Restrictions.like(属性名, 查询条件的值, 匹配方式)：
Restrictions.in(属性名, 查询条件的值, 匹配方式)：
Restrictions.eq(属性名, 查询条件的值, 匹配方式)：
Criteria Query常用的查询限制方法
Restrictions.eq() equal，=
Restrictions.allEq() 参数为Map对象，使用key/value进行多个等于的对比，相当于多个Restrictions.eq()的效果
Restrictions.gt() greater-than, >
Restrictions.lt() less-than, <
Restrictions.le() less-equal, <=
Restrictions.between() 对应sql的between子句
Restrictions.like() 对应SQL的like子句
Restrictions.in() 对应SQL的in子句
Restrictions.and() and关系
Restrictions.or() or关系
Restrictions.isNull() 判断属性是否为空，为空返回true，否则返回false
Restrictions.isNotNull() 与Restrictions.isNull()相反
Order.asc() 根据传入的字段进行升序排序
Order.desc() 根据传入的字段进行降序排序
MatchMode.EXACT 字符串精确匹配，相当于“like 'value'”
MatchMode.ANYWHERE 字符串在中间位置，相当于“like '%value%'”
MatchMode.START 字符串在最前面的位置，相当于“like 'value%'”
MatchMode.END 字符串在最后面的位置，相当于“like '%value'”
setFirstResult(intfirstResult)
setMaxResults(intmaxResult)
4.查询唯一对象
Empemp= (Emp)session.createCriteria(Emp.class)
.add(Restrictions.isNotNull("salary"))
.addOrder(Order.desc("salary"))
.setMaxResults(1)
.uniqueResult();
方法 说明
Query Criterialist() 返回List集合
iterate() 返回Iterator迭代器，只查询出ID值。
uniqueResult() 返回唯一对象
Criteria接口提供了createCriteria()和createAlias()方法建立内连接
List<Emp>list =session.createCriteria(Emp.class)
.add(Restrictions.ilike("empName","a",MatchMode.ANYWHERE))
.createCriteria("dept")
.add(Restrictions.eq("deptName","财务部").ignoreCase()).list();
List<Emp>list =session.createCriteria(Emp.class,"e")
.createAlias("dept","d")
.add(Restrictions.ilike("e.empName","a",
MatchMode.ANYWHERE))
.add(Restrictions.eq("d.deptName","财务部").ignoreCase()).list();List<Object[]> list = session
.createCriteria(Emp.class)
.setProjection(
Projections.projectionList()
.add(Property.forName("empName"))
.add(Property.forName("hiredate")))
.list();List<String> list = session.createCriteria(Dept.class)
.setProjection(Property.forName("deptName")).list();DetachedCriteria和Criteria功能类似，它实现了CriteriaSpecification接口
Criteria是由Session对象创建的
DetachedCriteria创建时不需要Session对象
使用DetachedCriteria来构造查询条件
可以把DetachedCriteria作为方法参数传递给业务层
DetachedCriteria detachedCriteria = DetachedCriteria
.forClass(Emp.class, "e")
.createAlias("e.dept", "d")
.add(Restrictions.eq("d.deptName", "财务部"))
.add(Restrictions.ilike("e.empName", "a",
MatchMode.ANYWHERE));
List<Emp> list = detachedCriteria.getExecutableCriteria(session)
.list();DetachedCriteria avgSalary = DetachedCriteria.forClass(Emp.class,
"e").setProjection(Property.forName("salary").avg());
List<Emp> list = session.createCriteria(Emp.class)
.add(Property.forName("salary").gt(avgSalary)).list();================Criteria分页加动态查询方法======================================
public PageInfo<Auction> select(Auction condition, int pageIndex){
DetachedCriteria dc = DetachedCriteria.forClass(Auction.class);
Criteria c = session.createCriteria(Auction.class);//建立一次查询
Criteria c1 = session.createCriteria(Auction.class);//建立一次查询
c.addOrder(Order.desc("auctionstarttime"));//添加查询条件-----------注意非空处理----------排序
c.add(Restrictions.ge("auctionstartprice",condition.getAuctionstartprice()));----------比较大小
c.add(Restrictions.ilike("auctiondesc", condition.getAuctiondesc(),MatchMode.ANYWHERE));----------模糊查询
Set<Integer> settype=new HashSet<Integer>();c.add(Restrictions.in( "movId",settype)); //--------编号在集合数组中
PageInfo<Auction> pageInfo = new PageInfo<Auction>();//实例分页方法
int count = (Integer) c1.setProjection(Projections.rowCount()).uniqueResult();//得到总条数
pageInfo.setCount(count);//设置总条数
pageInfo.setPageIndex(pageIndex);//设置当前页码
c.setMaxResults(PageInfo.PAGESIZE);//设置每次的查询数量
c.setFirstResult((pageIndex - 1) * PageInfo.PAGESIZE);//设置起始条数
List<Auction> list = c.list();
pageInfo.setPageList(list);//将查询的结果付给查询的实体类
}
===============================分页实体类======================================
public class PageInfo<T> { //利用泛型声明一个分页的实体类
public static final int PAGESIZE = 10;
private Integer count;// 总记录数
private List<T> pageList;// 当前页的记录集合
private Integer pageIndex;// 当前页号
private Integer totalPages;// 总页数
public Integer getTotalPages() {//特殊方法，通过总条数和每页的条数得到页数
this.totalPages = this.count / this.PAGESIZE;
if (this.count % this.PAGESIZE != 0)
this.totalPages++;
return this.totalPages;
}
}
===============================分页关于时间的处理======================================
---映射文件-------关于时间的处理---------------
<property name="auctionstarttime" type="java.sql.Timestamp">
<column name="AUCTIONSTARTTIME" length="11" not-null="true" />
</property>
---实体类-------关于时间的处理---------------
private Timestamp auctionstarttime;、
---数据库-------关于时间的处理---------------
AUCTIONSTARTTIME TIMESTAMP(6)
---方法内使用-------关于时间的处理---------------
======表单赋值
<label for="time">开始时间</label>
<input name="auctionStartTime" type="text" id="time" class="nwinput"/>
======提取：输入的时间按字符串转化为date,后提取毫秒数，转化为Java.sql.Timestamp
if(request.getParameter("auctionStartTime")!=null&&!"".equals(request.getParameter("auctionStartTime"))){
condition.setAuctionstarttime(new java.sql.Timestamp(Tool.strToDate(request.getParameter("auctionStartTime"), "yyyy-MM-dd HH:mm:dd").getTime()));
}
======底层
if (condition.getAuctionstarttime() != null) {
c.add(Restrictions.ge("auctionstarttime",
condition.getAuctionstarttime()));
c1.add(Restrictions.ge("auctionstarttime",
condition.getAuctionstarttime()));
}
===============================servlet的调用方法以及获得返回值======================================
int pageIndex=1;//登陆界面进入
if(request.getParameter("pageIndex")!=null){
pageIndex=new Integer(request.getParameter("pageIndex")).intValue();//
}Auction condition=new Auction();
PageInfo<Auction> auctionPageinfo = biz.find(condition,pageIndex);
request.setAttribute("auctionPageInfo", auctionPageinfo);
request.getRequestDispatcher("auctionList.jsp").forward(request, response);
===============================jsp页面======================================
---------页码显示------------------------------------------------------------------------------
<a href="javascript:goToPage(1)">首页</a>
<c:if test="${auctionPageinfo.pageIndex!=1}">
<a href="javascript:goToPage(${auctionPageinfo.pageIndex-1 })">上一页</a>
</c:if>
当前页：${auctionPageinfo.pageIndex}
<c:forEach step="1" begin="1" end="${auctionPageInfo.totalPages}" var="pageIndex">
<a href="javascript:goToPage(${pageIndex})">${pageIndex}</a>
</c:forEach>
<c:if test="${auctionPageinfo.pageIndex!=auctionPageinfo.totalPages}">
<a href="javascript:goToPage(${auctionPageinfo.pageIndex+1 })">下一页</a>
</c:if>
<a href="javascript:goToPage(${auctionPageinfo.totalPages})" >尾页</a>
------------------
<script type="text/javascript">
function goToPage(pageIndex){
document.forms[0].action=document.forms[0].action+"?pageIndex="+pageIndex;
document.forms[0].submit();
}
</script>
---------动态查询表单------------------------------------------------------------------------------
<form action="goodservlet?opr=list&ad=u" method="post">
<label for="name">名称</label>
<input name="auctionname" type="text" class="nwinput" id="name" value="${param.auctionname}"/>
<label for="names">描述</label>
<input name="auctiondesc" type="text" id="names" class="nwinput" value="${param.auctiondesc}"/>
<label for="time">开始时间</label>
<input name="auctionstarttime" type="text" id="time" class="nwinput" value="${param.auctionstarttime}"/>
<label for="end-time">结束时间</label>
<input name="auctionendtime" type="text" id="end-time" class="nwinput" value="${param.auctionendtime}"/>
<label for="price">起拍价</label>
<input name="auctionstartprice" type="text" id="price" class="nwinput" value="${param.auctionstartprice}"/>
<input name="" type="submit" value="查询" class="spbg buttombg f14 sale-buttom"/>
</form>
---------详细信息显示------------------------------------------------------------------------------
<c:forEach items="${requestScope.auctionPageInfo.pageList }" var="auction">
<ul class="rows">
<li>${auction.auctionname }</li>
<li class="list-wd">${auction.auctiondesc }</li>
<li>${auction.auctionstarttime }</li>
<li>${auction.auctionendtime }</li>
<li>${auction.auctionstartprice }</li>
<li class="borderno red">
<c:if test="${sessionScope.user.userisadmin==true }">
修改|
删除
</c:if>
<c:if test="${sessionScope.user.userisadmin==false }">
<a href="auctionDetail?auctionId=${auction.auctionid }">竞拍</a>
</c:if>
</li>
</ul>
</c:forEach>
