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To list all employees, even those who haven t taken any orders, enter the following SQL into SSMSE and execute it. You should see the results as in Figure 11-18.

Note Connection pools help ensure for more robust operation, by providing for reuse of connections while ensuring the connections are in fact valid. Often naive code will hold a connection for a very long time, to avoid the overhead of creating a connection, and then go to the trouble of managing reconnecting in the event of a network or server failure. It's better to let that be managed by the connection pool infrastructure instead of reinventing it.

employees e left outer join orders o on e.employeeid = o.employeeid order by 2, 1

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for(int j = 0; j < mm.getCount(); j++) { final BodyPart bp = mm.getBodyPart(j); if( partType(bp,"text/html")) { messageTextSent = true; } else if( partType(bp,"image/jpeg")) { messageInlineImageSent = true; } } } else if( partType(part,"image/jpeg")) { messageAttachmentSent = true; } } assertTrue(messageTextSent); assertTrue(messageInlineImageSent); assertTrue(messageAttachmentSent); } Here the complexity of extracting and verifying image data is severe enough that I have settled for checking that the expected components of the message are present though they may be corrupted. Again, we will make the test more complex only if we have reason to believe that there is a problem with the transmitted content. For now, we presume that the external libraries operate as specified. As you have now seen, the creation of mock objects can itself be a moderately complicated procedure. Sometimes it is unavoidable. For many cases, however, there are simpler options. We can generate mock implementations automatically, or we can use mock implementations provided with the libraries. In the next couple of sections, you will see both of these approaches.

Had you used an inner join you would have missed the row for the new employee. (Try it for yourself.) The only new SQL in the FROM clause is the join operator itself:

All transactions, if supported, are done within the context of a connection. We will be discussing transactions further in the subsection on data modification, but Listing 12-6 is the basic recipe. Listing 12-6. Transaction Recipe try: # Obtain a connection that is not using auto-commit (default for zxJDBC) conn = zxJDBC.connect(jdbc_url, username, password, driver) # Perform all work on connection do_something(conn) # After all work is complete, commit conn.commit() except:

You also added an ORDER BY clause, to sort the result set by first name within last name, to see that the kind of join has no effect on the rest of the query, and to see an alternate way to specify columns: by position number within the select list rather than by name. This technique is convenient (and might be the only way to do it for columns that are produced by expressions; for example, by the SUM function).

# If a failure occurs along the way, rollback all previous work conn.rollback()

The service layer usually provides a thin veneer of functionality between the presentation layer and the various DAO implementations. There may be additional business logic, but its outputs are based purely on parameters passed in and obtained from calls to DAO methods. Listing 10-23 shows part of our implementation of the UserAccountService interface.

order by 2, 1

In a managed container, you would use zxJDBC.lookup instead of zxJDBC.connect. If you have code that needs to run both inside and outside containers, we recommend you use a factory to abstract this. Inside a container, like an app server, you should use JDNI to allocate the resource. Generally the connection will be managed by a connection pool (see Listing 12-7). Listing 12-7. factory = "com.sun.jndi.fscontext.RefFSContextFactory" db = zxJDBC.lookup('jdbc/postgresDS', INITIAL_CONTEXT_FACTORY=factory) This example assumes that the datasource defined in the container is named jdbc/postgresDS, and it uses the Sun FileSystem JNDI reference implementation. This lookup process does not require knowing the JDBC URL or the driver factory class. These aspects, as well as possibly the user name and password, are configured by the administrator of the container using tools specific to that container. Most often by convention you will find that JNDI names typically resemble a jdbc/NAME format.

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