dwr+hibernate实现的分页技术

1、hibernate进行数据库查询，函数代码如下(这里对dwr基本的使用不做多余解说)：

函数所需类：PageController、Params、AutoQuery。（此三文件如若需要请留下邮箱或者下载地址:http://download.csdn.net/source/612569）

传入参数为查找的页码和参数map

public List select(String pages, Map fromMap) {
        Session hibernateSession = HibernateSession.faqSession(); //因为项目用到多数据库，封装了多数据库的链接方式，这块获得的为hibernate的session
        PageController customerCtrl = new PageController();//新建类PageController
        /*获得map传递进来的参数信息*/
        Article article = new Article();//初始化一个实体类
        try {
            BeanUtils.copyProperties(article, fromMap);//拷贝dwr传入的一个map，拷贝进实体
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        /** 初始化分页参数 */
        Params params = new Params();
        List result;

        params.setTotal(true);
        /***********************这块组建HQL*****************/
        if (null != article.getId() && article.getId() != 0 && article.getId() != -1) {
            params.addParam("id", article.getId(), AutoQuery.LONG);
        }
        if (null != article.getTitles() && !article.getTitles().equals("")) {
            params.addParam("titles", "%" + article.getTitles() + "%", AutoQuery.STRING, "like");
        }
        if (null != article.getUserName() && !article.getUserName().equals("")) {
            params.addParam("userName", "%" + article.getUserName() + "%", AutoQuery.STRING, "like");
        }
        if (null != article.getUserID() && article.getUserID() != 0 && article.getUserID() != -1) {
            params.addParam("userId.id", article.getUserID(), AutoQuery.LONG);
        }
        if (null != article.getCategoryName() && !article.getCategoryName().equals("")) {
            params.addParam("categoryName", "%" + article.getCategoryName() + "%", AutoQuery.STRING, "like");
        }
        if (null != article.getCategoryID() && article.getCategoryID() != 0 && article.getCategoryID() != -1) {
            params.addParam("categoryId.id", article.getCategoryID(), AutoQuery.LONG);
        }
        /****************************************/

        params.setOrderBy(" order by createDate desc ");
        params.setFrom("Article");
        params.setPageItemNo(customerCtrl.getPageSize());
        if (null == pages) {
            if (0 == customerCtrl.getCurrentPage()) {
                customerCtrl.setCurrentPage(1);
            }
        } else {
            customerCtrl.setCurrentPage(Integer.parseInt(pages));//设置当前页码
        }

        params.setPageStartNo(customerCtrl.getCurrentPage());
        customerCtrl.setParams(params);
        AutoQuery aq = new AutoQuery(params);
        aq.setSession(hibernateSession);

        result = aq.find();
        if (null == result) {
            result = new ArrayList();
        }
        log.debug("结果集大小：" + result.size());
        customerCtrl.setTotalSize(aq.getTotalSize());//获得总记录数
        customerCtrl.setTotalPages(aq.getTotalPages());//获得总页数
        log.debug("总页数大小：" + customerCtrl.getTotalPages());

        if (customerCtrl.getCurrentPage() > customerCtrl.getTotalPages()) {
            customerCtrl.setCurrentPage(customerCtrl.getTotalPages());//获得当前页码
            params.setPageStartNo(customerCtrl.getCurrentPage());

            customerCtrl.setParams(params);

            AutoQuery aqq = new AutoQuery(params);
            aqq.setSession(hibernateSession);

            result = aqq.find();
            if (null == result) {
                result = new ArrayList();
            }

            customerCtrl.setTotalPages(aqq.getTotalPages());
            customerCtrl.setTotalSize(aqq.getTotalSize());
        }
        ArrayList list = new ArrayList(2);//创建一个数组，传入list[0]为result结果集，list[1]为customerCtrl对象，这里存放了当前条件查找到的记录的条数，页数，当前页数等信息。每页的条数也是在此类配置。
        list.add(result);
        list.add(customerCtrl);
        return list;
    }

2、上面的代码实现数据库hibernate查找信息，并且对信息进行分页等，充分利用了hibernage对数据库的良好支持以及灵活性。

下面编写页面的分页处理：

当然页面上的dwr基本使用还是需要遵守的：
A、引入：
<script src='/dwr/interface/ArticleManageDwr.js'></script>
    <script src='/dwr/engine.js'></script>
    <script src='/dwr/util.js'></script>

B、jsp页面的body体：
<body οnlοad="callArticle()">
<form name="myform">
    <input type="hidden" name="id" id="id" value="0"/>
    <tr>
        <font id="biaoji">添加文章:</font>
        <td>Title:</td>
        <td><input id="titles" name="titles" type="text"/></td>
        <td>Content:</td>
        <td><input id="content" name="content" type="text"/></td>

        <td>CategoryID:</td>
        <td><select id="categoryID">
        </select>
        </td>
        <a href="#" οnclick="verdict()">提交</a>
    </tr>
</form>
<font color="red" id="error"></font>
<table width="900" border="1" id="mytable">
    <thead>
        <tr>
            <th>Title</th>
            <th>Content</th>
            <th>UserName</th>
            <th>CategoryName</th>
            <th colspan="2">Actions</th>
        </tr>
    </thead>
    <tbody id="tb"></tbody>
    <tfoot>
     <tr>
                    <td>
       <font id="zongyeshu"></font>
      </td>
                    <td>
       <input type="button" οnclick="firstPage(callArticle);" value="首页" />
      </td>
      <td>
       <input type="button" οnclick="superiorPage(callArticle)" value="上一页" />
      </td>
      <td>
       <input type="button" οnclick="nextPage(callArticle)" value="下一页" />
      </td>
      <td>
       <input type="button" οnclick="lastPage(callArticle)" value="末页" />
      </td>
                    <td>
       <input id="dangqian" maxlength="2"/>
      </td>
                </tr>
    </tfoot>
</table>
</body>

D、javascript的综合查询部分：
var map = DWRUtil.getValues("myform");
/*-------------------------------------------------查询用户列表，并且创建表格方法-------------------------------------------------*/
var getTitles = function(data) {
    return data.titles;
};
var getContent = function(data) {
    return data.content;
};
var getUser = function(data) {
    return data.userName;
};
var getCategory = function(data) {
    return data.categoryName;
};
var getEdit = function(data) {
    return document.createElement('<input type="button" value="Edit" οnclick="readPerson(' + data.id + ')"/>');
};
var getDelete = function(data) {
    return document.createElement('<input type="button" value="Delete" οnclick="del(' + data.id + ')"/>');
};
function callArticle()
{
    DWRUtil.useLoadingMessage("login......");
    ArticleManageDwr.select(page,map,callreturn); //查询文章信息回调 callreturn函数
}
function callreturn(data)
{
    DWRUtil.removeAllRows("tb");
    DWRUtil.addRows("tb", data[0], [getTitles,getContent,getUser,getCategory,getEdit,getDelete]);
    getPageController(data[1]);
    $("dangqian").value = "当前第"+page+"页";
    $("zongyeshu").innerHTML = "共计"+totalPages+"页"+totalSize+"条记录";
}

以上测试通过，可以放心使用，此代码完全基于hibernate的分页技术，相信hibernate相信dwr。

最后

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