second icon in. You can see this icon in Figure 9-1. Tap it to open the application, as shown in Figure 9-7.

In JavaScript, both the objects have the same structure. However, the second object isn t a valid JSON representation, because the names of the properties aren t enclosed in double quotes. Restrictions also apply to JSON arrays, where elements must be supported values. For example, a Date object isn t in the list of supported values and therefore can t be an element of a JSON array or a property of a JSON object. A String has the same representation as a JavaScript string literal, except that strings must always be enclosed in double quotes. Numbers are similar to JavaScript number literals, but octal and hexadecimal formats aren t supported. Here is an example of a JSON array:

Figure 12-2. Futon replication tool At the top of this page you will see two sides, one with the heading Replicate changes from and the other with the heading to. Under each you will see two options Local database and Remote database. For this example, you will be replicating your local database futon-one to another local database, futon-two. Make sure that under Replicate changes from, the Local database option is selected and that the futon-one database is selected. Ensure that under to that Local database is also selected but that here the futon-two database is selected. When you are ready to replicate the database, click the Replicate button. The replication process will start and should finish almost immediately, because the database is very small. When it is done, you will see a message in the Event area like the one shown in Figure 12-3.

Figure 9-7. The iPhone Calculator application allows you to use your iPhone as a calculator when you re on the go. It lacks advanced features, but its basic functionality usually does the job, whether you re splitting a check or keeping track of the amount you ve spent so far in the supermarket.

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