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The two architectural components shown in Figure 2-1 are the database and the mail server. These are applications in their own right, standing outside your Spring application implementation. I have assumed that the mail server is available to you already. If you can send and receive e-mail, you already have access to one, and I think that is a reasonable assumption for readers of this book. The database is another matter. You may have no database readily available or you may have several. Installing a database (let alone administrating one) can be a complex task in itself, and I have therefore decided to use the HSQL (previously known as Hypersonic) embedded database. This can be used in several modes: Stand-alone as a network-accessible database manager Embedded as an in-memory database Embedded as a flat-file based database The full documentation for the HSQL database can be obtained from the website at http://hsqldb.sourceforge.net. I use the database in only the two embedded modes: in-memory for the benefit of unit tests (so that the database can be repeatedly created and destroyed without affecting subsequent tests) and as a flat-file based database for running the example application. Because I am using the database in embedded mode, I only need to obtain the library files in order to configure the database, and I do this by pulling it in as a Maven dependency (see the Maven section later in this chapter) so you don t need to explicitly download anything! If you want to use another database that s already available to you when running the example application, this is discussed in detail in 4.

For example, the following command can be used to do this: htpasswd -c /etc/apache2/htpasswd linda Next, the command prompts you to enter this user s password twice, and it then creates an entry in the file you specified Of course, a simple hashing algorithm is used to encrypt this password When you add more users to the Apache password file, you won t have to use the -c option again: the file exists and you can just add new users to it The htpasswd command also allows you to remove users from the password file; to do this, use it with the -D option For example, htpasswd -D /etc/apache2/htpasswd stacey removes user stacey from the file Just creating a user isn t enough, however, you have to configure Apache to prompt for a password when a user tries to access restricted data.

You already know how to use the ORDER BY clause, but special rules exist for using the ORDER BY clause in aggregate queries. If a nonaggregate column appears in the ORDER BY clause, it must also appear in the GROUP BY clause, just like the SELECT list. Here is the syntax: SELECT <aggregate function>(<col1>),<col2> FROM <table1> GROUP BY <col2> ORDER BY <col2> Type in the following code to see the error that results when a column included in the ORDER BY clause is missing from the GROUP BY clause: USE AdventureWorks2008; GO SELECT CustomerID,SUM(TotalDue) AS TotalPerCustomer FROM Sales.SalesOrderHeader GROUP BY CustomerID ORDER BY TerritoryID; Figure 5-5 shows the error message that results from running the code. To avoid this error, make sure that you add only those columns to the ORDER BY clause that you intend to be grouping levels.

To do this, some code needs to be included in the directory that you want to protect, as shown in Listing 11-7 Listing 11-7 Protecting a Directory with Basic Authentication <Directory protected> Authtype Basic AuthName "Restricted directory" AuthUserFile /etc/apache2/htpasswd Require user linda </Directory> In this example, the directory protected is protected with a password Because there s no absolute directory path, the directory is relative to the document root of this server Also note that the authentication type Basic is enabled Next, a label is given to this directory with the AuthName "Restricted directory" directive, after which the file containing the user information is declared In the final line, one specific user is granted access to this directory.

package com.apress.timesheets.mail; import import import import import import java.io.InputStream; java.util.*; javax.mail.*; javax.mail.internet.MimeMessage; org.springframework.mail.*; org.springframework.mail.javamail.*;

As an alternative, you can use the option Require user valid-user as well, which is useful if you just want to grant access to any user listed in the password file that you re using..

Figure 5-5. The error message resulting from including a column in the ORDER BY clause that is not a grouping level Listing 5-4 demonstrates how to use the ORDER BY clause within an aggregate query. Be sure to type in and execute the code.