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The Hibernate Query Language abstracts queries from the underlying database. While the language is similar to SQL, HQL is object oriented and has features to support querying object graphs. There are two common methods used to execute an HQL statement. The Session interface provides an overloaded find method that can execute queries and return the results. The Query interface also offers the ability to execute queries, but it provides more fine-grained control of the query, such as limiting the number of returned objects. Both the Query and Session interfaces allow results to be returned as a List or as an Iterator. The key difference between the two is that the Iterator actually retrieves objects when the next() method is called. When a List is returned, all of the contained objects are populated when the query is executed. Like JDBC PreparedStatements, HQL queries can take positional parameters, denoted with a question mark. However, HQL also supports the concept of named parameters. The Criteria class is used to create queries programmatically. It s handy when you don t know what the exact query will be, as in an
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XML is rapidly becoming a language that most Java projects have to work with in one way or another. It hosts the configuration data for so much of Java, describing everything from web applications to the downloadable files of a client-side program deployed with Java Web Start. Nor can we forget Ant s build file format itself. XML can find many more places in a large project, which means that Ant needs to work with it. XML can act as a structured file format for programs to use as source of input or configuration data: build files are an example of this use. XML can also be the output format of an application; this output can be fed into another program that uses the same format. XML can work as a marshalling format for data in a remote procedure call; XML-RPC, SOAP and SOAP + Attachments are all examples of this. One powerful use of XML is as a presentation-independent representation of documents; from a single XML document, you can generate HTML, PDF, and bitmap representations of the text. All these examples are not merely theoretical uses of XML; they are some of the things you may wish to do with XML during a build process. Ant provides the basic set of tasks to enable many of these actions in a build. First, it can validate the XML, verifying that it is well formed and matches a DTD or other schema. Second, it can transform XML, by using XSLT transformations or simple text file filtering. The third way that Ant can work with XML is that a custom task can 317
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<option value="3">Northern</option> <option value="4">Southern</option> </select>
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textMatchSpan.onmouseover = this.mouseoverHandler.bindAsEventListener(this); textMatchSpan.onclick = this.itemClickHandler.bindAsEventListener(this); textMatchSpan.appendChild( document.createTextNode(textValues.mid) ); suggestionSpan.appendChild( document.createTextNode(textValues.start) ); suggestionSpan.appendChild(textMatchSpan); suggestionSpan.appendChild( document.createTextNode(textValues.end) ); return suggestionSpan; },
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date and time of the request, and the authorization header. You can see a sample header in the following listing.
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Now all unqualified class names that appear in this mapping document will be prefixed with the declared package name. We assume this setting in all mapping examples in this book. If writing XML files by hand (using the DTD for auto-completion, of course) still seems like too much work, attribute-oriented programming might be a good choice. Hibernate mapping files can be automatically generated from attributes directly embedded in the Java source code.
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The EJB 3 JPA does not require persistence providers to do any type of caching. On the other hand, one of the primary benefits of using most O/R mapping frameworks is that they provide a certain level of caching to reduce trips to the database. Some people think caching is the solution for every performance problem. The reality is that improper use of caching may lead to stale data and a whole different set of performance issues. Before jumping into using a cache, you need to understand how your vendor supports caching. In most cases, you can improve performance of your applications with the appropriate use of caching. Most persistence providers support caching either entity objects, queries, or both. Caching probably makes sense for data that is read-only or is not frequently updated (read-mostly). For example, in ActionBazaar some entities such as Category rarely change. Knowing this helps us decide that it makes sense to cache Catalog entity objects. Some queries may always result in the same data within a specific time interval. For example, a named query findFiveMostPopularItems may always return the same set of entities for a four- to five-hour interval. You may wish to cache the results of that query because almost all users of ActionBazaar would probably wish to see the most popular items. The caching types you can use with an EJB 3 JPA provider can be broken into three levels, as shown in figure 13.3.
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Second, all references to objects and arrays added to the prototype object are shared between all the instances.
Open the Quotes record store Parse out the current and historical prices from the record. Return null signifying no prices and no record Return array containing the prices Extracting the dollar prices from a record is again a matter of string manipulation and character matching. It is handled by the parsePrices(byte[] quoteRec) method which is shown in listing 6.7.
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4.3.2 Solution: Manage connections with surgical precision
Profiling or performance analysis is important for any type of computer program. But we ve gotten sloppy about profiling web pages in the last several years as bandwidth has gotten cheaper and more abundant. With the iPhone, we now need to sit up and start paying attention again. This is because of some of the unique features of the iPhone. We ve already touched several times upon the fact that an iPhone in the wild depends upon the EDGE or 3G network for downloading. This means that we have to create smaller, leaner pages. But we also always need to remember that one of the iPhone s unique features is its energy consciousness, and as a result we shouldn t be creating web pages that take more juice than they need. Solving the bandwidth problem is an easy one, because there are lots of tools available to help out, such as Safari s Network Timeline, which shows where your web page is getting slowed down. Generally, when analyzing bandwidth you should try to remember the low-bandwidth lessons of yesteryear, including the following:
There are different addPageLabel() methods in the PdfPageLabels class. They all take a page number as the first and a numbering style as the second parameter. Changing the numbering style resets the page number to 1. A method with three parameters can be used to add a String that serves as a prefix. This method can also be used in combination with the EMPTY numbering style if you want to create text-only page labels. The method with four parameters lets you define the first logical page number. In listing 13.11, when you start labeling pages with "Movies-", you can define that the first page labeled that way should be page 4.
If you look in the ChatServerLibrary project, you ll find an App.config file. You ll find one of these, or its web equivalent, web.config, in lots of different kinds of .NET applications, but an App.config in a library project is something of an anomaly application configuration files configure applications, and a library is not an application. Normally, adding an App.config file to a project that builds a DLL does nothing useful, but WCF projects are an exception because of the WCF Service Host we saw earlier. The test host loads the contents of this file into its own application configuration. Normally, application configuration files must go either into projects that build executable applications, or into web projects.
Declarative programming vs. imperative programming
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