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As a consequence, criteria queries may return duplicate references to distinct instances of the root entity, even if you don t apply FetchMode.JOIN for a collection in your query. The last query example may return hundreds of Item references, even if you have only a dozen in the database. Remember our discussion in Dynamic fetching strategies with joins, in chapter 14, section 14.3.1 and look again at the SQL statement and resultset in figure 14.3. You can remove the duplicate references in the result List by wrapping it in a LinkedHashSet (a regular HashSet wouldn t keep the order or the query result). In HQL and JPA QL, you can also use the DISTINCT keyword; however, there is no direct equivalent of this in Criteria. This is where the ResultTransformer becomes useful. Applying a result transformer A result transformer can be applied to a query result so that you can filter or marshal the result with your own procedure instead of the Hibernate default behavior. Hibernate s default behavior is a set of default transformers that you can replace and/or customize. All criteria queries return only instances of the root entity, by default:

You can view all network connections configured on a computer in the Network Connections window, which you can access through Control Panel. In the Network Connections window, you can right-click a connection to access a command for working with the connection. These commands include the following:

Viewing the status of a connection Renaming a connection Disabling or enabling a connection Bridging connections Repairing a connection Setting options for a connection

List result = session.createCriteria(Item.class) .setFetchMode("bids", FetchMode.JOIN) .setResultTransformer(Criteria.ROOT_ENTITY) .list(); Set distinctResult = new LinkedHashSet(result);

The New Connection Wizard can configure a network connection for different uses. You can use the wizard to configure a connection for connecting to the Internet, connecting to a private network, setting up a home or small office network, or configuring an advanced connection.

Configuring Dial-Up Connections 15-19

The Criteria.ROOT_ENTITY is the default implementation of the org.hibernate.transform.ResultTransformer interface. The previous query produces the same result, with or without this transformer set. It returns all Item instances and initializes their bids collections. The List probably (depending on the number of Bids for each Item) contains duplicate Item references. Alternatively, you can apply a different transformer:

A dial-up connection connects you to a private network or the Internet by using a device that transfers data over a public telephone network. This device can be a modem that uses a standard phone line, an ISDN card with a high-speed ISDN line, or a DSL modem that requires a dial-up connection. In this lesson, you learn to configure a modem in Windows XP Professional and create a dial-up connection. You also learn to configure Windows XP Professional to allow an incoming connection.

To use the Log On To Windows dialog box (shown in Figure 1-7) to log on locally to a computer running Windows XP Professional, you must supply a valid user name; if the user name is password-protected, you must also supply the password. Windows

List distinctResult = session.createCriteria(Item.class) .setFetchMode("bids", FetchMode.JOIN) .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY) .list();

1-23

XP Professional authenticates the user s identity during the logon process. Only valid users can access resources and data on a computer or a network. Windows XP Professional authenticates users who log on locally to the computer at which they are seated; a domain controller authenticates users who log on to a domain.

Hibernate now filters out duplicate root entity references before returning the result this is effectively the same filtering that occurs in HQL or JPA QL if you use the DISTINCT keyword.

and mundane. As a result, their superiors often have to remind them that when they hear hoof beats, they should think horses, not zebras, meaning that when diagnosing an ailment, they should start with the obvious first. The same is true in computer troubleshooting. For example, if a wired computer fails to connect to the network, do not start by checking the configuration of the network adapter driver; check the simple things first, such as whether the network cable is plugged in.

When a user starts a computer running Windows XP Professional that is configured to use the Log On To Windows dialog box, an Options button also appears. Table 1-1 describes the options in the Log On To Windows dialog box for a computer that is part of a domain.

Table 1-1

Result transformers are also useful if you want to retrieve aliased entities in a join query: