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N ote You may need to change the connection string that is passed to the Northwind constructor in Listing 1-3 for the connection to be properly made. Read the section on DataContext() and [Your]DataContext() in 16 to see different ways to connect to the database.

Running the previous code by pressing Ctrl+F5 outputs the following data to the console window: Hanari Carnes Que Del cia Ricardo Adocicados This simple example demonstrates querying the Customers table of the Northwind database for customers in Rio de Janeiro. Although it may appear that there is nothing new or special going on here that we wouldn t already have with existing means, there are some significant differences. Most noticeably, this query is integrated into the language, and this means we get language-level support that includes syntax checking and IntelliSense. Gone are the days of writing a SQL query into a string and not detecting a syntax error until runtime. Want to make your where clause dependent on a field in the Customers table but cannot remember the name of the field IntelliSense will show the table s fields to you. Once you type in c. in the previous example, IntelliSense will display all the fields of the Customers table to you. All the previous queries use the query expression syntax. You will learn in 2 that two syntaxes are available for LINQ queries, of which the query expression syntax is one. Of course, you can always use the standard dot notation syntax that you are accustomed to seeing in C# instead. This syntax is the normal object.method() invocation pattern you have always been using.

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A database connection is represented in JDBC by an instance of the Connection class, and as you might expect, an instance of that class is returned by DriverManager s getConnection() methods. The following code segment loads an Oracle driver (which will register itself with the DriverManager) and then obtains a database connection: Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@oraserver:1521:projava"; Connection connect = DriverManager.getConnection(url, "bspell", "brett");

As the Microsoft NET platform and its supporting languages C# and VB have matured, it has become apparent that one of the more troublesome areas still remaining for developers is that of accessing data from different data sources In particular, database access and XML manipulation are often cumbersome at best and problematic at worst The database problems are numerous First, there is the issue that we cannot programmatically interact with a database at the native language level This means syntax errors often go undetected until runtime Incorrectly referenced database fields are not detected either This can be disastrous, especially if this occurs during the execution of error-handling code Nothing is more frustrating than having an entire error-handling mechanism fail because of syntactically invalid code that has never been tested Sometimes this is unavoidable because of unanticipated error behavior.

The panes to the right of the command buttons and drop-down give access to more detailed information regarding script execution and debugging events, such as the console and call stack.

Obtaining Connections from a DataSource (2.x Optional Package)

Having database code that is not validated at compile time can certainly lead to this problem A second problem is the nuisance caused by the differing data types utilized by a particular data domain, such as database or XML data types versus the native language in which the program is written In particular, dates and times can be quite a hassle XML parsing, iterating, and manipulation can be quite tedious Often an XML fragment is all that is desired, but because of the W3C DOM XML API, an XmlDocument must be created just to perform various operations on the XML fragment Rather than just add more classes and methods to address these deficiencies in a piecemeal fashion, the development team at Microsoft decided to go one step further by abstracting the fundamentals of data query from these particular data domains The result was LINQ.

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