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Using an object literal is the other primary way of creating a new object. It s also dirt simple to do: var customObject = {}; That s it; you now have an object. Extending your object with its own properties and methods is straightforward as well: var customObject = { customProperty: 5, customMethod: function(){ /* using an anonymous function*/ } }; Each property contains a key-colon-value combination, and each declaration is separated by a comma. Key names get converted into strings internally. For the most part, this doesn t matter, but you can actually do some neat things if you know about it. The following is completely valid: var customObject = { "My custom property": 5, 5:6, "5":7 }; Keep in mind that because the keys get converted to strings, the second "5" would actually overwrite the first 5, leaving your customObject["5"] with a value of 7. If you use special characters such as spaces, or if the property name starts with a number, the only way to access those properties is through bracket notation or by looping through all properties using a for..in loop. You can add additional properties onto your object at any time by using dot or bracket notation: customObject.value = 6; customObject["otherValue"] = 7; customObject.newMethod = function(){};

Figure 7-1. An example of a JNDI tree Returning to the task of creating a data source, you start by creating a JDBC connection pool, which you then associate with a JDBC resource. Your application will obtain a database connection from the JDBC connection pool, locating the data source on the JNDI tree and then asking for a connection.

Figure 2-12. Futon Test Suite results Congratulations, you have just successfully built CouchDB and its prerequisite packages from source code. You are now armed with all the tools you need to go forward and start learning how to create CouchDB databases. In the next chapter, you will learn how to install CouchDB on Mac OS X. In 4, you will learn how to create your first CouchDB database.

Figure 7-2 shows a simplified diagram of how a Java EE application interacts with its underlying database.

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Although you ve likely seen some of this before if you ve done any JavaScript programming, I d like to review some of the terminology and touch on some JavaScript concepts that will be important to understand before you get into the rest of the book.

Figure 7-2. A graphical depiction of the structure through which a Java EE application interacts with its underlying database As you can see in Figure 7-2, there are three components between the persistence tier of an application and its underlying database. The upper one, the JNDI naming service, is provided by the application server and, as stated earlier, is used to locate and access the data source associated with the underlying database. Before you can set up a data source, however, you must have the JDBC driver for your database installed in your domain in the application server. The following section will discuss how to obtain and install JDBC drivers for MySQL and Oracle databases.

In this chapter, you will learn how to install the CouchDB database on Mac OS X. There are several ways of installing CouchDB on the Mac. An unofficial one-click package, CouchDBX, is available and provides an easy-to-use way of trying CouchDB, if you don t like to get your hands dirty. I will talk about this in more detail later in this chapter. At the other end of the spectrum is the option to build CouchDB directly from source code. This is quite complicated and is recommended only to power users who want the highest level of flexibility with their CouchDB installation. Thankfully, there s a happy medium that offers relative simplicity in terms of installation while allowing you a high level of control in the configuration of your CouchDB setup. This method is what I refer to as the MacPorts method. Before you can install CouchDB using MacPorts, you need to take care of a few dependency issues. First, you need to install Apple s Xcode developer tools. You can install the tools from your Mac OS X installation CDs/DVD, or alternatively you can download them from the Apple Developer Connection web site. Then you need to install MacPorts, an excellent open source package manager for Mac OS X. Once you have these dependency issues sorted out, installing CouchDB is a piece of cake.

JDBC is a standard way for Java applications to connect and then interact with relational databases. The JDBC drivers implement the standard java.sql interfaces and can also implement vendor-specific interfaces.

Functions are a series of commands wrapped into one call. Functions enable you to encapsulate code into discrete tasks and enable you to reuse them in different ways (this will be at the core of 3 when object-oriented programming with JavaScript is covered). For example: function foo(){ } // this is a function Functions can also be anonymous. This means they don t have a name. They re like spirits in the wind. An example is as follows: function (){ } // this is an anonymous function

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