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< xml version="1.0" encoding="UTF-8" > <persistence xmlns="" xmlns:xsi="" xsi:schemaLocation="" version="2.0"> <persistence-unit name="tempdb"> <jta-data-source>java:/DefaultDS</jta-data-source> <properties> <property name="" value="create-drop"/> <!-You can enable this for Hibernate to dump SQL output to STDOUT <property name="hibernate.show_sql" value="true"/> --> </properties> </persistence-unit> </persistence>
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The persistence.xml deployment descriptor defines the identities and configuration properties of each persistence unit described within it. Each persistence unit must have an identity, although the empty string is a valid name. The set of classes that belong to the persistence unit can be specified, or you can opt for the persistence provider to scan the JAR file automatically for the set of classes to deploy as entities. When scanning is used, the persistence provider will look at every class file within the JAR to determine whether it is annotated with the @javax.persistence.Entity annotation, and if it is, it will add it to the set of entities that must be mapped. Each persistence unit is tied to one and only one data source. In Java SE environments, vendor-specific configuration must be used to define and configure these data sources. In Java EE environments, specific XML elements define this association. The root of the persistence.xml XML schema is the <persistence> element, which contains one or more <persistence-unit> elements. Each <persistence-unit> has two attributes: name (required) and transaction-type (optional). The subelements of <persistence-unit> are <description> (optional), <provider> (optional), <jta-datasource> (optional), <non-jta-data-source> (optional), <mapping-file> (optional), <jarfile> (optional), <class> (optional), <properties> (optional), and <exclude-unlistedclasses> (optional). Here s an example of a persistence.xml file:
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@PersistenceContext(unitName = "actionBazaar") private EntityManager entityManager;
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Before describing how we can do this, we should observe that it is possible to configure Tomcat to treat a directory tree as a WAR file and to poll for updated JSP and .class pages, dynamically updating a running application. If this works for your project, then Ant can just use <copy> to create the appropriate directory structure and Tomcat will pick up the changes automatically. Be warned, however, that sometimes behavior can be unpredictable when you change parts of the system. A full deployment is cleaner and more reliable, even if it takes slightly longer. 7.5.1 The Tomcat management servlet API Tomcat 4.x lets you perform a hot update on a running server. That is, without restarting the web server you can remove a running instance of your application and upload a new version, which is ideal for busy servers or simply fast turnaround development cycles. The secret to doing this is to use the web interface that the server provides for local or remote management. This management interface exports a number of commands, all described in the Tomcat documentation. Table 7.5 lists the commands that HTTP clients can issue as GET requests. Most commands take a path as a parameter; this is the path to the web application under the root of the server, not a physical path on the disk. The install command also takes a URL to content, which is of major importance to us.
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In chapter 9 we showed you how to group entities as a persistence unit and how to configure that unit using persistence.xml. Now that you know how to package entities, it s time to learn more about persistence.xml, the descriptor that transforms any JAR module into a persistence module. It s worth mentioning that persistence.xml is the only mandatory deployment descriptor that you have to deal with. We hope the Java EE specification will ease this requirement in future releases of the specification. At the time of this writing, some EJB containers such as Oracle and JBoss support proprietary extensions of persistence modules without persistence.xml in EJB -JAR modules. Although user-friendly, this feature will not be portable across EJB 3 containers. You can find the schema for persistence.xml online at http:// Listing 11.6 is an example of a simple persistence.xml that we can use with the ActionBazaar application; it should successfully deploy to any Java EE 5 container that supports JPA. The first thing the file does is define a persistence unit and package it to your deployment archive for example, WAR or EJB -JAR.
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for (int i = 0; i < SCORE_CACHE_SIZE; i++) scoreCache[i] = getSimilarity() .tf(i) * weightValue; } public float score() { int f = freqs[pointer];
public void manipulatePdf(String src, String dest, int pow) throws IOException, DocumentException { Gets original PdfReader reader = new PdfReader(src); page size Rectangle pageSize = reader.getPageSize(1); Rectangle newSize = (pow % 2) == 0 new Rectangle( Sets page size of pageSize.getWidth(), pageSize.getHeight()) : new document new Rectangle( pageSize.getHeight(), pageSize.getWidth()); Rectangle unitSize = new Rectangle( pageSize.getWidth(), pageSize.getHeight()); for (int i = 0; i < pow; i++) { Calculates page size of unit unitSize = new Rectangle( unitSize.getHeight() / 2, unitSize.getWidth()); } int n = (int)Math.pow(2, pow); Calculates int r = (int)Math.pow(2, pow / 2); helper variables int c = n / r; Document document = new Document(newSize, 0, 0, 0, 0); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(String.format(dest, n)));; PdfContentByte cb = writer.getDirectContent(); PdfImportedPage page; Rectangle currentSize; float offsetX, offsetY, factor; int total = reader.getNumberOfPages(); for (int i = 0; i < total; ) { if (i % n == 0) { document.newPage(); } currentSize = reader.getPageSize(++i); factor = Math.min( Calculates unitSize.getWidth() / currentSize.getWidth(), scale factor unitSize.getHeight() / currentSize.getHeight()); offsetX = unitSize.getWidth() * ((i % n) % c) +(unitSize.getWidth() - (currentSize.getWidth() * factor))/2f; Calculates offsetY = newSize.getHeight() offset - (unitSize.getHeight() * (((i % n) / c) + 1)) + (unitSize.getHeight() - (currentSize.getHeight() * factor))/2f; page = writer.getImportedPage(reader, i); Scales and cb.addTemplate(page, positions page factor, 0, 0, factor, offsetX, offsetY); } document.close(); }
ITEMS table primary key NUMBER VARCHAR2(255) CATEGORIES table
The many-to-one relationship works essentially like the property tag, except that it stores a foreign key to another table, as opposed to a single column property value. As such, it shares many of the same
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Figure 13.2 Using named functions in the debug version of a script file lets you display a more informative stack trace.
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