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The net effect of these changes is that our classes API is now visible on the web application, under the path antbook/api. 12.5.2 Creating new files We want to put a build status file up on the web site, too, so we can browse straight to a system and see what version is running there:

Isn t <one-to-one> used for primary key associations Usually, a <one-toone> mapping is a primary key relationship between two entities, when rows in both entity tables share the same primary key value. However, by using a formula with a property-ref, you can apply it to a foreign key relationship. In the example shown in this section, you could replace the <one-to-one> element with <many-to-one>, and it would still work.

The interesting part is the <one-to-one> mapping and how it relies on a property-ref and literal formula values as a join condition when you work with the association. Working with the association The full SQL query for retrieval of an auction item and its successful bid looks like this:

<target name="make-build-properties" depends="init" > <property name="buildprops.filename" value="build.properties"/> <property name="buildprops.path" location="${build.dir}/${buildprops.filename}"/>

select i.ITEM_ID, i.INITIAL_PRICE, ... b.BID_ID, b.AMOUNT, b.SUCCESSFUL, b.BIDDER_ID, ... from ITEM i left outer join BID b on 'T' = b.SUCCESSFUL and i.ITEM_ID = b.ITEM_ID where i.ITEM_ID =

<propertyfile comment="Build Information" file="${buildprops.path}"> <entry key="build.date" type="date" pattern="EEEE MMM dd, yyyy" value="now"/> <entry key="build.time" type="date" pattern="kk:mm:ss" value="now"/> <entry key="build.timestamp" type="date" pattern="yyyy-MM-dd'T'HH:mm:ss" value="now"/> <entry key="build.user.name" value="${user.name}"/> <entry key="build.counter" operation="+" value="1" default="1" type="int"/> </propertyfile> </target>

When you load an Item, Hibernate now joins a row from the BID table by applying a join condition that involves the columns of the successfulReference property. Because this is a grouped property, you can declare individual expressions for each of the columns involved, in the right order. The first one, 'T', is a literal, as you can see from the quotes. Hibernate now includes 'T' = SUCCESSFUL in the join condition when it tries to find out whether there is a successful row in the BID table. The second expression isn t a literal but a column name (no quotes).

Running this creates a property file such as the following:

Hence, another join condition is appended: i.ITEM_ID = b.ITEM_ID. You can expand this and add more join conditions if you need additional restrictions. Note that an outer join is generated because the item in question may not have a successful bid, so NULL is returned for each b.* column. You can now call anItem.getSuccessfulBid() to get a reference to the successful bid (or null if none exists). Finally, with or without database constraints, you can t just implement an item.setSuccessfulBid() method that only sets the value on a private field in the Item instance. You have to implement a small procedure in this setter method that takes care of this special relationship and the flag property on the bids:

#Build Information #Sat Mar 16 11:54:58 PST 2002 build.time=11\:54\:58 build.user.name=slo build.date=Saturday Mar 16, 2002 build.timestamp=2002-03-16T11\:54\:58 build.counter=31

public class Item { ... private Bid successfulBid; private Set<Bid> bids = new HashSet<Bid>(); public Bid getSuccessfulBid() { return successfulBid; } public void setSuccessfulBid(Bid successfulBid) { if (successfulBid != null) { for (Bid bid : bids) bid.setSuccessful(false); successfulBid.setSuccessful(true); this.successfulBid = successfulBid; } } }

When setSuccessfulBid() is called, you set all bids to not successful. Doing so may trigger the loading of the collection a price you have to pay with this strategy. Then, the new successful bid is marked and set as an instance variable. Setting the flag updates the SUCCESSFUL column in the BID table when you save the objects. To complete this (and to fix the legacy schema), your database-level constraints need to do the same as this method. (We ll come back to constraints later in this chapter.) One of the things to remember about this literal join condition mapping is that it can be applied in many other situations, not only for successful or default relationships. Whenever you need some arbitrary join condition appended to your queries, a formula is the right choice. For example, you could use it in a