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The ScrollMode constants of the Hibernate API are equivalent to the constants in plain JDBC. In this case, the constant ensures that your cursor can only move forward. This may be required as a precaution; some JDBC drivers don t support scrolling backward. Other available modes are ScrollMode.SCROLL_INSENSITIVE and ScrollMode.SCROLL_SENSITIVE. An insensitive cursor won t expose you to modified data while the cursor is open (effectively guaranteeing that no dirty reads, unrepeatable reads, or phantom reads can slip into your resultset). On the other hand, a sensitive cursor exposes newly committed data and committed modifications to you while you work on your resultset. Note that the Hibernate persistence context cache still provides repeatable read for entity instances, so only modified scalar values you project in the resultset can be affected by this setting. So far, the code examples we ve shown all embed query string literals in Java code. This isn t unreasonable for simple queries, but once you begin considering complex queries that must be split over multiple lines, this gets a bit unwieldy.

By default, client computers running Windows 95 and later are configured to obtain TCP/IP configuration information automatically. Automatic TCP/IP information is provided on a network using a DHCP server. When a client computer starts, it sends a broadcast message to the network looking for a DHCP server that can provide IP

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We don t like to see HQL or JPA QL string literals scattered all over the Java code, unless really necessary. Hibernate lets you externalize query strings to the mapping metadata, a technique that is called named queries. This lets you store all que-

addressing information. Typically, most computers on a network should be configured to obtain IP addresses automatically because automatic addressing eliminates most of the errors and administrative overhead associated with assigning static IP addresses to clients. However, even in a DHCP-enabled environment, you should assign a static IP address to selected network computers. For example, the computer running the DHCP Service cannot be a DHCP client, so it must have a static IP address. If the DHCP Service is not available, you can also configure TCP/IP to use a static IP address. For each network adapter card that uses TCP/IP in a computer, you can configure an IP address, subnet mask, and default gateway, as shown in Figure 13-2.

Figure 13-2

ries related to a particular persistent class (or a set of classes) encapsulated with the other metadata of that class in an XML mapping file. Or, if you use annotations, you can create named queries as metadata of a particular entity class or put them into an XML deployment descriptor. The name of the query is used to call it from application code. Calling a named query In Hibernate, the getNamedQuery() method obtains a Query instance for a named query:

Table 13-3

Description A logical 32-bit address that identifies a TCP/IP host. Each network adapter card in a computer running TCP/IP requires a unique IP address. Subnets divide a large network into multiple physical networks connected with routers. A subnet mask blocks out part of the IP address so that TCP/IP can distinguish the network ID from the host ID. When TCP/IP hosts try to communicate, the subnet mask determines whether the destination host is on a local or remote network. To communicate on a local network, computers must have the same subnet mask.

session.getNamedQuery("findItemsByDescription") .setString("desc", description);

Default gateway The router (also known as a gateway) on the local network. The router is responsible for forwarding traffic to and from remote networks.

When you create an RDP file on Workstation A that launches the Event Viewer console and send it via e-mail to a user on Workstation B, which computer's events appear in the console when the user on Workstation B runs the file

To configure TCP/IP to use a static IP address, complete the following steps: 1. Click Start, and then click Control Panel.

In this example, you call the named query findItemsByDescription and bind a string argument to the named parameter desc. Java Persistence also supports named queries:

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em.createNamedQuery("findItemsByDescription") .setParameter("desc", description);