【導(dǎo)讀】字，并嚴(yán)格執(zhí)行。個(gè)外文字符，譯出漢字不得少于3000，于第四周交給指導(dǎo)老師審閱。字以上，包括綜述、系統(tǒng)總體設(shè)計(jì)、系統(tǒng)實(shí)現(xiàn)、性能分析、結(jié)論等。生有能力而且可以獨(dú)立完成小中型項(xiàng)目的設(shè)計(jì)與開發(fā)。學(xué)?，F(xiàn)有設(shè)備和環(huán)境可以提供。給學(xué)生實(shí)習(xí)和上機(jī)，而且具有專業(yè)老師可以指導(dǎo)學(xué)生。段，提高房屋租賃機(jī)構(gòu)的管理水平和服務(wù)質(zhì)量已成為該行行業(yè)的當(dāng)務(wù)之急。市場(chǎng)參與國(guó)際市場(chǎng)競(jìng)爭(zhēng)。產(chǎn)生根本性的影響。該房屋信息發(fā)布系統(tǒng)也是基于B/S模式的電子商務(wù)的應(yīng)用。所以現(xiàn)在美國(guó)的計(jì)算機(jī)技術(shù)是世界上最先進(jìn)的國(guó)家。這也是以后的發(fā)展趨勢(shì)。不僅節(jié)約資金和產(chǎn)品的宣傳成本，更可以

　　

【正文】 4849 of the book: Clearly this is the approach to take when working with named queries and Hibernate Synchronizer. A quick test confirms that it produces the same output, and it39。s much better code. Whether or not you want to use Hibernate Synchronizer to generate its own style of data access objects, there is one last major feature to explore. Editing Mappings One of the main attractions of Hibernate Synchronizer is its specialized editor for mapping documents. This editor can be configured to automatically regenerate the associated data objects whenever you save files, but that39。s just a final touch。 you might want to use the editor even if you39。re not using the plugin39。s code generator. It gives you smart pletion of mapping document elements, and a graphical outline view in which you can manipulate them, as well. There is a trick to getting the editor to work for you, though, at least if you39。re starting from the downloaded source code from my Developer39。s Notebook. In the download, the mapping documents are named with the extension ., and the editor is only invoked for files ending with .hbm. In theory, you can configure the extension mappings within Eclipse so that both extensions use the plugin39。s mapping document editor, but I wasn39。t able to get that to work, and I saw that someone else on the support forum had the same problem. So, at least for now, your best bet may be to rename the files. (If you39。re going to stick with Antbased standard code generation, be sure to update the codegen target in to use the new extension, too.) As soon as I renamed to , its icon in the Package Explorer was updated to look like the Hibernate logo, and the default editor became the plugin39。s, as shown in Figure 23. For whatever reason, the other Hibernate Synchronizer options (as shown in Figure 17) are available with either extension, but the editor is available only with the shorter version. The editor has contextsensitive pletion support for all of the elements you39。re adding within the mapping document. Figure 24 shows a couple of examples, but no screen shots can really capture the depth and usefulness of a feature like this。 I39。d very much encourage you to install the plugin and play with it yourself for a while. You will quickly see how helpful it can be in working with mapping documents. The outline view, shown in Figure 26, gives you a graphical view of the hierarchy of classes, their mapped elements, named queries, and the like that are present in your mapping document, as well as giving you a menu offering a few wizards to help you create new ones. The contextual menu within the editor itself also offers a Format Source Code option you can use to clean up and reflow the document. There are already many neat and useful features in this editor, and it39。ll be interesting to see how it grows in the future. My only plaint (and a minor one at that) is that this editor uses a very different approach to helping you manage quotation marks when you plete XML attributes than the JDT does in Java code. Switching back and forth between them can be somewhat disorienting. (The way the JDT works takes a little getting used to itself, but once you start trusting it, it39。s almost magical.) Despite my first impression that everything flowed from the mapping document, Hibernate Synchronizer doesn39。t currently offer any support for creating or updating a database schema from your mapping documents. There has already been a request posted to the support forum about this, and it wouldn39。t surprise me if we saw these features in the future。 support shouldn39。t be too difficult. For now, you39。ll have to stick with an approach like the Antdriven one in Hibernate: A Developer39。s Notebook if you39。re developing your database from your mappings. Alternately, the Hibernator plugin described below does support schema updates from within Eclipse. I may have to investigate whether it39。s possible to have both of these plugins installed at the same time. Well, I certainly hope this whirlwind tour has given you an sense of the capabilities offered by the plugin. I haven39。t covered all of them, by any means, so do download it and explore on your own if anything has intrigued you. TradeOffs Clearly you can do some neat things with Hibernate Synchronizer. Will I be using it for my own Hibernate projects? There are some pluses and minuses to that idea, and I probably won39。t decide until I get to the point of actually adopting Hibernate in place of our homebrew (and very simplistic) lightweight O/R tool at work. That is going to be a significant enough change that we are putting it off until we tackle a major architecture shift that39。s on the horizon for other reasons. Here are some of the factors that will weigh in my decision. As mentioned in the Installation section, there is a little bit of concern about the license out there. The plugin39。s forum has a discussion about this. The current license is based on a custom modification of the GNU GPL that removes all the sourcesharing provisions, but tries to retain the other aspects of copyleft protection. There is some question about the legitimacy of this, and the author is looking for an alternative. It is clear that the intention is to protect the plugin, not to encumber any other project that happens to use the plugin to generate code, but it may be worth carefully reading the current license to see if you believe that intent has been achieved, or if there is too much risk for you. The same discussion reveals that the author had originally released the plugin as open source, but withdrew it temporarily because he felt it wasn39。t yet polished enough to serve as a good example to others. He then had some very annoying interactions with hotheads who, sadly, soured him on the whole idea of sharing the source. It is certainly hi