BlogJava-workspace-随笔分类-工程相关

一个Hibernate多条件查询的demo

Robert Su — Sun, 16 Aug 2009 03:14:00 GMT

    public List findByInstance(IInsInfo instance) {
        log.debug("finding IInsInfo instances with given IInsInfo instance");
        try {
            Criteria crit = getSession().createCriteria(instance.getClass());
            Criterion iname = null, gdfield = null, kind = null, property = null;
            Conjunction conjunction = Restrictions.conjunction();// 合取
            //
            if (instance.getIname() != null)
                if (!instance.getIname().equals(null)) {
                    iname = Restrictions.like("iname", "%"
                            + instance.getIname() + "%");
                    conjunction.add(iname);
                }
            if (instance.getGdfield() != null)
                if (!instance.getGdfield().equals("")) {
                    gdfield = Restrictions.eq("gdfield", instance.getGdfield());
                    conjunction.add(gdfield);
                }
            if (instance.getKind() != null)
                if (!instance.getKind().equals("")) {
                    kind = Restrictions.eq("kind", instance.getKind());
                    conjunction.add(kind);
                }
            if (instance.getProperty() != null)
                if (!instance.getProperty().equals("")) {
                    property = Restrictions.eq("property", instance
                            .getProperty());
                    conjunction.add(property);
                }

            crit.add(conjunction);
            return crit.list();
        } catch (RuntimeException re) {
            log.error("find by IInsInfo instance failed", re);
            throw re;
        }
    }

Robert Su 2009-08-16 11:14 发表评论

if判断条件中也要有顺序

Robert Su — Fri, 10 Apr 2009 14:03:00 GMT

List projectids= projectServiceManagementService.listProjectByUserID(userid,usertype);
    if( projectids.size()!=0 && projectids != null){
     projectLists = projectServiceManagementService.getProjectListbyIds(projectids);
    }

这段代码中会有bug，bug在于当projectids 为null的时候 projectids.size()这个地方已经报错了

所以正确的写法应该是   if(  projectids != null && projectids.size()!=0 )

Robert Su 2009-04-10 22:03 发表评论

这样的嵌套对象怎么输出？struts

Robert Su — Mon, 30 Mar 2009 18:39:00 GMT

现在action中有一个List days;

Day对象的定义
public class Day{
   private List eventMorningList;
}
Event对象定义

public class Event{
    private Integer id;
    private Integer name;
//    get set method
}

这个怎么显示输出比较好啊
打算做一个日历表那样的形式

一个周有一个列表，每天有一个list，list中是Event
我现在用freemarker，这样写好像是错误的
<#list days as pm>
    ${ pm.Event.name}

输出event name

因为在action直接拼table太麻烦了，感觉可视化效果不好，故打算采用freemarker这种标签语言
但是好像freemarker不能搞对象中对象的属性嘛
请教大家怎么搞？

谢谢大家给俺指点~

Robert Su 2009-03-31 02:39 发表评论

Invisible Web

Robert Su — Tue, 17 Mar 2009 09:19:00 GMT

http://www.freepint.com/gary/direct.htm#top

大多数搜索引擎存在着非常大的问题，很多人已经意识到这个问题了。
现在的问题是，海量的网络有一些通用搜索引擎——谷歌、百度抓取不到的“看不见的网页”
这部分网页比例是比较高的；
特别由于AJAX 以及RIA的大量应用，crawler面临挑战不小……
待续

There's a big problem with most search engines, and it's one many
people aren't even aware of. The problem is that vast expanses of the
Web are completely invisible to general purpose search engines like
AltaVista, HotBot and Google. Even worse, this "Invisible Web" is in
all likelihood growing significantly faster than the visible Web
you're familiar with.
So what is this Invisible Web and why aren't search engines indexing
it? To answer this question, it's important to first define the
"visible" Web, and describe how search engines compile their indexes.

Robert Su 2009-03-17 17:19 发表评论