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You can also give the complete destination file name, which renames the file during the copy:

The object/relational paradigm mismatch can be broken into several parts, which we ll examine one at a time. Let s start our exploration with a simple example that is problem free. As we build on it, you ll begin to see the mismatch appear. Suppose you have to design and implement an online e-commerce application. In this application, you need a class to represent information about a user of the system, and another class to represent information about the user s billing details, as shown in figure 1.1. In this diagram, you can see that a User has many BillingDetails. You can navigate the relationship between the classes in both directions. The classes representing these entities may be extremely simple:

public class User { private String username; private String name; private String address; private Set billingDetails; // Accessor methods (getter/setter), business methods, etc. ... } public class BillingDetails { private String accountNumber; private String accountName; private String accountType; private User user; // Accessor methods (getter/setter), business methods, etc. ... } Figure 1.1 A simple UML class diagram of the User and BillingDetails entities

The task performs bulk copies when you specify a fileset inside the copy task; you must also specify the destination directory with the todir attribute and omit the tofile attribute:

Note that we re only interested in the state of the entities with regard to persistence, so we ve omitted the implementation of property accessors and business methods (such as getUsername() or billAuction()). It s easy to come up with a good SQL schema design for this case:

<copy todir="${dist.bin.dir}"> <fileset dir="src/scripts" > <include name="**/*.*"/> </fileset> </copy>

create table USERS ( USERNAME varchar(15) not null primary key, NAME varchar(50) not null, ADDRESS varchar(100) ) create table BILLING_DETAILS ( ACCOUNT_NUMBER varchar(10) not null primary key, ACCOUNT_NAME varchar(50) not null, ACCOUNT_TYPE varchar(2) not null, USERNAME varchar(15) foreign key references user )

Be aware that <copy> is timestamp-aware by default; sometimes that can catch you out. One of the authors used Ant to install a web application off a CD onto a server, but one system wouldn t upgrade because the CD file was older than the dates of the file installed on the server. A build file that had worked for months suddenly broke. The solution to such a problem is to set overwrite="true", which tells Ant to overwrite the file regardless of timestamp differences. Another point to note is <copy> gives the file a timestamp of the current time. You can request that the date of the original file is propagated to the new file, by setting preservelastmodified="true". This may be useful, even though we have not used it ourselves. If you want to change the names of files when copying or moving them, or change the directory layout as you do so, you can specify a <mapper> as a nested element of the task. We introduced mappers in chapter 3; packaging is one of the times where you may want to make use of them. 6.1.3 How to move files To move files around, use the <move> task. It first tries to rename the file or directory; if this fails then it copies the files and deletes the originals. Note that this is a change in Ant 1.5; previous versions always copied files, even when a rename was possible. The syntax of this task is nearly identical to <copy>, as it is a direct subclass of the <copy> task, so any of the examples listed in section 6.1.2 can be renamed and used to move files: