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Tables are the fundamental components of a relational database In fact, both data and relationships are stored simply as data in tables Tables are composed of rows and columns Each column represents a piece of information Mapping cardinalities, or cardinality ratios, express the number of entities to which another entity can be associated via a relationship set Cardinality refers to the uniqueness of data values contained in a particular column of a database table The term relational database refers to the fact that different tables quite often contain related data For example, one sales rep in a company may take many orders, which were placed by many customers The products ordered may come from different suppliers, and chances are that each supplier can supply more than one product.

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All of these relationships exist in almost every database and can be classified as follows: One-to-One (1:1) For each row in Table A, there is at most only one related row in Table B, and vice versa This relationship is typically used to separate data by frequency of use to optimally organize data physically For example, one department can have only one department head One-to-Many (1:M) For each row in Table A, there can be zero or more related rows in Table B, but for each row in Table B, there is at most one row in Table A This is the most common relationship An example of a one-to-many relationship of tables in Northwind is shown in Figure 3-1.

Note As Singleton objects will be accessed by multiple threads at the same time, it s important that you

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Note the Customers table has a CustomerID field as the primary key (indicated by the key symbol on the left), which has a relation with the CustomerID field of the Orders table; CustomerID is considered a foreign key in the Orders table The link shown between the Customers and Orders tables indicates a one-to-many relationship, as many orders can belong to one customer Here, Customers is referred to as the parent table, and Orders is the child table in the relationship..

Now you re ready to test your implementation so far. Just as you did for your Extras integration, from the phone s Start screen, select the Pictures hub on your phone, pick any picture collection, and select an individual picture of your choice. Click the ellipsis ( ) at the bottom of the screen, and select Share. You should see Upload to PhotoCapture as one of the options that come up. Clicking that option should start the application and load the selected photo into the Image control the behavior we expect. Now you re ready to upload the photos to TwitPic, which is the primary hosting service for photos destined for Twitter, the hottest social media network today. Silverlight in general and Silverlight on Windows Phone 7 in particular differ from other applications in the fact that they rigorously enforce a non-blocking user interface principle: everything, including communications over the network, must happen asynchronously. TwitPic cloud service provides a RESTful API that allows programmers to send messages to that service as long as we conform to the expected message format.

Web applications are applications built on the technology that powers the Web. The HTTP protocol and the associated programming paradigm are a prominent part of this technology set. In Java, the raw lowlevel HTTP and related infrastructure is abstracted out as a higher-level API and managed components. At the heart of this abstraction is the Servlet specification, which wraps HTTP methods and HTTP protocol handling in objects. Web applications written in Java are packaged with all assets, associated libraries, class files, and any other resources into a special archive file format: a web application archive (WAR). These WAR files are deployed on a servlet container or an application server (which contains a servlet container). Most data services, especially LCDS and BlazeDS, are web applications and exist as WAR files. The remoting gateway is a servlet, and data service elements are web components. A little later, in the section

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