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The technique just described for obtaining a database connection is easy to use, but it does have one drawback Since you must load a driver and construct a driver- and database-specific URL, this approach causes your application to be tightly coupled to a specific driver and database Although there are ways to address those weaknesses, no standard solution was defined until JDBC 2x, when the DataSource interface was introduced as part of the optional package A DataSource is simply a class that provides a layer of abstraction between your application and the information needed to connect to a database That information may include the identity of the Driver class, the information needed to construct a valid URL, and a user ID and password Like DriverManager, DataSource provides getConnection() methods that can be used to obtain database connections.

LINQ is Microsoft s technology to provide a language-level support mechanism for querying data of all types These types include inmemory arrays and collections, databases, XML documents, and more..

The Source pane, shown in Figure 5 31, displays syntax-highlighted contents of each file containing script loaded in the current page. Developers can switch between files using the Script list in the main Script tab UI. Beyond viewing source, the pane is used to set, modify, and remove breakpoints for running script.

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Now assuming you have created a syntactically correct query expression, the next issue becomes how the compiler translates the query expression into C# code. It must translate your query expression into the standard C# dot notation that we discuss in the query expression section. But how does it do this To translate a query expression, the compiler is looking for code patterns in the query expression that need to be translated. The compiler will perform several translation steps in a specific order to translate the query expression into standard C# dot notation. Each translation step is looking for one or more related code patterns. The compiler must repeatedly translate all occurrences of the code patterns for that translation step in the query expression before moving on to the next translation step. Likewise, each step operates on the assumption that the query has had the code patterns for all previous translation steps translated.

As of this writing, most DataSource implementations aren t in widespread use, but the JavaSoft documentation suggests that a DataSource will most commonly be accessed through the Java Naming and Directory Interface (JNDI) JNDI is an API that defines methods used to associate names with resources and provide access to those resources through a directory In this case, the resource would be a DataSource that s able to obtain a connection to a particular database; the following is an example of how JNDI and the DataSource might be used: Context ctx = new InitialContext(); DataSource source = (DataSource)(ctxlookup("jdbc/projava")); Connection connect = sourcegetConnection(); With this approach, your application code is coupled only to the name assigned to the database (projava) instead of a particular driver and URL.

Some translations insert enumeration variables with transparent identifiers. In the translation step descriptions in the next section, a transparent identifier is identified with an asterisk (*). This should not be confused with the SQL-selected field wildcard character, *. When translating query expressions, sometimes additional enumerations are generated by the compiler, and transparent identifiers are used to enumerate through them. The transparent identifiers exist only during the translation process, and once the query expression is fully translated, no transparent identifiers will remain in the query.

In fact, this technique allows both the driver and the information used to connect to the database to be modified without requiring any changes to your source code Although DataSource is described in the DriverManager API documentation as the preferred means of connecting to a data source, DataSource implementations are currently rare If one isn t provided for you with the driver you re using, your only options are to continue to use DriverManager for obtaining connections or to create your own DataSource implementation Since DriverManager isn t deprecated, it s still appropriate to use that class, and in many cases this will be the easiest approach However, you can create a DataSource like the one.

Next we discuss the translation steps. In doing so, we use the variable letters shown in Table 2-1 to represent specific portions of the query.

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